The beauty of the rare: $B_{(s)}\rightarrow \mu^{+} \mu ^{-}$ at the LHCb

TL;DR

This paper reports the most precise measurement of the rare decay $B_s^0 ightarrow \mu^+ \mu^-$ at LHCb, confirming Standard Model predictions and setting new upper limits for $B^0 ightarrow \mu^+ \\mu^-$.

Contribution

The paper provides the most precise single-experiment measurement of the $B_s^0 ightarrow \\mu^+ \\mu^-$ branching fraction using full Run 1 and 2 data, improving the accuracy of rare decay studies.

Findings

Measured $B_s^0 ightarrow \\mu^+ \\mu^-$ branching fraction with high precision.

Set a new upper limit for $B^0 ightarrow \\mu^+ \\mu^-$ decay.

Results agree with Standard Model predictions.

Abstract

The latest and improved measurements in $B^0_{(s)}\rightarrow\mu^+ \mu^-$ processes have been performed by LHCb using full Run 1 and Run 2 data. The measurement of the branching fraction of $B^0_{s}\rightarrow\mu^+ \mu^-$ is presented as the most precise single experiment measurement of such a rare process. While no significant excess is found for $B^0\rightarrow\mu^+ \mu^-$, an stringent upper limit is set for its braching fraction. Both results are in agreement with SM predictions and with previous results.