A search for the rare decays B0s→μ+μ− and B0→μ+μ− is performed at the LHCb experiment using data collected in pp collisions corresponding to a total integrated luminosity of 4.4  fb−1. An excess of B0s→μ+μ− decays is observed with a significance of 7.8 standard deviations, representing the first observation of this decay in a single experiment. The branching fraction is measured to be B(B0s→μ+μ−)=(3.0±0.6+0.3−0.2)×10−9, where the first uncertainty is statistical and the second systematic. The first measurement of the Bs→μ+μ− effective lifetime, τ(B0s→μ+μ−)=2.04±0.44±0.05  ps, is reported. No significant excess of B0→μ+μ− decays is found, and a 95% confidence level upper limit, B(B0→μ+μ−)<3.4×10−10, is determined. All results are in agreement with the standard model expectations.

Measurement of the Bs0 →μ+μ- branching fraction and effective lifetime and search for B0 →μ+μ- Decays / Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., Andrews, J.E., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 118:19(2017). [10.1103/PhysRevLett.118.191801]

Measurement of the Bs0 →μ+μ- branching fraction and effective lifetime and search for B0 →μ+μ- Decays

Capriotti, L.;Casse, G.;Sarti, A.;Sciubba, A.;
2017

Abstract

A search for the rare decays B0s→μ+μ− and B0→μ+μ− is performed at the LHCb experiment using data collected in pp collisions corresponding to a total integrated luminosity of 4.4  fb−1. An excess of B0s→μ+μ− decays is observed with a significance of 7.8 standard deviations, representing the first observation of this decay in a single experiment. The branching fraction is measured to be B(B0s→μ+μ−)=(3.0±0.6+0.3−0.2)×10−9, where the first uncertainty is statistical and the second systematic. The first measurement of the Bs→μ+μ− effective lifetime, τ(B0s→μ+μ−)=2.04±0.44±0.05  ps, is reported. No significant excess of B0→μ+μ− decays is found, and a 95% confidence level upper limit, B(B0→μ+μ−)<3.4×10−10, is determined. All results are in agreement with the standard model expectations.
2017
Branching fraction CP violation Flavor physics Rare decay Hadron-Hadron scattering (experiments)
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of the Bs0 →μ+μ- branching fraction and effective lifetime and search for B0 →μ+μ- Decays / Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., Andrews, J.E., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 118:19(2017). [10.1103/PhysRevLett.118.191801]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1074610
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