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B.Zou, Q.Zucchelli, S.Zuliani, D.Zunica, G.2022-03-142022-03-142022-03-142022-01-2510.1103/PhysRevLett.128.041801https://infoscience.epfl.ch/handle/20.500.14299/186422WOS:000754148900001Branching fraction and effective lifetime measurements of the rare decay B0s→μ+μ− and searches for the decays B0→μ+μ− and B0s→μ+μ−γ are reported using proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a luminosity of 9  fb−1. The branching fraction B(B0s→μ+μ−)=(3.09+0.46+0.15−0.43−0.11)×10−9 and the effective lifetime τ(B0s→μ+μ−)=2.07±0.29±0.03  ps are measured, where the first uncertainty is statistical and the second systematic. No significant signal for B0→μ+μ− and B0s→μ+μ−γ decays is found and upper limits B(B0→μ+μ−)<2.6×10−10 and B(B0s→μ+μ−γ)<2.0×10−9 at the 95% C.L. are determined, where the latter is limited to the range mμμ>4.9  GeV/c2. The results are in agreement with the standard model expectations.Physics, MultidisciplinaryPhysicstooltext::journal::journal article::research article