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Evidence for an anomalous like-sign dimuon charge asymmetry

Research output: Contribution to journalJournal article

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  • V. M. Abazov
  • B. Abbott
  • M. Abolins
  • B. S. Acharya
  • M. Adams
  • T. Adams
  • E. Aguilo
  • G. D. Alexeev
  • G. Alkhazov
  • A. Alton
  • G. Alverson
  • G. A. Alves
  • L. S. Ancu
  • M. Aoki
  • Y. Arnoud
  • M. Arov
  • A. Askew
  • B. Asman
  • O. Atramentov
  • C. Avila
  • J. BackusMayes
  • F. Badaud
  • L. Bagby
  • B. Baldin
  • D. V. Bandurin
  • S. Banerjee
  • E. Barberis
  • A. -F. Barfuss
  • P. Baringer
  • J. Barreto
  • J. F. Bartlett
  • U. Bassler
  • S. Beale
  • A. Bean
  • M. Begalli
  • M. Begel
  • C. Belanger-Champagne
  • L. Bellantoni
  • J. A. Benitez
  • S. B. Beri
  • G. Bernardi
  • I. Bertram
  • G. Borissov
  • G. Davies
  • H. Fox
  • M. Johnson
  • P. Love
  • D. Price
  • A. Sopczak
  • Mark Williams
  • D0 Collaboration
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Article number032001
<mark>Journal publication date</mark>16/08/2010
<mark>Journal</mark>Physical Review D
Issue number3
Volume82
Number of pages30
Publication statusPublished
Original languageEnglish

Abstract

We measure the charge asymmetry A of like-sign dimuon events in 6.1 fb(-1) of p (p) over bar collisions recorded with the D0 detector at a center-of-mass energy root s = 1.96 TeV at the Fermilab Tevatron collider. From A, we extract the like-sign dimuon charge asymmetry in semileptonic b-hadron decays: A(sl)(b) = -0.00957 +/- 0.00251 (stat) +/- 0.00146 (syst). This result differs by 3.2 standard deviations from the standard model prediction A(sl)(b)(SM) = (-2.3(0.6)(+0.5)) x 10(-4) and provides first evidence of anomalous CP violation in the mixing of neutral B mesons.

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© 2010 The American Physical Society