2021/05/31 by LHCb collaboration, R. Aaij, C. Abellán Beteta +959 · 1 citation
Physics and Astronomy · #hep-ex
paper · pdf · doi:10.1103/physrevlett.127.151801
published as Phys. Rev. Lett. 127, 151801 (2021) · All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-014.html (LHCb public pages)
arxiv created 2021/10/06 · arxiv updated 2021/10/07
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 \rmTeV, corresponding to integrated luminosities of 1, 2 and 6 \rm 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 \rm Ge\kern -0.1em V2 /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→ f2^′(1525)μ+μ- decay is reported with a statistical significance of nine standard deviations and its branching fraction is determined.