$\Sigma$ Like Term in Pion Electroproduction Near Threshold
Abstract
Sum of the time component of $\Sigma$ 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 $\Sigma$ term represents the charged pseudo scalar quark density matrix elements in nucleon and manifests itself in the $L_0^+$ amplitude on this reaction.
- Publication:
-
arXiv e-prints
- Pub Date:
- February 1997
- DOI:
- 10.48550/arXiv.nucl-th/9702041
- arXiv:
- arXiv:nucl-th/9702041
- Bibcode:
- 1997nucl.th...2041C
- Keywords:
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- Nuclear Theory
- E-Print:
- 16pages, latex, no figures, submitted to Nucl. Phys. A