A time-dependent, flavour-tagged measurement of CP violation is performed with B0-> D+D- and Bs0->Ds+Ds- decays, using data collected by the LHCb detector in proton-proton collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 6 fb-1. In B0-> D+D- decays the CP-violation parameters are measured to be (Formula presented.) In Bs0->Ds+Ds- decays the CP-violating parameter formulation in terms of phi_s and |lambda| results in (Formula presented.) These results represent the most precise single measurement of the CP-violation parameters in their respective channels. For the first time in a single measurement, CP symmetry is observed to be violated in B0-> D+D- decays with a significance exceeding six standard deviations.
Measurement of CP violation in B0-> D+D- and Bs0->Ds+Ds- decays
Bassi 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.;
2025
Abstract
A time-dependent, flavour-tagged measurement of CP violation is performed with B0-> D+D- and Bs0->Ds+Ds- decays, using data collected by the LHCb detector in proton-proton collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 6 fb-1. In B0-> D+D- decays the CP-violation parameters are measured to be (Formula presented.) In Bs0->Ds+Ds- decays the CP-violating parameter formulation in terms of phi_s and |lambda| results in (Formula presented.) These results represent the most precise single measurement of the CP-violation parameters in their respective channels. For the first time in a single measurement, CP symmetry is observed to be violated in B0-> D+D- decays with a significance exceeding six standard deviations.| File | Dimensione | Formato | |
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JHEP01(2025)061.pdf
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