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Ackernley, T.; Alessio, F.; Amato, S.; Bachmann, S.; Belavin, V.; Belov, I.; Bernet, R.; Betancourt, C.; Bizzeti, A.; Boldyrev, A.; Boyer, A.; Buonaura, A.; Bursche, A.; Cai, H.; Calero Diaz, L.; Cardini, A.; Cattaneo, M.; Cavallero, G.; Celani, S.; Clemencic, M.; Coelho, J. A. B.; Cogan, J.; De Vellis, F.; Dembinski, H. -P.; Denysenko, V.; Deschamps, O.; Di Cicco, A.; Donohoe, A. M.; Durante, P.; Durham, J. M.; Ferreira Lopes, L.; Filippov, S.; Firlej, M.; Fitzgerald, D. S.; Fontana, M.; Gambetta, S.; Gerick, D.; Giubega, L.; Granado Cardoso, L. A.; Graugés, E.; Graverini, E.; Gruberg Cazon, B. R.; Hancock, T. H.; Hicheur, A.; John, M.; Keizer, F.; Kirsebom, V. S.; Koppenburg, P.; Kravchenko, P.; Kretzschmar, S.; Krzemien, W.; Lane, R.; Leroy, O.; Lomba Castro, J.; Lusiani, A.; Machefert, F.; Mariani, S.; Martinez Vidal, F.; Matev, R.; Mazurek, M.; Meloni, S.; Minard, M. -N.; Minotti, A.; Moise, R. D.; Monteil, S.; Müller, D.; Nanut, T.; Neri, I.; Oblakowska-Mucha, A.; Ossowska, A.; Pagare, B.; Pajero, T.; Parkinson, C. J.; Ponce, S.; Promberger, L.; Pullen, H.; Rademacker, J. H.; Ramos Pernas, M.; Rinnert, K.; Rodrigues, A. B.; Saborido Silva, J. J.; Sarpis, G.; Satta, A.; Senghi Soares, M.; Slater, M. W.; Smith, E.; Stevens, H.; Szabelski, A.; Szumlak, T.; Szymanski, M.; Tobin, M.; Tomassetti, L.; Valassi, A.; Valenti, G.; Valls Canudas, N.; van Beuzekom, M.; Weber, S. G.; Wu, H.; Zaffaroni, E.; Zhang, S.
Physical review. D, 01/2022, Letnik: 105, Številka: 1Journal Article
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 $\sqrt{s}$ = 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 $\mathscr{B}$($B^0_S$ → $μ^+μ^-$) = (3.09$^{(+0.46+0.15)}_{(-0.43-0.11)}$) x 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 $\mathscr{B}$($B^0$ → $μ^+μ^-$) < 2.6 x 10-10 and $B^0_S$ → $μ^+μ^-γ$ < 2.0 x 10-9 at 95% confidence level are determined, where the latter is limited to the range $m_{μμ}$ > 4.9 GeV/c2. Additionally, the ratio between the $B^0$ → $μ^+μ^-$ and $B^0_S$ → $μ^+μ^-$ branching fractions is measured to be $\mathscr{R}_{μ+μ-}$ < 0.095 at 95% confidence level. The results are in agreement with the Standard Model predictions.
