Observation of $B^0_s\rightarrow\chi_{c1}\phi$ decay and study of $B^0\rightarrow\chi_{c1,2}K^{*0}$ decays

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Affolder,S Bachmann,A D Webber,K Muller,M De Cian,G Polok,A Romero Vidal,D Brett,E Lanciotti,E Greening, B Jost,Romanovsky,M Deckenhoff,T Head,D Hynds

Nuclear Physics（2013）

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摘要

The first observation of the decay $B^0_s\\rightarrow\\chi_{c1}\\phi$ and a study of $B^0\\rightarrow\\chi_{c1,2}K^{*0}$ 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\\rightarrow\\chi_{c1}\\phi)}{\\cal{B}(B^0_s\\rightarrow J/\\psi\\phi)} \u0026=\u0026 (18.9 \\pm1.8\\,(stat)\\pm1.3\\,(syst)\\pm0.8\\,(\\cal{B})) \\times 10^{-2}, \\nonumber \\\\ \\noalign{\\vskip 3pt} \\dfrac{\\cal{B}(B^0\\rightarrow\\chi_{c1}K^{*0})}{\\cal{B}(B^0\\rightarrow J/\\psiK^{*0})} \u0026=\u0026 (19.8 \\pm1.1\\,(stat)\\pm1.2\\,(syst)\\pm0.9\\,(\\cal{B})) \\times 10^{-2}, \\nonumber \\\\ \\noalign{\\vskip 3pt} \\dfrac{\\cal{B}(B^0\\rightarrow\\chi_{c2}K^{*0})}{\\cal{B}(B^0\\rightarrow\\chi_{c 1}K^{*0})} \u0026=\u0026 (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 ${\\chi_{c}\\rightarrow J/\\psi \\gamma}$ modes.

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