6533b820fe1ef96bd127aa8d

RESEARCH PRODUCT

Search for direct CP violation in D-0 -> h(-)h(+) modes using semileptonic B decays

Lhcb CollaborationArantza Oyanguren CamposPablo Ruiz Valls

subject

Violació CP (Física nuclear)High Energy Physics::PhenomenologyHigh Energy Physics::ExperimentFísica nuclearNuclear Experiment

description

A search for direct CP violation in D-0 -> h(-)h(+) (where h = K or pi) is presented using data corresponding to an integrated luminosity of 1.0 fb(-1) collected in 2011 by LHCb in pp collisions at a centre-of-mass energy of 7 TeV. The analysis uses D-0 mesons produced in inclusive semileptonic b-hadron decays to the D-0 μX final state, where the charge of the accompanying muon is used to tag the flavour of the D-0 meson. The difference in the CP-violating asymmetries between the two decay channels is measured to be Delta A(CP) = A(CP)(K-K+) ¿ A(CP)(pi(-)pi(+)) = (0.49 +/- 0.30 (stat) +/- 0.14 (syst))%. This result does not confirm the evidence for direct CP violation in the charm sector reported in other analyses.

yearjournalcountryeditionlanguage
2013-01-01
10.1016/j.physletb.2013.04.061http://hdl.handle.net/10550/33910