Branching Fraction Measurements of the Rare B 0 s → ϕ μ + μ − and B 0 s → f ′ 2 ( 1525 ) μ + μ − Decays

K. De Bruyn, Mick Mulder, C. J. G. Onderwater, M. van Veghel, LHCb Collaboration

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The branching fraction of the rare B0s→ϕμ+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 q2, the square of the dimuon invariant mass. In the q2 region between 1.1 and 6.0  GeV2/c4, 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 B0s→f′2(1525)μ+μ− decay is reported with a statistical significance of 9 standard deviations and its branching fraction is determined.
Original languageEnglish
Article number151801
Number of pages11
JournalPhysical Review Letters
Issue number15
Publication statusPublished - 5-Oct-2021

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