论文标题
关于$ z_ {cs} $的外来结构
About the exotic structure of $Z_{cs}$
论文作者
论文摘要
最近，在BESIII实验中观察到了一个新的HADRONIC结构约3.98美元的GEV。从其衰减模式中，人们可以将其分配给异国情调的类别，例如$ z^+_ {cs} $，$ z_ {c}（c}（3900）$的陌生部分。这一发现首次表明了魅力部门中具有奇怪夸克的异国情调状态，因此具有特殊的重要性。借助QCD总规则技术，我们分析了$ z^+_ {cs} $关于其可能的配置和物理属性的，并发现它可以被配置为两种类型的结构的混合物，$ [1_c] _ {\ bar {c} c} c} u {c} u} $ [1_c] _ {\ bar {c} c} \ otimes [1_c] _ {\ bar {s} u} $，或$ [3_c] _ {\ bar {c} u} $ [3_c] _ {\ bar {c} c} \ otimes [\ bar {3} _c] _ {\ bar {s} u} $，带有$ j^p = 1^+$。从物理上讲，这似乎是每种构型中四个可能电流的化合物的出现，该化合物说明了对强子光谱的单个电流评估，并且它们的衰减特性有时不够。我们发现，在这两种情况下，能量光谱都可能与实验观察结果（即3.98美元的GEV）在不确定性中非常吻合，而指出前者并不受Vector Meson Exchange模型的青睐。评估了各种$ z^+_ {CS}（3980）$衰减模式，这对于固定其配置至关重要，并保留用于实验验证。我们还预测$ z^0_ {CS} $的质量，$ z^+_ {cs}（3980）$的中性合作伙伴，并分析其主要的衰减概率。
Very recently a new hadronic structure around $3.98$ GeV was observed in BESIII experiment. From its decay modes, it is reasonable for people to assign it to the category of exotic state, say $Z^+_{cs}$, the stranged-parter of $Z_{c}(3900)$. This finding indicates for the first time the exotic state with strange quark in charm sector, and hence has a peculiar importance. By virtue of the QCD Sum Rule technique, we analyze the $Z^+_{cs}$ about its possible configuration and physical properties, and find it could be configured as a mixture of two types of structures, $[1_c]_{\bar{c} u}\otimes[1_c]_{\bar{s} c}$ and $[1_c]_{\bar{c} c}\otimes[1_c]_{\bar{s} u}$, or $[3_c]_{\bar{c} u}\otimes[\bar{3}_c]_{\bar{s} c}$ and $[3_c]_{\bar{c} c}\otimes[\bar{3}_c]_{\bar{s} u}$, with $J^P=1^+$. Physically, it then appears to be the emergence of a compound of four possible currents in each configuration, which tells the single current evaluation of hadron spectroscopy and their decay properties are sometimes not enough. We find in both cases the energy spectra may fit well with the experimental observation, i.e. $3.98$ GeV, within the uncertainties, while noted the former is not favored by vector meson exchange model. Various $Z^+_{cs}(3980)$ decay modes are evaluated, which are critical for pinning down its configuration and left for experimental verification. We also predict the mass of $Z^0_{cs}$, the neutral partner of $Z^+_{cs}(3980)$, and analyze its dominant decay probabilities.
