The branching fraction of the rare Bs0→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 Bs0→f2′(1525)μ+μ- decay is reported with a statistical significance of 9 standard deviations and its branching fraction is determined.
Branching Fraction Measurements of the Rare Bs0 →φμ+μ- And Bs0 → f2′ (1525)μ+μ- Decays
Calabrese R.;Capriotti L.;Couturier B.;Fiorini M.;Franzoso E.;Giugliano C.;Guarise M.;Kotriakhova S.;Luppi E.;Neri I.;Pappalardo L. L.;Passalacqua B.;Siddi B. G.;Tomassetti L.;
2021
Abstract
The branching fraction of the rare Bs0→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 Bs0→f2′(1525)μ+μ- decay is reported with a statistical significance of 9 standard deviations and its branching fraction is determined.File | Dimensione | Formato | |
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PhysRevLett.127.151801.pdf
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