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arXiv 0906.4137hep-latnucl-exnucl-th
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从格点量子色动力学研究重子结构

Baryon structure from Lattice QCD

C. Alexandrou

摘要:

本文介绍了重子谱、核子电磁和轴向形状因子、核子到$Δ$跃迁的形状因子以及$Δ$电磁形状因子的晶格结果。用两种简并的扭曲质量费米子的味道计算了低位重子的质量和核子的形状因子,最低质量为270 MeV。我们将其与其他合作的结果进行比较。用交错海夸克和畴壁价夸克的混合方案计算了核子到$Δ$的跃迁和$Δ$的形状因子。利用动力学畴壁费米子计算了主导偶极核子到$Δ$跃迁的形状因子。利用由格点量子色动力学确定的形状因子,提取了无限动量系中$Δ$的横向密度分布。

英文摘要:

We present recent lattice results on the baryon spectrum, nucleon electromagnetic and axial form factors, nucleon to $Δ$ transition form factors as well as the $Δ$ electromagnetic form factors. The masses of the low lying baryons and the nucleon form factors are calculated using two degenerate flavors of twisted mass fermions down to pion mass of about 270 MeV. We compare to the results of other collaborations. The nucleon to $Δ$ transition and $Δ$ form factors are calculated in a hybrid scheme, which uses staggered sea quarks and domain wall valence quarks. The dominant dipole nucleon to $Δ$ transition form factor is also evaluated using dynamical domain wall fermions. The transverse density distributions of the $Δ$ in the infinite momentum frame are extracted using the form factors determined from lattice QCD.

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