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SUMMARY:Measurement of the Branching Fraction Ratio of $\\Xi^{-}_b$ Baryon
  Decays Using Run 3 Data
DTSTART;VALUE=DATE-TIME:20261020T231000Z
DTEND;VALUE=DATE-TIME:20261020T232000Z
DTSTAMP;VALUE=DATE-TIME:20261103T190232Z
UID:indico-contribution-36@cern.ch
DESCRIPTION:Speakers: Mr. TORRES CASTAÑO\, Camilo (PhD Student\, BUAP)\nW
 e describe an ongoing analysis performed with the CMS experiment\, studyin
 g decays of the heavy flavor baryon $\\Xi^{-}_b$. The main result is the m
 easurement of the branching fraction of $\\Xi^{-}_b \\to \\Xi^{-} \\psi(2S
 )$ relative to the normalization channel $\\Xi^{-}_b \\to \\Xi^{-} J/\\psi
 $\, achieved with improved precision compared to previous measurements. Th
 e previous measurement of this ratio was found to deviate from the trend o
 bserved in analogous $b$-meson decays\, and with the full statistics avail
 able from Run 3\, this analysis aims to test whether this deviation persis
 ts. The analysis is based on a sample of $pp$ collisions at $\\sqrt{s} = 1
 3.6~$TeV\, collected during the 2022\, 2023\, 2024\, and 2025 running peri
 ods of Run 3 of the LHC\, corresponding to an integrated luminosity of 279
 ~fb$^{-1}$. These are preliminary results and are subject to change.\n\nht
 tps://indico.nucleares.unam.mx/event/2675/session/3/contribution/36
LOCATION:Puebla
URL:https://indico.nucleares.unam.mx/event/2675/session/3/contribution/36
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