Decays of an exotic 1 - + hybrid meson resonance in QCD
Decays of an exotic 1 - + hybrid meson resonance in QCD
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QCD 中奇异的 1 - 杂化介子共振的衰变
DOI：
10.1103/physrevd.103.054502
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发表时间：
2021
影响因子：
5
通讯作者：
Woss A
中科院分区：
文献类型：
--
作者：
Woss A
我们首次确定了晶格QCD中最轻的奇异共振的强子衰变。利用SU(3)味道对称性，即上、下、奇异夸克质量近似匹配物理奇异夸克质量，我们计算了六个晶格体积的有限体积谱，这些体积约束了一个由八个耦合通道组成的散射系统。将散射振幅解析地延续到复能面上，我们发现了一个对应于窄共振的极点奇点，它与开放的伪标量-伪标量、矢量-伪标量和矢量-矢量衰变通道的耦合相对较弱，但与至少一个运动闭合的轴-矢量-伪标量通道的耦合较大。尝试对物理轻夸克质量的耦合进行简单的外推，可以发现主要通过模型的宽谐振衰变，而衰变到、和的衰变要小得多。较大的总宽度可能与在中观察到的实验候选态一致，我们认为这可能是严重抑制的衰变通道。
We present the first determination of the hadronic decays of the lightest exoticresonance in lattice QCD. Working with SU(3) flavor symmetry, where the up, down and strange-quark masses approximately match the physical strange-quark mass giving, we compute finite-volume spectra on six lattice volumes which constrain a scattering system featuring eight coupled channels. Analytically continuing the scattering amplitudes into the complex-energy plane, we find a pole singularity corresponding to a narrow resonance which shows relatively weak coupling to the open pseudoscalar–pseudoscalar, vector–pseudoscalar and vector–vector decay channels, but large couplings to at least one kinematically closed axial-vector–pseudoscalar channel. Attempting a simple extrapolation of the couplings to physical light-quark mass suggests a broadresonance decaying dominantly through themode with much smaller decays into,,and. A large total width is potentially in agreement with the experimentalcandidate state observed in,, which we suggest may be heavily suppressed decay channels.