A measurement of the CP-violating parameters in B0s->DsK decays is reported, based on the analysis of proton-proton collision data collected by the LHCb experiment corresponding to an integrated luminosity of 6 fb-1 at a centre-of-mass energy of 13 TeV. The measured parameters are obtained with a decay-time dependent analysis yielding Cf = 0.791 \pm 0.061 \pm 0.022, AfDeltaG = −0.051 \pm 0.134 \pm 0.058, Afbar∆Γ = −0.303 \pm 0.125 \pm 0.055, Sf = −0.571 \pm 0.084 \pm 0.023 and Sfbar = −0.503 \pm 0.084 \pm 0.025, where the first uncertainty is statistical and the second systematic. This corresponds to CP violation in the interference between mixing and decay of about 8.6sigma. Together with the value of the B0s mixing phase -2betas, these parameters are used to obtain a measurement of the CKM angle γ equal to (74 \pm 12)deg modulo 180 deg, where the uncertainty contains both statistical and systematic contributions. This result is combined with the previous LHCb measurement in this channel using 3 fb-1 resulting in a determination of gamma=81-11+12deg.

Measurement of CP asymmetry in Bs0→Ds∓K± 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.
Membro del Collaboration Group
;
2025

Abstract

A measurement of the CP-violating parameters in B0s->DsK decays is reported, based on the analysis of proton-proton collision data collected by the LHCb experiment corresponding to an integrated luminosity of 6 fb-1 at a centre-of-mass energy of 13 TeV. The measured parameters are obtained with a decay-time dependent analysis yielding Cf = 0.791 \pm 0.061 \pm 0.022, AfDeltaG = −0.051 \pm 0.134 \pm 0.058, Afbar∆Γ = −0.303 \pm 0.125 \pm 0.055, Sf = −0.571 \pm 0.084 \pm 0.023 and Sfbar = −0.503 \pm 0.084 \pm 0.025, where the first uncertainty is statistical and the second systematic. This corresponds to CP violation in the interference between mixing and decay of about 8.6sigma. Together with the value of the B0s mixing phase -2betas, these parameters are used to obtain a measurement of the CKM angle γ equal to (74 \pm 12)deg modulo 180 deg, where the uncertainty contains both statistical and systematic contributions. This result is combined with the previous LHCb measurement in this channel using 3 fb-1 resulting in a determination of gamma=81-11+12deg.
2025
Settore FIS/01 - Fisica Sperimentale
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
B Physics; CKM Angle Gamma; 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/11384/153904
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