Evidence for an anomalous like-sign dimuon charge asymmetry

Open Access
Authors
  • V.M. Abazov
  • [Unknown] et al.
  • L.S. Ancu
  • S.J. de Jong
  • F. Filthaut
  • P. Houben
  • M.M. Meijer
  • P. Svoisky
Publication date 2010
Journal Physical Review Letters
Volume | Issue number 105 | 8
Pages (from-to) 081801
Number of pages 7
Organisations
  • Faculty of Science (FNWI) - Institute of Physics (IoP) - Institute for High Energy Physics (IHEF)
Abstract We measure the charge asymmetry A =(N++ -N--)/(N++ + N--) 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) = -0.009 57 +/- 0.00251(stat) +/- 0.001 46(sys). It 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.
Document type Article
Language English
Published at https://doi.org/10.1103/PhysRevLett.105.081801
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