# Observation of the decay $\overline{B_s^0} \rightarrow χ_{c2} K^+ K^-$ in the $\varphi$ mass region

collaboration, LHCb, Aaij, R, Adeva, B, Adinolfi, M, Aidala, CA, Ajaltouni, Z, Akar, S, Albicocco, P, Albrecht, J, Alessio, F
et al (show 823 more authors) (2018) Observation of the decay $\overline{B_s^0} \rightarrow χ_{c2} K^+ K^-$ in the $\varphi$ mass region. J. High Energ. Phys. (2018) 2018: 191.

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## Abstract

The $\overline{B_s^0} \rightarrow \chi_{c2} K^+ K^-$ decay mode is observed and its branching fraction relative to the corresponding $\chi_{c1}$ decay mode, in a $\pm 15 \textrm{MeV}/c^2$ window around the $\phi$ mass, is found to be $\frac{\mathcal{B}(\overline{B_s^0} \rightarrow \chi_{c2} K^+ K^-) }{ \mathcal{B}(\overline{B_s^0} \rightarrow \chi_{c1} K^+ K^-)} = (17.1 \pm 3.1 \pm 0.4 \pm 0.9)\%,$ where the first uncertainty is statistical, the second systematic and the third due to the knowledge of the branching fractions of radiative $\chi_c$ decays. The decay mode $\overline{B_s^0} \rightarrow \chi_{c1} K^+ K^-$ allows the $B_s^0$ mass to be measured as $m(B_s^0) = 5366.83 \pm 0.25 \pm 0.27 \, \textrm{MeV}/c^2,$ where the first uncertainty is statistical and the second systematic. A combination of this result with other LHCb determinations of the $B_s^0$ mass is made.

Item Type: Article All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2018-018.html hep-ex, hep-ex Symplectic Admin 08 May 2019 10:09 09 Nov 2021 08:17 10.1007/JHEP08(2018)191 https://doi.org/10.1038/s41467-019-09486-2 https://livrepository.liverpool.ac.uk/id/eprint/3040240