Rare decays at the Lhc

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 to direct BSM searches. The ATLAS and CMS efforts concentrate on B-decays with muons in the final state, that can be efficiently selected by the multiple-level triggers. These include pure dimuon decays, and families of semi-muonic exclusive channels. Lhc b is the only Lhc experiment completely devoted to the study of b-hadrons physics. Its target will be performing precise measurements of C P violation and rare b-hadron decays. Thanks to the high statistics of b-hadrons and good momentum resolutions, Lhc b can play a crucial role in indirect New Physics searches.