Branching Fraction Measurements of the Rare ${B}_{s}^{0}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ and ${B}_{s}^{0}\ensuremath{\rightarrow}{f}_{2}^{\ensuremath{'}}(1525){\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ Decays

Open Access

Branching Fraction Measurements of the Rare $B_{s}^{0} \to ϕ μ^{+} μ^{-}$ and $B_{s}^{0} \to f_{2}^{'} (1525) μ^{+} μ^{-}$ Decays

R. Aaij et al. (LHCb Collaboration)

Phys. Rev. Lett. 127, 151801 – Published 5 October 2021

Abstract

The branching fraction of the rare $B_{s}^{0} \to ϕ μ^{+} μ^{-}$ decay is measured using data collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to integrated luminosities of 1, 2, and $6 {fb}^{- 1}$ , respectively. The branching fraction is reported in intervals of $q^{2}$ , the square of the dimuon invariant mass. In the $q^{2}$ region between 1.1 and $6.0 {GeV}^{2} / c^{4}$ , the measurement is found to lie 3.6 standard deviations below a standard model prediction based on a combination of light cone sum rule and lattice QCD calculations. In addition, the first observation of the rare $B_{s}^{0} \to f_{2}^{'} (1525) μ^{+} μ^{-}$ decay is reported with a statistical significance of 9 standard deviations and its branching fraction is determined.

Received 28 May 2021
Accepted 19 August 2021

DOI:https://doi.org/10.1103/PhysRevLett.127.151801

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