Analysis of the X(1835) and related baryonium states with Bethe-Salpeter equation

Abstract

In this article, we study the mass spectrum of the baryon-antibaryon bound states $p\bar{p}$, $\Sigma \bar{\Sigma }$, $\Xi \bar{\Xi }$, $\Lambda \bar{\Lambda }$, $p\bar{N}(1440)$, $\Sigma \bar{\Sigma }(1660)$, $\Xi {\bar{\Xi }}^{\prime }$ and $\Lambda \bar{\Lambda }(1600)$ with the Bethe-Salpeter equation. The numerical results indicate that the $p\bar{p}$, $\Sigma \bar{\Sigma }$, $\Xi \bar{\Xi }$, $p\bar{N}(1440)$, $\Sigma \bar{\Sigma }(1660)$, $\Xi {\bar{\Xi }}^{\prime }$ bound states maybe exist, and the new resonances X(1835) and X(2370) can be tentatively identified as the $p\bar{p}$ and $p\bar{N}(1440)$ (or $N(1400)\bar{p}$) bound states respectively with some gluon constituents, and the new resonance X(2120) may be a pseudoscalar glueball. On the other hand, the Regge trajectory favors identifying the X(1835), X(2120) and X(2370) as the excited ${\eta }^{\prime }(958)$ mesons with the radial quantum numbers $n=3$, 4 and 5, respectively.

Comments: 13 pages, 2 figures, revise a number