Measurement of CP-violating parameters in the 𝐁𝐬𝟎→𝐉/𝛙𝛟 decay using proton-proton collisions in the CMS experiment at √𝐬=𝟏𝟑 𝐓𝐞𝐕

by Dr Muhammad Alibordi (Dept. of Physics and Astronomy, Mississippi State University, USA)

Friday 25 Nov 2022, 10:00 → 11:00 Asia/Kolkata

Zoom link: https://cern.zoom.us/j/95212002203?pwd=VmYzQjhpWWpQVHdSUzliVnRjZlVaQT09

This talk will describe the measurement of CP violating parameters in the decay process of B_s^O→J/ψ(→μ⁺μ⁻)ϕ(→K⁺K⁻). The study is based on proton-proton collision data collected during 2017–2018 by the CMS experiment at √s=13 TeV, corresponding to an integrated luminosity of 96.4 fb⁻¹. The angular analysis of the decay process mainly focuses on the measurement of the weak phase ϕ_s; it also extracts the oscillation frequency (Δm_s), the difference in the decay width between the B_s mass eigenstates (ΔΓ_s), and the direct CP-violating parameter (λ). The results of the measurement at 13 TeV are combined with those at 8 TeV leading to significant improvements.