Σ Like Term in Pion Electroproduction Near Threshold
Myung Ki Cheoun, Shin Nan Yang, Bong Soo Han, Il-Tong Cheon
Abstract
Sum of the time component of Σ term and the induced pseudo scalar term in axial current is shown to be the t-channel pion pole in Born terms for pion electroproduction near threshold. We also show that this Σ term represents the charged pseudo scalar quark density matrix elements in nucleon and manifests itself in the L0+ amplitude on this reaction.
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