Eur. Phys. J. C (2007) 49: 947-955
https://doi.org/10.1140/epjc/s10052-006-0180-8

Regular Article - Theoretical Physics

Electroproduction of two light vector mesons in next-to-leading BFKL: study of systematic effects

¹ Sobolev Institute of Mathematics, 630090, Novosibirsk, Russia
² Dipartimento di Fisica, Università della Calabria, Arcavacata di Rende, Cosenza, Italy
³ Gruppo collegato di Cosenza, Istituto Nazionale di Fisica Nucleare, 87036, Arcavacata di Rende, Cosenza, Italy

^* e-mail: papa@cs.infn.it

Received: 5 October 2006
Revised: 7 November 2006
Published online: 18 January 2007

Abstract

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 |t| with a different approach, based on collinear kernel improvement.