Productions of X(1835) as baryonium with sizable gluon content
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
Accepted: 30 May 2006
Published online: 3 July 2006
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 p¯, 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) → p¯) < 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) → p¯ 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.
PACS: 12.38.-t Quantum chromodynamics – / 12.38.Qk Experimental tests – / 12.39.Mk Glueball and nonstandard multi-quark/gluon states – / 12.39.St Factorization –
© Società Italiana di Fisica and Springer-Verlag, 2006