Measurement of the $CP$-violating phase $\phi_\mathrm{s}$ in the B$^0_\mathrm{s}\to$ J$/\psi\, \phi$(1020) $\to \mu^+\mu^-$K$^+$K$^-$ channel in proton-proton collisions at $\sqrt{s} =$ 13 TeV

Bruno, Giacomo;Bury, Florian Joel J;Caputo, Claudio;David, Pieter;Zobec, Joze;et.al.
(2021) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 816 (2021)

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Authors
  • Bruno, GiacomoUCLouvain
    Author
  • Bury, Florian Joel JUCLouvain
    Author
  • Caputo, ClaudioUCLouvain
    Author
  • David, PieterUCLouvain
    Author
  • Delaere, Christopheorcid-logoUCLouvain
    Author
  • Delcourt, MartinUCLouvain
    Author
  • Donertas, Izzeddin SuatUCLouvain
    Author
  • Giammanco, Andreaorcid-logoUCLouvain
    Author
  • Lemaitre, VincentUCLouvain
    Author
  • Mondal, KuntalUCLouvain
    Author
  • Prisciandaro, JessicaUCLouvain
    Author
  • Taliercio, AngelaUCLouvain
    Author
  • Teklishyn, MaksymUCLouvain
    Author
  • Vischia, PietroUCLouvain
    Author
  • Wuyckens, SophieUCLouvain
    Author
  • Zobec, JozeUCLouvain
    Author
  • et. al.
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Abstract
The CP -violating weak phase ϕs and the decay width difference ΔΓs between the light and heavy Bs0 mass eigenstates are measured with the CMS detector at the LHC in a sample of 48500 reconstructed Bs0→J/ψϕ(1020)→μ+μ−K+K− events. The measurement is based on a data sample corresponding to an integrated luminosity of 96.4fb−1 , collected in proton-proton collisions at s=13TeV in 2017–2018. To extract the values of ϕs and ΔΓs , a time-dependent and flavor-tagged angular analysis of the μ+μ−K+K− final state is performed. The analysis employs a dedicated tagging trigger and a novel opposite-side muon flavor tagger based on machine learning techniques. The measurement yields ϕs=−11±50(stat)±10(syst)mrad and ΔΓs=0.114±0.014(stat)±0.007(syst)ps−1 , in agreement with the standard model predictions. When combined with the previous CMS measurement at s=8TeV , the following values are obtained: ϕs=−21±44(stat)±10(syst)mrad , ΔΓs=0.1032±0.0095(stat)±0.0048(syst)ps−1 , a significant improvement over the 8 TeV result.
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Bruno, G., Bury, F. J. J., Caputo, C., David, P., Delaere, C., Delcourt, M., Donertas, I. S., Giammanco, A., Lemaitre, V., Mondal, K., Prisciandaro, J., Taliercio, A., Teklishyn, M., Vischia, P., Wuyckens, S., Zobec, J., & et al. (2021). Measurement of the $CP$-violating phase $\phi_\mathrm{s}$ in the B$^0_\mathrm{s}\to$ J$/\psi\, \phi$(1020) $\to \mu^+\mu^-$K$^+$K$^-$ channel in proton-proton collisions at $\sqrt{s} =$ 13 TeV. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 816. https://doi.org/10.1016/j.physletb.2021.136188 (Original work published 2021)