Measurements of charm mixing parameters from the decay-time-dependent ratio of D0 K+ pi- to D0 K- pi+ rates and the charge-conjugate ratio are reported. The analysis uses data, corresponding to 3fb(-1) of integrated luminosity, from proton-proton collisions at 7 and 8 TeV center-of-mass energies recorded by the LHCb experiment. In the limit of charge-parity (CP ) symmetry, the mixing parameters are determined to be x'2=(5.5±4.9)*10(-5), y'=(4.8±1.0)*10(-3), and RD=(3.568±0.066)*10(-3). Allowing for CP violation, the measurement is performed separately for D0 and D0 mesons yielding AD=(-0.7±1.9)%, for the direct CP-violating asymmetry, and 0.75<|q/p|<1.24 at the 68.3% confidence level, for the parameter describing CP violation in mixing. This is the most precise determination of these parameters from a single experiment and shows no evidence for CP violation.
Archilli, F., Carboni, G., Santovetti, E., The LHCb, C. (2013). Measurement of D⁰-D‾⁰ mixing parameters and search for CP violation using D⁰ K+ → pi- decays. PHYSICAL REVIEW LETTERS, 111(25) [10.1103/PhysRevLett.111.251801].
Measurement of D⁰-D‾⁰ mixing parameters and search for CP violation using D⁰ K+ → pi- decays
Archilli, FMembro del Collaboration Group
;Carboni, GMembro del Collaboration Group
;Santovetti, EMembro del Collaboration Group
;
2013-01-01
Abstract
Measurements of charm mixing parameters from the decay-time-dependent ratio of D0 K+ pi- to D0 K- pi+ rates and the charge-conjugate ratio are reported. The analysis uses data, corresponding to 3fb(-1) of integrated luminosity, from proton-proton collisions at 7 and 8 TeV center-of-mass energies recorded by the LHCb experiment. In the limit of charge-parity (CP ) symmetry, the mixing parameters are determined to be x'2=(5.5±4.9)*10(-5), y'=(4.8±1.0)*10(-3), and RD=(3.568±0.066)*10(-3). Allowing for CP violation, the measurement is performed separately for D0 and D0 mesons yielding AD=(-0.7±1.9)%, for the direct CP-violating asymmetry, and 0.75<|q/p|<1.24 at the 68.3% confidence level, for the parameter describing CP violation in mixing. This is the most precise determination of these parameters from a single experiment and shows no evidence for CP violation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
