论文标题
新发现的$ξ_c^{0} $共振及其参数
Newly discovered $Ξ_c^{0}$ resonances and their parameters
论文作者
论文摘要
本文的目的是调查新观察到的共振$ξ_c（2923）^{0} $，$ξ_c（2939）^{0} $，和$ξ_c（2965）^{0} $，是对Charm-Strange Baryons的真正候选人。为此，我们计算地面状态的质量和杆残留物，$ 1p $和$ 2S $ spin-$％1/2 $ aveage-sextet baryons $ξ_{c} {c}^{\ prime 0} $，$蒜0}（1/2^{+}）$带有Quark Content $ CSD $。也发现了地面状态的质量和极点残留物和激动的旋转 - $ 3/2 $ baryons $ξ_{c}^{\ star 0} $。这些粒子的光谱参数是在QCD两点总规则方法的上下文中计算的。激发重子的宽度会在其衰减中评估到最终状态$λ_{c}^{+} k^{ - } $和$％ξ_{c} {c}^{\ prime 0}π$。这些过程是通过确定相关顶点上强耦合所需的完整QCD轻单和规则方法探索的。获得了四个激动人心的baryons的质量和宽度的预测，以及先前的结果，价格为$ 1p $和$ 2S $ aveale-antitriplet spin-1/2粒子$ξ_c^{0} $，都面临着可用的实验数据，以$ξ_{c}^{0} $ resonances来修复其量子数字。我们的比较表明，共鸣$ξ_c（2923）^{0} $和$ξ_c（2939）^{0} $分别被视为$ 1P $ spin- $ 1/2 $ floation-sextet和spin- $ 3/2 $ baryons的刺激。共振$ξ_{c}（2965）^{0} $可以解释为旋转的激动$ 2S $状态 - $％1/2 $ aveage-sextet或antitriplet baryon。
The aim of the present article is investigation of the newly observed resonances $Ξ_c(2923)^{0}$, $Ξ_c(2939)^{0}$, and $Ξ_c(2965)^{0}$ which are real candidates to charm-strange baryons. To this end, we calculate the mass and pole residue of the ground-state and excited $1P$ and $2S$ spin-$% 1/2 $ flavor-sextet baryons $Ξ_{c}^{\prime 0}$, $Ξ_{c}^{\prime 0}(1/2^{-})$ and $Ξ_{c}^{\prime 0}(1/2^{+})$ with quark content $csd$, respectively. The masses and pole residues of the ground-state and excited spin-$3/2$ baryons $Ξ_{c}^{\star 0}$ are found as well. Spectroscopic parameters of these particles are computed in the context of the QCD two-point sum rule method. Widths of the excited baryons are evaluated through their decays to final states $Λ_{c}^{+}K^{-}$ and $% Ξ_{c}^{\prime 0}π$. These processes are explored by means of the full QCD light-cone sum rule method necessary to determine strong couplings at relevant vertices. Obtained predictions for the masses and widths of the four excited baryons, as well as previous results for $1P$ and $2S$ flavor-antitriplet spin-1/2 particles $Ξ_c^{0}$ are confronted with available experimental data on $Ξ_{c}^{0}$ resonances to fix their quantum numbers. Our comparison demonstrates that the resonances $Ξ_c(2923)^{0}$ and $Ξ_c(2939)^{0}$ can be considered as $1P$ excitations of the spin-$1/2$ flavor-sextet and spin-$3/2$ baryons, respectively. The resonance $Ξ_{c}(2965)^{0}$ may be interpreted as the excited $2S$ state of either spin-$% 1/2$ flavor-sextet or antitriplet baryon.
