Anomalous B-meson mixing and baryogenesis

作者：Tulin Sean^*; Winslow Peter

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2011, 84(3): 034013.

DOI：10.1103/PhysRevD.84.034013

There exist experimental hints from the B sector for CP violation beyond the standard model (SM) paradigm. An anomalous dimuon asymmetry was reported by the D0 Collaboration, while tension exists between B -> tau nu and S-psi K. These measurements, disfavoring the SM at the similar to 3 sigma level, can be explained by new physics in both B-d(0) - (B) over bar (0)(d) and B-s(0) - (B) over bar (0)(s) mixing, arising from (1) new bosonic degrees of freedom at or near the electroweak scale, and (2) new, large CP-violating phases. These two new physics ingredients are precisely what is required for electroweak baryogenesis to work in an extension of the SM. We show that a simple two Higgs doublet model with top-charm flavor violation can explain the B anomalies and the baryon asymmetry of the Universe. Moreover, the presence of a large relative phase in the top-charm Yukawa coupling, favored by B-d,s(0)-B-d,s(0) mixing, weakens constraints from epsilon(K) and b -> s gamma, allowing for a light charged Higgs mass of O(100 GeV).

• 出版日期2011-8-9