W Boson Polarisation at LEP 2 The OPAL Collaboration

Giovanni Abbiendi,C. Ainsley, P. F. Åkesson,Gideon Alexander,John Allison,Pedro Amaral,Georgios Anagnostou,Kelby Anderson,Silvia Arcelli,Shoji Asai, David Axen, Georges Azuelos,Ian Richard Bailey, Elisabetta Luigia Barberio, Teresa Barillari, R. J. Barlow,Richard Batley,Philip Bechtle, Ties Behnke, Ken W. Bell, P. J. Bell,Gideon Bella,Alain Bellerive,Gabriele Benelli,Siegfried Bethke,Otmar Biebel, Oana Elena Vickey Boeriu, P. Bock, Madjid Boutemeur, Sylvie Braibant, Luca Brigliadori, Raymond M. Brown, Karsten Buesser, Helfried Burckhart, Simone Campana, Rebecca Carnegie, Antony Carter,Janet Carter, C. Y. Chang, D. G. Charlton, Claudia Ciocca, J. P. Couchman, A. Csilling,Marco Cuffiani,Shlomo Dado, Albert De Roeck, Eddi A. De Wolf, Klaus Kurt Desch, Beatrix Dienes, M M Donkers, Jörg Dubbert, Ehud Duchovni,Guenter Duckeck, I. P. Duerdoth, Erez Etzion, Federica Fabbri, Lutz Werner Feld,Pablo A. Ferrari, Franz Fiedler, Ivor Fleck, M. Ford, A. Frey, Pauline Gagnon, John William Gary, Goetz Gaycken, Christoph Geich-Gimbel, G. A. Giacomelli, Paolo Giacomelli, Michele Giunta, Jason Goldberg,Eilam Gross, Jacob Grunhaus, Magali Gruwe, P. O. Guenther, Anik Gupta,Csaba Hajdu,M. Hamann, Gail G. Hanson, Amnon Harel,Michael Hauschild,Christopher Hawkes, Richard John Hawkings, Richard J. Hemingway, Gregor Herten, R. D. Heuer, J. C. Hill, Kara Dion Hoffman,David P. Horvath, Peter Igo-Kemenes, Kazumasa Ishii, H. Jeremie, Predrag Jovanovi'c, T. R. Junk,Naoko Kanaya, Junichi Kanzaki,Douglas L. Karlen, Kiyotomo Kawagoe,Tatsuo Kawamoto, Richard Keeler, R. G. Kellogg, B. W. Kennedy,Katja Klein, Amit Klier, Stefan Kluth,Takashi Kobayashi, Michael Kobel,Sachio Komamiya, T. Kraemer, Peter Williamson Krieger, J. von Krogh, K. Kruger, Thorsten Kuhl, Michael Kupper, G. D. Lafferty, Hagar Yael Landsman, Dankfried Lanske, J. G. Layter, Daniel Lellouch, James Robert Letts, Lorne Levinson, J. Lillich,Stephen Lloyd, F. K. Loebinger,Jianke Lu,Andreas Ludwig, Jean Ludwig, Wolfgang Mader,Stefano Marcellini, Andre Martin, Gianni Masetti, Tetsuro Mashimo, Peter Maettig,Ja Mckenna, Robert McPherson,Frans Meijers, Wolfgang Menges, Frank S. Merritt, H. Mes, Aldo Michelini, S. Mihara, Giora Mikenberg,Danny Miller, Shulamit Moed,Wolfgang Mohr,Takehiro Mori, A. F. Mutter,Koichi Nagai, Ichizo Nakamura,Hiroshi Nanjo, Homer Neal, Richard Nisius,S. W. O'neale,Alexander Oh, A N Okpara, M. J. Oreglia, S. Orito,Christoph Pahl,Gabriella Pásztor, Joleen R. Pater, James Pilcher, James L. Pinfold,David Plane, Bonnie Poli,Oliver Pooth, Mariusz Przybycien,Arnulf Quadt, Klaus Rabbertz, Ch. Rembser, Peter Renkel,J. Michael Roney,Stefano Rosati,Yoram Rozen,Keith Runge, Kirsten Sachs, Takayuki Saeki, E. K. G. Sarkisyan, A. D. Schaile,O. Schaile, P. Scharff-Hansen,Jochen Schieck, Thomas Schoerner-Sadenius, Matthias Schröder, Markus E. Schumacher,William Scott, Rolf Seuster, T. G. Shears, Bao Chun Shen, Peter Sherwood,Andris Skuja, Adrian M Smith, Randall J. Sobie, S. Soeldner-Rembold,Francesco Spanò, Achim Stahl, David M. Strom, Raimund Stroehmer,Shlomit Tarem, Marek Taševský,Richard Teuscher,M. A. Thomson, Eric Torrence, Daisuke Toya,P. Dinh Tran,Isabel Marian Trigger,Zoltan Laszlo Trocsanyi, E. Tsur, M. F. Turner-Watson, Ikuo Ueda, Balázs Ujvári, C. F. Vollmer, Philippe Vannerem, Robert Vertesi,Marco Verzocchi, Heinrich Voss, Joost Vossebeld,David A. Waller,Colleen Ward, D. R. Ward, P. M. Watkins,Alexander Watson, N. K. Watson, Peter S. Wells, Thorsten Wengler,Norbert Wermes, D. Wetterling, Grant W. Wilson, J. A. Wilson, Gy. Wolf,Terry Richard Wyatt, Satoru Yamashita, Daniel Zer-Zion, Lidija Živković

semanticscholar（2003）

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摘要

Elements of the spin density matrix for W bosons in e+e− → W+W− → qq̄lνl events are measured from data recorded by the OPAL detector at LEP. This information is used to calculate polarised differential cross-sections and to search for CP-violating effects. Results are presented for W bosons produced in e+e− collisions with centre-of-mass energies between 183 GeV and 209 GeV. The average fraction of W bosons that are longitudinally polarised is found to be (23.9 ± 2.1 ± 1.1)% compared to a Standard Model prediction of (23.9 ± 0.1)%. All results are consistent with CP conservation. To be submitted to Physics Letters B. The OPAL Collaboration G. Abbiendi2, C.Ainsley5, P.F. Åkesson3,y, G.Alexander22, J.Allison16, P. Amaral9, G. Anagnostou1, K.J. Anderson9, S.Arcelli2, S.Asai23, D. Axen27, G. Azuelos18,a, I. Bailey26, E. Barberio8,p, T.Barillari32, R.J. Barlow16, R.J. Batley5, P. Bechtle25, T.Behnke25, K.W. Bell20, P.J. Bell1, G. Bella22, A. Bellerive6, G.Benelli4, S. Bethke32, O.Biebel31, O.Boeriu10, P. Bock11, M. Boutemeur31, S. Braibant8, L. Brigliadori2, R.M. Brown20, K.Buesser25, H.J. Burckhart8, S. Campana4, R.K.Carnegie6, A.A. Carter13, J.R.Carter5, C.Y.Chang17, D.G. Charlton1, C. Ciocca2, J. Couchman15, A.Csilling29, M. Cuffiani2, S.Dado21, A. De Roeck8, E.A. De Wolf8,s, K.Desch25, B. Dienes30, M.Donkers6, J.Dubbert31, E.Duchovni24, G.Duckeck31 , I.P. Duerdoth16, E. Etzion22, F. Fabbri2, L. Feld10, P. Ferrari8, F. Fiedler31, I. Fleck10, M. Ford5, A. Frey8, P. Gagnon12, J.W. Gary4, G. Gaycken25, C.Geich-Gimbel3, G. Giacomelli2, P.Giacomelli2 , M. Giunta4, J.Goldberg21, E.Gross24, J.Grunhaus22, M. Gruwé8, P.O.Günther3, A. Gupta9, C.Hajdu29, M. Hamann25, G.G. Hanson4, A.Harel21, M.Hauschild8, C.M.Hawkes1, R.Hawkings8, R.J.Hemingway6, G. Herten10, R.D. Heuer25, J.C.Hill5, K.Hoffman9, D.Horváth29,c, P. Igo-Kemenes11, K. Ishii23, H. Jeremie18, P. Jovanovic1, T.R. Junk6,i, N. Kanaya26, J.Kanzaki23,u, D. Karlen26, K. Kawagoe23, T.Kawamoto23, R.K. Keeler26, R.G. Kellogg17, B.W. Kennedy20, K.Klein11,t, A.Klier24, S.Kluth32, T.Kobayashi23, M. Kobel3, S.Komamiya23, T.Krämer25, P.Krieger6,l, J. von Krogh11, K.Kruger8, T.Kuhl25, M. Kupper24, G.D. Lafferty16, H. Landsman21, D. Lanske14, J.G. Layter4, D. Lellouch24, J. Letts, L. Levinson24, J. Lillich10, S.L. Lloyd13, F.K. Loebinger16, J. Lu27,w, A. Ludwig3, J. Ludwig10, W.Mader3, S.Marcellini2, A.J. Martin13, G. Masetti2, T.Mashimo23, P. Mättig, J.McKenna27, R.A. McPherson26, F. Meijers8, W. Menges25, F.S. Merritt9, H.Mes6,a, A. Michelini2, S.Mihara23, G. Mikenberg24, D.J. Miller15, S.Moed21, W. Mohr10, T.Mori23, A.Mutter10, K.Nagai13, I. Nakamura23,v , H. Nanjo23, H.A. Neal33, R. Nisius32, S.W. O’Neale1,∗, A. Oh8, A.Okpara11, M.J. Oreglia9, S.Orito23,∗, C. Pahl32, G.Pásztor4,g, J.R.Pater16, J.E. Pilcher9, J. Pinfold28, D.E. Plane8, B. Poli2, O. Pooth14, M. Przybycień8,n, A. Quadt3, K. Rabbertz8,r, C.Rembser8, P.Renkel24, J.M.Roney26, S.Rosati3,y, Y.Rozen21, K.Runge10, K. Sachs6, T. Saeki23, E.K.G. Sarkisyan8,j , A.D. Schaile31, O. Schaile31, P. Scharff-Hansen8, J. Schieck32, T. Schörner-Sadenius8,a1, M. Schröder8, M. Schumacher3, W.G. Scott20, R. Seuster14,f , T.G. Shears8,h, B.C. Shen4, P. Sherwood15, A. Skuja17, A.M. Smith8, R. Sobie26, S. Söldner-Rembold15, F. Spano9, A. Stahl3,x, D. Strom19, R. Ströhmer31, S. Tarem21, M. Tasevsky8,z, R.Teuscher9, M.A. Thomson5, E.Torrence19, D. Toya23, P. Tran4, I. Trigger8, Z.Trócsányi30,e, E.Tsur22, M.F. Turner-Watson1, I. Ueda23, B. Ujvári30,e, C.F.Vollmer31, P. Vannerem10, R. Vértesi30,e, M. Verzocchi17, H. Voss8,q, J.Vossebeld8,h, D. Waller6, C.P. Ward5, D.R. Ward5, P.M. Watkins1, A.T. Watson1, N.K. Watson1, P.S.Wells8, T.Wengler8, N. Wermes3, D. Wetterling11 G.W. Wilson16,k, J.A.Wilson1, G. Wolf24, T.R.Wyatt16, S.Yamashita23, D. Zer-Zion4, L. Zivkovic24 1School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK 2Dipartimento di Fisica dell’ Università di Bologna and INFN, I-40126 Bologna, Italy 3Physikalisches Institut, Universität Bonn, D-53115 Bonn, Germany 4Department of Physics, University of California, Riverside CA 92521, USA 5Cavendish Laboratory, Cambridge CB3 0HE, UK 6Ottawa-Carleton Institute for Physics, Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada 8CERN, European Organisation for Nuclear Research, CH-1211 Geneva 23, Switzerland 9Enrico Fermi Institute and Department of Physics, University of Chicago, Chicago IL 60637, USA 10Fakultät für Physik, Albert-Ludwigs-Universität Freiburg, D-79104 Freiburg, Germany 11Physikalisches Institut, Universität Heidelberg, D-69120 Heidelberg, Germany

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