Experimental study of psi' decays to K+K- pi^0 and K+K- eta

Abstract

Using $(106\pm 4)\times 10^6$ $\psip$ events accumulated with the BESIII detector at the BEPCII $e^{+}{e}^{-}$ collider, we present measurements of the branching fractions for psi' decays to $K^{+}{K}^{-}{\pi }^0$ and $K^{+}{K}^{-}\eta$. In these final states, the decay ${\psi }^{\prime }\to K_2^{\ast }(1430{)}^{+}{K}^{-}+c.c.$ is observed for the first time, and its branching fraction is measured to be $(7.12\pm 0.62{(stat.)}_{-0.61}^{+1.13}(syst.))\times 10^{-5}$, which indicates a violation of the helicity selection rule in $\psip$ decays. The branching fractions of ${\psi }^{\prime }\to K^{\ast }(892{)}^{+}{K}^{-}+c.c.,\varphi \eta ,\varphi {\pi }^0$ are also measured. The measurements are used to test the QCD predictions on charmonium decays.

18 pages, 12 figures

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• Heavy quarkonium: progress, puzzles, and opportunities
• The evasion of helicity selection rule in ${\chi }_{c1}\to VV$ and ${\chi }_{c2}\to VP$ via intermediate charmed meson loops
• Open charm effects in the explanation of the long-standing "$\rho \pi$ puzzle"
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Cited by in corpus (4)

• Determination of spin and parity of the $Z_c(3900)$
• Partial wave analysis of $\psi (3686)\to K^{+}{K}^{-}\eta$
• Precision measurements of ${\sigma }_B(e^{+}{e}^{-}\to K_S^0{K}^{\pm }{\pi }^{\mp })$ at center-of-mass energies between 3.8 and 4.6 GeV
• Observation of the helicity-selection-rule suppressed decay of the ${\chi }_{c2}$ charmonium state