论文标题
了解新观察到的$ξ_c^0 $状态通过其衰减
Understanding the newly observed $Ξ_c^0$ states through their decays
论文作者
论文摘要
受LHCB合作的新观察到的$ξ_c^0 $状态的启发，我们研究了$λ$ -Mode $ 1p $ 1p $ wave $ wave $ξ'_c$状态的Ozi允许的两体强衰变。我们的结果表明：（i）新观察的状态$ξ_c（2923）^0 $和$ξ_c（2939）^0 $是$λ$ -Mode $ 1p $ 1p $ 1p $ 1p $ wave $ wave $之一，带有spin-parity $ j^p = 3/2^ - $ $ | $ |^2p_λ3/2^ - \ rangle $。 （ii）另一个新观察到的状态$ξ_c（2965）^0 $主要对应于$λ$ -MODE $ 1P $ -WAVE $ -WAVE $ -PAWAVE $ξ'_C$状态，带有Spin-Parity $ J^p = 5/2^ - $，即$ |^4p_λ5/2^ - \ rangle $。 （iii）对于两个$λ$ -Mode $ j^p = 1/2^ - $混合状态，$ | p_λ〜1/2^ - \ rangle_1 $是一个狭窄的状态，宽度为$γ\ sim15 $ mev，主要腐烂到$ξ'_cπ$;而$ | p_λ〜1/2^ - \ rangle_2 $状态的宽度为$γ\ sim52 $ mev，并且主要衰减到$ξ_cπ$和$λ_ck$ channels中。如果在LHCB上观察到的$ 2880 MEV的宽结构来自新的$ξ^0_c $状态，则此状态很可能是$ | p_λ〜1/2^ - \ rangle_2 $状态。
Inspired by the newly observed $Ξ_c^0$ states by the LHCb Collaboration, we investigate the OZI-allowed two-body strong decays of the $λ$-mode $1P$ wave $Ξ'_c$ states within the chiral quark model. Our results indicate that: (i) the newly observed states $Ξ_c(2923)^0$ and $Ξ_c(2939)^0$ are good candidates of the $λ$-mode $1P$ wave $Ξ'_c$ states with the spin-parity $J^P=3/2^-$, namely $|^4P_λ3/2^-\rangle$ and $|^2P_λ3/2^-\rangle$, respectively. (ii) The another newly observed state $Ξ_c(2965)^0$ mostly corresponds to the $λ$-mode $1P$-wave $Ξ'_c$ state with the spin-parity $J^P=5/2^-$, namely $|^4P_λ5/2^-\rangle$. (iii) For the two $λ$-mode $J^P=1/2^-$ mixed states, the $|P_λ~1/2^-\rangle_1$ is a narrow state with a width of $Γ\sim15$ MeV and mainly decays into $Ξ'_cπ$; while the $|P_λ~1/2^-\rangle_2$ state has a width of $Γ\sim52$ MeV and dominantly decays into $Ξ_cπ$ and $Λ_cK$ channels. If the broad structure around $2880$ MeV observed at LHCb arises from the new $Ξ^0_c$ state, this state is very likely to be the $|P_λ~1/2^-\rangle_2$ state.
