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 2.4 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.
Keywords
Cite
@article{arxiv.1203.0238,
title = {New Physics in B-Bbar mixing in the light of recent LHCb data},
author = {A. Lenz and U. Nierste and J. Charles and S. Descotes-Genon and H. Lacker and S. Monteil and V. Niess and S. T'Jampens},
journal= {arXiv preprint arXiv:1203.0238},
year = {2013}
}
Comments
5 pages, 3 figures. Update including results from LHCb-CONF-2012-002