Measurement of angular parameters from the decay B⁰→ K*⁰ μ⁺μ⁻ in proton–proton collisions at √s = 8 TeV

Abstract

Angular distributions of the decay B⁰→ K*⁰ μ⁺μ⁻ are studied using a sample of proton–proton collisions at √s = 8 TeV collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 20.5fb⁻¹. An angular analysis is performed to determine the P1and P5′parameters, where the P5′parameter is of particular interest because of recent measurements that indicate a potential discrepancy with the standard model predictions. Based on a sample of 1397 signal events, the P1and P5′parameters are determined as a function of the dimuon invariant mass squared. The measurements are in agreement with predictions based on the standard model.