Isovector meson-exchange currents in the light-front dynamics

In the light-front dynamics, there is no pair term that plays the role of the dominant isovector pion exchange current. This current gives rise to the large and experimentally observed contribution to the deuteron electrodisintegration cross-section near threshold for pseudo-scalar πNN coupling. We...

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Bibliographic Details
Published in:Nuclear physics. A 1995-07, Vol.589 (4), p.697-712
Main Authors: Desplanques, B., Karmanov, V.A., Mathiot, J.-F.
Format: Article
Language:English
Subjects:
Nuclear Theory
Physics
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Summary:In the light-front dynamics, there is no pair term that plays the role of the dominant isovector pion exchange current. This current gives rise to the large and experimentally observed contribution to the deuteron electrodisintegration cross-section near threshold for pseudo-scalar πNN coupling. We show analytically that in leading 1 m order the amplitude in the light-front dynamics coincides, however, with the one given by the pair term. At high Q 2, it consists of two equal parts. One comes from extra components of the deuteron and final state relativistic wave functions. The other results from the contact NNπγ interaction which appears in the light-front dynamics. This provides a transparent link between relativistic and non-relativistic approaches.
ISSN:0375-9474
1873-1554
DOI:10.1016/0375-9474(95)00088-I