Study of DiMuon Rare Beauty Decays with ATLAS and CMS

TL;DR

This paper discusses how ATLAS and CMS experiments at the LHC will investigate rare B-hadron decays involving muons, aiming to improve sensitivity to potential new physics beyond the Standard Model through dimuon decay channels.

Contribution

It presents the strategy and expected sensitivity of ATLAS and CMS in measuring rare B-hadron decays with muons, especially B_s to mu mu, at various LHC luminosities.

Findings

Sensitivity in dimuon channels comparable to current measurements at 1 fb^{-1}

Potential to observe B_s to mu mu with 5 sigma significance at higher luminosities

Strategy to extend measurements up to nominal LHC luminosity

Abstract

The LHC experiments will perform sensitive tests of physics beyond the Standard Model (BSM). The investigation of decays of beauty hadrons represents an alternative approach in addition to direct BSM searches. The ATLAS and CMS efforts concentrate on those B-decays that can be efficiently selected already at the first and second level trigger. The most favorable trigger signature will be for $B$-hadron decays with muons in the final state. Using this trigger, ATLAS and CMS will be able to accommodate unprecedentedly high statistics in the rare decay sector. These are purely dimuon decays, and families of semimuonic exclusive channels. Already with data corresponding to an integrated luminosity of \ensuremath{1 fb^{-1}}, the sensitivity in the dimuon channels will be comparable to present measurements (world average). The strategy is to carry on the dimuon channel program up to nominal LHC luminosity. In particular the \ensuremath{B_s \to \mu\mu} signal with \ensuremath{\sim}5 sigma significance can be measured combining low luminosity \ensuremath{10^{33}cm^{-2} s^{-1}} samples with those of one year of LHC operation at a luminosity of \ensuremath{10^{34}cm^{-2} s^{-1}