PoS - Proceedings of Science
Volume 382 - The Eighth Annual Conference on Large Hadron Collider Physics (LHCP2020) - Session : Flavour Physics
Measurement of the CP-violating phase phi_s in the Bs -> J/Psi phi channel at 13 TeV by CMS
A. Bragagnolo* on behalf of the CMS collaboration
*corresponding author
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Pre-published on: October 13, 2020
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Abstract
These proceedings present the measurement of the weak CP-violating phase $\phi_s$ in the $B_s^0\to J/\psi\,\phi(1020)$ decay channel at $\sqrt{s} = 13$ TeV with the CMS experiment.
The measurement is based on a data sample corresponding to an integrated luminosity of 96.4 fb$^{-1}$, collected in 2017--2018. This analysis employs a dedicated tagging trigger and a novel opposite-side muon flavor tagger based on deep learning techniques. The decay width (mass) difference $\Delta\Gamma_s$ ($\Delta m_s$) between the light and heavy $B_s^0$ mass eigenstates, the $B_s^0$ average decay width $\Gamma_s$ and the CP violation observable $\left| \lambda \right|$ are also measured. The combination with the results obtained by CMS at $\sqrt{s}=8$ TeV is also presented.
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