arXiv 1809.089022018-09-24hep-phhep-lat

手征对称性对重轻介子谱的影响

Implication of chiral symmetry for the heavy-light meson spectroscopy

Meng-Lin Du

备注：: Talk presented CIPANP2018. 9 pages, LaTeX, 3 pdf figures

摘要：

2003年以来观测到的许多强子态，特别是正宇称粲奇异态$D_{s0}^\ast (2317)$和$D_{s1}(2460)$，与传统夸克模型的预期不符，给粲介子谱研究带来了诸多难题.我们证明，这些难题找到一个自然的解决方案，由于最近的发展手征有效的理论和晶格模拟。$D_{s0}^\ast (2317)$和$D_{s1}(2460)$的存在归因于Goldstone玻色子对$D$和$D^\ast$介子散射的非微扰动力学。指出《粒子物理评论》中的最低正宇称非奇异标量粲介子，即$D_0^\ast(2400)$，应该用两个态代替。构造良好的振幅与$B^-\to D^+π^-π^-$和$D_s^0\to \bar{D}^0K^-π^+$衰变的高质量数据完全一致。这意味着最低的正宇称态是动态产生的，而不是传统的夸克-反夸克态。对于由轻夸克（$u$、$d$和$s$夸克）构成的标量和轴矢量介子，也建立了这种模式。

英文摘要：

Many hadronic states observed since 2003, especially for the positive-parity charm-strange states $D_{s0}^\ast (2317)$ and $D_{s1}(2460)$, do not conform with the conventional quark model expectations and raise various puzzles in charm meson spectroscopy. We demonstrate that those puzzles find a natural solution thanks to the recent development of chiral effective theory and Lattice simulations. The existence of the $D_{s0}^\ast (2317)$ and $D_{s1}(2460)$ are attributed to the nonperturbative dynamics of Goldstone bosons scattering off $D$ and $D^\ast$ mesons. It indicates that the lowest positive parity nonstrange scalar charm mesons, the $D_0^\ast(2400)$ in the Review of Particel Physics, should be replaced by two states. The well constructed amplitudes are fully in line with the high quality data on the decays $B^-\to D^+π^-π^-$ and $D_s^0\to \bar{D}^0K^-π^+$. This implies that the lowest positve-parity states are dynamically generated rather than conventional quark-antiquark states. This pattern has also been established for the scalar and axial-vector mesons made from light quarks ($u$, $d$ and $s$ quarks).

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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