The CKM angle gamma is measured for the first time from mixing-induced CP violation between Bs0 -> Ds -/+ K pi +/- pi -/+ and Bs0 -> Ds +/- K -/+ pi -/+ pi +/- decays reconstructed in proton-proton collision data corresponding to an integrated luminosity of 9 fb(-1) recorded with the LHCb detector. A time-dependent amplitude analysis is performed to extract the CP-violating weak phase gamma - 2 beta (s) and, subsequently, gamma by taking the Bs0-Bs0 mixing phase beta (s) as an external input. The measurement yields gamma = (44 +/- 12)degrees modulo 180 degrees, where statistical and systematic uncertainties are combined. An alternative model-independent measurement, integrating over the five-dimensional phase space of the decay, yields gamma=44-13+20degrees modulo 180 degrees. Moreover, the Bs0-Bs0 oscillation frequency is measured from the flavour-specific control channel Bs0 -> Ds-pi +pi +pi - to be m(s) = (17.757 +/- 0.007(stat) +/- 0.008(syst)) ps(-1), consistent with and more precise than the current world-average value.
Aaij, R., Beteta, C.a., Adeva, B., Adinolfi, M., Aidala, C.a., Ajaltouni, Z., et al. (2021). Measurement of the CKM angle gamma and Bs0-Bs0 mixing frequency with Bs0 -> Ds -/+ h +/-pi +/-pi-/+ decays. JOURNAL OF HIGH ENERGY PHYSICS(3) [10.1007/JHEP03(2021)137].
Measurement of the CKM angle gamma and Bs0-Bs0 mixing frequency with Bs0 -> Ds -/+ h +/-pi +/-pi-/+ decays
Adinolfi, M.;Albicocco, P.;Jr.;Archilli, F.;Carbone, A.;Carboni, G.;Cattaneo, M.;Chen, S.;D'Ambrosio, C.;De Capua, S.;Ferrari, F.;Fontana, M.;Gao, Y.;Li, Y.;Pastore, A.;Petrucci, S.;Santovetti, E.Membro del Collaboration Group
;Wang, J.;Wang, Z.;Zhang, L.;
2021-01-01
Abstract
The CKM angle gamma is measured for the first time from mixing-induced CP violation between Bs0 -> Ds -/+ K pi +/- pi -/+ and Bs0 -> Ds +/- K -/+ pi -/+ pi +/- decays reconstructed in proton-proton collision data corresponding to an integrated luminosity of 9 fb(-1) recorded with the LHCb detector. A time-dependent amplitude analysis is performed to extract the CP-violating weak phase gamma - 2 beta (s) and, subsequently, gamma by taking the Bs0-Bs0 mixing phase beta (s) as an external input. The measurement yields gamma = (44 +/- 12)degrees modulo 180 degrees, where statistical and systematic uncertainties are combined. An alternative model-independent measurement, integrating over the five-dimensional phase space of the decay, yields gamma=44-13+20degrees modulo 180 degrees. Moreover, the Bs0-Bs0 oscillation frequency is measured from the flavour-specific control channel Bs0 -> Ds-pi +pi +pi - to be m(s) = (17.757 +/- 0.007(stat) +/- 0.008(syst)) ps(-1), consistent with and more precise than the current world-average value.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
