Baryonia and near-threshold enhancements

Abstract

The baryon-antibaryon spectrum consisting of strange, charm and bottom quarks is studied in the color flux-tube model with a multi-body confinement interaction. Numerical results indicate that many low-spin baryon-antibaryon states can form compact hexaquark states and are stable against the decay into a baryon and an antibaryon. The multi-body confinement interaction as a binding mechanism plays an important role in the formation of the states. They can be searched in the $e^{+}{e}^{-}$ annihilation and charmonium or bottomonium decay if they really exist. The newly reported states, X(1835), X(2370), Y(2175), Y(4360) and Y_b(10890), may be interpreted as $N\bar{N}$, $\Delta \bar{\Delta }$, $\Lambda \bar{\Lambda }$, ${\Lambda }_c{\bar{\Lambda }}_c$ and ${\Lambda }_b{\bar{\Lambda }}_b$ states, respectively.

Comments: 8 pages, 3 figures