Journal of High Energy Physics

, 2010:82

Family non-universal Z′ effects on \( {\bar B_q} - {B_q} \) mixing, BXsμ+μ and Bsμ+μ decays


DOI: 10.1007/JHEP02(2010)082

Cite this article as:
Chang, Q., Lic, XQ. & Yang, YD. J. High Energ. Phys. (2010) 2010: 82. doi:10.1007/JHEP02(2010)082


Motivated by the large discrepancy of CP-violating phase in \( {\bar B_s} - {B_s} \) mixing between the experimental data and the Standard Model prediction, we pursue possible solutions within a family non-universal Z′ model. Within such a specific model, we find that both the \( {\bar B_s} - {B_s} \) mixing anomaly and the well-known “πK puzzle” could be moderated simultaneously with a nontrivial new weak phase, ϕsL ∼ −72° (S1) or −82° (S2). With the stringently constrained Z′ coupling BsbL, we then study the Z′ effects on the rare BXsμ+μ and Bsμ+μ decays, which are also induced by the same bs transition. The observables of BXsμ+μ, at both high and low q2 regions, are found to be able to put strong constraints on the μμZ′ coupling, BμμL,R ∼ 10−2. It is also shown that the combined constraints from \( {\bar B_s} - {B_s} \) mixing, BπK and BXsμ+μ do not allow a large Z′ contribution to the pure leptonic Bsμ+μ decay.


Rare DecaysBeyond Standard ModelB-Physics

Copyright information

© SISSA, Trieste, Italy 2010

Authors and Affiliations

  1. 1.Institute of Particle PhysicsHuazhong Normal UniversityWuhan, HubeiP. R. China
  2. 2.Department of PhysicsHenan Normal UniversityXinxiang, HenanP.R. China
  3. 3.Institut für Theoretische Physik ERWTH Aachen UniversityAachenGermany
  4. 4.Key Laboratory of Quark & Lepton Physics, Ministry of EducationHuazhong Normal UniversityWuhan, HubeiP. R. China