非对称晶格上$ρ$介子衰变
$ρ$ meson decay on asymmetrical lattices
摘要：
本文用格点量子色动力学方法计算了$ρ$介子衰变的特性。研究进行了空间不对称盒使用nHYP涂抹三叶草费米子在淬火近似。本文用P波散射相移计算了I=1的2 π介子系统的共振质量和耦合常数。我们使用π介子质量m_π= 418 MeV和m_π=312 MeV。在这两种情况下，$ρ$衰减在运动学上是可行的。我们研究的晶格尺寸为N_z × 24^2 × 48，晶格间距a=0.1 fm，N_z= 24，30，34，48。
英文摘要：
We present a lattice QCD calculation of the characteristics of the $ρ$ meson decay. The study is carried out on spatially asymmetric boxes using nHYP-smeared clover fermions in the quenched approximation. The resonance mass and coupling constant are calculate using the P-wave scattering phaseshifts, of the isospin I=1 two-pion system. We use pion masses m_π= 418 MeV and m_π=312 MeV. In both cases, the $ρ$ decay is kinematically feasible. We work on lattice sizes N_z X 24^2 X 48 with lattice spacing a=0.1 fm and N_z=24,30,34,48.
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