Measurements of charm mixing parameters from the decay-time-dependent ratio of D-0 -> K+ pi(-) to D-0 -> K-pi(+) rates and the charge-conjugate ratio are reported. The analysis uses data, corresponding to 3 fb(-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) x 10(-5), y' = (4.8 +/- 1.0) x 10(-3), and R-D = (3.568 +/- 0.066) x 10(-3). Allowing for CP violation, the measurement is performed separately for D-0 and (D) over bar (0) mesons yielding A(D) = (-0.7 +/- 1.9)%, for the direct CP-violating asymmetry, and 0.75 < vertical bar q/p vertical bar<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.

Measurement of D-0-(D)over-bar(0) Mixing Parameters and Search for CP Violation Using D-0 -> K+ pi(-) Decays / R., A., B., A., M., A., C., A., A., A., Z., A., J., A., F., A., M., A., S., A., G., A., P. A., C., S., A., S., A., Y., A., L., A., J., A., R., A., J. E., A., R. B., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 111:25(2013). [10.1103/physrevlett.111.251801]

Measurement of D-0-(D)over-bar(0) Mixing Parameters and Search for CP Violation Using D-0 -> K+ pi(-) Decays

SARTI, ALESSIO;SCIUBBA, Adalberto;
2013

Abstract

Measurements of charm mixing parameters from the decay-time-dependent ratio of D-0 -> K+ pi(-) to D-0 -> K-pi(+) rates and the charge-conjugate ratio are reported. The analysis uses data, corresponding to 3 fb(-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) x 10(-5), y' = (4.8 +/- 1.0) x 10(-3), and R-D = (3.568 +/- 0.066) x 10(-3). Allowing for CP violation, the measurement is performed separately for D-0 and (D) over bar (0) mesons yielding A(D) = (-0.7 +/- 1.9)%, for the direct CP-violating asymmetry, and 0.75 < vertical bar q/p vertical bar<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.
2013
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of D-0-(D)over-bar(0) Mixing Parameters and Search for CP Violation Using D-0 -> K+ pi(-) Decays / R., A., B., A., M., A., C., A., A., A., Z., A., J., A., F., A., M., A., S., A., G., A., P. A., C., S., A., S., A., Y., A., L., A., J., A., R., A., J. E., A., R. B., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 111:25(2013). [10.1103/physrevlett.111.251801]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/560390
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