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arXiv 1102.2208hep-lathep-phnucl-exnucl-th
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扭曲质量格点量子色动力学中核子电磁形状因子

Nucleon electromagnetic form factors in twisted mass lattice QCD

C. Alexandrou, M. Brinet, J. Carbonell, M. Constantinou, P. A. Harraud, P. Guichon, K. Jansen, T. Korzec, M. Papinutto

摘要:

本文利用两种不同的简并扭曲质量费米子,给出了格点量子色动力学中核子电磁形状因子的计算结果。使用模拟在两个体积的空间长度L=2.1 fm和L=2.8 fm的体积效应进行检查。使用三种不同的晶格间距值,即a=0.089 fm,a=0.070和a=0.056 fm的截止效应进行了研究。核子磁矩,狄拉克和泡利半径得到的连续极限和手征外推到物理介子质量允许与实验进行比较。

英文摘要:

We present results on the nucleon electromagnetic form factors within lattice QCD using two flavors of degenerate twisted mass fermions. Volume effects are examined using simulations at two volumes of spatial length L=2.1 fm and L=2.8 fm. Cut-off effects are investigated using three different values of the lattice spacings, namely a=0.089 fm, a=0.070 and a=0.056 fm. The nucleon magnetic moment, Dirac and Pauli radii are obtained in the continuum limit and chirally extrapolated to the physical pion mass allowing for a comparison with experiment.

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