English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

In this letter, we consider the constraints imposed by the recent measurementof B_s - bar B_s mixing on the new physics contribution to the rare decay B_s--> mu+ mu-. New physics in the form vector and axial-vector couplings isalready severely constrained by the data on B --> (K,K*) mu+ mu-. Here, we showthat B_s - bar B_s mixing data, together with the data on K0 - bar K0 mixingand K_L --> mu+ mu- decay rate, strongly constrain the scalar-pseudoscalarcontribution to B_s --> mu+ mu-. We conclude that new physics can at best leadto a factor of 2 increase in the branching ratio of B_s --> mu+ mu- compared toits Standard Model expectation.

Does the present data on B_s - bar B_s mixing rule out a large enhancement in the branching ratio of B_s --> mu+ mu- ?