Multiple Reggeon Exchange from Summing QCD Feynman Diagrams

Details Multiple Reggeon Exchange from Summing QCD Feynman Diagrams Multiple Reggeon Exchange from Summing QCD Feynman Diagrams

1996-06-17

arxiv.org/abs/hep-ph/9606351v1

Phys.Rev. D55 (1997) 4016-4024

Physics

High Energy Physics

High Energy Physics - Phenomenology

uu-encoded latex file with 11 postscript figures (20 pages)

Scientific paper

10.1103/PhysRevD.55.4016

Multiple reggeon exchange supplies subleading logs that may be used to restore unitarity to the Low-Nussinov Pomeron, provided it can be proven that the sum of Feynman diagrams to all orders gives rise to such multiple regge exchanges. This question cannot be easily tackled in the usual way except for very low-order diagrams, on account of delicate cancellations present in the sum which necessitate individual Feynman diagrams to be computed to subleading orders. Moreover, it is not clear that sums of high-order Feynman diagrams with complicated criss-crossing of lines can lead to factorization implied by the multi-regge scenario. Both of these difficulties can be overcome by using the recently developed nonabelian cut diagrams. We are then able to show that the sum of $s$-channel-ladder diagrams to all orders does lead to such multiple reggeon exchanges.

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