Neutral gauge boson contributions to the dimuon charge asymmetry in B decays

  • Ashutosh Kumar Alok
  • Seungwon Baek
  • David London
Article

Abstract

Recently, the DØ Collaboration measured the CP-violating like-sign dimuon charge asymmetry in neutral B decays, finding a 3.2σ difference from the standard-model (SM) prediction. Anon-SM charge asymmetry a sl s suggests a new-physics (NP) contribution to \( {B_s} - {\bar{B}_s} \) mixing. In this case, in order to explain the measured value of a sl s within its 1σ range, NP must be present in Γ12 s , the absorptive part of the mixing. In this paper, we examine whether such an explanation is possible in models with flavor-changing Z (ZFCNC) or Z′ (Z′FCNC) gauge bosons. The models must also reproduce the measured values of the indirect CP asymmetry S ψϕ in B s  → J/ψϕ, and ∆Γ s , the \( {B_s} - {\bar{B}_s} \) width difference. We find that the ZFCNC model cannot reproduce the present measured values of S ψϕ and a sl s within their 1σ ranges. On the other hand, in the Z′FCNC model, the values of all three observables can be simultaneously reproduced.

Keywords

Beyond Standard Model B-Physics CP violation 

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Copyright information

© SISSA, Trieste, Italy 2011

Authors and Affiliations

  • Ashutosh Kumar Alok
    • 1
  • Seungwon Baek
    • 2
  • David London
    • 1
  1. 1.Physique des Particules, Université de MontréalMontréalCanada
  2. 2.The Institute of Basic Science and Department of PhysicsKorea UniversitySeoulRepublic of Korea

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