arXiv 2009.100342020-09hep-lathep-ph

QCD中奇异$1^{-+}$混合介子共振的衰变

Decays of an exotic $1^{-+}$ hybrid meson resonance in QCD

Antoni J. Woss, Jozef J. Dudek, Robert G. Edwards, Christopher E. Thomas, David J. Wilson

备注：: 33 pages, 20 figures, small changes to match published version
发表信息：: Phys. Rev. D 103, 054502 (2021)
DOI：: 10.1103/PhysRevD.103.054502

摘要：

首次测定了格点QCD中最轻奇异$J^{PC}=1^{-+}$共振的强子衰变。在SU（3）味对称下，上夸克、下夸克和奇夸克的质量与物理奇夸克质量近似匹配，给出$m_π\sim 700$ MeV，我们计算了六个格点体积上的有限体积谱，这些格点体积约束了一个具有八个耦合通道的散射系统。分析继续到复杂的能量平面的散射振幅，我们发现一个极奇异对应于一个狭窄的共振，显示相对较弱的耦合到开放的赝标-赝标，矢量-赝标和矢量-矢量衰变通道，但大耦合到至少一个运动学封闭的轴向矢量-赝标通道。尝试简单地将耦合外推到物理光夸克质量，表明$π_1$共振主要通过$b_1 π$模式衰减，而衰减到$f_1 π$、$ρπ$、$η' π$和$ηπ$的频率要小得多。一个大的总宽度是潜在的协议与实验$π_1(1564)$候选国，观察到的$ηπ$，$η' π$，我们认为可能是严重抑制衰变通道。

英文摘要：

We present the first determination of the hadronic decays of the lightest exotic $J^{PC}=1^{-+}$ resonance 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 $m_π\sim 700$ MeV, 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 broad $π_1$ resonance decaying dominantly through the $b_1 π$ mode with much smaller decays into $f_1 π$, $ρπ$, $η' π$ and $ηπ$. A large total width is potentially in agreement with the experimental $π_1(1564)$ candidate state, observed in $ηπ$, $η' π$, which we suggest may be heavily suppressed decay channels.

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。

摘要：

英文摘要：

相关论文