Jean-Louis Faure

The s dependence of the electromagnetic proton form factors in the time-like region has been determined from the threshold (s = 4Mp2) up to s = 4.2 GeV2. Data were collected in a dedicated experiment performed at the LEAR antiproton ring at CERN, increasing by one order of magnitude the available statistics. Total and differential cross section of the pp → e−e+ reaction have been measured. The electric and magnetic form factors are found to have comparable value. The observed form factor shows a clear steep s dependence close to the threshold.

The result of a search at the LHC for heavy stable charged particles produced in pp collisions at $ \sqrt {s} = 7\;{\text{TeV}} $ is described. The data sample was collected with the CMS detector and corresponds to an integrated luminosity of 3.1 pb−1. Momentum and ionization-energy-loss measurements in the inner tracker detector are used to identify tracks compatible with heavy slow-moving particles. Additionally, tracks passing muon identification requirements are also analyzed for the same signature. In each case, no candidate passes the selection, with an expected background of less than 0.1 events. A lower limit at the 95% confidence level on the mass of a stable gluino is set at 398GeV/c 2, using a conventional model of nuclear interactions that allows charged hadrons containing this particle to reach the muon detectors. A lower limit of 311 GeV/c 2 is also set for a stable gluino in a conservative scenario of complete charge suppression, where any hadron containing this particle becomes neutral before reaching the muon detectors.

Hadronic event shapes have been measured in proton-proton collisions at sqrt(s)=7 TeV, with a data sample collected with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 3.2 inverse picobarns. Event-shape distributions, corrected for detector response, are compared with five models of QCD multijet production.

The amplitude of the signal collected from the PbWO4 crystals of the CMS electromagnetic calorimeter is reconstructed by a digital filtering technique. The amplitude reconstruction has been studied with test beam data recorded from a fully equipped barrel supermodule. Issues specific to data taken in the test beam are investigated, and the implementation of the method for CMS data taking is discussed.

The rate of the reaction p̄p→e+e− has been measured in liquid hydrogen for antiprotons at momentum values between 150 and 300 MeV/c. New precise values of the proton electromagnetic form factor in the time-like region have been obtained assuming |Ge|=|Gm| in the investigated region. The q2 dependence of the form factor close to threshold is found to have a steeper slope than indicated by existing calculations based on vector dominance models.

Other| May 01, 1989 Deformation of tilted blocks, consequences on block geometry and extension measurements J. L. Faure; J. L. Faure Author Univ. Sci. Tech. Languedoc, Montpellier, France Search for other works by this author on: GSW Google Scholar J. C. Chermette J. C. Chermette Author Search for other works by this author on: GSW Google Scholar Author and Article Information J. L. Faure Author Univ. Sci. Tech. Languedoc, Montpellier, France J. C. Chermette Author Publisher: Société Géologique de France First Online: 03 Mar 2017 Online Issn: 1777-5817 Print Issn: 0037-9409 GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique, Vandoeuvre-les-Nancy, France Bulletin de la Société Géologique de France (1989) V (3): 461–476. https://doi.org/10.2113/gssgfbull.V.3.461 Article history First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation J. L. Faure, J. C. Chermette; Deformation of tilted blocks, consequences on block geometry and extension measurements. Bulletin de la Société Géologique de France 1989;; V (3): 461–476. doi: https://doi.org/10.2113/gssgfbull.V.3.461 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin de la Société Géologique de France Search Advanced Search This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

Performance tests of some aspects of the CMS ECAL were carried out on modules of the "barrel" sub-system in 2002 and 2003. A brief test with high energy electron beams was made in late 2003 to validate prototypes of the new Very Front End electronics. The final versions of the monitoring and cooling systems, and of the high and low voltage regulation were used in these tests. The results are consistent with the performance targets including those for noise and overall energy resolution, required to fulfil the physics programme of CMS at the LHC.

Calibration of the relative response of the individual channels of the barrel electromagnetic calorimeter of the CMS detector was accomplished, before installation, with cosmic ray muons and test beams. One fourth of the calorimeter was exposed to a beam of high energy electrons and the relative calibration of the channels, the intercalibration, was found to be reproducible to a precision of about 0.3%. Additionally, data were collected with cosmic rays for the entire ECAL barrel during the commissioning phase. By comparing the intercalibration constants obtained with the electron beam data with those from the cosmic ray data, it is demonstrated that the latter provide an intercalibration precision of 1.5% over most of the barrel ECAL. The best intercalibration precision is expected to come from the analysis of events collected in situ during the LHC operation. Using data collected with both electrons and pion beams, several aspects of the intercalibration procedures based on electrons or neutral pions were investigated.

The CP violation parameter η+− is determined through the eigentime-dependent asymmetry in the rates of initially tagged K0 and K0 decaying to π+π−. The obtained values are |η+−| = (2.312 ± 0.043stat. ± 0.030syst. ± 0.011τs) × 10−3 and Φ+− = 42.7° ± 0.9stat.° ± 0.6syst.° ± 0.9Δm° with Δ = (527.4 ± 2.9) × 107h̵gs−1 measured in the same experiment using the semileptonic decay channel.

The s dependence of the proton form factor in the time-like region has been determined up to s=4.2 GeV2, assuming the validity of the |Ge| = |Gm| = |G| hypothesis. Data were taken in a dedicated experiment performed at the LEAR antiproton ring at CERN, increasing by one order of magnitude the available statistics on the proton form factor near threshold in the time-like region. Our result consist of cross section measurements of thepp→e+e− reaction for different beam momenta in the kinematical r 3.6⩽s⩽4.2 GeV2. The observed s dependence of the form factor close to threshold differs appreciably from the one suggested by previous experiments.

Ensuring the radiation hardness of PbWO4 crystals was one of the main priorities during the construction of the electromagnetic calorimeter of the CMS experiment at CERN. The production on an industrial scale of radiation hard crystals and their certification over a period of several years represented a difficult challenge both for CMS and for the crystal suppliers. The present article reviews the related scientific and technological problems encountered.

We present a new measurement of the KL-KS mass difference (Δm) using semileptonic decays of neutral kaons. The measurement yields Δm = (0.5274 ± 0.0029stat. ± 0.0005syst.) × 1010ħ/s.

The ratio of the branching fractions for pp→K+K− and pp→π+π− was determined with the CPLEAR detector, by stopping antiprotons in a gaseous hydrogen target at 15 bar pressure. It was found to be BR(K+K−)/BR(π+π−)=0.205± 0.016. The fraction of P-wave annihilation at rest at this target density was deduced to be (38±9)%.

The performance of electromagnetic calorimeter modules made of proton-irradiated PbWO4 crystals has been studied in beam tests. The modules, similar to those used in the Endcaps of the CMS electromagnetic calorimeter (ECAL), were formed from 5×5 matrices of PbWO4 crystals, which had previously been exposed to 24 GeV protons up to integrated fluences between 2.1× 1013 and 1.3× 1014 cm−2. These correspond to the predicted charged-hadron fluences in the ECAL Endcaps at pseudorapidity η = 2.6 after about 500 fb−1 and 3000 fb−1 respectively, corresponding to the end of the LHC and High Luminosity LHC operation periods. The irradiated crystals have a lower light transmission for wavelengths corresponding to the scintillation light, and a correspondingly reduced light output. A comparison with four crystals irradiated in situ in CMS showed no significant rate dependence of hadron-induced damage. A degradation of the energy resolution and a non-linear response to electron showers are observed in damaged crystals. Direct measurements of the light output from the crystals show the amplitude decreasing and pulse becoming faster as the fluence increases. The latter is interpreted, through comparison with simulation, as a side-effect of the degradation in light transmission. The experimental results obtained can be used to estimate the long term performance of the CMS ECAL.

The reaction pp→K+K− has been studied for incident antiproton momenta between 1.3 and 1.5 GeV/c. A continuous scan has been made for invariant masses of the pp system between 2220 and 2240 MeV/c2 with a resolution of 0.6 MeV/c2 in the ξ (2230) region. No structure has been observed. Upper limits are given.

A measurement of the total cross section for the reaction pp → π+π− has been performed for seven values of the incident momentum between 158 and 275 MeV/c. The values obtained, if compared with previous results at higher momenta, agree with a 1/ß dependence. The differential cross section sssumed over the whole incident momentum range has also been measured and the result of a fit by Legendre polynomials is given.

A search is performed for the production of a massive W′ boson decaying to a top and a bottom quark. The data analysed correspond to an integrated luminosity of 19.7 fb−1 collected with the CMS detector at the LHC in proton-proton collisions at $$ \sqrt{s}=8 $$ TeV. The hadronic decay products of the top quark with high Lorentz boost from the W′ boson decay are detected as a single top flavoured jet. The use of jet substructure algorithms allows the top quark jet to be distinguished from standard model QCD background. Limits on the production cross section of a right-handed W′ boson are obtained, together with constraints on the left-handed and right-handed couplings of the W′ boson to quarks. The production of a right-handed W′ boson with a mass below 2.02 TeV decaying to a hadronic final state is excluded at 95% confidence level. This mass limit increases to 2.15 TeV when both hadronic and leptonic decays are considered, and is the most stringent lower mass limit to date in the tb decay mode.

The detector presented is designed to measure the proton e.m. form factors by measuring e+e− pairs produced in pp annihilations at low energy or at rest. In this paper the apparatus is described in detail, with emphasis on how to achieve a suppression factor of about 1010 of the hadronic background.

Our recently published ${\ensuremath{\pi}}^{0}$ photoproduction data at threshold have been reanalyzed with the use of a more refined detection efficiency calculation. The high energy points appear to be consistent with the threshold measurements; the effective threshold amplitudes remain unchanged, and are now supported by the complete set of experimental data.[NUCLEAR REACTIONS ($\ensuremath{\gamma},{\ensuremath{\pi}}^{0}$), $^{1}\mathrm{H}$, $^{2}\mathrm{H}$, $^{3}\mathrm{He}$, and $^{4}\mathrm{He}$ targets; measured reaction yields, ${E}_{\ensuremath{\pi}0}=1\ensuremath{-}10$ MeV.]

This paper describes the selective read-out processor (SRP) proposed for the electromagnetic calorimeter (ECAL) of the CMS experiment at LHC (CERN). The aim is to reduce raw ECAL data to a level acceptable by the CMS DAQ system. For each positive level 1 trigger, the SRP is guided by trigger primitive generation electronics to identify ECAL regions with energy deposition satisfying certain programmable criteria. It then directs the ECAL read-out electronics to apply predefined zero suppression levels to the crystal data, depending whether the crystals fall within these regions or not. About 200 of high speed 1.6 Gbit/s I/O channels, asynchronous operation at up to 100 kHz level 1 trigger rate, a stringent real-time requirement of 5 /spl mu/s latency and flexibility in choice of selection algorithms are the main challenges of the SRP application. The architecture adopted for the SRP is based on modern parallel optic pluggable modules and high density FPGA devices with embedded processors and multi-gigabit transceivers. Implementation studies to validate proposed solutions are presented. The performance of envisaged selection algorithms is investigated with the CMS detector simulation software. The robustness of optical communication channels is estimated via direct measurements and calculations. The feasibility to perform data reduction operations within the allocated timing budget is verified by running a representative SRP firmware on a development board with a Xilinx Virtex2Pro FPGA device.

Test beam results of a calorimetric module based on 3×3×22 cm3 PbWO4 crystals, identical to those used in the CMS ECAL Endcaps, read out by a pair of photodetectors coupled to the two opposite sides (front and rear) of each crystal are presented. Nine crystals with different level of induced absorption, from 0 to 20 m−1, have been tested using electrons in the 50–200 GeV energy range. Photomultiplier tubes have been chosen as photodetectors to allow for a precise measurement of highly damaged crystals. The information provided by this double side read-out configuration allows to correct for event-by-event fluctuations of the longitudinal development of electromagnetic showers. By strongly mitigating the effect of non-uniform light collection efficiency induced by radiation damage, the double side read-out technique significantly improves the energy resolution with respect to a single side read-out configuration. The non-linearity of the response arising in damaged crystals is also corrected by a double side read-out configuration and the response linearity of irradiated crystals is restored. In high radiation environments at future colliders, as it will be the case for detectors operating during the High Luminosity phase of the Large Hadron Collider, defects can be created inside the scintillator volume leading to a non-uniform response of the calorimetric cell. The double side read-out technique presented in this study provides a valuable way to improve the performance of calorimeters based on scintillators whose active volumes are characterized by high aspect ratio cells similar to those used in this study.

Antiproton annihilation at rest in gaseous hydrogen (16 bar pressure) to the final states ρ(770)X andf 2(1270)X, whereX stands for one or more neutral mesons, has been studied at LEAR using the CPLEAR detector. Relative branching ratios are given forX =π 0,2π 0, 3π 0 ω in the ρ case, and forX =π 0, η in thef 2 case. The annihilation channel $$\bar pp \to \rho 3\pi ^0 $$ has not been measured before. The fraction of P-wave annihilation is deduced from the ratiof 2 π 0/ρπ 0 to be 0.38±0.07, in good agreement with the result previously obtained by CPLEAR from the ratioK + K -/π + π -.

A search for massive resonances decaying to a Z boson and a photon is performed in events with a hadronically decaying Z boson candidate, separately in light-quark and b quark decay modes, identified using jet substructure and advanced b tagging techniques. Results are based on samples of proton-proton collisions collected with the CMS detector at the LHC at center-of-mass energies of 8 and 13 TeV, corresponding to integrated luminosities of 19.7 and 2.7 inverse femtobarns, respectively. The results of the search are combined with those of a similar search in the leptonic decay modes of the Z boson, based on the same data sets. Spin-0 resonances with various widths and with masses in a range between 0.2 and 3.0 TeV are considered. No significant excess is observed either in the individual analyses or the combination. The results are presented in terms of upper limits on the production cross section of such resonances and constitute the most stringent limits to date for a wide range of masses.

The ratio of positive pion photoproduction cross-sections on $sup 6$Li and protons was measured near the threshold. The result is considerably lower than the existing theoretical predictions. (FR)

Orientación escolar : unos cuantos problemas - Economie et statistique vuelve a examinar aqui unos cuantos elementos de un informe relativo a los problemas planteados por la información y la orientación escolar y profesional de la juventud. Dicha orientación es demasiado precoz (son los ninos que plantean el mayor número de problemas los que deben de elegir más temprano), la escala de selección de las familias se verifica limitada, es una « selección por fracaso » y algunas orientaciones encarrilan a un estancamiento : tales son las mayores criticas formuladas por los 800 padres, alumnos, profesores y cuadros de la Agence nationale pour l'emploi (Agencia nacional pro empleo) cuestionados hace un año en la region Ródano-Alpes.

The CPLEAR experiment at CERN studies theCP, T andCPT symmetries in the neutral-kaon system by measuring the rate asymmetries between the decays of initially pure K0 and $$\overline {K^0 } $$ states. Using data taken between 1990 and mid 1994, precise measurements of |η+-|,φ +- and Δm are reported. The comparison of φ+- the superweak phase gives one of the most sensitive tests ofCPT invariance and leads to a new limit on the $$K^0 - \overline {K^0 } $$ mass difference.

Bityukov S.I. et al. On the production control of the CMS electromagnetic calorimeter: IHEP Preprint 96-77. – Protvino, 1996. – p. 8, figs. 2, refs.: 6. Some ideas concerning the object-oriented software for simulation, analysis, planning and control of production process at the CMS electromagnetic calorimeter are considered.

We describe the status of experiment PS195, which is under way on LEAR at CERN to study CP violation starting with pure K0 or K̄0 states. Early results on backgrounds and systematic effects agree with expectations from the original proposal. An asymmetry in particle‐anti‐particle partial decay rates has been seen for the first time.

The values of the proton form factor in the time‐like region have been determined for values of Q2 ranging from threshold to 4.2 (GeV/c)2. The data were collected in an experiment performed at the LEAR at CERN. The final results are presented here. We observed a s dependence of the form factor near threshold which is not in agreement with the previous experiments. We found also the CM angular distributions of the e+e− pair at various energies compatible with the ‖Ge‖=‖Gm‖ hypothesis.

Biology of the CellVolume 84, Issue 1-2 p. 108-108 Intergametic fusion in maize Catherine Digonnet, Catherine Digonnet Reconnaissance Cellulaire et Amélioration des Plantes. UMR 9938 CNRS-INRA-ENS, Ecole Normale Supérieure de Lyon, 46 allée d'Italie 69364 Lyon cedex 07, France.Search for more papers by this authorJean-Emmanuel Faure, Jean-Emmanuel Faure Reconnaissance Cellulaire et Amélioration des Plantes. UMR 9938 CNRS-INRA-ENS, Ecole Normale Supérieure de Lyon, 46 allée d'Italie 69364 Lyon cedex 07, France.Search for more papers by this authorDidier Aldon, Didier Aldon Reconnaissance Cellulaire et Amélioration des Plantes. UMR 9938 CNRS-INRA-ENS, Ecole Normale Supérieure de Lyon, 46 allée d'Italie 69364 Lyon cedex 07, France.Search for more papers by this authorMireille Rougier, Mireille Rougier Reconnaissance Cellulaire et Amélioration des Plantes. UMR 9938 CNRS-INRA-ENS, Ecole Normale Supérieure de Lyon, 46 allée d'Italie 69364 Lyon cedex 07, France.Search for more papers by this authorChristian Dumas, Christian Dumas Reconnaissance Cellulaire et Amélioration des Plantes. UMR 9938 CNRS-INRA-ENS, Ecole Normale Supérieure de Lyon, 46 allée d'Italie 69364 Lyon cedex 07, France.Search for more papers by this author Catherine Digonnet, Catherine Digonnet Reconnaissance Cellulaire et Amélioration des Plantes. UMR 9938 CNRS-INRA-ENS, Ecole Normale Supérieure de Lyon, 46 allée d'Italie 69364 Lyon cedex 07, France.Search for more papers by this authorJean-Emmanuel Faure, Jean-Emmanuel Faure Reconnaissance Cellulaire et Amélioration des Plantes. UMR 9938 CNRS-INRA-ENS, Ecole Normale Supérieure de Lyon, 46 allée d'Italie 69364 Lyon cedex 07, France.Search for more papers by this authorDidier Aldon, Didier Aldon Reconnaissance Cellulaire et Amélioration des Plantes. UMR 9938 CNRS-INRA-ENS, Ecole Normale Supérieure de Lyon, 46 allée d'Italie 69364 Lyon cedex 07, France.Search for more papers by this authorMireille Rougier, Mireille Rougier Reconnaissance Cellulaire et Amélioration des Plantes. UMR 9938 CNRS-INRA-ENS, Ecole Normale Supérieure de Lyon, 46 allée d'Italie 69364 Lyon cedex 07, France.Search for more papers by this authorChristian Dumas, Christian Dumas Reconnaissance Cellulaire et Amélioration des Plantes. UMR 9938 CNRS-INRA-ENS, Ecole Normale Supérieure de Lyon, 46 allée d'Italie 69364 Lyon cedex 07, France.Search for more papers by this author First published: 1995 https://doi.org/10.1016/0248-4900(96)81417-1AboutPDF ToolsRequest permissionExport 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 onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume84, Issue1-21995Pages 108-108 RelatedInformation

The observation of the K0, K0 decay asymmetry is a direct proof of CP violation. In this paper preliminary experimental results obtained by studying the decays into π+π− are reported.

Le rapport etabli au nom du Conseil economique et social par le pere Joseph Wresinski et paru debut 1987, insistait tout particulierement sur les lacunes de la connaissance des phenomenes de pauvrete-precarite. A la suite de ce rapport, un certain nombre de voix, emanant notamment des associations, se sont elevees au sein du Conseil national de l’information statistique (CNIS) pour dire « qu’il faut repondre aux interrogations qui nous sont posees dans le rapport Wresinski, faire un audit du systeme statistique, et proposer des ameliorations. »