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Measurement of chi_(cJ) decaying into η^(prime)K^+K^-
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arxiv 1402.2023 v2 pith:7E27L2CM submitted 2014-02-10 hep-ex
Measurement of chi_(cJ) decaying into η^(prime)K^+K^-
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Using $(106.41\pm 0.86) \times 10^{6}$ $\psi(3686)$ events collected with the BESIII detector at BEPCII, we study for the first time the decay $\chi_{cJ}\to\eta'K^+K^-$, where $\eta'\to\gamma\rho^{0}$ and $\eta'\to\eta\pi^+\pi^-$. A partial wave analysis in the covariant tensor amplitude formalism is performed for the decay $\chi_{c1}\to\eta'K^+K^-$. Intermediate processes $\chi_{c1}\to\eta' f_0(980)$, $\chi_{c1}\to\eta' f_0(1710)$, $\chi_{c1}\to\eta' f_2'(1525)$ and $\chi_{c1}\to K^*_0(1430)^{\pm}K^{\mp}$ ($K^*_0(1430)^{\pm}\to\eta' K^{\pm}$) are observed with statistical significances larger than 5$\sigma$, and their branching fractions are measured.
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