Search for CP violation in B^0 -> J/psi K^0_S decays with first LHCb   data
  We report a measurement of the CP violation in B^0 -> J/\psi K^0_S decays. We perform a time-dependent analysis of the decays reconstructed in 35/pb of LHCb data that was taken in 2010. We measure the CP asymmetry parameter 
Murilo Rangel, for LHCb collaboration
hep-ex