Zhu Shilin

Understanding Possible Proton-Antiproton Enhancement Observed by BES Collaboration*

We comment on the quantum numbers and decay channels of the proton-antiproton enhancement observed by BES Collaboration. Based on the general symmetry consideration and available experimental information, we suggest that the quantum number of this possible signal is very likely to be which cannot decay into final states Besides its dissociation into the other important mesonic decay modes could be Experimental search of this signal in these meson final states is strongly called for.

Dispersive Contribution of ρ(1450,1700) Decays and X(1576)

We study whether the broad enhancement X(1576) arises from the final state interaction (FSI) of

X（1835）： A Possible Baryonium？

\rho(1450,1700)\to \rho^+\rho^-\to K^{+}K^{-}

Dipion decays of heavy baryons

decays. We consider both the absorptive and dispersive contribution of the above amplitudes since the intermediate states are very close to

The Possible

\rho(1450,1700)

J^{PC} = 0^{+-}

. The same mechanism leads to a similar enhancement around 1580 MeV in the

Exotic State

\pi^{+}\pi^-

Possible heavy molecular states composed of a pair of excited charm-strange mesons

spectrum in the

Large N{sub c} expansion and the parity-violating {pi}, N, {delta} couplings

J/\psi\to \pi^{0}\pi^{+}\pi^{-}

Physics on the high intensive electron position accelerator at 2–7 GeV

channel, which can be used to test whether X(1576) can be ascribed to the FSI effect of