An improved measurement of the decay B 0 s → μ + μ − and searches for the decays B 0 → μ + μ − and B 0 s → 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 B 0 s → μ + μ − branching fraction and effective lifetime are measured to be B ( B 0 s → μ + μ − ) = ( 3.0 9 + 0.46 + 0.15 − 0.43 − 0.11 ) × 10 − 9 and τ ( B 0 s → μ + μ − ) = ( 2.07 ± 0.29 ± 0.03 )     ps , respectively, where the uncertainties include both statistical and systematic contributions. No significant signal for B 0 → μ + μ − and B 0 s → μ + μ − γ decays is found and the upper limits B ( B 0 → μ + μ − ) < 2.6 × 10 − 10 and B ( B 0 s → μ + μ − γ ) < 2.0 × 10 − 9 at 95% confidence level are determined, where the latter is limited to the range m μ μ > 4.9     GeV / c 2 . Additionally, the ratio between the B 0 → μ + μ − and B 0 s → 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 / Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C.A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., Alkhazov, G., Alvarez Cartelle, P., Amato, S., Amhis, Y., An, L., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 105:1(2022). [10.1103/PhysRevD.105.012010]

Measurement of the Bs0 →μ+μ- decay properties and search for the B0 →μ+μ- and Bs0 →μ+μ-γ decays

Casse, G.;Sarti, A.;
2022

Abstract

An improved measurement of the decay B 0 s → μ + μ − and searches for the decays B 0 → μ + μ − and B 0 s → 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 B 0 s → μ + μ − branching fraction and effective lifetime are measured to be B ( B 0 s → μ + μ − ) = ( 3.0 9 + 0.46 + 0.15 − 0.43 − 0.11 ) × 10 − 9 and τ ( B 0 s → μ + μ − ) = ( 2.07 ± 0.29 ± 0.03 )     ps , respectively, where the uncertainties include both statistical and systematic contributions. No significant signal for B 0 → μ + μ − and B 0 s → μ + μ − γ decays is found and the upper limits B ( B 0 → μ + μ − ) < 2.6 × 10 − 10 and B ( B 0 s → μ + μ − γ ) < 2.0 × 10 − 9 at 95% confidence level are determined, where the latter is limited to the range m μ μ > 4.9     GeV / c 2 . Additionally, the ratio between the B 0 → μ + μ − and B 0 s → 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
branching fractions, LHCb, CERN, particles, CP violation
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of the Bs0 →μ+μ- decay properties and search for the B0 →μ+μ- and Bs0 →μ+μ-γ decays / Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C.A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., Alkhazov, G., Alvarez Cartelle, P., Amato, S., Amhis, Y., An, L., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 105:1(2022). [10.1103/PhysRevD.105.012010]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1673116
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