We present a measurement of the time-dependent CP-violating asymmetry in Bs0 -> J/Psi Phi decays, using data collected with the LHCb detector at the LHC. The decay time distribution of Bs0 -> J/Psi Phi is characterized by the decay widths Gamma_H and Gamma_L of the heavy and light mass eigenstates, respectively, of the Bs0-antiBs0 system and by a CP-violating phase Phi_s. In a sample of about 8500 Bs0 -> J/Psi Phi events isolated from 0.37  fb-1 of pp collisions at sqrt(s)=7  TeV, we measure Phi_s=0.15+-0.18(stat)+-0.06(syst)  rad. We also find an average Bs0 decay width Gamma_s≡(Gamma_L+Gamma_H)/2=0.657+-0.009(stat)+-0.008(syst)  ps^-1 and a decay width difference DeltaGamma_s == Gamma_L-Gamma_H=0.123+-0.029(stat)+-0.011(syst)  ps^-1. Our measurement is insensitive to the transformation (Phi_s,DeltaGamma_s) <-> (pi-Phi_s,-DeltaGamma_s).

Measurement of the CP-violating phase s in the decay Bs0→J/ψ / R., A., C., A.B., B., A., M., A., C., A., A., A., Z., A., J., A., F., A., M., A., G., A., P., A.C., A., A., S., A., Y., A., J., A., R., A., O., A.G., F., A., L., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 108:10(2012), pp. 101803-1-101803-8. [10.1103/PhysRevLett.108.101803]

Measurement of the CP-violating phase s in the decay Bs0→J/ψ

BIZZETI, Andrea;
2012

Abstract

We present a measurement of the time-dependent CP-violating asymmetry in Bs0 -> J/Psi Phi decays, using data collected with the LHCb detector at the LHC. The decay time distribution of Bs0 -> J/Psi Phi is characterized by the decay widths Gamma_H and Gamma_L of the heavy and light mass eigenstates, respectively, of the Bs0-antiBs0 system and by a CP-violating phase Phi_s. In a sample of about 8500 Bs0 -> J/Psi Phi events isolated from 0.37  fb-1 of pp collisions at sqrt(s)=7  TeV, we measure Phi_s=0.15+-0.18(stat)+-0.06(syst)  rad. We also find an average Bs0 decay width Gamma_s≡(Gamma_L+Gamma_H)/2=0.657+-0.009(stat)+-0.008(syst)  ps^-1 and a decay width difference DeltaGamma_s == Gamma_L-Gamma_H=0.123+-0.029(stat)+-0.011(syst)  ps^-1. Our measurement is insensitive to the transformation (Phi_s,DeltaGamma_s) <-> (pi-Phi_s,-DeltaGamma_s).
2012
108
10
101803-1
101803-8
Measurement of the CP-violating phase s in the decay Bs0→J/ψ / R., A., C., A.B., B., A., M., A., C., A., A., A., Z., A., J., A., F., A., M., A., G., A., P., A.C., A., A., S., A., Y., A., J., A., R., A., O., A.G., F., A., L., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 108:10(2012), pp. 101803-1-101803-8. [10.1103/PhysRevLett.108.101803]
R., Aaij; C., Abellan Beteta; B., Adeva; M., Adinolfi; C., Adrover; A., Affolder; Z., Ajaltouni; J., Albrecht; F., Alessio; M., Alexander; G., Alkhazo...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/709791
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