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- W2884634884 abstract "Using decays to $$phi $$ -meson pairs, the inclusive production of charmonium states in $${b} $$ -hadron decays is studied with pp collision data corresponding to an integrated luminosity of $$3.0 {,mathrm{fb}}^{-1} $$ , collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. Denoting by $${mathcal {B}} _C equiv {mathcal {B}} ( {{b}} !rightarrow C X ) times {mathcal {B}} ( C!rightarrow phi phi )$$ the inclusive branching fraction of a $${{b}} $$ hadron to a charmonium state C that decays into a pair of $$phi $$ mesons, ratios $$R^{C_1}_{C_2}equiv {mathcal {B}} _{C_1} / {mathcal {B}} _{C_2}$$ are determined as $$R^{{upchi _{{{c}} 0}}}_{{eta _{{c}}} (1S)} = 0.147 pm 0.023 pm 0.011$$ , $$R^{{upchi _{{{c}} 1}}}_{{eta _{{c}}} (1S)} = 0.073 pm 0.016 pm 0.006$$ , $$R^{{upchi _{{{c}} 2}}}_{{eta _{{c}}} (1S)} = 0.081 pm 0.013 pm 0.005$$ , $$R^{{upchi _{{{c}} 1}}}_{{upchi _{{{c}} 0}}} = 0.50 pm 0.11 pm 0.01$$ , $$R^{{upchi _{{{c}} 2}}}_{{upchi _{{{c}} 0}}} = 0.56 pm 0.10 pm 0.01$$ and $$R^{{eta _{{c}}} (2S)}_{{eta _{{c}}} (1S)} = 0.040 pm 0.011 pm 0.004$$ . Here and below the first uncertainties are statistical and the second systematic. Upper limits at 90% confidence level for the inclusive production of X(3872), X(3915) and $${upchi _{{{c}} 2}} (2P)$$ states are obtained as $$R^{X(3872)}_{{upchi _{{{c}} 1}}} < 0.34$$ , $$R^{X(3915)}_{{upchi _{{{c}} 0}}} < 0.12$$ and $$R^{{upchi _{{{c}} 2}} (2P)}_{{upchi _{{{c}} 2}}} < 0.16$$ . Differential cross-sections as a function of transverse momentum are measured for the $${eta _{{c}}} (1S)$$ and $$chi _c$$ states. The branching fraction of the decay $${{{B}} ^0_{{s}}} !rightarrow phi phi phi $$ is measured for the first time, $${mathcal {B}} ( {{{B}} ^0_{{s}}} !rightarrow phi phi phi ) = (2.15 pm 0.54 pm 0.28 pm 0.21_{{mathcal {B}}}) times 10^{-6}$$ . Here the third uncertainty is due to the branching fraction of the decay $${{{B}} ^0_{{s}}} !rightarrow phi phi $$ , which is used for normalization. No evidence for intermediate resonances is seen. A preferentially transverse $$phi $$ polarization is observed. The measurements allow the determination of the ratio of the branching fractions for the $${eta _{{c}}} (1S)$$ decays to $$phi phi $$ and $${{p}} {overline{{{p}}}} $$ as $${mathcal {B}} ( {eta _{{c}}} (1S)!rightarrow phi phi )/{mathcal {B}} ( {eta _{{c}}} (1S)!rightarrow {{p}} {overline{{{p}}}} ) = 1.79 pm 0.14pm 0.32$$ ." @default.
- W2884634884 created "2018-08-03" @default.
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