Measurement of angular parameters from the decay ${\mathrm{B}}^0\to {\mathrm{K}}^{\ast 0}{\mu }^{+}{\mu }^{-}$ in proton-proton collisions at $\sqrt{s}=$ 8 TeV

Abstract

Angular distributions of the decay ${\mathrm{B}}^0\to {\mathrm{K}}^{\ast 0}{\mu }^{+}{\mu }^{-}$ are studied using a sample of proton-proton collisions at $\sqrt{s}=$ 8 TeV collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 20.5 fb${}^{-1}$. An angular analysis is performed to determine the $P_1$ and $P_5^{\prime }$ parameters, where the $P_5^{\prime }$ 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 $P_1$ and $P_5^{\prime }$ parameters are determined as a function of the dimuon invariant mass squared. The measurements are in agreement with predictions based on the standard model.

Replaced with the published version. Added the journal reference. All the figures and tables, including additional supplementary figures, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-15-008/ (CMS Public Pages)

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