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.
Measurement of CP Violation in B0 →ψ (→ℓ+ℓ-) KS0 (→π+π-) Decays
2024
Settore FIS/01 - Fisica Sperimentale
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
Meson system; A-center; Center-of-mass energies; Centre-of-mass energies; CP violations; CP-violation parameters; Final state; Integrated luminosity; Measurements of; Time dependent
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/154004
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