A time-dependent, favour-tagged measurement of CP violation is performed with B0 → D+D− and B0 s → D+ s D− s 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 SD+D− = −0.552 ± 0.100 (stat) ± 0.010 (syst), CD+D− = 0.128 ± 0.103 (stat) ± 0.010 (syst). In B0 s → D+ s D− s decays the CP-violating parameter formulation in terms of ϕs and |λ| results in ϕs = −0.086 ± 0.106 (stat) ± 0.028 (syst) rad, |λD + s D − s | = 1.145 ± 0.126 (stat) ± 0.031 (syst). These results represent the most precise single measurement of the CP-violation parameters in their respective channels. For the frst time in a single measurement, CP symmetry is observed to be violated in B0 → D+D− decays with a signifcance exceeding six standard deviations.

Measurement of CP violation in B0 → D+D− and B0s →Ds+Ds- decays

Contu, A.;De Angelis, C.;Dettori, F.;Dordei, F.;Fabiano, F.;Litvinov, R.;Manca, G.;Oldeman, R.;Provenzano, D.;Saitta, B.;Sun, J.;
2025-01-01

Abstract

A time-dependent, favour-tagged measurement of CP violation is performed with B0 → D+D− and B0 s → D+ s D− s 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 SD+D− = −0.552 ± 0.100 (stat) ± 0.010 (syst), CD+D− = 0.128 ± 0.103 (stat) ± 0.010 (syst). In B0 s → D+ s D− s decays the CP-violating parameter formulation in terms of ϕs and |λ| results in ϕs = −0.086 ± 0.106 (stat) ± 0.028 (syst) rad, |λD + s D − s | = 1.145 ± 0.126 (stat) ± 0.031 (syst). These results represent the most precise single measurement of the CP-violation parameters in their respective channels. For the frst time in a single measurement, CP symmetry is observed to be violated in B0 → D+D− decays with a signifcance exceeding six standard deviations.
2025
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/11584/434247
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