Search for 𝑩𝒔 𝟎 decay to 𝝁 +𝝁 −𝜸 using CMS Detector at the LHC and other Run3 Preparations

	With several recent measurements at the LHC hinting at possible violation of lepton flavor universality in the 𝐵-meson sector, it is crucial to explore more transitions of the type 𝑏 → 𝑠ℓℓ to search for possible deviation(s) from the prediction(s) of the Standard Model (SM). In this context we are developing a strategy to look for the radiative counterpart of the decay 𝐵𝑠 0 → 𝜇 +𝜇 −, viz., 𝐵𝑠 0 → 𝜇 +𝜇 −𝛾 process. The physics beyond SM is likely to affect the above two transitions in varied ways. Hence, the measurement of rates of these two transitions is extremely important. However, identification and analysis of the three-body decay mode is more challenging than the two-body decay mode. During the past data taking periods of Run1 and Run2 there was no suitable trigger condition in place for the CMS experiment to select 𝐵𝑠 0 → 𝜇 +𝜇 −𝛾 process on-line. Hence, we are developing in parallel an analysis strategy to exploit the 𝐵-Parking dataset of Run2. For the upcoming Run3 operations of the LHC we have developed a trigger strategy. Additionally, an inclusive dimuon trigger, extending the dimuon mass range, is also being developed. I shall briefly present my contributions towards these developments. In parallel, I am also involved in deriving the calibrations for the Level-1 trigger objects for the electromagnetic calorimeter. We will discuss the calibration workflow as well.