An improved measurement of the decay B0s → μ+ μ− and searches for the decays B0 → μ+ μ− and B0s → μ+ μ− γ are performed at the LHCb experiment using data collected in proton-proton collisions at √s = 7, 8 and 13 TeV, corresponding to integrated luminosities of 1, 2 and 6 fb^−1, respectively. The B0s → μ+ μ− branching fraction and effective lifetime are measured to be B(B0s → μ+ μ−) = (3.09{−0.43}{+0.46}{−0.11}{+0.15}) × 10^−9 and τ(B0s → μ+ μ−) = (2.07 ± 0.29 ± 0.03) ps, respectively, where the uncertainties include both statistical and systematic contributions. No significant signal for B0 → μ+ μ− and B0s → μ+ μ− γ decays is found and the upper limits B(B0 → μ+ μ−) < 2.6 × 10^−10 and B(B0s → μ+ μ− γ) < 2.0 × 10^−9 at 95% confidence level are determined, where the latter is limited to the range m_μμ > 4.9 GeV/c^2. Additionally, the ratio between the B0 → μ+ μ− and B0s → μ+ μ− branching fractions is measured to be R_μ+μ− < 0.095 at 95% confidence level. The results are in agreement with the Standard Model predictions.

Measurement of the Bs0 →μ+μ- decay properties and search for the B0 →μ+μ- and Bs0 →μ+μ-γ 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.;Tomassetti, L.;
2022

Abstract

An improved measurement of the decay B0s → μ+ μ− and searches for the decays B0 → μ+ μ− and B0s → μ+ μ− γ are performed at the LHCb experiment using data collected in proton-proton collisions at √s = 7, 8 and 13 TeV, corresponding to integrated luminosities of 1, 2 and 6 fb^−1, respectively. The B0s → μ+ μ− branching fraction and effective lifetime are measured to be B(B0s → μ+ μ−) = (3.09{−0.43}{+0.46}{−0.11}{+0.15}) × 10^−9 and τ(B0s → μ+ μ−) = (2.07 ± 0.29 ± 0.03) ps, respectively, where the uncertainties include both statistical and systematic contributions. No significant signal for B0 → μ+ μ− and B0s → μ+ μ− γ decays is found and the upper limits B(B0 → μ+ μ−) < 2.6 × 10^−10 and B(B0s → μ+ μ− γ) < 2.0 × 10^−9 at 95% confidence level are determined, where the latter is limited to the range m_μμ > 4.9 GeV/c^2. Additionally, the ratio between the B0 → μ+ μ− and B0s → μ+ μ− branching fractions is measured to be R_μ+μ− < 0.095 at 95% confidence level. The results are in agreement with the Standard Model predictions.
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/11392/2500469
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