Evidence for the decay $\psi (3770)\to K^{+}{K}^{-}$

Abstract

Existing data on the $e^{+}{e}^{-}\to K^{+}{K}^{-}$ cross section at the center-of-mass energy above 2.6 GeV are fitted with a sum of $\psi (3770)$ resonant and continuum contributions. Two solutions for the resonance production cross section are found with a significance of 3.2$\sigma$. Data on the $e^{+}{e}^{-}\to K_S{K}_L$ cross section are used to resolve the ambiguity and for further constraining the values of the $e^{+}{e}^{-}\to \psi (3770)\to K^{+}{K}^{-}$ cross section and the interference phase. They are found to be ${\sigma }_{\psi (3770)}=0.073_{-0.044}^{+0.061}$ pb and $\varphi =(309_{-35}^{+17}{)}^{\circ }$, respectively. The same fitting procedure for the $\psi (4160)$ resonance leads to the upper limit on the $e^{+}{e}^{-}\to \psi (4160)\to K^{+}{K}^{-}$ cross section ${\sigma }_{\psi (4160)}<0.062$ pb at 90\% confidence level.

5 pages, 4 figures

References in corpus (5)

• Precision Measurement of the e+e- --> K+K-(gamma) Cross Section with the Initial-State Radiation Method at BaBar
• Measurements of the cross sections for $e^{+}{e}^{-}\to \mathrm{hadrons}$ at 3.650, 3.6648, 3.773 GeV and the branching fraction for $\psi (3770)\to \mathrm{non}-D\bar{D}$
• Cross sections for the reactions $e^{+}{e}^{-}\to K_S^0{K}_L^0$, $K_S^0{K}_L^0{\pi }^{+}{\pi }^{-}$, $K_S^0{K}_S^0{\pi }^{+}{\pi }^{-}$, and $K_S^0{K}_S^0{K}^{+}{K}^{-}$ from events with initial-state radiation
• Study of $e^{+}{e}^{-}\to p\bar{p}$ in the vicinity of $\psi (3770)$
• First Measurement of the Electromagnetic Form Factor of the Neutral Kaon at a Large Momentum Transfer and the Effect of $SU(3)$ Breaking

Cited by in corpus (2)

• Contributions for the kaon pair from $\rho (770)$, $\omega (782)$ and their excited states in the $B\to K\bar{K}h$ decays
• Study of $\psi (3770)$ decaying to Baryon anti-Baryon Pairs