Eur. Phys. J. C (2008) 58: 1-7
https://doi.org/10.1140/epjc/s10052-008-0732-1

Regular Article - Theoretical Physics

BFKL resummation effects in the γ ^* γ ^* total hadronic cross section

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

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

Received: 23 July 2008
Published online: 1 October 2008

Abstract

We study in the BFKL approach the total hadronic cross section for the collision of two virtual photons for energies in the range of LEP2 and in the range of future linear colliders. The BFKL resummation is done at the next-to-leading order in the BFKL Green’s function; photon impact factors are taken instead at the leading order, but with the inclusion of the subleading terms required by invariance under changes of the renormalization scale and of the BFKL scale s ₀. We compare our results with previous estimates based on a similar kind of approximation.