Narrow width of a glueball decay into two mesons

Abstract

The widths of a glueball decay to two pions or kaons are analyzed in the pQCD framework. Our results show that the glueball ground state has small branching ratio for two-meson decay mode, which is around $10^{-2}$. The predicted values are consistent with the data of $\xi \to \pi \pi ,KK$ if $\xi$ particle is a $2^{++}$ glueball. Applicability of pQCD to the glueball decay and comparison with ${\chi }_{cJ}$ decay are also discussed.

Comments: 12 pages, revtex, 2 ps figures