1. Possibility of charmoniumlike state X(3915) as χc0(2P) state
- Author
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Ming-Xiao Duan, Takayuki Matsuki, Si-Qiang Luo, and Xiang Liu
- Subjects
Physics ,010308 nuclear & particles physics ,0103 physical sciences ,Quark model ,Mass spectrum ,State (functional analysis) ,010306 general physics ,Mass spectrum analysis ,01 natural sciences ,Mass gap ,Mathematical physics - Abstract
In this work, we seriously discuss whether $X(3915)$ can be treated as a ${\ensuremath{\chi}}_{c0}(2P)$ state. Based on an unquenched quark model, we give the mass spectrum of the ${\ensuremath{\chi}}_{cJ}(2P)$ states, where there are no free input parameters in our calculation. Our result shows that the mass gap between ${\ensuremath{\chi}}_{c0}(2P)$ and ${\ensuremath{\chi}}_{c2}(2P)$ can reach 13 MeV, which can reproduce the mass difference between $Z(3930)$ and $X(3915)$. Additionally, the calculated masses of ${\ensuremath{\chi}}_{c0}(2P)$ and ${\ensuremath{\chi}}_{c2}(2P)$ are consistent with experimental values of $X(3915)$ and $Z(3930)$, respectively. Besides, giving the mass spectrum analysis to support $X(3915)$ as ${\ensuremath{\chi}}_{c0}(2P)$, we also calculate the width of ${\ensuremath{\chi}}_{c0}(2P)$ with the same framework, which is also consistent with the experimental data of $X(3915)$. Thus, the possibility of charmoniumlike state $X(3915)$ as ${\ensuremath{\chi}}_{c0}(2P)$ state is further enforced.
- Published
- 2020