2010/10/29 by Ashutosh Kumar Alok, Seungwon Baek, David London · 33 citations
Physics and Astronomy · #Asymmetry #Boson #CP violation #Charge (physics) #Gauge (firearms) #Gauge boson #Gauge theory #High-Energy Particle Collisions Research #Mixing (physics) #Nuclear physics #Observable #Order (exchange) #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Sign (mathematics) #Standard Model (mathematical formulation) #hep-ph
paper · pdf · doi:10.1007/jhep07(2011)111
published in Journal of High Energy Physics 2011(7) (Springer Nature) · 18 pages, 7 figures, JHEP format. Some ZFCNC equations corrected, ZFCNC analysis redone, references added, conclusions unchanged
arxiv created 2010/10/29 · openalex publication_date 2011/07/01 · arxiv updated 2011/07/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Recently, the D0 Collaboration measured the CP-violating like-sign dimuon charge asymmetry in neutral B decays, finding a 3.2sigma difference from the standard-model (SM) prediction. A non-SM charge asymmetry asls suggests a new-physics (NP) contribution to Bs-Bsbar mixing. In this case, in order to explain the measured value of asls within its 1sigma range, NP must be present in Gamma12s, 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 Spsi-phi in Bs -> J/psi phi, and Delta Gammas, the Bs-Bsbar width difference. We find that the ZFCNC model cannot reproduce the present measured values of Spsi-phi and asls within their 1sigma ranges. On the other hand, in the Z'FCNC model, the values of all three observables can be simultaneously reproduced.