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.
2025
Settore FIS/01 - Fisica Sperimentale
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
CP Violation; Hadron-Hadron Scattering
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/153924
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