Observation of $B_s^0\to {\chi }_{c1}\varphi$ decay and study of $B^0\to {\chi }_{c1,2}{K}^{\ast 0}$ decays

Abstract

The first observation of the decay $B_s^0\to {\chi }_{c1}\varphi$ and a study of $B^0\to {\chi }_{c1,2}{K}^{\ast 0}$ decays are presented. The analysis is performed using a dataset, corresponding to an integrated luminosity of 1.0 fb${}^{-1}$, collected by the LHCb experiment in pp collisions at a centre-of-mass energy of 7 TeV. The following ratios of branching fractions are measured: \begin{equation*} \begin{array}{lll} \dfrac{\cal{B}(B^0_s\rightarrowχ_{c1}ϕ)}{\cal{B}(B^0_s\rightarrow J/ψϕ)} &=& (18.9 \pm1.8\,(stat)\pm1.3\,(syst)\pm0.8\,(\cal{B})) \times 10^{-2}, \nonumber \\ \noalign{\vskip 3pt} \dfrac{\cal{B}(B^0\rightarrowχ_{c1}K^{*0})}{\cal{B}(B^0\rightarrow J/\psiK^{*0})} &=& (19.8 \pm1.1\,(stat)\pm1.2\,(syst)\pm0.9\,(\cal{B})) \times 10^{-2}, \nonumber \\ \noalign{\vskip 3pt} \dfrac{\cal{B}(B^0\rightarrowχ_{c2}K^{*0})}{\cal{B}(B^0\rightarrowχ_{c 1}K^{*0})} &=& (17.1 \pm5.0\,(stat)\pm1.7\,(syst)\pm1.1\,(\cal{B})) \times 10^{-2}, \nonumber \\ \noalign{\vskip 3pt} \end{array} \end{equation*} \noindent where the third uncertainty is due to the limited knowledge of the branching fractions of ${\chi }_c\to J/\psi \gamma$ modes.

18 pages, 5 plots

References in corpus (3)

• PYTHIA 6.4 Physics and Manual
• B -> chi_cJ K decays revisited
• Measurement of the $B_s^0\to J/\psi K^{\ast 0}$ branching fraction and angular amplitudes

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• Probing the $P$-wave charmonium decays of $B_c$ meson
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• Study of charmonium and charmonium-like contributions in $B^{+}\to J/\psi \eta K^{+}$ decays
• Observation of the decay $\overline{B_s^0}\to {\chi }_{c2}{K}^{+}{K}^{-}$ in the $\phi$ mass region