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Evidence for an anomalous like-sign dimuon charge asymmetry

V. M. Abazov et al. (D0 Collaboration)
Phys. Rev. D 82, 032001 – Published 16 August 2010
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  • INTRODUCTION
  • MEASUREMENT METHOD
  • DETECTOR AND DATA SELECTION
  • MONTE CARLO SIMULATION
  • MEASUREMENT OF fK, FK
  • MEASUREMENT OF P(πμ)/P(Kμ) AND P(pμ)/
  • MEASUREMENT OF fπ, fp, Fπ, Fp
  • SYSTEMATIC UNCERTAINTIES OF BACKGROUND…
  • MEASUREMENT OF fS, FSS
  • MEASUREMENT OF δ
  • MEASUREMENT OF aK, aπ, ap
  • CORRECTIONS DUE TO BACKGROUND…
  • ASYMMETRIES aS AND AS
  • ASYMMETRY Aslb
  • CONSISTENCY CHECKS
  • COMPARISON WITH EXISTING MEASUREMENTS
  • CONCLUSIONS
  • ACKNOWLEDGEMENTS
  • APPENDICES
  • References
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    Abstract

    We measure the charge asymmetry A of like-sign dimuon events in 6.1fb1 of pp¯ collisions recorded with the D0 detector at a center-of-mass energy s=1.96TeV at the Fermilab Tevatron collider. From A, we extract the like-sign dimuon charge asymmetry in semileptonic b-hadron decays: Aslb=0.00957±0.00251   (stat)±0.00146   (syst). This result differs by 3.2 standard deviations from the standard model prediction Aslb(SM)=(2.30.6+0.5)×104 and provides first evidence of anomalous CP violation in the mixing of neutral B mesons.

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    • Received 16 May 2010

    DOI:dx.doi.org/10.1103/PhysRevD.82.032001

    © 2010 The American Physical Society

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    A new source of CP violation?

    Published 16 August 2010

    Searches for new sources of CP violation are a staple of high-energy physics; a recent result presents an effect that could be a sign of new physics beyond the standard model.

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    Vol. 82, Iss. 3 — 1 August 2010

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