Measurement of the CP asymmetry in B(0)→K(*0)μ(+)μ(-) decays

Phys Rev Lett. 2013 Jan 18;110(3):031801. doi: 10.1103/PhysRevLett.110.031801. Epub 2013 Jan 17.

Abstract

A measurement of the CP asymmetry in B(0)→K(*0)μ(+)μ(-) decays is presented, based on 1.0 fb(-1) of pp collision data recorded by the LHCb experiment during 2011. The measurement is performed in six bins of invariant mass squared of the μ(+)μ(-) pair, excluding the J/ψ and ψ(2S) resonance regions. Production and detection asymmetries are removed using the B(0)→J/ψK(*0) decay as a control mode. The integrated CP asymmetry is found to be -0.072±0.040(stat)±0.005(syst), consistent with the standard model.