Productions of X(1835) as baryonium with sizable gluon content |
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Authors: | Gui-Jun Ding Rong-Gang Ping Mu-Lin Yan |
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Institution: | (1) Interdisciplinary Center for Theoretical Study, University of Science and Technology of China, 230026 Hefei, Anhui, PRC;(2) Institute of High Energy Physics, 918(4), 100049 Beijing, PRC |
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Abstract: | X(1835) has been treated as a baryonium with sizable gluon content, and to be almost flavor singlet. This picture allows us
to rationally understand X(1835) production in J/ψ radiative decays, and its large couplings with pˉ, η′ππ. The processes ϒ(1S) → γX(1835) and J/ψ → ωX(1835) have been examined. It has been found that Br(ϒ(1S) → γX(1835))Br(X(1835) → pˉ) < 6.45×10-7, which is compatible with CLEO's recent experimental result (Phys. Rev. D 73, 032001 (2006) hep-ex/0510015). The branching fractions Br(J/ψ → ωX(1835)), Br(J/ψ → ρX(1835)) with X(1835) → pˉ and X(1835) → η′π+π- have been estimated by the quark-pair creation model. We show that they are heavily suppressed, so the signal of X(1835) is very difficult, if not impossible, to be observed in these processes. The experimental checks for these estimations
are expected. The existence of the baryonium nonet is conjectured, and a model-independent derivation of their production
branching fractions is presented. |
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Keywords: | 12 38 -t Quantum chromodynamics 12 38 Qk Experimental tests 12 39 Mk Glueball and nonstandard multi-quark/gluon states 12 39 St Factorization |
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