论文标题
$λ_b\ to j/ψpk^ - $的强子光谱的极点分析
Pole analysis on the hadron spectroscopy of $Λ_b\to J/Ψp K^-$
论文作者
论文摘要
在本文中，我们研究了$ J/ψP$光谱，以$λ_b\ \ j/ψpk^ - $进行。耦合通道$ j/ψp$〜-〜$ \ bar {d}σ_c$〜-〜$ \ bar {d}^{*}σ_c$的最终状态相互作用是基于k-matrix构建的。根据Au-Morgan-Pennington方法，我们将$λ_b\ \ to j/ψpk^ - $振幅构建。事件形状已拟合，$λ_b\ \ to j/ψpk^ - $的衰减宽度也用于约束参数。随着幅度，我们提取杆子及其残留物。我们的振幅和极点分析表明，$ p_c（4312）$应为$ \ bar {d}σ_c$分子，$ p_c（4440）$可能是S-Wave紧凑型Pentaquark州，并且围绕$ P_C（4457）$的结构是由CUSP效应引起的。 $λ_b\ to \ bar {d}σ_ck^ - $和$λ_b\ to \ bar {d}^*σ_ck^ - $的未来实验测量值将进一步帮助研究这些共振的性质。
In this paper we study the $J/Ψp$ spectroscopy in the process of $Λ_b\to J/Ψp K^-$. The final state interactions of coupled channel $J/Ψp$ ~-~ $\bar{D} Σ_c$~-~$\bar{D}^{*} Σ_c$ are constructed based on K-matrix with the Chew-Mandelstam function. We build the $Λ_b\to J/Ψp K^-$ amplitude according to the Au-Morgan-Pennington method. The event shape is fitted and the decay width of $Λ_b\to J/Ψp K^-$ is used to constrain the parameters, too. With the amplitudes we extract out the poles and their residues. Our amplitude and pole analysis suggest that the $P_c(4312)$ should be $\bar{D}Σ_c$ molecule, the $P_c(4440)$ could be an S-wave compact pentaquark state, and the structure around $P_c(4457)$ is caused by the cusp effect. The future experimental measurement of the decays of $Λ_b\to \bar{D}Σ_c K^-$ and $Λ_b\to \bar{D}^*Σ_c K^-$ would further help to study the nature of these resonances.
