Phys. Rev. Lett.
105,
081801
(2010)
[7 pages]
Evidence for an Anomalous Like-Sign Dimuon Charge Asymmetry
V. M. Abazov et al. (D0 Collaboration)
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V. M. Abazov36, B. Abbott74, M. Abolins63, B. S. Acharya29, M. Adams49, T. Adams47, E. Aguilo6, G. D. Alexeev36, G. Alkhazov40, A. Alton62,*, G. Alverson61, G. A. Alves2, L. S. Ancu35, M. Aoki48, Y. Arnoud14, M. Arov58, A. Askew47, B. Åsman41, O. Atramentov66, C. Avila8, J. BackusMayes81, F. Badaud13, L. Bagby48, B. Baldin48, D. V. Bandurin47, S. Banerjee29, E. Barberis61, A.-F. Barfuss15, P. Baringer56, J. Barreto2, J. F. Bartlett48, U. Bassler18, S. Beale6, A. Bean56, M. Begalli3, M. Begel72, C. Belanger-Champagne41, L. Bellantoni48, J. A. Benitez63, S. B. Beri27, G. Bernardi17, R. Bernhard22, I. Bertram42, M. Besançon18, R. Beuselinck43, V. A. Bezzubov39, P. C. Bhat48, V. Bhatnagar27, G. Blazey50, S. Blessing47, K. Bloom65, A. Boehnlein48, D. Boline71, T. A. Bolton57, E. E. Boos38, G. Borissov42, T. Bose60, A. Brandt77, R. Brock63, G. Brooijmans69, A. Bross48, D. Brown19, X. B. Bu7, D. Buchholz51, M. Buehler80, V. Buescher24, V. Bunichev38, S. Burdin42,†, T. H. Burnett81, C. P. Buszello43, P. Calfayan25, B. Calpas15, S. Calvet16, E. Camacho-Pérez33, J. Cammin70, M. A. Carrasco-Lizarraga33, E. Carrera47, B. C. K. Casey48, H. Castilla-Valdez33, S. Chakrabarti71, D. Chakraborty50, K. M. Chan54, A. Chandra79, G. Chen56, S. Chevalier-Théry18, D. K. Cho76, S. W. Cho31, S. Choi32, B. Choudhary28, T. Christoudias43, S. Cihangir48, D. Claes65, J. Clutter56, M. Cooke48, W. E. Cooper48, M. Corcoran79, F. Couderc18, M.-C. Cousinou15, A. Croc18, D. Cutts76, M. Ćwiok30, A. Das45, G. Davies43, K. De77, S. J. de Jong35, E. De La Cruz-Burelo33, F. Déliot18, M. Demarteau48, R. Demina70, D. Denisov48, S. P. Denisov39, S. Desai48, K. DeVaughan65, H. T. Diehl48, M. Diesburg48, A. Dominguez65, T. Dorland81, A. Dubey28, L. V. Dudko38, D. Duggan66, A. Duperrin15, S. Dutt27, A. Dyshkant50, M. Eads65, D. Edmunds63, J. Ellison46, V. D. Elvira48, Y. Enari17, S. Eno59, H. Evans52, A. Evdokimov72, V. N. Evdokimov39, G. Facini61, A. V. Ferapontov76, T. Ferbel59,70, F. Fiedler24, F. Filthaut35, W. Fisher63, H. E. Fisk48, M. Fortner50, H. Fox42, S. Fuess48, T. Gadfort72, A. Garcia-Bellido70, V. Gavrilov37, P. Gay13, W. Geist19, W. Geng15,63, D. Gerbaudo67, C. E. Gerber49, Y. Gershtein66, D. Gillberg6, G. Ginther48,70, G. Golovanov36, A. Goussiou81, P. D. Grannis71, S. Greder19, H. Greenlee48, Z. D. Greenwood58, E. M. Gregores4, G. Grenier20, Ph. Gris13, J.-F. Grivaz16, A. Grohsjean18, S. Grünendahl48, M. W. Grünewald30, F. Guo71, J. Guo71, G. Gutierrez48, P. Gutierrez74, A. Haas69,‡, P. Haefner25, S. Hagopian47, J. Haley61, I. Hall63, L. Han7, K. Harder44, A. Harel70, J. M. Hauptman55, J. Hays43, T. Hebbeker21, D. Hedin50, A. P. Heinson46, U. Heintz76, C. Hensel23, I. Heredia-De La Cruz33, K. Herner62, G. Hesketh61, M. D. Hildreth54, R. Hirosky80, T. Hoang47, J. D. Hobbs71, B. Hoeneisen12, M. Hohlfeld24, S. Hossain74, P. Houben34, Y. Hu71, Z. Hubacek10, N. Huske17, V. Hynek10, I. Iashvili68, R. Illingworth48, A. S. Ito48, S. Jabeen76, M. Jaffré16, S. Jain68, D. Jamin15, R. Jesik43, K. Johns45, C. Johnson69, M. Johnson48, D. Johnston65, A. Jonckheere48, P. Jonsson43, A. Juste48,§, K. Kaadze57, E. Kajfasz15, D. Karmanov38, P. A. Kasper48, I. Katsanos65, R. Kehoe78, S. Kermiche15, N. Khalatyan48, A. Khanov75, A. Kharchilava68, Y. N. Kharzheev36, D. Khatidze76, M. H. Kirby51, M. Kirsch21, J. M. Kohli27, A. V. Kozelov39, J. Kraus63, A. Kumar68, A. Kupco11, T. Kurča20, V. A. Kuzmin38, J. Kvita9, S. Lammers52, G. Landsberg76, P. Lebrun20, H. S. Lee31, W. M. Lee48, J. Lellouch17, L. Li46, Q. Z. Li48, S. M. Lietti5, J. K. Lim31, D. Lincoln48, J. Linnemann63, V. V. Lipaev39, R. Lipton48, Y. Liu7, Z. Liu6, A. Lobodenko40, M. Lokajicek11, P. Love42, H. J. Lubatti81, R. Luna-Garcia33,**, A. L. Lyon48, A. K. A. Maciel2, D. Mackin79, R. Madar18, R. Magaña-Villalba33, P. K. Mal45, S. Malik65, V. L. Malyshev36, Y. Maravin57, J. Martínez-Ortega33, R. McCarthy71, C. L. McGivern56, M. M. Meijer35, A. Melnitchouk64, D. Menezes50, P. G. Mercadante4, M. Merkin38, A. Meyer21, J. Meyer23, N. K. Mondal29, T. Moulik56, G. S. Muanza15, M. Mulhearn80, E. Nagy15, M. Naimuddin28, M. Narain76, R. Nayyar28, H. A. Neal62, J. P. Negret8, P. Neustroev40, H. Nilsen22, S. F. Novaes5, T. Nunnemann25, G. Obrant40, D. Onoprienko57, J. Orduna33, N. Osman43, J. Osta54, G. J. Otero y Garzón1, M. Owen44, M. Padilla46, M. Pangilinan76, N. Parashar53, V. Parihar76, S.-J. Park23, S. K. Park31, J. Parsons69, R. Partridge76,‡, N. Parua52, A. Patwa72, B. Penning48, M. Perfilov38, K. Peters44, Y. Peters44, G. Petrillo70, P. Pétroff16, R. Piegaia1, J. Piper63, M.-A. Pleier72, P. L. M. Podesta-Lerma33,††, V. M. Podstavkov48, M.-E. Pol2, P. Polozov37, A. V. Popov39, M. Prewitt79, D. Price52, S. Protopopescu72, J. Qian62, A. Quadt23, B. Quinn64, M. S. Rangel16, K. Ranjan28, P. N. Ratoff42, I. Razumov39, P. Renkel78, P. Rich44, M. Rijssenbeek71, I. Ripp-Baudot19, F. Rizatdinova75, M. Rominsky48, C. Royon18, P. Rubinov48, R. Ruchti54, G. Safronov37, G. Sajot14, A. Sánchez-Hernández33, M. P. Sanders25, B. Sanghi48, G. Savage48, L. Sawyer58, T. Scanlon43, D. Schaile25, R. D. Schamberger71, Y. Scheglov40, H. Schellman51, T. Schliephake26, S. Schlobohm81, C. Schwanenberger44, R. Schwienhorst63, J. Sekaric56, H. Severini74, E. Shabalina23, V. Shary18, A. A. Shchukin39, R. K. Shivpuri28, V. Simak10, V. Sirotenko48, P. Skubic74, P. Slattery70, D. Smirnov54, G. R. Snow65, J. Snow73, S. Snyder72, S. Söldner-Rembold44, L. Sonnenschein21, A. Sopczak42, M. Sosebee77, K. Soustruznik9, B. Spurlock77, J. Stark14, V. Stolin37, D. A. Stoyanova39, M. A. Strang68, E. Strauss71, M. Strauss74, R. Ströhmer25, D. Strom49, L. Stutte48, P. Svoisky35, M. Takahashi44, A. Tanasijczuk1, W. Taylor6, B. Tiller25, M. Titov18, V. V. Tokmenin36, D. Tsybychev71, B. Tuchming18, C. Tully67, P. M. Tuts69, R. Unalan63, L. Uvarov40, S. Uvarov40, S. Uzunyan50, R. Van Kooten52, W. M. van Leeuwen34, N. Varelas49, E. W. Varnes45, I. A. Vasilyev39, P. Verdier20, L. S. Vertogradov36, M. Verzocchi48, M. Vesterinen44, D. Vilanova18, P. Vint43, P. Vokac10, H. D. Wahl47, M. H. L. S. Wang70, J. Warchol54, G. Watts81, M. Wayne54, G. Weber24, M. Weber48,‡‡, M. Wetstein59, A. White77, D. Wicke24, M. R. J. Williams42, G. W. Wilson56, S. J. Wimpenny46, M. Wobisch58, D. R. Wood61, T. R. Wyatt44, Y. Xie48, C. Xu62, S. Yacoob51, R. Yamada48, W.-C. Yang44, T. Yasuda48, Y. A. Yatsunenko36, Z. Ye48, H. Yin7, K. Yip72, H. D. Yoo76, S. W. Youn48, J. Yu77, S. Zelitch80, T. Zhao81, B. Zhou62, J. Zhu71, M. Zielinski70, D. Zieminska52, and L. Zivkovic69 (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
4Universidade Federal do ABC, Santo André, Brazil
5Instituto de Física Teórica, Universidade Estadual Paulista, São Paulo, Brazil
6Simon Fraser University, Vancouver, British Columbia, and York University, Toronto, Ontario, Canada
7University of Science and Technology of China, Hefei, People’s Republic of China
8Universidad de los Andes, Bogotá, Colombia
9Charles University, Faculty of Mathematics and Physics, Center for Particle Physics, Prague, Czech Republic
10Czech Technical University in Prague, 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
13LPC, Université Blaise Pascal, CNRS/IN2P3, Clermont, France
14LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, Grenoble, France
15CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France
16LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
17LPNHE, Universités Paris VI and VII, CNRS/IN2P3, Paris, France
18CEA, Irfu, SPP, Saclay, France
19IPHC, Université de Strasbourg, CNRS/IN2P3, Strasbourg, France
20IPNL, Université Lyon 1, CNRS/IN2P3, Villeurbanne, France and Université de Lyon, Lyon, France
21III. Physikalisches Institut A, RWTH Aachen University, Aachen, Germany
22Physikalisches Institut, Universität Freiburg, Freiburg, Germany
23II. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany
24Institut für Physik, Universität Mainz, Mainz, Germany
25Ludwig-Maximilians-Universität München, München, Germany
26Fachbereich Physik, Bergische Universität 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
32SungKyunKwan University, Suwon, Korea
33CINVESTAV, Mexico City, Mexico
34FOM-Institute NIKHEF and University of Amsterdam/NIKHEF, Amsterdam, The Netherlands
35Radboud University Nijmegen/NIKHEF, Nijmegen, The Netherlands
36Joint Institute for Nuclear Research, Dubna, Russia
37Institute for Theoretical and Experimental Physics, Moscow, Russia
38Moscow State University, Moscow, Russia
39Institute for High Energy Physics, Protvino, Russia
40Petersburg Nuclear Physics Institute, St. Petersburg, Russia
41Stockholm University, Stockholm and Uppsala University, Uppsala, Sweden
42Lancaster University, Lancaster LA1 4YB, United Kingdom
43Imperial College London, London SW7 2AZ, United Kingdom
44The University of Manchester, Manchester M13 9PL, United Kingdom
45University of Arizona, Tucson, Arizona 85721, USA
46University of California Riverside, Riverside, California 92521, USA
47Florida State University, Tallahassee, Florida 32306, USA
48Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
49University of Illinois at Chicago, Chicago, Illinois 60607, USA
50Northern Illinois University, DeKalb, Illinois 60115, USA
51Northwestern University, Evanston, Illinois 60208, USA
52Indiana University, Bloomington, Indiana 47405, USA
53Purdue University Calumet, Hammond, Indiana 46323, USA
54University of Notre Dame, Notre Dame, Indiana 46556, USA
55Iowa State University, Ames, Iowa 50011, USA
56University of Kansas, Lawrence, Kansas 66045, USA
57Kansas State University, Manhattan, Kansas 66506, USA
58Louisiana Tech University, Ruston, Louisiana 71272, USA
59University of Maryland, College Park, Maryland 20742, USA
60Boston University, Boston, Massachusetts 02215, USA
61Northeastern University, Boston, Massachusetts 02115, USA
62University of Michigan, Ann Arbor, Michigan 48109, USA
63Michigan State University, East Lansing, Michigan 48824, USA
64University of Mississippi, University, Mississippi 38677, USA
65University of Nebraska, Lincoln, Nebraska 68588, USA
66Rutgers University, Piscataway, New Jersey 08855, USA
67Princeton University, Princeton, New Jersey 08544, USA
68State University of New York, Buffalo, New York 14260, USA
69Columbia University, New York, New York 10027, USA
70University of Rochester, Rochester, New York 14627, USA
71State University of New York, Stony Brook, New York 11794, USA
72Brookhaven National Laboratory, Upton, New York 11973, USA
73Langston University, Langston, Oklahoma 73050, USA
74University of Oklahoma, Norman, Oklahoma 73019, USA
75Oklahoma State University, Stillwater, Oklahoma 74078, USA
76Brown University, Providence, Rhode Island 02912, USA
77University of Texas, Arlington, Texas 76019, USA
78Southern Methodist University, Dallas, Texas 75275, USA
79Rice University, Houston, Texas 77005, USA
80University of Virginia, Charlottesville, Virginia 22901, USA
81University of Washington, Seattle, Washington 98195, USA
 
Received 2 July 2010; published 16 August 2010
See accompanying
Physics
Viewpoint
We measure the charge asymmetry A≡(N++-N--)/(N+++N--) of like-sign dimuon events in 6.1 fb-1 of pp̅ collisions recorded with the D0 detector at a center-of-mass energy √s=1.96 TeV at the Fermilab Tevatron collider. From A we extract the like-sign dimuon charge asymmetry in semileptonic b-hadron decays: Aslb=-0.009 57±0.002 51(stat)±0.001 46(sys). It differs by 3.2 standard deviations from the standard model prediction Aslb(SM)=(-2.3-0.6+0.5)×10-4, and provides first evidence of anomalous CP violation in the mixing of neutral B mesons.
© 2010 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.105.081801
DOI:
10.1103/PhysRevLett.105.081801
PACS:
13.20.He, 11.30.Er, 14.40.Nd
*Visitor from Augustana College, Sioux Falls, SD, USA. †Visitor from The University of Liverpool, Liverpool, U.K. ‡Visitor from SLAC, Menlo Park, CA, USA. §Visitor from ICREA/IFAE, Barcelona, Spain. **Visitor from Centro de Investigacion en Computacion–IPN, Mexico City, Mexico. ††Visitor from ECFM, Universidad Autonoma de Sinaloa, Culiacán, Mexico. ‡‡Visitor from Universität Bern, Bern, Switzerland.
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