The time-dependent CP asymmetry in B0->J/PsiRho(770)0 decays is measured using proton-proton collision data corresponding to an integrated luminosity of 6 fb-1, collected with the LHCb detector at a center-of-mass energy of 13 TeV during the years 2015-2018. The CP-violation parameters for this process are determined to be 2betaccbard_{eff}=0.710\pm0.084\pm0.051 rad and |lambda|=1.019\pm0.034\pm0.024, where the first uncertainty is statistical and the second systematic. This constitutes the first observation of time-dependent CP violation in B0->J/PsiRho(770)0 decays. Assuming approximate SU(3) flavor symmetry, these results are combined with the previous consistent LHCb measurement to set the most stringent constraint on the penguin contribution, Deltaphi_s, to the CP-violating phase phi_s in Bs0->J/PsiPhi(1020) decays, yielding Deltaphi_s=5.0\pm4.6 mrad.
Observation of CP Violation in B0 ->J/Psi rho(770)0 Decays
Celestino I.Membro del Collaboration Group
;Cordova G.Membro del Collaboration Group
;Kleijne N.Membro del Collaboration Group
;Morello M. J.Membro del Collaboration Group
;Passaro D.Membro del Collaboration Group
;Pica L.Membro del Collaboration Group
;Riccardi D.Membro del Collaboration Group
;Xu A.Membro del Collaboration Group
;
2026
Abstract
The time-dependent CP asymmetry in B0->J/PsiRho(770)0 decays is measured using proton-proton collision data corresponding to an integrated luminosity of 6 fb-1, collected with the LHCb detector at a center-of-mass energy of 13 TeV during the years 2015-2018. The CP-violation parameters for this process are determined to be 2betaccbard_{eff}=0.710\pm0.084\pm0.051 rad and |lambda|=1.019\pm0.034\pm0.024, where the first uncertainty is statistical and the second systematic. This constitutes the first observation of time-dependent CP violation in B0->J/PsiRho(770)0 decays. Assuming approximate SU(3) flavor symmetry, these results are combined with the previous consistent LHCb measurement to set the most stringent constraint on the penguin contribution, Deltaphi_s, to the CP-violating phase phi_s in Bs0->J/PsiPhi(1020) decays, yielding Deltaphi_s=5.0\pm4.6 mrad.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.



