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.

Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2022). Analysis of Neutral B-Meson Decays into Two Muons. PHYSICAL REVIEW LETTERS, 128(4), 1-13 [10.1103/PhysRevLett.128.041801].

Analysis of Neutral B-Meson Decays into Two Muons

Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Maccolini, S.;Manuzzi, D.;Patrignani, C.;Pisani, F.;Villa, A.;Zucchelli, S.;
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., et al. (2022). Analysis of Neutral B-Meson Decays into Two Muons. PHYSICAL REVIEW LETTERS, 128(4), 1-13 [10.1103/PhysRevLett.128.041801].
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C.A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/898504
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