Cross-ladder effects in Bethe-Salpeter and Light-Front equations

Details Cross-ladder effects in Bethe-Salpeter and Light-Front equations Cross-ladder effects in Bethe-Salpeter and Light-Front equations

2005-05-30

arxiv.org/abs/hep-th/0505262v2

Eur. Phys. J. A 27 (1), 11 (2006)

Physics

High Energy Physics

High Energy Physics - Theory

11 pages, 7 figures

Scientific paper

10.1140/epja/i2005-10194-y

Bethe-Salpeter (BS) equation in Minkowski space for scalar particles is solved for a kernel given by a sum of ladder and cross-ladder exchanges. The solution of corresponding Light-Front (LF) equation, where we add the time-ordered stretched boxes, is also obtained. Cross-ladder contributions are found to be very large and attractive, whereas the influence of stretched boxes is negligible. Both approaches -- BS and LF -- give very close results.

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