Fully-heavy pentaquark states

Abstract

Developing the calculation techniques to fivefold heavy hadrons, we perform the study of novel fully-heavy $QQQQ\bar{Q}$ pentaquark states by the QCD sum rule approach that is firmly based on the QCD basic theory. Numerically, masses of fully-heavy pentaquark states are calculated to be $7.41_{-0.31}^{+0.27}\text{mbox}GeV$ for $cccc\bar{c}$ and $21.60_{-0.22}^{+0.73}\text{mbox}GeV$ for $bbbb\bar{b}$, respectively. In experiment, these predicted all-heavy pentaquark states could be searched for in the ${\Omega }_{QQQ}{\eta }_Q$ invariant mass spectrum.

Comments: 6 pages, 3 figures; version accepted for publication in Phys. Rev. D