Reconciling anomalous measurements in Bs − B̅s mixing: the role of CPT-conserving and CPT-violating new physics

Dighe, Amol ; Ghosh, Diptimoy ; Kundu, Anirban ; Patra, Sunando Kumar (2011) Reconciling anomalous measurements in Bs − B̅s mixing: the role of CPT-conserving and CPT-violating new physics Physical Review D, 84 (5). Article ID 056008. ISSN 0556-2821

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Official URL: http://journals.aps.org/prd/abstract/10.1103/PhysR...

Related URL: http://dx.doi.org/10.1103/PhysRevD.84.056008

Abstract

Recently observed anomalies in the Bs→J/ψφ decay and the like-sign dimuon asymmetry Absl hint at possible new physics (NP) in the Bs − B̅s mixing. We parameterize the NP with four model-independent quantities: the magnitudes and phases of the dispersive part M12 and the absorptive part Γ12 of the NP contribution to the effective Hamiltonian. We constrain these parameters using the four observables ΔMs, Γs, the mixing phase βsJ/ψφ, and Absl. Our quantitative fit indicates that the NP should contribute a significant dispersive as well as absorptive part. In fact, models that do not contribute a new absorptive part are disfavored at more than 99% confidence level. We extend this formalism to include CPT violation, and show that CPT violation by itself, or even in presence of CPT-conserving new physics without an absorptive part, helps only marginally in the simultaneous resolution of these anomalies. The NP absorptive contribution to Bs − B̅s mixing therefore seems to be essential, and would imply a large branching fraction for channels like Bs→ τ+τ.

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