论文标题
完全稳固的四夸克人进入di-charmonia
Strong decays of fully-charm tetraquarks into di-charmonia
论文作者
论文摘要
我们研究了LHCB最近观察到的可能的全链四夸克的强烈衰变，并通过FIFEZ重排计算其相对分支比率。与我们以前的QCD总规则研究[物理学。 Lett。 B 773，247（2017）]，我们的结果表明，$ 6.2 $ - $ 6.8 $ GEV的广泛结构可以解释为$ s $ -s $ -cc \ bar c \ bar c \ bar c $ bar c $ tetraquark State，具有$ j^{pc} {pc} = 0^{++} $或$ 2^{+2^{+2^{+2^{+2^{+2^{+a $ 6.9 $ j^{pc} = 0^{ - +} $或$ 1^{ - +} $。这些结构是在di-$ j/ψ$不变质量谱中观察到的，我们建议在di- $η_c$，$ j/ψh_c$，$η_cχ_{c0} $和$η_cc1 {c1 {c1} $ Channels中确认它们。我们还建议在$ j/ψη_c$，$ j/ψχ_{c0} $，$ j/ψχ_{c1} $和$η_ch_c h_c $ channels中搜索其合作伙伴状态。
We study strong decays of the possible fully-charm tetraquarks recently observed by LHCb, and calculate their relative branching ratios through the Fierz rearrangement. Together with our previous QCD sum rule study [Phys. Lett. B 773, 247 (2017)], our results suggest that the broad structure around $6.2$-$6.8$ GeV can be interpreted as an $S$-wave $cc\bar c \bar c$ tetraquark state with $J^{PC} = 0^{++}$ or $2^{++}$, and the narrow structure around 6.9 GeV can be interpreted as a $P$-wave one with $J^{PC} = 0^{-+}$ or $1^{-+}$. These structures were observed in the di-$J/ψ$ invariant mass spectrum, and we propose to confirm them in the di-$η_c$, $J/ψh_c$, $η_c χ_{c0}$, and $η_c χ_{c1}$ channels. We also propose to search for their partner states having the negative charge-conjugation parity in the $J/ψη_c$, $J/ψχ_{c0}$, $J/ψχ_{c1}$, and $η_c h_c$ channels.
