Eur. Phys. J. A (2006) 28: 351-360
https://doi.org/10.1140/epja/i2006-10055-3

Hadron Physics

Productions of X(1835) as baryonium with sizable gluon content

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

Received: 8 April 2006
Accepted: 30 May 2006
Published online: 3 July 2006

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 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.