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

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

CMS

Collaboration

2020

19 pages

Report number:

CMS-PAS-BPH-20-001

Experiments:

CERN-LHC-CMS

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Abstract:

The

CP

violating weak phase

\phi_{\text{s}}

, and the decay width difference

\Delta\Gamma_{\text{s}}

between the light and heavy

\mathrm{B_s}

mass eigenstates are measured with the CMS detector at the LHC in a sample of reconstructed

\mathrm{B}_s \to \mathrm{J}/\psi\,\phi(1020) \to \mu^+\mu^-\,\mathrm{K}^+\mathrm{K}^-

decays. The measurement is based on a data set corresponding to an integrated luminosity of

96.4\;\mathrm{fb}^{-1}

, collected in proton-proton collisions at a center-of-mass energy of

13\;\mathrm{TeV}

in 2017-2018. To extract the values of

\phi_{\text{s}}

and

\Delta\Gamma_{\text{s}}

, a time-dependent and flavor-tagged angular analysis of the

\mu^+\mu^-\,\mathrm{K}^+\mathrm{K}^-

final state is performed. The analysis employs a novel opposite-side muon flavor tagger based on machine learning techniques, which, in conjunction with a dedicated tagging trigger, allowed to reach an unprecedented tagging power. The measurement yields

\phi_{\text{s}} = -0.011 \pm 0.050\,\mathrm{(stat)} \pm 0.010\,\mathrm{(syst)}\;\mathrm{rad}

, and

\Delta\Gamma_{\text{s}} = 0.114 \pm 0.014\,\mathrm{(stat)} \pm 0.007\,\mathrm{(syst)}\;\mathrm{ps}^{-1}

, in agreement with the standard model predictions. When combined with our previous measurement at a center-of-mass energy of 8 TeV, the following values are obtained:

\phi_{\text{s}} = -0.021 \pm 0.045\;\mathrm{rad}

,

\Delta\Gamma_{\text{s}} = 0.1074 \pm 0.0097\;\mathrm{ps}^{-1}

, a significant improvement over the 8 TeV result.

Note:

Preliminary results

Monte-Carlo
p p: scattering
p p: colliding beams
B/s0: hadronic decay
J/psi(3100): leptonic decay
Phi(1020): hadronic decay
K: pair production
width: difference
decay: width
time dependence

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