Branching fraction and effective lifetime measurements of the rare decay B0s → μþμ− and searches for the decays B0 → μþμ− and B0s → μþμ−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 BðB0 → μþμ−Þ 1⁄4 ð3.09þ0.46þ0.15Þ × 10−9 and the effective lifetime τðB0 → μþμ−Þ 1⁄4 s −0.43−0.11 s 2.07 0.29 0.03 ps are measured, where the first uncertainty is statistical and the second systematic. No significant signal for B0 → μþμ− and B0s → μþμ−γ decays is found and upper limits BðB0 → μþμ−Þ < 2.6 × 10−10 and BðB0s → μþμ−γÞ < 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.

Analysis of Neutral B-Meson Decays into Two Muons

Andreotti, M.;Atzeni, M.;Bartolini, M.;Bedeschi, F.;Borsato, M.;Burr, C.;Carbone, A.;Cattaneo, M.;D'Ambrosio, C.;Davis, A.;Dettori, F.;dos Reis, A. C.;Evans, T.;Ferrari, F.;Fontana, M.;Fontanelli, F.;Frank, M.;Galli, D.;Giovannetti, M.;Han, Q.;Lai, A.;Lanfranchi, G.;Li, H.;Li, Y.;Lu, Y.;Lusiani, Alberto;Ma, L.;Manca, G.;Morello, Michael Joseph;Murphy, C. H.;Pajero, T.;Pica, Lorenzo;Piccini, M.;Punzi, G.;Ribatti, R.;Sarti, A.;Schneider, O.;Taneja, S.;Villa, A.;Wang, C.;Wang, J.;Xu, J.;Xu, L.;Yuan, X.;Zhang, L.;Zhang, S.;Zhou, Y.;Zhu, X.;
2022

Abstract

Branching fraction and effective lifetime measurements of the rare decay B0s → μþμ− and searches for the decays B0 → μþμ− and B0s → μþμ−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 BðB0 → μþμ−Þ 1⁄4 ð3.09þ0.46þ0.15Þ × 10−9 and the effective lifetime τðB0 → μþμ−Þ 1⁄4 s −0.43−0.11 s 2.07 0.29 0.03 ps are measured, where the first uncertainty is statistical and the second systematic. No significant signal for B0 → μþμ− and B0s → μþμ−γ decays is found and upper limits BðB0 → μþμ−Þ < 2.6 × 10−10 and BðB0s → μþμ−γÞ < 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.
2022
Settore FIS/01 - Fisica Sperimentale
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/129105
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