Cross-ladder effects in Bethe-Salpeter and Light-Front equations
نویسنده
چکیده
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. PACS. PACS-key 03.65.Pm – PACS-key 03.65.Ge – PACS-key 11.10.St
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