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SUMMARY:Measurement of time-dependent CP violation in B0(s)->J/Psi K-short
  decays with the CMS experiment
DTSTART:20260714T090000Z
DTEND:20260714T100000Z
DTSTAMP:20260910T101300Z
UID:indico-event-1707508@indico.cern.ch
CONTACT:ep-seminars.colloquia@cern.ch
DESCRIPTION:Speakers: Valeriia Lukashenko (University of Zurich (CH))\n\n\
 nTime-dependent CP-violation measurements in neutral B-meson decays provid
 e stringent tests of the Cabibbo–Kobayashi–Maskawa description of flav
 our physics and indirect sensitivity to physics beyond the Standard Model.
  The decay of neutral B0 mesons to J/Psi K-short mesons offers theoretical
 ly clean access to the CKM angle beta\, while the SU(3)-related decay of B
 s mesons to the same final state provides complementary sensitivity to bet
 a_s and to subleading penguin contributions that affect the interpretation
  of precision measurements.This seminar presents a CMS measurement of CP v
 iolation in both decay modes using the full Run 3 dataset collected betwee
 n 2022 and 2025. Approximately 1.4 million B0 and 16 thousand Bs signal de
 cays are reconstructed. Their time evolution is studied using dedicated fl
 avour-tagging algorithms based on state-of-the-art Transformer architectur
 es to determine the production flavour of each candidate. The resulting me
 asurements of mixing-induced and direct CP violation are consistent with s
 tandard model predictions\, reach competitive precision in the B0 channel\
 , and substantially improve the experimental knowledge of the Bs decay.\n
  \n\n \nCoffee will be served at 10h30\n \n\nhttps://indico.cern.ch/eve
 nt/1707508/\n\nZoom: https://cern.zoom.us/j/66705631163?pwd=aRL9ba5Pd5cWbM
 GlQV5gXeBnz4tsQH.1
LOCATION:503/1-001 - Council Chamber (CERN)
URL:https://indico.cern.ch/event/1707508/
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