Study of charmonia in four-meson final states produced in two-photon collisions

Abstract

We report measurements of charmonia produced in two-photon collisions and decaying to four-meson final states, where the meson is either a charged pion or a charged kaon. The analysis is based on a 395fb^{-1} data sample accumulated with the Belle detector at the KEKB electron-positron collider. We observe signals for the three C-even charmonia eta_c(1S), chi_{c0}(1P) and chi_{c2}(1P) in the pi^+pi^-pi^+pi^-, K^+K^-pi^+pi^- and K^+K^-K^+K^- decay modes. No clear signals for eta_c(2S) production are found in these decay modes. We have also studied resonant structures in charmonium decays to two-body intermediate meson resonances. We report the products of the two-photon decay width and the branching fractions, Gamma_{gamma gamma}B, for each of the charmonium decay modes.

arXiv comment22 pages, 12 figures

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• Heavy quarkonium: progress, puzzles, and opportunities
• The Physics of the B Factories
• Quarkonia and their transitions
• Observation of the chi_c2(2P) meson in the reaction gamma gamma -> D Dbar at BABAR
• Two-Photon Widths of the chi_cJ States of Charmonium
• Study of B^{+-} -> K^{+-}(K_S K pi)^0 Decay and Determination of eta_c and eta_c(2S) Parameters
• Observation of eta_c(1S) and eta_c(2S) decays to K+ K- pi+ pi- pi0 in two-photon interactions
• First study of η_c, η(1760) and X(1835) production via η'π^+π^- final states in two-photon collisions
• Observation of new resonant structures in $\gamma \gamma \to \omega \varphi$, $\varphi \varphi$ and $\omega \omega$
• Search for psi(2S) -> gamma eta_c(2S) via fully reconstructed eta_c(2S) decays
• New puzzle in charmonium decays
• Study of $B_{u,d,s}\to K_0^{\ast }(1430)P$ and $K_0^{\ast }(1430)V$ decays within QCD factorization
• Measurement of eta_c(1S), eta_c(2S) and non-resonant eta' pi+ pi- production via two-photon collisions
• Observation of the charmonium decay ${\eta }_c\to \gamma \gamma$ in $J/\psi \to \gamma {\eta }_c$
• First observation of $\gamma \gamma \to p\bar{p}{K}^{+}{K}^{-}$ and search for exotic baryons in $pK$ systems
• Light hadron, Charmonium(-like) and Bottomonium(-like) states
• Observation of ${\chi }_{cJ}\to 4K_S^0$
• Two-photon physics at future electron-positron colliders
• Charmonium and Light Meson Spectroscopy