Eur. Phys. J. A (2021) 57: 237
https://doi.org/10.1140/epja/s10050-021-00542-4

Regular Article - Theoretical Physics

Hidden charm pentaquark states in a diquark model

¹ School of Nuclear Science and Technology, University of Chinese Academy of Sciences, 101408, Beijing, China
² CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 100190, Beijing, China
³ School of Physics, Beihang University, 100191, Beijing, China

^c wangwenling@buaa.edu.cn

Received: 7 March 2021
Accepted: 28 June 2021
Published online: 18 July 2021

Abstract

The mass spectrum of hidden charm pentaquark states composed of two diquarks and an antiquark are calculated by use of an effective Hamiltonian which includes explicitly the spin, color, and flavor dependent interactions. The results show that the $P_c{(4312)}^{+}$ and $P_c{(4440)}^{+}$ states could be explained as hidden charm pentaquark states with isospin and spin-parity $I{J}^P=1/2(3/2^{-})$, the $P_c{(4457)}^{+}$ state could be explained as a hidden charm pentaquark state with $I{J}^P=1/2(5/2^{-})$, and the $P_{\mathit{cs}}{(4459)}^{+}$ state could be explained as a hidden charm pentaquark state with $I{J}^P=0(1/2^{-})$ or $0(3/2^{-})$. Predications for the masses of other possible pentaquark states are also given, and the possible decay channels of these hidden charm pentaquark states are discussed.