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Precision <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> beam polarimetry at an <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math> <mml:math xmlns:…

J. P. Lees,V. Poireau,V. Tisserand,E. Graugés,A. Palano,G. Eigen,D. N. Brown,Yu. G. Kolomensky,M. Fritsch,H. Koch,R. Cheaib,C. Hearty,T. S. Mattison,J. A. McKenna,R. Y. So,A. R. Buzykaev,A. R. Buzykaev,В. П. Дружинин,E. A. Kozyrev,E. A. Kravchenko,S. I. Serednyakov,Yu. I. Skovpen,E. P. Solodov,K. Yu Todyshev,A. J. Lankford,B. Dey,J. W. Gary,Owen Rosser Long,A. M. Eisner,W. S. Lockman,W. Panduro Vazquez,D. S. Chao,C. H. Cheng,B. Echenard,K. T. Flood,D. G. Hitlin,Y. Li,D. X. Lin,S. Middleton,T. S. Miyashita,P. Ongmongkolkul,J. Oyang,F. C. Porter,M. Röhrken,B. T. Meadows,Michael Sokoloff,J. G. Smith,Stephen Robert Wagner,D. Bernard,M. Verderi,D. Bettoni,C. Bozzi,R. Calabrese,G. Cibinetto,E. Fioravanti,I. Garzia,E. Luppi,V. Santoro,A. Calcaterra,R. de Sangro,G. Finocchiaro,S. Martellotti,P. Patteri,I. M. Peruzzi,M. Piccolo,M. Rotondo,A. Zallo,S. Passaggio,C. Patrignani,Brian Shuve,H. Lacker,B. Bhuyan,U. Mallik,Chunhui Chen,J. Cochran,S. Prell,A. V. Gritsan,N. Arnaud,M. Davier,F. Le Diberder,A. M. Lutz,G. Wormser,David Lange,Douglas Wright,J. P. Coleman,D. E. Hutchcroft,D. J. Payne,C. Touramanis,A. J. Bevan,F. Di Lodovico,G. Cowan,Swagato Banerjee,D. N. Brown,C. L. Davis,A. Denig,W. Gradl,K. Grießinger,A. Hafner,K. R. Schubert,R. J. Barlow,G. D. Lafferty,R. Cenci,A. Jawahery,D. A. Roberts,R. Cowan,S. H. Robertson,R. M. Seddon,N. Neri,F. Palombo,L. Cremaldi,R. Godang,D. J. Summers,G. De Nardo,C. Sciacca,Colin Jessop,J. M. LoSecco,K. Honscheid,A. Gaz,M. Margoni,G. Simi,F. Simonetto,R. Stroili,S. Akar,E. Ben-Haim,M. Bomben,G. R. Bonneaud,G. Calderini,J. Chauveau,G. Marchiori,J. Ocariz,M. Biasini,E. Manoni,Alessandro Rossi,G. Batignani,S. Bettarini,M. Carpinelli,G. Casarosa,M. Chrząszcz,F. Forti,M. A. Giorgi,A. Lusiani,B. Oberhof,E. Paoloni,M. Rama,G. Rizzo,J. Walsh,L. Zani,A. J. S. Smith,F. Anulli,R. Faccini,F. Ferrarotto,F. Ferroni,A. Pilloni,C. Bünger,S. Dittrich,O. Grünberg,T. Leddig,C. Voß,R. Waldi,T. Adye,F. F. Wilson,S. Emery-Schrenk,G. Vasseur,D. Aston,C. Cartaro,M. R. Convery,W. Dunwoodie,M. Ebert,R. C. Field,B. G. Fulsom,M. T. Graham,C. Hast,P. Kim,S. Luitz,D. B. MacFarlane,Denise Müller,H. A. Neal,B. N. Ratcliff,A. Roodman,M. K. Sullivan,J. Va’vra,W. J. Wisniewski,M. V. Purohit,J. R. Wilson,Stephen Jacob Sekula,H. Ahmed,N. Tasneem,M. Bellis,P. R. Burchat,E. M. T. Puccio,J. Ernst,R. Gorodeisky,N. Guttman,D. R. Peimer,A. Soffer,Stefan Spanier,J. L. Ritchie,J. M. Izen,Xinchou Lou,F. Bianchi,F. De Mori,A. Filippi,L. Lanceri,L. Vitale,F. Martínez-Vidal,A. Oyanguren,J. Albert,A. Beaulieu,Florian Urs Bernlochner,G. Godden,G. J. King,R. Kowalewski,T. Lueck,C. Miller,I. M. Nugent,J. M. Roney,R. Sobie,T. Gershon,P. F. Harrison,T. E. Latham,Sau Lan Wu

Physics

Polarization (electrochemistry)

Particle physics

2023

We present a new technique, ``tau polarimetry,'' for measuring the longitudinal beam polarization present in an ${e}^{+}{e}^{\ensuremath{-}}$ collider through the analysis of ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$ events. By exploiting the sensitivity of $\ensuremath{\tau}$ decay kinematics to the longitudinal polarization of the beams, we demonstrate that the longitudinal polarization can be measured with a 3 per mil systematic uncertainty at the interaction point using a technique that is independent of spin and beam transport modeling. Using $424.2\ifmmode\pm\else\textpm\fi{}1.8\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of BABAR data at $\sqrt{s}=10.58\text{ }\text{ }\mathrm{GeV}$, the average longitudinal polarization of the PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ collider has been measured to be $⟨P⟩=0.0035\ifmmode\pm\else\textpm\fi{}0.002{4}_{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}0.002{9}_{\mathrm{sys}}$. The systematic uncertainty studies are described in detail, which can serve as a guide for future applications of tau polarimetry. A proposed ${e}^{\ensuremath{-}}$ beam longitudinal polarization upgrade to the SuperKEKB ${e}^{+}{e}^{\ensuremath{-}}$ collider would benefit from this technique.

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“Precision <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> beam polarimetry at an <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math> <mml:math xmlns:…” is a paper by J. P. Lees V. Poireau V. Tisserand E. Graugés A. Palano G. Eigen D. N. Brown Yu. G. Kolomensky M. Fritsch H. Koch R. Cheaib C. Hearty T. S. Mattison J. A. McKenna R. Y. So A. R. Buzykaev A. R. Buzykaev В. П. Дружинин E. A. Kozyrev E. A. Kravchenko S. I. Serednyakov Yu. I. Skovpen E. P. Solodov K. Yu Todyshev A. J. Lankford B. Dey J. W. Gary Owen Rosser Long A. M. Eisner W. S. Lockman W. Panduro Vazquez D. S. Chao C. H. Cheng B. Echenard K. T. Flood D. G. Hitlin Y. Li D. X. Lin S. Middleton T. S. Miyashita P. Ongmongkolkul J. Oyang F. C. Porter M. Röhrken B. T. Meadows Michael Sokoloff J. G. Smith Stephen Robert Wagner D. Bernard M. Verderi D. Bettoni C. Bozzi R. Calabrese G. Cibinetto E. Fioravanti I. Garzia E. Luppi V. Santoro A. Calcaterra R. de Sangro G. Finocchiaro S. Martellotti P. Patteri I. M. Peruzzi M. Piccolo M. Rotondo A. Zallo S. Passaggio C. Patrignani Brian Shuve H. Lacker B. Bhuyan U. Mallik Chunhui Chen J. Cochran S. Prell A. V. Gritsan N. Arnaud M. Davier F. Le Diberder A. M. Lutz G. Wormser David Lange Douglas Wright J. P. Coleman D. E. Hutchcroft D. J. Payne C. Touramanis A. J. Bevan F. Di Lodovico G. Cowan Swagato Banerjee D. N. Brown C. L. Davis A. Denig W. Gradl K. Grießinger A. Hafner K. R. Schubert R. J. Barlow G. D. Lafferty R. Cenci A. Jawahery D. A. Roberts R. Cowan S. H. Robertson R. M. Seddon N. Neri F. Palombo L. Cremaldi R. Godang D. J. Summers G. De Nardo C. Sciacca Colin Jessop J. M. LoSecco K. Honscheid A. Gaz M. Margoni G. Simi F. Simonetto R. Stroili S. Akar E. Ben-Haim M. Bomben G. R. Bonneaud G. Calderini J. Chauveau G. Marchiori J. Ocariz M. Biasini E. Manoni Alessandro Rossi G. Batignani S. Bettarini M. Carpinelli G. Casarosa M. Chrząszcz F. Forti M. A. Giorgi A. Lusiani B. Oberhof E. Paoloni M. Rama G. Rizzo J. Walsh L. Zani A. J. S. Smith F. Anulli R. Faccini F. Ferrarotto F. Ferroni A. Pilloni C. Bünger S. Dittrich O. Grünberg T. Leddig C. Voß R. Waldi T. Adye F. F. Wilson S. Emery-Schrenk G. Vasseur D. Aston C. Cartaro M. R. Convery W. Dunwoodie M. Ebert R. C. Field B. G. Fulsom M. T. Graham C. Hast P. Kim S. Luitz D. B. MacFarlane Denise Müller H. A. Neal B. N. Ratcliff A. Roodman M. K. Sullivan J. Va’vra W. J. Wisniewski M. V. Purohit J. R. Wilson Stephen Jacob Sekula H. Ahmed N. Tasneem M. Bellis P. R. Burchat E. M. T. Puccio J. Ernst R. Gorodeisky N. Guttman D. R. Peimer A. Soffer Stefan Spanier J. L. Ritchie J. M. Izen Xinchou Lou F. Bianchi F. De Mori A. Filippi L. Lanceri L. Vitale F. Martínez-Vidal A. Oyanguren J. Albert A. Beaulieu Florian Urs Bernlochner G. Godden G. J. King R. Kowalewski T. Lueck C. Miller I. M. Nugent J. M. Roney R. Sobie T. Gershon P. F. Harrison T. E. Latham Sau Lan Wu published in 2023. It has an Open Access status of “hybrid”. You can read and download a PDF Full Text of this paper here.