A study of indirect CP violation in D0 mesons through the determination of the parameter AGamma is presented using a data sample of pp collisions, corresponding to an integrated luminosity of 1.0fb(-1), collected with the LHCb detector and recorded at the center-of-mass energy of 7 TeV at the LHC. The parameter AGamma is the asymmetry of the effective lifetimes measured in decays of D0 and D0 mesons to the CP eigenstates K- K+ and pi- pi+. Fits to the data sample yield AGamma(KK)=(-0.350.620.12)*10(-3) and AGamma(pipi)=(0.331.060.14)*10(-3), where the first uncertainties are statistical and the second systematic. The results represent the world's best measurements of these quantities. They show no difference in AGamma between the two final states and no indication of CP violation.

Measurements of indirect CP asymmetries in D0 K- K+ and D0 pi- pi+ decays.

MORELLO, MICHAEL JOSEPH;
2014

Abstract

A study of indirect CP violation in D0 mesons through the determination of the parameter AGamma is presented using a data sample of pp collisions, corresponding to an integrated luminosity of 1.0fb(-1), collected with the LHCb detector and recorded at the center-of-mass energy of 7 TeV at the LHC. The parameter AGamma is the asymmetry of the effective lifetimes measured in decays of D0 and D0 mesons to the CP eigenstates K- K+ and pi- pi+. Fits to the data sample yield AGamma(KK)=(-0.350.620.12)*10(-3) and AGamma(pipi)=(0.331.060.14)*10(-3), where the first uncertainties are statistical and the second systematic. The results represent the world's best measurements of these quantities. They show no difference in AGamma between the two final states and no indication of CP violation.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11384/37041
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