Cross-ladder effects in Bethe-Salpeter and light-front equations

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.

03.65.Pm
03.65.Ge
11.10.St
Bethe-Salpeter equation: solution
light front
ladder approximation
binding energy
numerical calculations

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Figures(0)

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