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arXiv 0810.3976hep-lat
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格点量子色动力学中的δ重子电磁形状因子

Delta-baryon electromagnetic form factors in lattice QCD

C. Alexandrou, T. Korzec, G. Koutsou, Th. Leontiou, C. Lorcé, J. W. Negele, V. Pascalutsa, A. Tsapalis, M. Vanderhaeghen

摘要:

我们开发的技术来计算四个三角洲电磁形状因子使用格点量子色动力学,特别强调次主导的电四极形状因子,探针变形的三角洲。结果π质量下降到约350兆电子伏的三种情况下:淬火QCD,两种口味的动态威尔逊夸克,和三种口味的夸克描述的混合行动结合域壁价夸克和动态交错海夸克。对Delta的磁矩进行了手征外推,讨论了Delta的电荷密度分布。

英文摘要:

We develop techniques to calculate the four Delta electromagnetic form factors using lattice QCD, with particular emphasis on the sub-dominant electric quadrupole form factor that probes deformation of the Delta. Results are presented for pion masses down to approximately 350 MeV for three cases: quenched QCD, two flavors of dynamical Wilson quarks, and three flavors of quarks described by a mixed action combining domain wall valence quarks and dynamical staggered sea quarks. The magnetic moment of the Delta is chirally extrapolated to the physical point and the Delta charge density distributions are discussed.

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