Study of dimuon rare beauty decays with ATLAS and CMS

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 very 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 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 B_s→μμ signal with ∼5 sigma significance can be measured combining low luminosity 10³³ cm^-2 s^-1 samples with those of one year of LHC operation at a luminosity of 10³⁴ cm^-2 s^-1. PACS 13.30.Ce; 13.20.He