Branching 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{−0.43}{+0.46}{−0.11}{+0.15}) × 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 m_μμ > 4.9 GeV/c^2. The results are in agreement with the standard model expectations.

Analysis of Neutral B-Meson Decays into Two Muons

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.;Tomassetti, L.;
2022

Abstract

Branching 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{−0.43}{+0.46}{−0.11}{+0.15}) × 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 m_μμ > 4.9 GeV/c^2. The results are in agreement with the standard model expectations.
2022
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C. A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2500472
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