Evidence for violation and measurement of -violating parameters in B J/(1020) decays in pp collisions at 13 TeV
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Abstract: (arXiv)
A pioneering machine-learning-based flavor-tagging algorithm combining same-side and opposite-side tagging is used to obtain the equivalent of 27000 tagged B J/(1020) decays from pp collisions at 13 TeV, collected by the CMS experiment and corresponding to an integrated luminosity of 96.5 fb. A time- and flavor-dependent angular analysis of the KK final state is used to measure parameters of the - system. The weak phase is measured to be = 73 23 (stat) 7 (syst) mrad, which, combined with a = 8 TeV CMS result, gives = 74 23 mrad. This value differs from zero by 3.2 standard deviations, providing evidence for violation in B J/(1020) decays. All measured physics parameters are found to agree with standard model predictions where available.Note:
- Submitted to Physical Review Letters. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-23-004 (CMS Public Pages)
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