Measurement of CP violation in B0->J/ψKS0 and B0’->ψ(2S)KS0 decays

A measurement is presented of decay-time-dependent CP violation in the decays B0->J/ψKS0 and B0->ψˆ(2S)KS0, where the J/ψ is reconstructed from two electrons and the ψ(2S) from two muons. The analysis uses a sample of pp collision data recorded with the LHCb experiment at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb-1. The CP -violation observables are measured to be C(B0->J/ψ ˆKS0)=0.12±0.07±0.02, S(B0->J/ψKS0)=0.83±0.08±0.01,C(B0->ψˆ(2S)KS0)=-’0.05±0.10±0.01,S(B0->ψˆ(2S)KS0)=0.84±0.10±0.01,where C describes CP violation in the direct decay, and S describes CP violation in the interference between the amplitudes for the direct decay and for the decay after B0-B0bar oscillation. The first uncertainties are statistical and the second are systematic. The two sets of results are compatible with the previous LHCb measurement using B0->J/ψ€‚KS0 decays, where the J/ψ meson was reconstructed from two muons. The averages of all three sets of LHCb results are C(B0->[ccbar] KS0)=-’0.017±0.029, S(B0->’[ccbar] KS0)=0.760±0.034,under the assumption that higher-order contributions to the decay amplitudes are negligible. The uncertainties include statistical and systematic contributions