Gluonia and Charmonium Decays |
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Authors: | Kuang-Ta CHAO Yi-Fan GU S F TUAN |
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Institution: | 1. Department of Physics, Peking University, Beijing 100871, China;
2. Center of Theoretical Physics, CCAST (World Laboratory), Beijing 100080, China;
3. Institute of Theoretical Physics, Academia Sinica, Beijing 100080, China;
4. Institute of High Energy Physics, Academia Sinica, Beijing 100039, China;
5. Department of Physics, University of Hawaii at Manoa, Honolulu, USA |
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Abstract: | We discuss the search for a 1-- gluonium state, 0, in connection with a possible solution for the so-called ρπ, K*K puzzle in the J/φ and φ' decays. Some issues are examined. In particular, we argue that the expected most favorable process φ → ππO can have an appreciable branching ratio (say 10-3 ~ 10-4) only if the O has a very narrow partial decay width to ρπ (say 1 ~ 10 MeV). For the 0-+ system we deduce a relation that BR(η'c → h) ≈ BR (ηc → h), where h denotes an exclusive light hadronic channel. This relation may be useful for the experimental search of the yet to be confirmed q: state, for which the branching ratios of φ' → η'c → γKKπ, γηππ, γη'ππ are estimated to be about 1 × 10-4 if the mass of η'c is around 3600 MeV, and this relation may also serve as a criterion to determine whether there exist anomalous decays in the ηc and η'c system, in particular in the VV decay channels, which might be related to the 0-+ glueball-charmonium mixing. We emphasize that the bigluonium and the trigluonium may have very different effects on these decays. |
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