Prospects of CMS in B Physics in Phase 2

Abstract

The Standard Model (SM) of Particle Physics precisely predicts the cross-sections for the extremely rare Flavour Changing Neutral Current (FCNC) processes $B_{d/s}\rightarrow \mu \mu$. Although, these processes are suppressed in the SM, beyond Standard Model (BSM) contributions can significantly enhance their decay rates. Therefore, a precise measurement of branching fractions and the $B_s\rightarrow \mu \mu$ lifetime is of prime concern for experiments like CMS in the quest for new physics. The SM also precisely predicts the CP violating phase $\phi _s$ in the $B_s\rightarrow \phi \phi \rightarrow$4 kaons decay process. Any significant deviation from the SM prediction for this rare FCNC process would provide a clear signature for BSM. During the High Luminosity (HL) period of the LHC, also known as LHC Phase-2, CMS will continue to look for $B_{d/s}\rightarrow \mu \mu$ and will also study $B_s\rightarrow \phi \phi \rightarrow$ 4 kaons. The latter will be possible for the first time in CMS due to inclusion of the tracking information in the Level-1 trigger. In this article, we shall discuss the CMS Phase-2 Tracker, Level 1 Tracking and present results obtained from Phase-2 simulations for $B_{d/s}\rightarrow \mu \mu$ and $B_s\rightarrow \phi \phi \rightarrow$ 4 kaons.

Rajarshi Bhattacharya—On behalf of the CMS Collaboration.