A Measurement of the τ − → e − ν̄ e ν τ Branching Ratio The OPAL Collaboration

Giovanni Abbiendi, K. Ackerstaff,Gideon Alexander,John Allison, N. Altekamp,Kelby Anderson, Stuart B. Anderson,Silvia Arcelli,Shoji Asai, Steve Ashby, David Axen,Georges Azuelos, Austin H. Ball,Elisabetta Luigia Barberio,Roger John Barlow, Rainer Bartoldus, J Richard Batley, Scott M. Baumann, J. Bechtluft, Ties Behnke, Ken W. Bell,Gideon Bella,Alain Bellerive, Stanislaus Cornelius Maria Bentvelsen,Siegfried Bethke, S. T. Betts,Otmar Biebel, A. Biguzzi, Stephen D. Bird,Volker Blobel, Ian J Bloodworth, P. Bock, Jenny Böhme, Daniele Bonacorsi, Madjid Boutemeur, Sylvie Braibant, P. G. Bright-Thomas, Luca Brigliadori, Raymond M. Brown, Helfried Burckhart, Paolo Capiluppi, Rebecca Carnegie, Antony Carter,Janet Carter, C. Y. Chang, David G. Charlton, Dayah Chrisman, Claudia Ciocca, P. E. L. Clarke, Edmund W. Clay, I. Cohen, Joseph Edward Conboy, Olivia Cooke, C. Couyoumtzelis, R. L. Coxe,Marco Cuffiani,Shlomo Dado, G. M. Dallavalle, Robert F. Davis, S. De, Jong, Albert De Roeck,Paul Dervan, Klaus Kurt Desch,Beatrix Dienes, Madhu Dixit, Jörg Dubbert, Ehud Duchovni,Guenter Duckeck, I. P. Duerdoth, D. Eatough, P. G. Estabrooks,Erez Etzion, Fabrizio Fabbri,Marcello Fanti, A. A. Faust, Franz Fiedler, M. Fierro, Ivor Fleck,Ron Folman, A. Fuertjes, David Futyan, Pauline Gagnon, John William Gary, J. Gascon,S. M. Gascon-Shotkin, Goetz Gaycken, Christoph Geich-Gimbel, G. A. Giacomelli,Paolo Giacomelli,Vernon C. Gibson,William Gibson, Douglas Gingrich, Douglas Andrew Glenzinski, Jason Goldberg, W. Gorn,Claudio Grandi,Katie Leanne Graham,Eilam Gross, Jacob Grunhaus, Magali Gruwe, Gail G. Hanson, Marc Hansroul, Maciej Hapke, K. Harder, Amnon Harel, C. K. Hargrove, Christian Johannes Hartmann,Michael Hauschild,Christopher Hawkes, Richard John Hawkings, Richard J. Hemingway, Matthew Fairbanks Herndon, Gregor Herten, R. D. Heuer, Michael D. Hildreth, J. C. Hill,Peter R Hobson, Michael Hoch, Andreas Hocker, Kara Dion Hoffman, Roger J. Homer, A. K. Honma,David P. Horvath, Khondker R Hossain, Ralph W. Howard, Petra Huentemeyer, Peter Igo-Kemenes, D. C. Imrie, Kazumasa Ishii, Feba Ray Jacob, Abolhassan Jawahery, H. Jeremie, Martin Paul Jimack, C. R. Jones, Predrag Jovanovi'c, T. R. Junk,Douglas L. Karlen, Vakhtang Kartvelishvili, Kiyotomo Kawagoe,Tatsuo Kawamoto, P. I. Kayal, Richard Keeler, R. G. Kellogg, B. W. Kennedy,Dong H. Kim, Amit Klier, Stefan Kluth,Takashi Kobayashi, Michael Kobel, D. S. Koetke, Th. Kokott, Martin Kolrep,Sachio Komamiya, Robert Victor Kowalewski, Thomas H. Kress, Peter Williamson Krieger, J. von Krogh, Thorsten Kuhl, Paul Kyberd,George Lafferty, Hagar Yael Landsman, Dankfried Lanske, J. Lauber,Steven Ray Lautenschlager,Ian T. Lawson, J. G. Layter,Dragica Lazić, A. M. Iv Lee, Daniel Lellouch, James Robert Letts, Lorne Levinson, R. Liebisch,B. List, Chris Littlewood,Andrew W. Lloyd,Stephen Lloyd, F. K. Loebinger, George Long, Michael J Losty, Jean Ludwig, David M. Liu, Anna Macchiolo, Amy Macpherson, Wolfgang Mader, Marcello Mannelli,Stefano Marcellini, Constantinos Markopoulos, Andre Martin, J. P. Martin,G. Martinez, Tetsuro Mashimo, Peter Maettig, W.John McDonald,Ja Mckenna, E. A. Mckigney, Thomas J. Mcmahon, Robert McPherson,Frans Meijers, Sven Menke, Frank S. Merritt, H. Mes, Jacques Meyer, Aldo Michelini, S. Mihara, Giora Mikenberg,Danny Miller, R. Mir,Wolfgang Mohr,Alessandro Montanari,Tatsuya Mori, Kentaro Nagai, Ichizo Nakamura, Homer Neal, Bernd Nellen, Richard Nisius,S. W. O'neale, F. G. Oakham, Fabrizio Odorici, Harold Ogren, M. J. Oreglia, S. Orito, József Pálinkás,Gabriella Pásztor, Joleen R. Pater, G. N. Patrick, J. Patt, R. Perez-Ochoa, S. Petzold, P. Pfeifenschneider, James Pilcher, James L. Pinfold,David Plane, P. R. Poffenberger, Jaroslaw Polok, Mariusz Przybycien, Ch. Rembser, Hartmut Rick,Scott W. H. Robertson, S. A. Robins, Nathan Lee Rodning,J. Michael Roney, Keith A. Roscoe, Antonio Maria Rossi,Yoram Rozen,Keith Runge, O. Runolfsson, David R. Rust, Kirsten Sachs, Takayuki Saeki,O. Sahr, Wei Min Sang, E. K. G. Sarkisyan, Carla Sbarra, A. D. Schaile,O. Schaile, Florian Scharf, P. Scharff-Hansen,Jochen Schieck, Bethina Schmitt, Stefan Schmitt, Andre Schoening, Matthias Schröder, Markus E. Schumacher,Christoph Schwick,William Scott, Rolf Seuster, T. G. Shears, Bao Chun Shen,Claire H. Shepherd-Themistocleous, Peter Sherwood,Gian Piero Siroli, Annie Sittler,Andris Skuja, Adrian M Smith, George A. Snow, Randall J. Sobie, S. Soeldner-Rembold,Stefania Spagnolo, M. Sproston, Achim Stahl,K. Stephens, Johannes Steuerer, K. Stoll, David M. Strom, Raimund Stroehmer, Bernd Surrow, S. D. Talbot,Satoshi Tanaka, Paul Taras,Shlomit Tarem,Richard Teuscher, Michael Thiergen,Jeffrey P. Thomas,M. A. Thomson, Eckhard von Toerne, Eric Torrence,Sherry Towers,Zoltan Laszlo Trocsanyi, E. Tsur, Andre Spence Turcot, M. F. Turner-Watson, Ikuo Ueda, Rick J. Van Kooten, Philippe Vannerem,Marco Verzocchi, Heinrich Voss, Frank Waeckerle,Andreas Wagner,Colleen Ward, D. R. Ward, P. M. Watkins, A. Ted Watson, N. K. Watson, Peter S. Wells,Norbert Wermes, John Sampson White, Grant W. Wilson, J. A. Wilson, Terence R Wyatt,Shinji Yamashita, G. Yekutieli, Viktor Zacek, Daniel Zer-Zion

semanticscholar（1998）

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摘要

The branching ratio for the decay τ → e−ν̄eντ has been measured using Z 0 decay data collected by the OPAL experiment at LEP. In total 33 073 τ → eν̄eντ candidates were identified from a sample of 186 197 selected τ decays, giving a branching ratio of B(τ → eν̄eντ ) = (17.81 ± 0.09 (stat) ± 0.06 (syst))%. This result is combined with other measurements to test e μ and μ τ universality in charged-current weak interactions. Additionally, the strong coupling constant αs(m 2 τ ) has been extracted from B(τ − → eν̄eντ ) and evolved to the Z mass scale, giving αs(m 2 Z) = 0.1204± 0.0011 (exp) ± 0.0019 (theory). (Submitted to Physics Letters B) The OPAL Collaboration G. Abbiendi, K.Ackerstaff, G. Alexander, J. Allison, N. Altekamp, K.J. Anderson, S. Anderson, S. Arcelli, S. Asai, S.F. Ashby, D. Axen, G. Azuelos, A.H. Ball, E. Barberio, R.J. Barlow, R. Bartoldus, J.R.Batley, S. Baumann, J. Bechtluft, T. Behnke, K.W. Bell, G. Bella, A. Bellerive, S. Bentvelsen, S. Bethke, S. Betts, O.Biebel, A. Biguzzi, S.D. Bird, V. Blobel, I.J. Bloodworth, P.Bock, J. Böhme, D. Bonacorsi, M. Boutemeur, S. Braibant, P.Bright-Thomas, L. Brigliadori, R.M. Brown, H.J.Burckhart, P.Capiluppi, R.K. Carnegie, A.A. Carter, J.R.Carter, C.Y. Chang, D.G. Charlton, D. Chrisman, C. Ciocca, P.E.L.Clarke, E. Clay, I. Cohen, J.E.Conboy, O.C.Cooke, C. Couyoumtzelis, R.L.Coxe, M. Cuffiani, S. Dado, G.M. Dallavalle, R. Davis, S. De Jong, A. de Roeck, P.Dervan, K.Desch, B. Dienes, M.S. Dixit, J. Dubbert, E.Duchovni, G. Duckeck, I.P. Duerdoth, D. Eatough, P.G.Estabrooks, E.Etzion, F. Fabbri, M. Fanti, A.A. Faust, F. Fiedler, M. Fierro, I. Fleck, R. Folman, A. Fürtjes, D.I. Futyan, P.Gagnon, J.W. Gary, J.Gascon, S.M. Gascon-Shotkin, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P.Giacomelli, V. Gibson, W.R. Gibson, D.M. Gingrich, D. Glenzinski, J. Goldberg, W. Gorn, C. Grandi, K.Graham, E. Gross, J. Grunhaus, M. Gruwé, G.G. Hanson, M. Hansroul, M. Hapke, K.Harder, A. Harel, C.K.Hargrove, C. Hartmann, M. Hauschild, C.M. Hawkes, R. Hawkings, R.J. Hemingway, M. Herndon, G. Herten, R.D. Heuer, M.D. Hildreth, J.C.Hill, P.R.Hobson, M. Hoch, A. Hocker, K.Hoffman, R.J. Homer, A.K. Honma, D. Horváth, K.R. Hossain, R. Howard, P.Hüntemeyer, P. Igo-Kemenes, D.C. Imrie, K. Ishii, F.R. Jacob, A. Jawahery, H. Jeremie, M. Jimack, C.R. Jones, P. Jovanovic, T.R. Junk, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, P.I. Kayal, R.K.Keeler, R.G. Kellogg, B.W. Kennedy, D.H. Kim, A. Klier, S. Kluth, T. Kobayashi, M. Kobel, D.S. Koetke, T.P. Kokott, M. Kolrep, S. Komamiya, R.V. Kowalewski, T. Kress, P. Krieger, J. von Krogh, T. Kuhl, P.Kyberd, G.D. Lafferty, H. Landsman, D. Lanske, J. Lauber, S.R. Lautenschlager, I. Lawson, J.G.Layter, D. Lazic, A.M. Lee, D. Lellouch, J. Letts, L. Levinson, R. Liebisch, B. List, C. Littlewood, A.W. Lloyd, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Ludwig, D. Liu, A. Macchiolo, A. Macpherson, W. Mader, M. Mannelli, S. Marcellini, C. Markopoulos, A.J. Martin, J.P.Martin, G. Martinez, T. Mashimo, P.Mättig, W.J. McDonald, J.McKenna, E.A. Mckigney, T.J. McMahon, R.A. McPherson, F. Meijers, S. Menke, F.S. Merritt, H. Mes, J.Meyer, A. Michelini, S. Mihara, G. Mikenberg, D.J. Miller, R. Mir, W. Mohr, A. Montanari, T. Mori, K. Nagai, I. Nakamura, H.A. Neal, B. Nellen, R. Nisius, S.W. O’Neale, F.G. Oakham, F. Odorici, H.O. Ogren, M.J. Oreglia, S. Orito, J. Pálinkás, G. Pásztor, J.R. Pater, G.N. Patrick, J. Patt, R. Perez-Ochoa, S. Petzold, P.Pfeifenschneider, J.E. Pilcher, J. Pinfold, D.E. Plane, P.Poffenberger, J. Polok, M. Przybycień, C. Rembser, H. Rick, S. Robertson, S.A. Robins, N. Rodning, J.M.Roney, K.Roscoe, A.M. Rossi, Y. Rozen, K.Runge, O. Runolfsson, D.R. Rust, K. Sachs, T. Saeki, O. Sahr, W.M. Sang, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, F. Scharf, P. Scharff-Hansen, J. Schieck, B. Schmitt, S. Schmitt, A. Schöning, M. Schröder, M. Schumacher, C. Schwick, W.G. Scott, R. Seuster, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Sittler, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, S. Spagnolo, M. Sproston, A. Stahl, K. Stephens, J. Steuerer, K. Stoll, D. Strom, R. Ströhmer, B. Surrow, S.D. Talbot, S. Tanaka, P.Taras, S. Tarem, R. Teuscher, M. Thiergen, J.Thomas, M.A. Thomson, E. von Törne, E.Torrence, S. Towers, I. Trigger, Z.Trócsányi, E. Tsur, A.S. Turcot, M.F. Turner-Watson, I. Ueda, R. Van Kooten, P.Vannerem, M. Verzocchi, H. Voss, F. Wäckerle, A. Wagner, C.P.Ward, D.R. Ward, P.M.Watkins, A.T. Watson, N.K. Watson, P.S. Wells, N. Wermes, J.S. White, G.W. Wilson, J.A.Wilson, T.R. Wyatt, S. Yamashita, G. Yekutieli, V. Zacek, D. Zer-Zion School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK Dipartimento di Fisica dell’ Università di Bologna and INFN, I-40126 Bologna, Italy Physikalisches Institut, Universität Bonn, D-53115 Bonn, Germany Department of Physics, University of California, Riverside CA 92521, USA Cavendish Laboratory, Cambridge CB3 0HE, UK Ottawa-Carleton Institute for Physics, Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6,

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