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Article overview
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Preserving Local Gauge Invariance with t-Channel Regge Exchange | Helmut Haberzettl
; Xiao-Yun Wang
; Jun He
; | Date: |
4 Sep 2015 | Abstract: | Considering single-meson photo- and electroproduction off a baryon, it is
shown how to restore local gauge invariance that was broken by replacing
standard Feynman-type meson exchange in the t-channel by exchange of a Regge
trajectory. This is achieved by constructing a contact current whose
four-divergence cancels the gauge-invariance-violating contributions resulting
from all states above the base state on the Regge trajectory. To illustrate the
procedure, modifications necessary for the process $gamma +p o K^+ +
Sigma^{*0}$ are discussed in some detail. We also provide the general
expression for the contact current for an arbitrary reaction. | Source: | arXiv, 1509.1536 | Services: | Forum | Review | PDF | Favorites |
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