Speaker
Dr
Alexandr Pimikov
Description
We study the hidden-charm pentaquark states $udsc\bar{c}$ with spins 1/2, 3/2, and 5/2 within the QCD sum-rule approach. We construct the currents for the particular configuration of the pentaquark states that consist of the flavor singlet three-quark cluster $uds$ of spins 1/2 and 3/2 and the two-quark cluster $\bar cc$ of spin 1, where both clusters are in a color-octet state. From the QCD sum rules, obtained by the operator product expansion up to dimension-10 condensates, we have extracted masses for the pentaquark states
$udsc\bar{c}$ and $udcu\bar c$.
