S. Lammel

The general characteristics of inelastic proton-antiproton collisions at the CERN SPS Collider are studied with the UA1 detector using magnetic and calorimetric analysis. Results are presented on charged particle multiplicities and transverse and longitudinal momenta, and on total transverse energy distributions at centre of mass energies ranging from 0.2 to 0.9 TeV.

We report measurements of b-quark and B-hadron production in pp̄ collisions at √s=630 GeV. We use muon samples to extract beauty production cross-sections over a wide range of transverse momentum in the central rapidity range |y| < 1.5. We compare our results to an O(αs3) QCD prediction and find good agreement over the measured b-quark transverse momentum range 6 GeV/c to 54 GeV/c. Using the shape of the pT and y distribution predicted by QCD to extrapolate our data, we infer a total cross-section for b-quark production at √s=630GeV ofσ(pp̄→bb̄+X)=19.3±7(exp.)±9(th.μb.

We report on the first observation of the beauty baryon Λb in an exclusive decay channel at the CERN pp collider. Using 4.7 pb−1 of muon data collected in the 1988/89 collider runs we reconstruct 16±5 Λb's in the decay mode Λb→JψΛ above a background of 9±1 events, corresponding to a significance of about five standard deviations. We measure the Λb mass to be mΛb=5640±50±30 MeV/c2. Using the beauty cross-section measured by UA1 we deduce for the product of the production fraction and branching ratio fΛb Br (Λb→JψΛ)=(1.8±1.0)×10-10. Our sample contains three-muon event in which the beauty particle opposite to the Λb is tagged by the third muon. We also observe an indication of a signal in the decay channel B0→JψK0∗ with a significance of three standard deviations.

A significant intermittency signal is observed in 630 GeV pp collisions measured in the UA1 central detector. It occurs with similar magnitude in different variables: pseudorapidity, rapidity and azimuthal angle. The signal increases with decreasing charged particle multiplicity in the event. Its strength in a sample of low p⊥ tracks and its multiplicity dependence are not reproduced by commonly used Monte Carlo models of high energy interactions.

We have measured the production cross-section times branching ratio for J/ψ→μ+μ− in pp̄ interactions at √s = 630 GeV in the kinematic range |y|<2.0 and pT>5 GeV/c, BR(J/ψ→μ+μ−)σ(pp̄→J/ψ)=6.18±0.24±0.81 nb. The data sample collected in 1988 and 1989 for an integrated luminosity of 4.7 pb−1 represents a fivefold improvement over the statistics in our earlier study of the J/ψ production process, and the pT distribution which is measured extends to 28 GeV/c. Using event topology we show that the rate for the direct production of J/ψ, via radiative decays of χ states, is larger than that for production via B-hadrons. Production of ψ′ is also studied using the decay modes <ψ′→μ+μ− and ψ′→J/ψπ+ψ−.

We report on a search for the decays B0→ μ+μ−, B→ μ+ μ−X and Bd0 → μ+ μ−K0∗, which are expected to be rare if mediated by flavor changing neutral currents. Using data collected during the 1984–1989 CERN pp̄ Collider runs, the UA1 search was carried out using μ+ μ− events with 3.9<Mμμ < 5.5 GeV/c2. We find 90% confidence level upper limits on the branching for BR → μ+μ− of 8.3 × 10−6, for B → μ+μ−X of 5.0 × 10−5, and for B0d→μ+μ−K0∗ of of 2.3 × 10−5. Implicatitions for upper limits on the t-quark mass are discussed.

Bose-Einstein correlations have been measured at the SPS collider at centre-of-mass energies from √s=0.2 to 0.9 TeV. The size and the incoherence parameter of the particle emitting region have been determined as a function of charged particle density in pseudorapidity Δn/Δη, centre-of-mass energy and the direction of emission of the charged particles. For fixed values of Δn/Δη the size of the interaction region and the incoherence parameter remain constant with rising √s. At fixed √s, the size of the interaction region increases with rising charged particle density while the incoherence parameter decreases.

We present a study of low mass dimuon events [m(μμ) < 6 GeV/c2] from the UA1 experiment at the CERN pp collider. Contributions from semileptonic decays of heavy flavour particles, Drell-Yan type processes, J/ψ decays and leptonic decays of light mesons are extracted, and cross sections for high pT beauty and Drell-Yan production are derived. A limit for the branching fraction for the exotic decay B0→μ+μ− is also obtained. The cross section for section for low mass, high pT Drell-Yan prod uction is compared to the measured direct photon cross section using QED and QCD derived relationship. This relationship is used to infer a measurement of the single photon cross section at lower values of transverse momentum, where photons cannot be unambigously identified.

An analysis of W and Z boson production at UA1, using 4.66 pb−1 of data from the 1988 and 1989 CERN pp Collider runs at s=0.63 TeV, yields R≡σWBr(W→μv)/σzBr(Z→μμ)=10.4−1.5+1.8stat.±0.8(syst.) We find R=9.5−1.0+1.1(stat.+syst.) when combining all available UA1 data, in both the electron and muon channel, taken in the period 1983–1989. In the framework of the standard model, the value of R is used to infer the total width of the W boson, ΓWtot=2.18−0.24+0.26 (exp.)±0.04(theory) GeV/c2.

We report on a new measurement of B0−B0 mixing at the CERN Spp̄S collider. Mixing is measured in the non-isolated high mass dimoun sample using data from the 1988–1989 collider runs. The measured value of the mixing parameter, χ, is 0.145±0.035(stat.) ± 0.014(syst.). The average of this measurement and that from our 1984–1985 data is ξ= 0.14 ± 0.029 (stat.) ± 0.017 (syst.) assuming fully correlated errors. Using the measurement of ξd from ARGUS and CLEO , we obtain χ = 0.50 ± 0.20, which gives a limit of χs > 0.17 (0.12) at 90% (95%) CL. Including the measurements of χ from the ALEPH and L3 experiments gives χs = 0.53 ± 0.15, and a limit of χs > 0.27 (0.23) at 90% (95%) CL.

We report on a search for new heavy quarks decaying semileptonically into muons, using 4.7 pb−1 of data taken during the CERN $$p\bar p$$ collider runs in 1988 and 1989. The properties of isolated muons accompanied by jets are consistent with the predictions from the Standard Model but do not show a signal for a new heavy quark. Combining all the UA1 data (5.4 pb−1), lower mass limits are obtained at 60 GeV/c2 (95% CL) for thet-quark and 43 GeV/c2 (95% CL) for a fourth-generation charge-1/3 quark (b′-quark).

We report on measurements of correlated $$b\bar b$$ production in $$p\bar p$$ collisions at $$\sqrt s = 630GeV$$ , using dimuon data to tag both theb and $$\bar b$$ quarks. Starting from an inclusive dimuon sample we obtain improved cross-sections for single inclusive beauty production and confirm our earlier results on $$B^0 - \bar B^0$$ mixing. From a study of $$b\bar b$$ correlations we derive explicit cross-sections for semi-differential $$b\bar b$$ production. We compare the measured cross-sections and correlations to $$\mathcal{O}\left( {\alpha _s^3 } \right)$$ QCD predictions and find good quantitative agreement. From the measured angular distributions we establish a size-able contribution from higher order QCD processes with a significance of about seven standard deviations. A large nonperturbative contribution to these higher order corrections is excluded.

We present an analysis of the discovery reach for supersymmetric particles at the upgraded Tevatron collider, assuming that SUSY breaking results in universal soft breaking parameters at the grand unification scale, and that the lightest supersymmetric particle is stable and neutral. We first present a review of the literature, including the issues of unification, renormalization group evolution of the supersymmetry breaking parameters and the effect of radiative corrections on the effective low energy couplings and masses of the theory. We consider the experimental bounds coming from direct searches and those arising indirectly from precision data, cosmology and the requirement of vacuum stability. The issues of flavor and CP-violation are also addressed. The main subject of this study is to update sparticle production cross sections, make improved estimates of backgrounds, delineate the discovery reach in the supergravity framework, and examine how this might vary when assumptions about universality of soft breaking parameters are relaxed. With 30 fb$^{-1}$ luminosity and one detector, charginos and neutralinos, as well as third generation squarks, can be seen if their masses are not larger than 200-250 GeV, while first and second generation squarks and gluinos can be discovered if their masses do not significantly exceed 400 GeV. We conclude that there are important and exciting physics opportunities at the Tevatron collider, which will be significantly enhanced by continued Tevatron operation beyond the first phase of Run II.

A search for multifractal structures, in analogy with multifractal theories, is performed on UA1 minimum bias events. A downward concave multifractal spectral function,f(α) (where α is the Lipschitz-Hölder exponent), indicates that there are self-similar cascading processes, governing the evolution from the quark to the hadron level, in the final states of hadronic interactions.f(α) is an accurate measure of the bin to bin fluctuations of any observable. It is shown that the most sensitive comparison between data and the Monte Carlo models, GENCL and PYTHIA 4.8 can be made usingf(α). It is found that these models do not fully reproduce the behaviour of the data.

A search for t-quark decay into charged Higgs, t→H+b, with the charged Higgs decaying via the H+→τ+vτ mode, has been done in proton-antiproton collisions at √2 = 0.63 TeV with the UA1 experiment. No evidence for this decay das been observed. Mass limits at 95% and 90% CL for the t-quark and the charged Higgs are presented. The results have also been interpreted in terms of the tan β parameter of a two-doublet Higgs sector.

The UA1 Collaboration has recently improved its measurement of the beauty production cross-section by including explicit measurements of bb correlations. Using these data we have determined the strong coupling constant αs. The comparison of the measured cross-section for 2-body final states with O(αs3) QCD predictions yields a measurement of αs(20 GeV) = 0.145−0.010 exp −0.016 th+0.012 +0.013, corresponding to αs(Mz) = 0.113−0.006 exp −0.009 th+0.007 +0.008. This is the first theoretically well-defined measurement of αs from a purely hadronic production process. Evaluating αs from cross-sections at different Q2-values we find that the running of αs is needed for internal consistency of the UA1 data.

We have measured the rate of D∗± meson production inside the jets produced in pp collisions at √s = 630 GeV. For jets in the transverse energy range 15<ET<60 GeV we find a production rate of 0.10±0.04±0.03 D∗± per jet, which is in good agreement with perturbative QCD calculations. In addition, we find that the D∗± fragmentation distribution is strongly peaked towards low z consistent with gluon splitting as the dominant production mechanism.

Abstract The prompt reconstruction of the data recorded from the Large Hadron Collider (LHC) detectors has always been addressed by dedicated resources at the CERN Tier-0. Such workloads come in spikes due to the nature of the operation of the accelerator and in special high load occasions experiments have commissioned methods to distribute (spill-over) a fraction of the load to sites outside CERN. The present work demonstrates a new way of supporting the Tier-0 environment by provisioning resources elastically for such spilled-over workflows onto the Piz Daint Supercomputer at CSCS. This is implemented using containers, tuning the existing batch scheduler and reinforcing the scratch file system, while still using standard Grid middleware. ATLAS, CMS and CSCS have jointly run selected prompt data reconstruction on up to several thousand cores on Piz Daint into a shared environment, thereby probing the viability of the CSCS high performance computer site as on demand extension of the CERN Tier-0, which could play a role in addressing the future LHC computing challenges for the high luminosity LHC.

We present a search for the decay W±→π±γ, using data taken at the CERN proton-antiproton Collider with the UA1 detector and corresponding to an integrated luminosity of 0.7 pb−1. We do not observe a signal for such a process: hence we obtain an upper limit on the π±γ decay width of 5.8×10−2Γ (W±→e±v) (95%CL).

The Worldwide LHC Computing Grid infrastructure links about 200 participating computing centres affiliated with several partner projects. It is built by integrating heterogeneous computer and storage resources in diverse data centres all over the world and provides CPU and storage capacity to the LHC experiments to perform data processing and physics analysis. In order to be used by the experiments, these distributed resources should be well described, which implies easy service discovery and detailed description of service configuration. Currently this information is scattered over multiple generic information sources like GOCDB, OIM, BDII and experiment-specific information systems. Such a model does not allow to validate topology and configuration information easily. Moreover, information in various sources is not always consistent. Finally, the evolution of computing technologies introduces new challenges. Experiments are more and more relying on opportunistic resources, which by their nature are more dynamic and should also be well described in the WLCG information system. This contribution describes the new WLCG configuration service CRIC (Computing Resource Information Catalogue) which collects information from various information providers, performs validation and provides a consistent set of UIs and APIs to the LHC VOs for service discovery and usage configuration. The main requirements for CRIC are simplicity, agility and robustness. CRIC should be able to be quickly adapted to new types of computing resources, new information sources, and allow for new data structures to be implemented easily following the evolution of the computing models and operations of the experiments.

Storage capacity at CMS Tier-1 and Tier-2 sites reached over 100 Petabytes in 2014, and will be substantially increased during Run 2 data taking. The allocation of storage for the individual users analysis data, which is not accounted as a centrally managed storage space, will be increased to up to 40%. For comprehensive tracking and monitoring of the storage utilization across all participating sites, CMS developed a space monitoring system, which provides a central view of the geographically dispersed heterogeneous storage systems. The first prototype was deployed at pilot sites in summer 2014, and has been substantially reworked since then. In this paper we discuss the functionality and our experience of system deployment and operation on the full CMS scale.

The Collider Detector at Fermilab (CDF) collaboration records and analyses proton–anti-proton interactions with a center-of-mass energy of 2 TeV at the Tevatron. During the next collider run the experiment expects to record about 1 PetaByte of data, an increase by more than an order of magnitude in data volume compared to the existing data of the experiment. This paper gives an overview of the new data handling system. The design builds upon successful strategies used in the past but eliminates shortcomings encountered with the old system. The core of the central analysis system will be a pool of over 20 TBytes of data disks. Logically behind this disk pool will be an automated tape library with a storage capacity to hold the full 1 PByte of Run II data. Multi-processor compute systems will be located around this storage pool to provide the required analysis power of over 3000 SPECint95. Desktop systems will be integrated into the analysis system via a shared login area and user authentication. The data handling software falls into four categories: software to manage computing resources, software for the data disks and for the mass storage subsystem, software to organize and manage the meta-data information, and the I/O modules in the analysis framework for accessing data.

The Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) uses distributed grid computing to store, process, and analyse the vast quantity of scientific data recorded every year. The computing resources are grouped into sites and organized in a tiered structure. Each site provides computing and storage to the CMS computing grid. Over a hundred sites worldwide contribute with resources from hundred to well over ten thousand computing cores and storage from tens of TBytes to tens of PBytes. In such a large computing setup scheduled and unscheduled outages occur continually and are not allowed to significantly impact data handling, processing, and analysis. Unscheduled capacity and performance reductions need to be detected promptly and corrected. CMS developed a sophisticated site evaluation and monitoring system for Run 1 of the LHC based on tools of the Worldwide LHC Computing Grid. For Run 2 of the LHC the site evaluation and monitoring system is being overhauled to enable faster detection/reaction to failures and a more dynamic handling of computing resources. Enhancements to better distinguish site from central service issues and to make evaluations more transparent and informative to site support staff are planned.

The next collider run of the Fermilab Tevatron, Run II, is scheduled for autumn of 1999. Both experiments, the Collider Detector at Fermilab (CDF) and the DØ experiment are being modified to cope with the higher luminosity and shorter bunchspacing of the Tevatron. New detector components, higher event complexity, and an increased data volume require changes from the data acquisition systems up to the analysis systems. In this paper we present a summary of the computing models of the two experiments for Run II.

CDF and D0 computing needs for the next collider run (Run II) are roughly 30 times that of those used during Run I. Then, Farms of approximately 3000 total MIPS (100 UNIX workstations) processed the 100 million recorded events. Run II processing may require over 100,000 MIPS. This increase requires large and robust hardware and software systems for smooth processing. Described are the proposed Run II Farm architecture and plans to ensure its suitability.

Physikalische BlätterVolume 51, Issue 6 p. 516-517 Aus der WissenschaftOpen Access Der erfolgreiche Nachweis des Top-Quarks H. Grassman, H. Grassman FermilabSearch for more papers by this authorS. Lammel, S. Lammel FermilabSearch for more papers by this authorTh. Müller, Th. Müller UCLASearch for more papers by this author H. Grassman, H. Grassman FermilabSearch for more papers by this authorS. Lammel, S. Lammel FermilabSearch for more papers by this authorTh. Müller, Th. Müller UCLASearch for more papers by this author First published: Juni 1995 https://doi.org/10.1002/phbl.19950510613Citations: 1AboutPDF ToolsExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. References 1. F. Abe et al. (CDF-Collaboration), Phys. Rev. Lett. 74, 2626 (1995). 2. S. Abachi et al. (D0-Collaboration), Phys. Rev. Lett. 74, 2632 (1995). 3. F. Abe et al. (CDF-Collaboration), Phys. Rev. D50 (1994);. Phys. Rev. D51 (1994). 4. The LEP Collaboration and the LEP Electroweak Working Group, CERN/PPE/94-187. Citing Literature Volume51, Issue6Juni 1995Pages 516-517 ReferencesRelatedInformation

The present status of searches for the Higgs boson(s) and new phenomena is reviewed. The focus is on analyses and results from the current runs of the HERA and Tevatron experiments. The LEP experiments have released their final combined MSSM Higgs results for this conference. Also included are results from sensitivity studies of the LHC experiments and lepton flavour violating searches from the B factories, KEKB and PEP-II.

We combine the results of the CDF and D0 searches for chargino and neutralino production in Gauge-Mediated SUSY using the two-photon and missing Et channel. The data are p-pbar collisions produced at the Tevatron with sqrt(s)=1.96 TeV, with 202 pb^-1 collected at CDF and 263 pb^-1 collected at D0. The combined limit excludes a chargino mass less than 209 GeV/c^2. This result significantly extends the individual experimental limits.

Progress in particle physics has been tightly related to technological advances during the past half century. Progress in technologies has been driven in many cases by the needs of particle physics. Often, these advances have benefited fields beyond particle physics: other scientific fields, medicine, industrial development, and even found commercial applications. The particle physics and technology working group of Snowmass 2001 reviewed leading-edge technologies recently developed or in the need of development for particle physics. The group has identified key areas where technological advances are vital for progress in the field, areas of opportunities where particle physics may play a principle role in fostering progress, and areas where advances in other fields may directly benefit particle physics. The group has also surveyed the technologies specifically developed or enhanced by research in particle physics that benefit other fields and/or society at large.

The data access components of the CDF experiment Data Handling systems, together with the Data File Catalog, provide both the physicists running an analysis job and the production system running reconstruction jobs with a logical view of their input and output data, and transparent interaction with the storage management components.

We have observed bottom-charm mesons via the decay mode B{sup {plus_minus}}{sub c}{r_arrow}J/{psi}thinsp {ell}{sup {plus_minus}}{nu} in 1.8thinspthinspTeV p{ovr p} collisions using the CDF detector at the Fermilab Tevatron. A fit of background and signal contributions to the J/{psi}thinsp{ell} mass distribution yielded 20.4{sup +6.2}{sub {minus}5.5} events from B{sub c} mesons. A fit to the same distribution with background alone was rejected at the level of 4.8thinspthinspstandard deviations. We measured the B{sup +}{sub c} mass to be 6.40{plus_minus}0.39(stat){plus_minus}0.13( syst) GeV/c{sup 2} and the B{sup +}{sub c} lifetime to be 0.46{sup +0.18}{sub {minus}0.16}(stat) {plus_minus}0.03(syst)thinspps . Our measured yield (production cross section times branching ratio) for B{sup +}{sub c}{r_arrow}J/{psi}thinsp{ell}{sup +}{nu} relative to that for B{sup +}{r_arrow}J/{psi}thinspK{sup +} is 0.132{sup +0.041}{sub {minus}0.037}(stat ){plus_minus}0.031(syst){sup +0.032}{sub {minus}0.020}(lifetime) . {copyright} {ital 1998} {ital The American Physical Society }

We have searched for anomalous production of missing E{sub T}thinsp(E/ {sub T}) , jets, leptons (e,thinsp{mu},thinsp{tau}) , b quarks , or additional photons in events containing two isolated, central ({vert_bar}{eta}{vert_bar}{lt}1.0) photons with E{sub T}{gt}12 GeV . The results are consistent with standard model expectations, with the possible exception of one event that has in addition to the two photons a central electron, a high-E{sub T} electromagnetic cluster, and large E/{sub T} . We set limits using two specific supersymmetry scenarios for production of diphoton events with E/{sub T} . {copyright} {ital 1998} {ital The American Physical Society}

These lectures contain an introduction to the search for supersymmetry at hadron colliders. The Tevatron is one of high-energy physics most sophisticated tools. The high center-of-mass energy of its proton-antiproton collisions makes it an ideal place to search for physics beyond the Standard Model, such as supersymmetry. Two experiments, CDF and DØ, completed a long data taking period in summer of 1995, yielding over $100 p b^{-1}$ of proton-- antiproton interactions. The data recorded by the experiments are still being analysed. The lectures outline the strategies in the search for supersymmetry at the Tevatron and examine the major analyses in detail. Results obtained by the two experiments are included where available.

We present a measurement of the B{sup 0}{leftrightarrow}{bar B}{sup 0} oscillation frequency using a flavor tagging method based on correlations of B meson flavor with the charge of other particles produced in p{bar p} collisions at {radical}(s)=1.8 TeV. Such correlations are expected to arise from b quark hadronization and from B{sup {asterisk}{asterisk}} decays. We partially reconstruct B mesons using the semileptonic decays B{sup 0}{r_arrow}l{sup +}D{sup ({asterisk}){minus}} X and B{sup +}{r_arrow}l{sup +}{bar D}{sup 0}X. From the oscillation frequency, we obtain the mass difference between the two B{sup 0} mass eigenstates, {Delta}m{sub d}=0.471{sup +0.078}{sub {minus}0.068} (stat){plus_minus}0.034(syst ){h_bar} ps{sup {minus}1}, and measure the efficiency and purity of this flavor tagging method for both charged and neutral B mesons. {copyright} {ital 1998} {ital The American Physical Society}

We observe hadronic W decays in t{bar t}{r_arrow}W({r_arrow} {ell}{nu})+{ge}4 jet events using a 109 pb{sup {minus}1} data sample of p{ovr p} collisions at {radical}(s)=1.8 TeV collected with the Collider Detector at Fermilab. A peak in the dijet invariant mass distribution is obtained that is consistent with W decay and inconsistent with the background prediction by 3.3{sigma} . From this peak we measure the W mass to be 77.2{plus_minus}4.6(stat+syst) GeV/c{sup 2} . This result demonstrates the presence of a second W boson in t{bar t} candidates in the W({r_arrow}{ell}{nu})+{ge}4 jet channel. {copyright} {ital 1998} {ital The American Physical Society}

We present the first observation of the all hadronic decay of t{ovr t} pairs. The analysis is performed using 109 pb{sup {minus}1} of p{ovr p} collisions at {radical}(s)=1.8 TeV collected with the Collider Detector at Fermilab. We observe an excess of events with five or more jets, including one or two b jets, relative to background expectations. Based on this excess we evaluate the production cross section to be in agreement with previous results. We measure the top mass to be 186{plus_minus}10{plus_minus}12 GeV/c{sup 2 } . {copyright} {ital 1997} {ital The American Physical Society}

We have used 87 pb{sup {minus}1} of data collected with the collider detector at Fermilab to search for new particles decaying to b{ovr b} . We present model-independent upper limits on the cross section for narrow resonances which exclude the color-octet technirho in the mass interval 350{lt}M{lt}440 GeV/c{sup 2} . In addition, we exclude top-gluons, predicted in models of top-color-assisted technicolor, of width {Gamma}=0.3M in the mass range 280{lt}M{lt}670 GeV/c{sup 2} , of width {Gamma}=0.5M in the mass range 340{lt}M{lt}640 GeV/c{sup 2} , and of width {Gamma}=0.7M in the mass range 375{lt}M{lt}560 GeV/c{sup 2} . {copyright} {ital 1999} {ital The American Physical Society}

A new technique to measure the ratio of [ital b] quark fragmentation fractions in p[bar p] collisions is described. Using a 70-pb[sup [minus]1] sample of low-mass dimuon trigger data recorded with the Collider Detector at Fermilab, we identify [ital B] mesons by observing the double semileptonic decays b[r arrow]c[mu]X with c[r arrow]s[mu]X. By counting the numbers of K[sup [asterisk]](892)[sup 0], K[sup [asterisk]](892)[sup +], and [phi](1020) mesons produced in association with these muon pairs, we measure the ratio of strange to nonstrange [ital B] meson production to be f[sub s]/(f[sub u]+f[sub d])=[21.0[plus minus]3.6(stat)[sub [minus]3.0][sup +3.8](syst)][percent]. This measurement is the most precise available from hadron collisions to date. Limits on the branching fractions of semileptonic charm meson decays with K[sub 1](1270), K[sub 1][sup [asterisk]](1410), and K[sub 2][sup [asterisk]](1430) mesons in the final state are also obtained. [copyright] [ital 1999] [ital The American Physical Society]

We report a measurement of the fraction of dijet events with a rapidity gap between jets produced by color-singlet exchange in {ovr p}p collisions at {radical} (s) =630 GeV at the Fermilab Tevatron. In events with two jets of transverse energy E{sup jet}{sub T}{gt}8 GeV , pseudorapidity in the range 1.8{lt}{vert_bar}{eta}{sup jet}{vert_bar}{lt}3.5 and {eta}{sub 1}{eta}{sub 2}{lt}0 , the color-singlet exchange fraction is found to be R=[2.7{plus_minus}0.7(stat){plus_minus}0 .6(syst)]{percent} . Comparisons are made with results obtained at {radical} (s) =1800 GeV and with theoretical expectations. {copyright} {ital 1998} {ital The American Physical Society }

We present a measurement of the differential cross section d{sigma}/d{summation}E{sup jet}{sub T} for the production of multijet events in p{ovr p} collisions where the sum is over all jets with transverse energy E{sup jet}{sub T}{gt}E{sup min}{sub T} . The measured cross section for events with {summation}E{sup jet}{sub T}{gt} 320 GeV is compared to O({alpha}{sup 3}{sub s}) perturbative QCD predictions and QCD parton shower Monte Carlo predictions. The agreement between the O({alpha}{sup 3}{sub s}) predicted and observed event rates is reasonable for E{sup min}{sub T}=100 GeV , but poorer for E{sup min}{sub T}=20 GeV . {copyright} {ital 1998} {ital The American Physical Society}

We search for new long-lived particles which decay to Z{sup 0} bosons by looking for Z{sup 0}{r_arrow}e{sup +}e{sup {minus}} decays with displaced vertices. We find no evidence for parent particles of the Z{sup 0} with long lifetimes in 90thinsppb{sup {minus}1} of data from the CDF experiment at Fermilab. We set a cross section limit as a function of the lifetime of the parent particle for both a generic Z{sup 0} parent and a fourth-generation, charge {minus} (1) /(3) quark that decays into Z{sup 0}b. {copyright} {ital 1998} {ital The American Physical Society}

A search for B{sup 0}{sub s}-{ovr B}{sup 0}{sub s} oscillations is performed in a sample of B{sup 0}{sub s} semileptonic decays collected using dilepton triggers at the Tevatron Collider during 1992{endash}1995. The B{sup 0}{sub s} is reconstructed using {phi} meson-lepton correlations; its initial production flavor is determined with the second lepton in the event. From a signal of 1068 with a B{sup 0}{sub s} purity of 61{percent} , we obtain a limit on the B{sup 0}{sub s}-{ovr B}{sup 0}{sub s} oscillation frequency of {Delta}m{sub s}{gt}5.8 ps{sup {minus}1} at 95{percent} confidence level. {copyright} {ital 1999} {ital The American Physical Society}

We present a study of J/{psi} and {psi}(2S) production in p{bar p} collisions, at {radical}(s)=1.8 TeV with the CDF detector at Fermilab. The J/{psi} and {psi}(2S) mesons are reconstructed using their {mu}{sup +}{mu}{sup {minus}} decay modes. We have measured the inclusive production cross section for both mesons as a function of their transverse momentum in the central region, {vert_bar}{eta}{vert_bar}{lt}0.6 . We also measure the fraction of these events originating from b hadrons. We thus extract individual cross sections for J/{psi} and {psi}(2S) mesons from b -quark decays and prompt production. We find a large excess (approximately a factor of 50) of direct {psi}(2S) production compared with predictions from the color singlet model. {copyright} {ital 1997} {ital The American Physical Society}

A strong signal for double parton (DP) scattering is observed in a 16pb{sup {minus}1} sample of {bar p}p{r_arrow}{gamma}/{pi}{sup 0}+3jets+X data from the CDF experiment at the Fermilab Tevatron. In DP events, two separate hard scatterings take place in a single {bar p}p collision. We isolate a large sample of data ({approximately}14000 events) of which 53{percent} are found to be DP. The process-independent parameter of double parton scattering, {sigma}{sub eff}, is obtained without reference to theoretical calculations by comparing observed DP events to events with hard scatterings in separate {bar p}p collisions. The result {sigma}{sub eff}=(14.5{plus_minus}1.7{sub {minus}2.3}{sup +1.7})mb represents a significant improvement over previous measurements, and is used to constrain simple models of parton spatial density. The Feynman x dependence of {sigma}{sub eff} is investigated and none is apparent. Further, no evidence is found for kinematic correlations between the two scatterings in DP events. {copyright} {ital 1997} {ital The American Physical Society}

We report the observations of the decays B{sup +}{r_arrow}{psi}(2S)K{sup +} and B{sup 0}{r_arrow}{psi}(2S)K{sup {asterisk}}(892){sup 0} in p{bar p} collisions at a center-of-mass energy of 1.8 TeV using a 110thinsppb{sup {minus}1} data sample recorded by the Collider Detector at Fermilab. We also reconstruct the decays B{sup +}{r_arrow}J/{psi}K{sup +} and B{sup 0}{r_arrow}J/{psi}K{sup {asterisk}}(892){sup 0} and measure the six ratios of branching fractions of these four decays. The relative branching-fraction results are shown to be consistent with phenomenological factorization calculations of hadronic B-meson decays. We use the world-average branching fraction B(B{sup +}{r_arrow}J/{psi}K{sup +}) to derive B{bold (}B{sup +}{r_arrow}{psi}(2S)K{sup +}{bold )}=(0.56{plus_minus}0.08{plus_minus}0.10){times}10{sup {minus}3}, B{bold (}B{sup 0}{r_arrow}{psi}(2S)K{sup {asterisk}}(892){sup 0}{bold )}=(0.92{plus_minus}0.20{plus_minus}0.16){times}10{sup {minus}3}, and B{bold (}B{sup 0}{r_arrow}J/{psi}K{sup {asterisk}}(892){sup 0}{bold )}=(1.78{plus_minus}0.14{plus_minus}0.29){times}10{sup {minus}3}, where the first and second uncertainties are statistical and systematic, respectively. {copyright} {ital 1998} {ital The American Physical Society}

We present a measurement of the time-dependent asymmetry in the rate for {ovr B}{sup thinsp0}{sub d} versus B{sup 0}{sub d} decays to J/{psi}K{sup 0}{sub S} . A nonzero asymmetry would be an indication of CP violation, and within the standard model this may be used to measure the CP -violation parameter sin(2{beta}) . A total of 198{plus_minus}17 B{sup 0}{sub d}/{ovr B}{sup thinsp0}{sub d} decays were observed in p{ovr p} collisions at {radical} (s) =1.8 TeV by the CDF detector at the Fermilab Tevatron. B{sup 0}{sub d} and {ovr B}{sup thinsp0}{sub d} are distinguished by a technique based on charge correlations from hadronization of the b quark. Our analysis results in sin(2{beta})=1.8{plus_minus}1.1(stat ){plus_minus}0.3(syst) . {copyright} {ital 1998} {ital The American Physical Society }

The lifetimes of the B{sup {minus}} and {bar B}{sup 0} mesons are measured using the partially reconstructed semileptonic decays {bar B}{r_arrow}Dl{sup {minus}}{bar {nu}}X, where D is either a D{sup 0} or D{sup {asterisk}+} meson. The data were collected by the CDF detector at the Fermilab Tevatron collider during 1992{endash}1995 and correspond to about 110thinsppb{sup {minus}1} of {bar p}p collisions at {radical} (s) =1.8thinspTeV. We measure decay lengths and extract the lifetimes to be {tau}(B{sup {minus}})=1.637{plus_minus}0.058{sub {minus}0.043}{sup +0.045} ps and {tau}({bar B}{sup 0})=1.474{plus_minus}0.039{sub {minus}0.051}{sup +0.052}thinspps, and the ratio of the lifetimes to be {tau}(B{sup {minus}})/{tau}({bar B}{sup 0})=1.110{plus_minus}0.056{sub {minus}0.030}{sup +0.033}, where the first uncertainties are statistical and the second are systematic. {copyright} {ital 1998} {ital The American Physical Society}

We present results of a search for W{sup +}W{sup -} production through the leptonic decay channel W{sup +}W{sup -}{r_arrow}l{sup +}l{sup -}{nu}{ovr {nu}} in {ovr p}p collisions at {radical}(s)=1.8TeV. In a 108pb{sup -1} data sample recorded with the Collider Detector at Fermilab, five W{sup +}W{sup -} candidates are found with an expected standard model background of 1.2{plus_minus}0.3 events. The W{sup +}W{sup -} production cross section is measured to be {sigma}({ovr p}p{r_arrow} W{sup +}W{sup -})=10.2{sup +6.3}{sub -5.1}(stat){plus_minus}1.6(syst)pb, in agreement with the standard model prediction. Limits on WW{gamma} and WWZ anomalous couplings are presented. {copyright} {ital 1997} {ital The American Physical Society}

We search for the rare decay W{sup {plus_minus}}{r_arrow}D{sub s}{sup {plus_minus}}{gamma} in 82thinsppb{sup {minus}1} of p{bar p} collisions recorded with the Collider Detector at Fermilab. At the 95{percent} confidence level, we find an upper limit on the relative branching fraction to be {Gamma}(W{sup {plus_minus}}{r_arrow}D{sub s}{sup {plus_minus}}{gamma})/{Gamma}(W{sup {plus_minus}}{r_arrow}e{sup {plus_minus}}{nu}){lt}1.2{times}10{sup {minus}2}. {copyright} {ital 1998} {ital The American Physical Society}

We report the results of a search for technicolor using 110 pb{sup {minus}1} of p{ovr p} collisions recorded by the Collider Detector at Fermilab (CDF). In technicolor models containing a technifamily, color-octet technirhos enhance the pair production of color-triplet technipions, which behave as third-generation leptoquarks. From our previously reported search for third-generation leptoquarks, we present constraints on the production of color-triplet technipions and color-octet technirhos as a function of their masses. {copyright} {ital 1999} {ital The American Physical Society}

The next collider run of the Fermilab Tevatron, Run II, is scheduled for autumn of 1999. Both experiments, the Collider Detector at Fermilab (CDF) and the D0 experiment are being modified to cope with the higher luminosity and shorter bunch spacing of the Tevatron. New detector components, higher event complexity, and an increased data volume require changes from the data acquisition systems up to the analysis systems. In this paper we present a summary of the computing models of the two experiments for Run II.

We present measurements of correlated b{bar b} cross sections, {mu}-{mu} correlations, the average B{sup 0}{bar B}{sup 0} mixing parameter {bar {chi}}, and a limit on the {ital CP}-violating parameter {epsilon}{sub B}. For these measurements, we use muon pairs from b{bar b} double semileptonic decays. The data used in this analysis were taken with the Collider Detector at Fermilab and represent an integrated luminosity of 17.4{plus_minus}0.6 pb{sup {minus}1}. The results concerning b{bar b} production correlations are compared to predictions of next-to-leading order QCD computations. {copyright} {ital 1997} {ital The American Physical Society}

We have searched for heavy neutral gauge bosons (Z{sup {prime}}) in dielectron and dimuon decay modes using 110 pb{sup {minus}1} of {ital {bar p}}{ital p} collisions at {radical}(s)=1.8 TeV collected with the Collider Detector at Fermilab. We present a limit on the production cross section times branching ratio of a Z{sup {prime}} boson decaying into dileptons as a function of Z{sup {prime}} mass. For mass M{sub Z{sup {prime}}}{gt}600 GeV /c{sup 2}, the upper limit is 40fb at 95% confidence level. We set the lower mass limits of 690, 590, 620, 595, 565, 630, and 600 GeV/c{sup 2} for Z{sup {prime}}{sub SM}, Z{sub {psi}}, Z{sub {eta}}, Z{sub {chi}}, Z{sub I}, Z{sub LR}, and Z{sub ALRM}, respectively. {copyright} {ital 1997} {ital The American Physical Society}

We have searched for the rare decay W{sup {plus_minus}}{r_arrow}{pi}{sup {plus_minus}}+{gamma} in 83 pb{sup {minus}1} of data taken in proton-antiproton collisions at {radical}(s) =1.8 TeV with the Collider Detector at Fermilab. We find three events in the signal region and estimate the background to be 5.2{plus_minus}1.5 events. We set a 95{percent} confidence level upper limit of 7{times}10{sup {minus}4} on the ratio of partial widths, {Gamma}(W{sup {plus_minus}}{r_arrow}{pi}{sup {plus_minus}}+{gamma})/{Gamma}(W{sup {plus_minus}}{r_arrow}e{sup {plus_minus}}+{nu}). {copyright} {ital 1998} {ital The American Physical Society}

The decay {Lambda}{sub b}{sup 0}{r_arrow}J/{psi}{Lambda} is observed in 110 pb{sup {minus}1} of p{bar p} collisions taken at {radical}(s)=1.8 TeV. These data are used to measure a {Lambda}{sub b}{sup 0} mass of 5621{plus_minus}4(stat){plus_minus}3(syst) MeV/c{sup 2}, and a mass difference between the {Lambda}{sub b}{sup 0} and the B{sup 0} of 340{plus_minus}5(stat){plus_minus}1(syst) MeV/c{sup 2}. The production cross-section times branching fraction for the decay {Lambda}{sub b}{sup 0}{r_arrow}J/{psi}{Lambda} relative to that for the decay B{sup 0}{r_arrow}J/{psi}K{sub S}{sup 0} has been measured to be 0.27{plus_minus}0.12(stat){plus_minus}0.05(syst). {copyright} {ital 1997} {ital The American Physical Society}

We present a measurement of Z{sup 0} boson and Drell-Yan production cross sections in {bar p}p collisions at {radical} (s) =1.8 TeV using a sample of 107 pb{sup {minus}1} accumulated by the Collider Detector at Fermilab. The Drell-Yan cross section is measured in the mass range of M{sub {mu}{mu}}{gt}40 GeV/c{sup 2}. We compare the measurements with the predictions of quantum chromodynamics in both leading order and next-to-leading order, incorporating the recent parton distribution functions. The measurements are consistent with the standard model expectations. {copyright} {ital 1999} {ital The American Physical Society}

We present a search for dilepton events from t{bar t} production with one electron or muon and one hadronically decaying {tau} lepton from the decay t{bar t}{r_arrow}(scr(l){nu}{sub scr(l)}) ({tau}{nu}{sub {tau}}) b{bar b}, (scr(l)=e,{mu}) , using the Collider Detector at Fermilab. In a 109 pb{sup {minus}1} data sample of p{bar p} collisions at {radical}(s)=1.8 TeV we expect {approximately}1 signal event and a total background of {approximately}2 events; we observe 4 candidate events (2 e{tau} and 2 {mu}{tau} ). Three of these events have jets identified as b candidates, compared to an estimated background of 0.28{plus_minus}0.02 events. {copyright} {ital 1997} {ital The American Physical Society}

We present a measurement of the mass difference [Delta]m[sub d] for the B[sup 0] meson and the statistical power of the [ital b] flavor tagging methods used. The measurement uses 90 pb[sup [minus]1] of data from p[bar p] collisions at [radical] (s) =1.8 TeV collected with the CDF detector. An inclusive lepton trigger is used to collect a large sample of [ital B] hadron semileptonic decays. The mass difference [Delta]m[sub d] is determined from the proper time dependence of the fraction of [ital B] hadrons that undergo flavor oscillations. The flavor at decay is inferred from the charge of the lepton from semileptonic [ital B] decay. The initial flavor is inferred by determining the flavor of the other [ital B] hadron produced in the collision, either from its semileptonic decay (soft-lepton tag) or from its jet charge. The measurement yields [Delta]m[sub d]=(0.500[plus minus]0.052[plus minus]0.043)[h bar] ps[sup [minus]1], where the first uncertainty is statistical and the second uncertainty is systematic. The statistical powers ([epsilon]D[sup 2]) of the soft-lepton and jet-charge flavor taggers are (0.91[plus minus]0.10[plus minus]0.11)[percent] and (0.78[plus minus]0.12[plus minus]0.08)[percent], respectively. [copyright] [ital 1999] [ital The American Physical Society]

We search for new particles that decay into b{ovr b} and are produced with W bosons in p{ovr p} collisions at {radical}(s)=1.8 TeV . The search uses 109{plus_minus}7 pb{sup {minus}1} accumulated by the CDF experiment at Fermilab. We select events with an e{nu} or {mu}{nu} , and two jets, one of them b tagged. The number of events and the two-jet mass distribution are consistent with expectations. Using W+Higgs production as a model for the acceptance, we set an upper limit on the production cross section times branching ratio for the new particle ranging from 14 to 19pb (95{percent} C.L.) as the particle mass varies from 70 to 120 GeV/c{sup 2} . {copyright} {ital 1997} {ital The American Physical Society}

B{sub d}{sup 0}-{bar B}{sub d}{sup 0} oscillations are observed in {open_quotes}self-tagged{close_quotes} samples of partially reconstructed B mesons decaying into a lepton and a charmed meson collected in p{bar p} collisions at {radical} (s) =1.8thinspTeV. A flavor tagging technique is employed which relies upon the correlation between the flavor of B mesons and the charge of a nearby particle. We measure the flavor oscillation frequency to be {Delta}m{sub d}=0.471{sub {minus}0.068}{sup +0.078}{plus_minus}0.034thinspps{sup {minus}1}. The tagging method is also demonstrated in exclusive samples of B{sub u}{sup +}{r_arrow}J/{psi}K{sup +} and B{sub d}{sup 0}{r_arrow}J/{psi}K{sup {asterisk}0}(892), where similar flavor-charge correlations are observed. The tagging characteristics of the various samples are compared with each other, and with Monte Carlo simulations. {copyright} {ital 1998} {ital The American Physical Society}

These lectures contain an introduction to the search for supersymmetry at hadron colliders. The Tevatron is one of high-energy physics most sophisticated tools. The high center-of-mass energy of its proton-antiproton collisions makes it an ideal place to search for physics beyond the Standard Model, such as supersymmetry. Two experiments, CDF and D\O, completed a long data taking period in summer of 1995, yielding over $100 p b^{-1}$ of proton-- antiproton interactions. The data recorded by the experiments are still being analysed. The lectures outline the strategies in the search for supersymmetry at the Tevatron and examine the major analyses in detail. Results obtained by the two experiments are included where available.

The lifetime of the B{sub S}{sup 0} meson is measured using the semileptonic decay B{sub S}{sup 0}{r_arrow}D{sub S}{sup {minus}}l{sup +}{nu}X. The data sample consists of about 110 pb{sup {minus}1} of p{bar p} collisions at {radical} (s) =1.8 TeV collected by the CDF detector at Fermilab. Four different D{sub S}{sup {minus}} decay modes are reconstructed resulting in approximately 600 D{sub S}{sup {minus}}l{sup +} signal events. The B{sub S}{sup 0} meson lifetime is determined to be {tau}(B{sub S}{sup 0})=(1.36{plus_minus}0.09{sub {minus}0.05}{sup +0.06}) ps, where the first and second uncertainties are statistical and systematic, respectively. The B{sub S}{sup 0} meson decay length distribution is examined for a lifetime difference {Delta}{Gamma}/{Gamma} between the two mass eigenstates of the B{sub S}{sup 0} meson. An upper limit of {Delta}{Gamma}/{Gamma}{lt}0.83 is set at the 95{percent} confidence level. {copyright} {ital 1999} {ital The American Physical Society}

We present a measurement of the mass difference {Delta}m{sub d} of the two B{sub d}{sup 0} mass eigenstates. We use a flavor tagging method based on the lepton charge, in a sample of events with two muons at low transverse momentum. The sample corresponds to an integrated luminosity of 90 pb{sup {minus}1} collected by the Collider Detector at Fermilab. The result obtained is {Delta}m{sub d}=0.503{plus_minus}0.064(stat){plus_minus}0.071(syst) ps{sup {minus}1}. thinsp {copyright} {ital 1999} {ital The American Physical Society}

We present a measurement of the t{bar t} production cross section in p{bar p} collisions at {radical}(s)=1.8 TeV using an integrated luminosity of 109 pb{sup {minus}1} collected with the Collider Detector at Fermilab. The measurement uses t{bar t} decays into final states which contain one or two high transverse momentum leptons and multiple jets, and final states which contain only jets. Using acceptances appropriate for a top quark mass of 175 GeV/c{sup 2} , we find {sigma}{sub t{bar t}}=7.6{sup +1 .8}{sub {minus}1.5} pb . {copyright} {ital 1998} {ital The American Physical Society}

We search for the flavor-changing neutral current decays of the top quark t{r_arrow}q{gamma} and t{r_arrow}qZ (here q represents the c and u quarks) in {bar p}p collisions at {radical}(s)=1.8 TeV . We use a dataset ({integral}Ldt{approximately}110 pb{sup {minus}1}) collected during the 1992{endash}1995 run of the Collider Detector at Fermilab. We set 95{percent} confidence level limits on the branching fractions B(t{r_arrow}q{gamma}){lt}3.2{percent} and B(t{r_arrow}qZ){lt}33{percent} , consistent with the standard model. {copyright} {ital 1998} {ital The American Physical Society}

We present the first measurement of the jet pseudorapidity distribution in direct photon events from a sample of p{bar p} collisions at {radical} (s) =1.8TeV, recorded with the Collider Detector at Fermilab. Quantum chromodynamics (QCD) predicts that these events are primarily from hard quark-gluon Compton scattering, qg{r_arrow}q{gamma}, with the final state quark producing the jet of hadrons. The jet pseudorapidity distribution in this model is sensitive to parton momentum fractions between 0.015 and 0.15. We find that the shape of the measured pseudorapidity distribution agrees well with next-to-leading order QCD calculations. {copyright} {ital 1997} {ital The American Physical Society}

We present a study of events with W bosons and hadronic jets produced in {bar p}p collisions at a center of mass energy of 1.8TeV. The data consist of 51400 W{sup {plus_minus}}{r_arrow}e{sup {plus_minus}}{nu} decay candidates from 108 pb{sup {minus}1} of integrated luminosity collected using the CDF detector at the Fermilab Tevatron Collider. Cross sections and jet production properties have been measured for W+{ge}1 to {ge}4 jet events. The data are compared to predictions of leading-order QCD matrix element calculations with added gluon radiation and simulated parton fragmentation. {copyright} {ital 1997} {ital The American Physical Society}

We present a search for the flavor-changing neutral current decays B{sub d}{sup 0}{r_arrow}{mu}{sup +}{mu}{sup {minus}} and B{sub s}{sup 0}{r_arrow}{mu}{sup +}{mu}{sup {minus}} in p{bar p} collisions at {radical} (s) =1.8TeV, using 98pb{sup {minus}1} of data collected at the Collider Detector at Fermilab. We find one candidate event for these decays, which is consistent with the background estimates, and set upper limits on the branching fractions of B(B{sub d}{sup 0}{r_arrow}{mu}{sup +}{mu}{sup {minus}}){lt}8.6{times}10{sup {minus}7} and B(B{sub s}{sup 0}{r_arrow}{mu}{sup +}{mu}{sup {minus}}){lt}2.6{times}10{sup {minus}6} at 95{percent} confidence level. {copyright} {ital 1998} {ital The American Physical Society}

We have searched for the decays B{sup 0}{sub s}{r_arrow}e{sup {plus_minus}}{mu}{sup {minus_plus}} and B{sup 0}{sub d}{r_arrow}e{sup {plus_minus}}{mu}{sup {minus_plus}} using a 102 pb{sup {minus}1} data sample of p{ovr p} collisions at {radical} (s) =1.8 TeV collected with the Collider Detector at Fermilab. We set upper limits on the branching fractions of B(B{sup 0}{sub s}{r_arrow}e{sup {plus_minus} }{mu}{sup {minus_plus}}){lt}6.1(8.2) {times}10{sup {minus}6} and B(B{sup 0}{sub d}{r_arrow}e{sup {plus_minus} }{mu}{sup {minus_plus}}){lt}3.5(4.5) {times}10{sup {minus}6} at 90(95){percent} confidence level. Using these limits, we set lower bounds on the corresponding Pati-Salam leptoquark masses and find that M{sub LQ}(B{sup 0}{sub s}) {gt}20.7(19.3) TeV /c{sup 2} and M{sub LQ}(B{sup 0}{sub d}) {gt}21.7(20.4) TeV /c{sup 2} at 90(95){percent} confidence level. {copyright} {ital 1998} {ital The American Physical Society }

A new generation of experiments in high energy physics is approaching. With the approval of the LHC at CERN and the revised Main Injector project at Fermilab, high statistics experiments will start operation within 5 to 10 years. With luminosities Up to 10{sup 34}/cm{sup 2}/sec and several hundred thousand readout channels, data most likely cannot be handled and analysed using traditional HEP approaches. The CAP group at Fermilab is investigating different approaches to data handling and organization for post-reconstruction analysis. We discuss the approaches considered, their strengths and weaknesses, integration with hierarchical storage, and sharing of primary data resources.

A new generation of experiments in high energy physics is approaching. With the approval of the LHC at CERN and the revised Main Injector project at Fermilab, high statistics experiments will start operation within 5 to 10 years. With luminosities Up to 10{sup 34}/cm{sup 2}/sec and several hundred thousand readout channels, data most likely cannot be handled and analysed using traditional HEP approaches. The CAP group at Fermilab is investigating different approaches to data handling and organization for post-reconstruction analysis. We discuss the approaches considered, their strengths and weaknesses, integration with hierarchical storage, and sharing of primary data resources.