Fully-heavy pentaquark states

TL;DR

This paper predicts the masses of fully-heavy pentaquark states using QCD sum rules, providing theoretical guidance for experimental searches in specific invariant mass spectra.

Contribution

It introduces a calculation method for fivefold heavy hadrons and predicts masses of fully-heavy pentaquark states based on QCD sum rules.

Findings

Mass of $cccc\bar{c}$ pentaquark: approximately 7.41 GeV

Mass of $bbbb\bar{b}$ pentaquark: approximately 21.60 GeV

Suggested experimental search channels in $\\Omega_{QQQ}\eta_{Q}$ spectrum

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 $7.41^{+0.27}_{-0.31}~\mbox{GeV}$ for $cccc\bar{c}$ and $21.60^{+0.73}_{-0.22}~\mbox{GeV}$ 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.