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Updated Bs -mixing constraints on new physics models for b→sℓ+ℓ− anomalies.

Di Luzio, Luca and Kirk, Matthew and Lenz, Alexander (2018) 'Updated Bs -mixing constraints on new physics models for b→sℓ+ℓ− anomalies.', Physical review D., 97 (9). 095035.


Many new physics models that explain the intriguing anomalies in the b-quark flavor sector are severely constrained by Bs mixing, for which the Standard Model prediction and experiment agreed well until recently. The most recent Flavour Lattice Averaging Group (FLAG) average of lattice results for the nonperturbative matrix elements points, however, in the direction of a small discrepancy in this observable Cabibbo-Kobayashi-Maskawa (CKM). Using up-to-date inputs from standard sources such as PDG, FLAG and one of the two leading CKM fitting groups to determine ΔMSM s , we find a severe reduction of the allowed parameter space of Z0 and leptoquark models explaining the B anomalies. Remarkably, in the former case the upper bound on the Z0 mass approaches dangerously close to the energy scales already probed by the LHC. We finally identify some model-building directions in order to alleviate the tension with Bs mixing.

Item Type:Article
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Publisher statement:Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Date accepted:No date available
Date deposited:07 June 2018
Date of first online publication:25 May 2018
Date first made open access:07 June 2018

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