New Physics in B-Bbar mixing in the light of recent LHCb data
Abstract
We perform model-independent statistical analyses of three scenarios accommodating New Physics (NP) in Delta F=2 flavour-changing neutral current amplitudes. In a scenario in which NP in Bd-Bd-bar and Bs-Bs-bar is uncorrelated, we find the parameter point representing the Standard-Model disfavoured by 2.4 standard deviations. However, recent LHCb data on Bs neutral-meson mixing forbid a good accommodation of the D0 data on the semileptonic CP asymmetry ASL. We introduce a fourth scenario with NP in both M12d,s and Gamma12d,s, which can accommodate all data. We discuss the viability of this possibility and emphasise the importance of separate measurements of the CP asymmetries in semileptonic Bd and Bs decays. All results have been obtained with the CKMfitter analysis package, featuring the frequentist statistical approach and using Rfit to handle theoretical uncertainties.
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