Branching fraction and effective lifetime measurements of the rare decay B 0 s → μ + μ − and searches for the decays B 0 → μ + μ − and B 0 s → 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 ( B 0 s → μ + μ − ) = ( 3.0 9 + 0.46 + 0.15 − 0.43 − 0.11 ) × 10 − 9 and the effective lifetime τ ( B 0 s → 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 B 0 → μ + μ − and B 0 s → μ + μ − γ decays is found and upper limits B ( B 0 → μ + μ − ) < 2.6 × 10 − 10 and B ( B 0 s → μ + μ − γ ) < 2.0 × 10 − 9 at the 95% C.L. are determined, where the latter is limited to the range m μ μ > 4.9     GeV / c 2 . The results are in agreement with the standard model expectations.

Analysis of neutral formula presented-meson decays into two muons / Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C., 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 LETTERS. - ISSN 0031-9007. - 128:4(2022). [10.1103/PhysRevLett.128.041801]

Analysis of neutral formula presented-meson decays into two muons

Casse, G.;Sarti, A.;
2022

Abstract

Branching fraction and effective lifetime measurements of the rare decay B 0 s → μ + μ − and searches for the decays B 0 → μ + μ − and B 0 s → 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 ( B 0 s → μ + μ − ) = ( 3.0 9 + 0.46 + 0.15 − 0.43 − 0.11 ) × 10 − 9 and the effective lifetime τ ( B 0 s → 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 B 0 → μ + μ − and B 0 s → μ + μ − γ decays is found and upper limits B ( B 0 → μ + μ − ) < 2.6 × 10 − 10 and B ( B 0 s → μ + μ − γ ) < 2.0 × 10 − 9 at the 95% C.L. are determined, where the latter is limited to the range m μ μ > 4.9     GeV / c 2 . The results are in agreement with the standard model expectations.
2022
branching fractions, LHCb, CERN, particles, CP violation
01 Pubblicazione su rivista::01a Articolo in rivista
Analysis of neutral formula presented-meson decays into two muons / Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C., 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 LETTERS. - ISSN 0031-9007. - 128:4(2022). [10.1103/PhysRevLett.128.041801]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1673303
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