Test of lepton universality with B0 → K*0ℓ+ℓ− decays

A test of lepton universality, performed by measuring the ratio of the branching fractions of the B0 → K*0μ+μ− and B0 → K*0e+e− decays, RK*0, is presented. The K*0 meson is reconstructed in the final state K+π−, which is required to have an invariant mass within 100 MeV/c2 of the known K*(892)0 mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of about 3 fb−1, collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The ratio is measured in two regions of the dilepton invariant mass squared, q2, to be RK*0= 0.66−+0.070.11stat±0.03systfor0.045

Keywords:

• Invariant mass
• Physics
• Branching fraction
• Lepton
• Particle physics
• Large Hadron Collider
• Standard deviation
• Standard Model
• Luminosity
• Meson

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