Hadronic Decays Involving Heavy Pentaquarks

Abstract

Recently several experiments have reported evidences for pentaquark $Θ^+$. H1 experiment at HERA-B has also reported evidence for $Θ_c$. $Θ^+$ is interpreted as a bound state of an $\bar s$ with other four light quarks $udud$ which is a member of the anti-decuplet under flavor $SU(3)_f$. While $Θ_c$ is a state by replacing the $\bar s$ in $Θ^+$ by a $\bar c$. One can also form $Θ_b$ by replacing the $\bar s$ by a $\bar b$. The charmed and bottomed heavy pentaquarks form triplets and anti-sixtets under $SU(3)_f$. We study decay processes involving at least one heavy pentaquark using $SU(3)_f$ and estimate the decay widths for some decay modes. We find several relations for heavy pentaquarks decay into another heavy pentaquark and a $B (B^*)$ or a $D(D^*)$ which can be tested in the future. $B$ can decay through weak interaction to charmed heavy pentaquarks. We also study some $B$ decay modes with a heavy pebtaquark in the final states. Experiments at the current $B$ factories can provide important information about the heavy pentaquark properties.

RevTex 20 pages. Revised version. Discussions on the recent H1 data and new references added