Measurement of $CP$ violation parameters and polarisation fractions in $B_s^0\to J/\psi {\overline{K}}^{\ast 0}$ decays

Abstract

The first measurement of $CP$ asymmetries in the decay $B_s^0\to J/\psi {\overline{K}}^{\ast }(892{)}^0$ and an updated measurement of its branching fraction and polarisation fractions are presented. The results are obtained using data corresponding to an integrated luminosity of $3.0f{b}^{-1}$ of proton-proton collisions recorded with the LHCb detector at centre-of-mass energies of $7$ and $8\mathrm{TeV}$. Together with constraints from $B^0\to J/\psi {\rho }^0$, the results are used to constrain additional contributions due to penguin diagrams in the $CP$-violating phase ${\varphi }_s$, measured through $B_s^0$ decays to charmonium.

arXiv comment39 pages, 7 tables, 8 figures. All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2015-034.html

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