Phys. Rev. D 72, 011104 (2005) [8 pages]
Search for right-handed W bosons in top quark decay
V. M. Abazov et al. D0 Collaboration
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V. M. Abazov35, B. Abbott72, M. Abolins63, B. S. Acharya29, M. Adams50, T. Adams48, M. Agelou18, J.-L. Agram19, S. H. Ahn31, M. Ahsan57, G. D. Alexeev35, G. Alkhazov39, A. Alton62, G. Alverson61, G. A. Alves2, M. Anastasoaie34, T. Andeen52, S. Anderson44, B. Andrieu17, Y. Arnoud14, A. Askew48, B. Åsman40, A. C. S. Assis Jesus3, O. Atramentov55, C. Autermann21, C. Avila8, F. Badaud13, A. Baden59, B. Baldin49, P. W. Balm33, S. Banerjee29, E. Barberis61, P. Bargassa76, P. Baringer56, C. Barnes42, J. Barreto2, J. F. Bartlett49, U. Bassler17, D. Bauer53, A. Bean56, S. Beauceron17, M. Begel68, A. Bellavance65, S. B. Beri27, G. Bernardi17, R. Bernhard49 *, I. Bertram41, M. Besançon18, R. Beuselinck42, V. A. Bezzubov38, P. C. Bhat49, V. Bhatnagar27, M. Binder25, C. Biscarat41, K. M. Black60, I. Blackler42, G. Blazey51, F. Blekman42, S. Blessing48, D. Bloch19, U. Blumenschein23, A. Boehnlein49, O. Boeriu54, T. A. Bolton57, F. Borcherding49, G. Borissov41, K. Bos33, T. Bose67, A. Brandt74, R. Brock63, G. Brooijmans67, A. Bross49, N. J. Buchanan48, D. Buchholz52, M. Buehler50, V. Buescher23, S. Burdin49, T. H. Burnett78, E. Busato17, C. P. Buszello42, J. M. Butler60, J. Cammin68, S. Caron33, W. Carvalho3, B. C. K. Casey73, N. M. Cason54, H. Castilla-Valdez32, S. Chakrabarti29, D. Chakraborty51, K. M. Chan68, A. Chandra29, D. Chapin73, F. Charles19, E. Cheu44, D. K. Cho60, S. Choi47, B. Choudhary23, T. Christiansen25, L. Christofek56, D. Claes65, B. Clément19, C. Clément40, Y. Coadou5, M. Cooke76, W. E. Cooper49, D. Coppage56, M. Corcoran76, A. Cothenet15, M.-C. Cousinou15, B. Cox43, S. Crépé-Renaudin14, D. Cutts73, H. da Motta2, M. Das58, B. Davies41, G. Davies42, G. A. Davis52, K. De74, P. de Jong33, S. J. de Jong34, E. De La Cruz-Burelo32, C. De Oliveira Martins3, S. Dean43, J. D. Degenhardt62, F. Déliot18, M. Demarteau49, R. Demina68, P. Demine18, D. Denisov49, S. P. Denisov38, S. Desai69, H. T. Diehl49, M. Diesburg49, M. Doidge41, H. Dong69, S. Doulas61, L. V. 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Sawyer58, T. Scanlon42, D. Schaile25, R. D. Schamberger69, H. Schellman52, P. Schieferdecker25, C. Schmitt26, C. Schwanenberger22, A. Schwartzman66, R. Schwienhorst63, S. Sengupta48, H. Severini72, E. Shabalina50, M. Shamim57, V. Shary18, A. A. Shchukin38, W. D. Shephard54, R. K. Shivpuri28, D. Shpakov61, R. A. Sidwell57, V. Simak10, V. Sirotenko49, P. Skubic72, P. Slattery68, R. P. Smith49, K. Smolek10, G. R. Snow65, J. Snow71, S. Snyder70, S. Söldner-Rembold43, X. Song51, L. Sonnenschein17, A. Sopczak41, M. Sosebee74, K. Soustruznik9, M. Souza2, B. Spurlock74, N. R. Stanton57, J. Stark14, J. Steele58, K. Stevenson53, V. Stolin36, A. Stone50, D. A. Stoyanova38, J. Strandberg40, M. A. Strang74, M. Strauss72, R. Ströhmer25, D. Strom52, M. Strovink45, L. Stutte49, S. Sumowidagdo48, A. Sznajder3, M. Talby57, P. Tamburello44, W. Taylor5, P. Telford43, J. Temple44, M. Tomoto49, T. Toole59, J. Torborg54, S. Towers69, T. Trefzger24, S. Trincaz-Duvoid17, B. Tuchming18, C. Tully66, A. S. Turcot43, P. M. Tuts67, L. Uvarov39, S. Uvarov39, S. Uzunyan51, B. Vachon5, R. Van Kooten53, W. M. van Leeuwen33, N. Varelas50, E. W. Varnes44, A. Vartapetian74, I. A. Vasilyev38, M. Vaupel26, P. Verdier20, L. S. Vertogradov35, M. Verzocchi59, F. Villeneuve-Seguier42, J.-R. Vlimant17, E. Von Toerne57, M. Vreeswijk33, T. Vu Anh16, H. D. Wahl48, L. Wang59, J. Warchol54, G. Watts78, M. Wayne54, M. Weber49, H. Weerts63, N. Wermes22, A. White74, V. White49, D. Wicke49, D. A. Wijngaarden34, G. W. Wilson56, S. J. Wimpenny47, J. Wittlin60, M. Wobisch49, J. Womersley49, D. R. Wood61, T. R. Wyatt43, Q. Xu62, N. Xuan54, S. Yacoob52, R. Yamada49, M. Yan59, T. Yasuda49, Y. A. Yatsunenko35, Y. Yen26, K. Yip70, H. D. Yoo73, S. W. Youn52, J. Yu74, A. Yurkewicz69, A. Zabi16, A. Zatserklyaniy51, M. Zdrazil69, C. Zeitnitz24, D. Zhang49, X. Zhang72, T. Zhao78, Z. Zhao62, B. Zhou62, J. Zhu69, M. Zielinski68, D. Zieminska53, A. Zieminski53, R. Zitoun69, V. Zutshi51, and E. G. Zverev37 (D0 Collaboration)
1Universidad de Buenos Aires, Buenos Aires, Argentina
2LAFEX, Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil
3Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
4Instituto de Física Teórica, Universidade Estadual Paulista, São Paulo, Brazil
5University of Alberta, Edmonton, Alberta, Canada, Simon Fraser University, Burnaby, British Columbia, Canada, York University, Toronto, Ontario, Canada, and McGill University, Montreal, Quebec, Canada
6Institute of High Energy Physics, Beijing, People’s Republic of China
7University of Science and Technology of China, Hefei, People’s Republic of China
8Universidad de los Andes, Bogotá, Colombia
9Center for Particle Physics, Charles University, Prague, Czech Republic
10Czech Technical University, Prague, Czech Republic
11Center for Particle Physics, Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
12Universidad San Francisco de Quito, Quito, Ecuador
13Laboratoire de Physique Corpusculaire, IN2P3-CNRS, Université Blaise Pascal, Clermont-Ferrand, France
14Laboratoire de Physique Subatomique et de Cosmologie, IN2P3-CNRS, Universite de Grenoble 1, Grenoble, France
15CPPM, IN2P3-CNRS, Université de la Méditerranée, Marseille, France
16IN2P3-CNRS, Laboratoire de l’Accélérateur Linéaire, Orsay, France
17LPNHE, IN2P3-CNRS, Universités Paris VI and VII, Paris, France
18DAPNIA/Service de Physique des Particules, CEA, Saclay, France
19IReS, IN2P3-CNRS, Université Louis Pasteur, Strasbourg, France, and Université de Haute Alsace, Mulhouse, France
20Institut de Physique Nucléaire de Lyon, IN2P3-CNRS, Université Claude Bernard, Villeurbanne, France
21Physikalisches Institut A, RWTH Aachen, Aachen, Germany
22Physikalisches Institut, Universität Bonn, Bonn, Germany
23Physikalisches Institut, Universität Freiburg, Freiburg, Germany
24Institut für Physik, Universität Mainz, Mainz, Germany
25Ludwig-Maximilians-Universität München, München, Germany
26Fachbereich Physik, University of Wuppertal, Wuppertal, Germany
27Panjab University, Chandigarh, India
28Delhi University, Delhi, India
29Tata Institute of Fundamental Research, Mumbai, India
30University College Dublin, Dublin, Ireland
31Korea Detector Laboratory, Korea University, Seoul, Korea
32CINVESTAV, Mexico City, Mexico
33FOM-Institute NIKHEF and University of Amsterdam/NIKHEF, Amsterdam, The Netherlands
34Radboud University Nijmegen/NIKHEF, Nijmegen, The Netherlands
35Joint Institute for Nuclear Research, Dubna, Russia
36Institute for Theoretical and Experimental Physics, Moscow, Russia
37Moscow State University, Moscow, Russia
38Institute for High Energy Physics, Protvino, Russia
39Petersburg Nuclear Physics Institute, St. Petersburg, Russia
40Lund University, Lund, Sweden, Royal Institute of Technology, and Stockholm University, Stockholm, Sweden, and Uppsala University, Uppsala, Sweden
41Lancaster University, Lancaster, United Kingdom
42Imperial College, London, United Kingdom
43University of Manchester, Manchester, United Kingdom
44University of Arizona, Tucson, Arizona 85721, U.S.A.
45Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, U.S.A.
46California State University, Fresno, California 93740, U.S.A.
47University of California, Riverside, California 92521, U.S.A.
48Florida State University, Tallahassee, Florida 32306, U.S.A.
49Fermi National Accelerator Laboratory, Batavia, Illinois 60510, U.S.A.
50University of Illinois at Chicago, Chicago, Illinois 60607, U.S.A.
51Northern Illinois University, DeKalb, Illinois 60115, U.S.A.
52Northwestern University, Evanston, Illinois 60208, U.S.A.
53Indiana University, Bloomington, Indiana 47405, U.S.A.
54University of Notre Dame, Notre Dame, Indiana 46556, U.S.A.
55Iowa State University, Ames, Iowa 50011, U.S.A.
56University of Kansas, Lawrence, Kansas 66045, U.S.A.
57Kansas State University, Manhattan, Kansas 66506, U.S.A.
58Louisiana Tech University, Ruston, Louisiana 71272, U.S.A.
59University of Maryland, College Park, Maryland 20742, U.S.A.
60Boston University, Boston, Massachusetts 02215, U.S.A.
61Northeastern University, Boston, Massachusetts 02115, U.S.A.
62University of Michigan, Ann Arbor, Michigan 48109, U.S.A.
63Michigan State University, East Lansing, Michigan 48824, U.S.A.
64University of Mississippi, University, Mississippi 38677, U.S.A.
65University of Nebraska, Lincoln, Nebraska 68588, U.S.A.
66Princeton University, Princeton, New Jersey 08544, U.S.A.
67Columbia University, New York, New York 10027, U.S.A.
68University of Rochester, Rochester, New York 14627, U.S.A.
69State University of New York, Stony Brook, New York 11794, U.S.A.
70Brookhaven National Laboratory, Upton, New York 11973, U.S.A.
71Langston University, Langston, Oklahoma 73050, U.S.A.
72University of Oklahoma, Norman, Oklahoma 73019, U.S.A.
73Brown University, Providence, Rhode Island 02912, U.S.A.
74University of Texas, Arlington, Texas 76019, U.S.A.
75Southern Methodist University, Dallas, Texas 75275, U.S.A.
76Rice University, Houston, Texas 77005, U.S.A.
77University of Virginia, Charlottesville, Virginia 22901, U.S.A.
78University of Washington, Seattle, Washington 98195, U.S.A.
Received 20 May 2005; published 29 July 2005
We present a measurement of the fraction f+ of right-handed W bosons produced in top quark decays, based on a candidate sample of tt̅ events in the lepton+jets decay mode. These data correspond to an integrated luminosity of 230 pb-1, collected by the D0 detector at the Fermilab Tevatron pp̅ Collider at sqrt[s]=1.96 TeV. We use a constrained fit to reconstruct the kinematics of the tt̅ and decay products, which allows for the measurement of the leptonic decay angle θ* for each event. By comparing the cosθ* distribution from the data with those for the expected background and signal for various values of f+, we find f+=0.00±0.13(stat)±0.07(syst). This measurement is consistent with the standard model prediction of f+=3.6×10-4.
©2005 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevD.72.011104
DOI: 10.1103/PhysRevD.72.011104
PACS: 14.65.Ha, 14.70.Fm, 12.15.Ji, 12.38.Qk
* Visitor from University of Zurich, Zurich, Switzerland.
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