1201.6268 (M. J. Charles et al.)

A search for time-integrated CP violation in D0 -> h- h+ decays    [PDF]

M. J. Charles, for the LHCb Collaboration

The preliminary results of a search for time-integrated CP violation in D0 ->
h- h+ (h=K, pi) decays performed with 0.6 fb-1 of data collected by LHCb in
2011 are presented. The flavour of the charm meson is determined by the charge
of the slow pion in the D*+ -> D0 pi+ and D*- -> D0bar pi- decay chains. The
difference in CP asymmetry between D0 -> K- K+ and D0 -> pi- pi+, Delta ACP =
ACP(K- K+) - ACP(pi- pi+), is measured to be Delta ACP = [ -0.82 +- 0.21
(stat.) +- 0.11 (syst.) ] %. This differs from the hypothesis of CP
conservation by 3.5 sigma.

View original: http://arxiv.org/abs/1201.6268