The reconstruction efficiency of photons and neutral pions is measured using the relative yields of reconstructed $B^+ \to J/\psi K^{ *+} (\to K^+ \pi^{ 0})$ and $B^+ \to J/\psi K^{ +}$ decays. The efficiency is studied using the data set, corresponding to an integrated luminosity of $3~\mathrm{ fb}^{ -1}$, collected by the LHCb experiment in proton-proton collisions at the centre-of-mass energies of 7 and 8 TeV.
Categories: hep-ex