Seminarium Fizyki Wielkich Energii

Rare decays of b mesons can be used as a test of the Standard Model. The Large Hadron Collider at CERN, and the CMS detector provide a great experimental setup for searches for such rare decays. In this talk I will give an overview of the flagship analysis of the rare b decays group at CMS, the Bs to mu+ mu-. I will discuss the motivation behind the search, the analysis strategy, methods used and the results. Afterwards I will move on to the yet undiscovered rare decay channel of the Bs meson, the Bs to mu+ mu- gamma, that is the main topic of my PhD project. I will discuss the main challenges in the analysis and the progress made so far.