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arXiv 1002.3550hep-lat
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具有畴壁费米子2+1味的核子电磁形状因子

Nucleon electromagnetic form factors with 2+1 flavors of domain wall fermions

M. F. Lin, J. D. Bratt, M. Engelhardt, Ph. Hagler, T. R. Hemmert, H. B. Meyer, J. W. Negele, A. V. Pochinsky, M. Procura, W. Schroers, S. Syritsyn

摘要:

我们提出了最近的高统计计算的核子电磁形状因子与完全动力学域壁费米子的32^3x64晶格的RBC和UKQCD合作产生的,介子质量约为297 MeV,355 MeV和403 MeV。我们研究了形状因子对动量转移依赖性的唯象拟合,并利用手征有效场论的两种变体,即小尺度展开和协变重子手征微扰理论,研究了Dirac半径、Pauli半径和反常磁矩的手征外推.

英文摘要:

We present the recent high-statistics calculations of the nucleon electromagnetic form factors with fully dynamical domain wall fermions on the 32^3x64 lattices generated by the RBC and UKQCD collaborations, with pion masses at roughly 297 MeV, 355 MeV and 403 MeV. We study the phenomenological fits to the momentum transfer dependence of the form factors and investigate chiral extrapolations for the Dirac radius, Pauli radius and the anomalous magnetic moment using two variants of chiral effective field theories, the small scale expansion (SSE) and covariant baryon chiral perturbation theory.

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