Pc pentaquarks with chiral tensor and quark dynamics
Pc pentaquarks with chiral tensor and quark dynamics
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DOI：
10.1103/physrevd.101.091502
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发表时间：
2019-07
影响因子：
5
通讯作者：
Y. Yamaguchi;H. García-Tecocoatzi;A. Giachino;A. Hosaka;E. Santopinto;S. Takeuchi;M. Takizawa
中科院分区：
文献类型：
--
作者：
Y. Yamaguchi;H. García-Tecocoatzi;A. Giachino;A. Hosaka;E. Santopinto;S. Takeuchi;M. Takizawa
通过采用满足重夸克和手征对称性的相互作用，我们将${\mathrm{\ensuremath{\Lambda}}}_{c}{\overline{D}}^{(*)}$和${\mathrm{\ensuremath{\Sigma}}}_{c}^{(*)}{\overline{D}}^{(*)}$(同位旋$i=1/2$)介子-重子通道叠加到一个紧凑的核上，研究了隐藏魅力的五夸克。我们的模型可以一致地解释${P}_{c}^{+}(4312)$的质量和衰变宽度，${P}_{c}^{+}(4440)$和${P}_{c}^{+}(4457)$，具有${\mathrm{\ensuremath{\Sigma}}}_{c}\overline{D}$和${\mathrm{\ensuremath{\Sigma}}}_{c}{\overline{D}}^{*}$的主要成分，具有自旋宇称分配${J}^{P}=1/{2}^{\ensuremath{-}}$，分别为$3/{2}^{\ensureath{-}}$和$1/{2}^{\ensureath{-}}$。我们分析了S粒子的质量和衰变宽度等基本性质，发现质量有序主要由夸克动力学决定，而衰变宽度主要由单π交换的张量力决定。
We investigate the hidden-charm pentaquarks as superpositions of ${\mathrm{\ensuremath{\Lambda}}}_{c}{\overline{D}}^{(*)}$ and ${\mathrm{\ensuremath{\Sigma}}}_{c}^{(*)}{\overline{D}}^{(*)}$ (isospin $I=1/2$) meson-baryon channels coupled to a $uudc\overline{c}$ compact core by employing an interaction satisfying the heavy quark and chiral symmetries. Our model can consistently explain the masses and decay widths of ${P}_{c}^{+}(4312)$, ${P}_{c}^{+}(4440)$ and ${P}_{c}^{+}(4457)$ with the dominant components of ${\mathrm{\ensuremath{\Sigma}}}_{c}\overline{D}$ and ${\mathrm{\ensuremath{\Sigma}}}_{c}{\overline{D}}^{*}$ with spin-parity assignments ${J}^{P}=1/{2}^{\ensuremath{-}}$, $3/{2}^{\ensuremath{-}}$ and $1/{2}^{\ensuremath{-}}$, respectively. We analyze basic properties of the ${P}_{c}$'s such as masses and decay widths, and find that the mass ordering is dominantly determined by the quark dynamics while the decay widths by the tensor force of the one-pion exchange.