Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-10-04
Eur.Phys.J.C49:947-955,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages, 11 figures; journal version, new figures and discussion added
Scientific paper
10.1140/epjc/s10052-006-0180-8
The forward electroproduction of two light vector mesons is the first example of a collision process between strongly interacting colorless particles for which the amplitude can be written completely within perturbative QCD in the Regge limit with next-to-leading accuracy. In a previous paper we have given a numerical determination of the amplitude in the case of equal photon virtualities by using a definite representation for the amplitude and a definite optimization method for the perturbative series. Here we estimate the systematic uncertainty of our previous determination, by considering a different representation of the amplitude and different optimization methods of the perturbative series. Moreover, we compare our result for the differential cross section at the minimum momentum transfer with a different approach, based on collinear kernel improvement.
Ivanov Dmitri Yu.
Papa Alessandro
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