Mass spectra of four quark states in hidden charm sector

Understand

Masses of the low lying four quark states in the hidden charm sector ($cq\bar c \bar q; q\in u,d$) are calculated within the framework of a non-relativistic quark model.

• The four body system is considered as two two-body systems such as diquark-antidiquark ($Qq-\bar Q \bar q$) and quark antiquark-quark antiquark ($Q\bar q -\bar Qq$) molecular-like four quark states.
• Here, Cornell type potential has been used for describing the two body interactions among $Q-q$, $\bar Q-\bar q$, $Q-\bar q$, $Qq-\bar Q \bar q$ and $Q\bar q-\bar Qq$, with appropriate string tensions.
• Our present analysis suggests the following exotic states, $X(3823)$, $Z_c(3900)$, $X(3915)$, $Z_c(4025)$, $\psi(4040)$, $Z_1(4050)$ and $X(4160)$ as $Q\bar q-\bar Qq$ molecular-like four quark states while $Z_c(3885)$, $X(3940)$ and $Y(4140)$ as the diquark-antidiquark four quark states.