A measurement of time-dependent CP violation in the decays of B0 and B0bar mesons to the final states J/ψ(->mu+mu-)KS0, Psi(2S)(->mu+mu-)KS0 and J/Psi(->e+e-)KS0 with KS0->pi+pi- is presented. The data correspond to an integrated luminosity of 6 fb-1 collected at a center-of-mass energy of s=13 TeV with the LHCb detector. The CP-violation parameters are measured to be SPsiKS0 = 0.717 \pm 0.013(stat)\pm 0.008(syst) and CPsiKS0= 0.008 \pm 0.012(stat) \pm 0.003(syst). This measurement of SPsiKS0 represents the most precise single measurement of the CKM angle \beta to date and is more precise than the current world average. In addition, measurements of the CP-violation parameters of the individual channels are reported and a combination with the LHCb Run 1 measurements is performed.
Measurement of CP Violation in B0 →Psi (->ell+ell-) KS0 (->pi+pi-) Decays
Bassi G.Membro del Collaboration Group
;Kleijne N.Membro del Collaboration Group
;Morello M. J.Membro del Collaboration Group
;Pica L.Membro del Collaboration Group
;Ribatti R.Membro del Collaboration Group
;
2024
Abstract
A measurement of time-dependent CP violation in the decays of B0 and B0bar mesons to the final states J/ψ(->mu+mu-)KS0, Psi(2S)(->mu+mu-)KS0 and J/Psi(->e+e-)KS0 with KS0->pi+pi- is presented. The data correspond to an integrated luminosity of 6 fb-1 collected at a center-of-mass energy of s=13 TeV with the LHCb detector. The CP-violation parameters are measured to be SPsiKS0 = 0.717 \pm 0.013(stat)\pm 0.008(syst) and CPsiKS0= 0.008 \pm 0.012(stat) \pm 0.003(syst). This measurement of SPsiKS0 represents the most precise single measurement of the CKM angle \beta to date and is more precise than the current world average. In addition, measurements of the CP-violation parameters of the individual channels are reported and a combination with the LHCb Run 1 measurements is performed.File | Dimensione | Formato | |
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PhysRevLett.132.021801_reduced.pdf
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