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Measurement of CP asymmetry in D-0 -> K- K+ and D-0 -> pi(-) pi(+) decays

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Measurement of CP asymmetry in D-0 -> K- K+ and D-0 -> pi(-) pi(+) decays

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dc.contributor.author	LHCb Collaboration
dc.contributor.author	Martínez Vidal, Fernando
dc.contributor.author	Oyanguren Campos, Arantza
dc.contributor.author	Ruiz Valls, Pablo
dc.contributor.author	Sánchez Mayordomo, Carlos
dc.date.accessioned	2016-04-20T10:15:26Z
dc.date.available	2016-04-20T10:15:26Z
dc.date.issued	2014
dc.identifier.citation	LHCb Collaboration Martínez Vidal, Fernando Oyanguren Campos, Arantza Ruiz Valls, Pablo Sánchez Mayordomo, Carlos 2014 Measurement of CP asymmetry in D-0 -> K- K+ and D-0 -> pi(-) pi(+) decays Journal Of High Energy Physics 07 7 041-1 041-25
dc.identifier.uri	http://hdl.handle.net/10550/52882
dc.description.abstract	Time-integrated CP asymmetries in D-0 decays to the final states K- K+ and pi(-) pi(+) are measured using proton-proton collisions corresponding to 3 fb(-1) of integrated luminosity collected at centre-of-mass energies of 7 TeV and 8 TeV. The D-0 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 Delta A(CP) = A(CP)(K- K+) ¿ A(CP)(pi(-) pi(+)) = (+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 Delta A(CP) and A(CP)(K- K+) is rho = 0.28. By combining these results, the CP asymmetry in the D-0 -> pi(-) pi(+) channel is A(CP)(pi(-) pi(+)) = (-0.20 +/- 0.19 (stat) +/- 0.10 (syst))%.
dc.language.iso	eng
dc.relation.ispartof	Journal Of High Energy Physics, 2014, vol. 07, num. 7, p. 041-1-041-25
dc.subject	Física nuclear
dc.title	Measurement of CP asymmetry in D-0 -> K- K+ and D-0 -> pi(-) pi(+) decays
dc.type	journal article	es_ES
dc.date.updated	2016-04-20T10:15:26Z
dc.identifier.doi	10.1007/JHEP07(2014)041
dc.identifier.idgrec	099509
dc.rights.accessRights	open access	es_ES