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Constraints on 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 B_d-B_d-bar and B_s-B_s-bar is uncorrelated, we find the parameter point representing the Standard-Model disfavoured by 2.7 standard deviations. However, recent LHCb data on B_s neutral-meson mixing forbid a good accommodation of the D0 data on the semileptonic CP asymmetry A_SL. We introduce a fourth scenario with NP in both M_12^d,s and Gamma_12^d,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 B_d and B_s 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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http://hal.in2p3.fr/in2p3-00675991
Contributor : Claudine Bombar <>
Submitted on : Friday, March 2, 2012 - 3:25:45 PM
Last modification on : Thursday, February 25, 2021 - 10:58:32 AM

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A. Lenz, U. Nierste, Jérôme Charles, S. Descotes-Genon, H. Lacker, et al.. Constraints on new physics in B-Bbar mixing in the light of recent LHCb data. Physical Review D, American Physical Society, 2012, 86, pp.033008. ⟨10.1103/PhysRevD.86.033008⟩. ⟨in2p3-00675991⟩

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