$Σ$ Like Term in Pion Electroproduction Near Threshold

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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 $L_0^+$ amplitude on this reaction.
16pages, latex, no figures, submitted to Nucl. Phys. A

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Nuclear Theory

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http://salesiana.dossiersoluciones.com/handle/123456789/198981

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/nucl-th/9702041
 http://arxiv.org/abs/nucl-th/9702041
 J.KoreanPhys.Soc.33:394-399,1998

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arXiv