A search for violation of the charge-parity (CP) symmetry in the D+->K-K+pi+ decay is presented, with proton-proton collision data corresponding to an integrated luminosity of 5.4 fb-1, collected at a center-of-mass energy of 13 TeV with the LHCb detector. A novel model-independent technique is used to compare the D+ and D- phase-space distributions, with instrumental asymmetries subtracted using the Ds+->K-K+pi+ decay as a control channel. The p value for the hypothesis of CP conservation is 8.1%. The CP asymmetry observables ACP|SPhipi+=(0.95 \pm 0.43 stat \pm 0.26syst)x10-3 and ACP|SKK-*0K+=(-0.26 \pm 0.56 stat \pm 0.18syst)x10-3 are also measured. These results show no evidence of CP violation and represent the most sensitive search performed through the phase space of a multibody decay.
Measurement of CP Violation Observables in D+ ->K-K+pi+ 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
;
2024
Abstract
A search for violation of the charge-parity (CP) symmetry in the D+->K-K+pi+ decay is presented, with proton-proton collision data corresponding to an integrated luminosity of 5.4 fb-1, collected at a center-of-mass energy of 13 TeV with the LHCb detector. A novel model-independent technique is used to compare the D+ and D- phase-space distributions, with instrumental asymmetries subtracted using the Ds+->K-K+pi+ decay as a control channel. The p value for the hypothesis of CP conservation is 8.1%. The CP asymmetry observables ACP|SPhipi+=(0.95 \pm 0.43 stat \pm 0.26syst)x10-3 and ACP|SKK-*0K+=(-0.26 \pm 0.56 stat \pm 0.18syst)x10-3 are also measured. These results show no evidence of CP violation and represent the most sensitive search performed through the phase space of a multibody decay.File | Dimensione | Formato | |
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PhysRevLett.133.251801.pdf
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