Evidence for the decay $B^0\to J/\psi \omega$ and measurement of the relative branching fractions of $B_s^0$ meson decays to $J/\psi \eta$ and $J/\psi {\eta }^{{}^{\prime }}$

Abstract

First evidence of the $B^0\to J/\psi \omega$ decay is found and the $B_s^0\to J/\psi \eta$ and $B_s^0\to J/\psi {\eta }^{\prime }$ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 ${\mathrm{fb}}^{-1}$ collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=7$ TeV. The branching fractions of these decays are measured relative to that of the ${\mathrm{B}}^0\to J/\psi {\rho }^0$ decay: $$\frac{Br(B^0\to J/\psi \omega )}{Br(B^0\to J/\psi {\rho }^0)}=0.89\pm 0.19(stat{)}_{-0.13}^{+0.07}(syst)$$ $$\frac{Br(B_s^0\to J/\psi \eta )}{Br(B^0\to J/\psi {\rho }^0)}=14.0\pm 1.2(stat{)}_{-1.5}^{+1.1}(syst{)}_{-1.0}^{+1.1}(\frac{f_d}{f_s}),$$ $$\frac{Br(B_s^0\to J/\psi {\eta }^{\prime })}{Br(B^0\to J/\psi {\rho }^0)}=12.7\pm 1.1(stat{)}_{-1.3}^{+0.5}(syst{)}_{-0.9}^{+1.0}(\frac{f_d}{f_s}),$$ where the last uncertainty is due to the knowledge of $f_d/f_s$, the ratio of b-quark hadronization factors that accounts for the different production rate of $B^0$ and $B_s^0$ mesons. The ratio of the branching fractions of $B_s^0\to J/\psi {\eta }^{\prime }$ and $B_s^0\to J/\psi \eta$ decays is measured to be $$\frac{Br(B_s^0\to J/\psi {\eta }^{\prime })}{Br(B_s^0\to J/\psi \eta )}=0.90\pm 0.09(stat{)}_{-0.02}^{+0.06}(syst).$$

23 pages, 7 figures

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• Analysis of the resonant components in B0->J/ψpi+pi-
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