Time-integrated CP asymmetries in D0 decays to the final states K− K+ and π− π+ are measured using proton-proton collisions corresponding to 3fb^−1 of integrated luminosity collected at centre-of-mass energies of 7 TeV and 8 TeV. The D0 mesons are produced in semileptonic b-hadron decays, where the charge of the accompanying muon is used to determine the initial flavour of the charm meson. The difference in CP asymmetries between the two final states is measured to be ΔA_CP = A_CP(K− K+) − A_CP(π− π+) = (+0.14 ± 0.16(stat) ± 0.08(syst))%. A measurement of A_CP (K− K+) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D decays. It is found to be A_CP(K− K+) = (−0.06 ± 0.15(stat) ± 0.10(syst))%, where the correlation coefficient between ΔA_CP and A_CP(K− K+) is ρ = 0.28. By combining these results, the CP asymmetry in the D0 → π− π+ channel is A_CP(π− π+) = (−0.20 ± 0.19(stat) ± 0.10(syst))%.

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, et al. (2014). Measurement of CP Asymmetry in D0 → K− K+ and D0 → π− π+ Decays. JOURNAL OF HIGH ENERGY PHYSICS, 2014(7), 0-24 [10.1007/JHEP07(2014)041].

Measurement of CP Asymmetry in D0 → K− K+ and D0 → π− π+ Decays

CARBONE, ANGELO;GALLI, DOMENICO;MOGGI, NICCOLO';MUSSINI, MANUEL;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2014

Abstract

Time-integrated CP asymmetries in D0 decays to the final states K− K+ and π− π+ are measured using proton-proton collisions corresponding to 3fb^−1 of integrated luminosity collected at centre-of-mass energies of 7 TeV and 8 TeV. The D0 mesons are produced in semileptonic b-hadron decays, where the charge of the accompanying muon is used to determine the initial flavour of the charm meson. The difference in CP asymmetries between the two final states is measured to be ΔA_CP = A_CP(K− K+) − A_CP(π− π+) = (+0.14 ± 0.16(stat) ± 0.08(syst))%. A measurement of A_CP (K− K+) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D decays. It is found to be A_CP(K− K+) = (−0.06 ± 0.15(stat) ± 0.10(syst))%, where the correlation coefficient between ΔA_CP and A_CP(K− K+) is ρ = 0.28. By combining these results, the CP asymmetry in the D0 → π− π+ channel is A_CP(π− π+) = (−0.20 ± 0.19(stat) ± 0.10(syst))%.
2014
R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, et al. (2014). Measurement of CP Asymmetry in D0 → K− K+ and D0 → π− π+ Decays. JOURNAL OF HIGH ENERGY PHYSICS, 2014(7), 0-24 [10.1007/JHEP07(2014)041].
R. Aaij; B. Adeva; M. Adinolfi; A. Affolder; Z. Ajaltouni; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle; A. A. Alve...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/315121
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