The European Physical Journal C

ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)

Table of Contents

Abstract Volume 2 Issue 4 (1998) pp 683-689
DOI 10.1007/s100529800733

theoretical physics:
Total $\gamma^{\star}\gamma^{\star}$ cross section and the QCD dipole picture

A. Bialas (1), W. Czyz (1)(2), W. Florkowski (2)

(1) M. Smoluchowski Institute of Physics, Jagellonian University, ul. Reymonta 4, PL-30-059 Kraków, Poland
(2) H. Niewodniczanski Institute of Nuclear Physics, ul. Radzikowskiego 152, PL-31-342 Kraków, Poland

Received: 12 June 1997 / Published online: 20 February 1998

Abstract. In the framework of the dipole picture of the BFKL pomeron we discuss two possibilities of calculating the total $\gamma^{\star}\gamma^{\star}$ cross section of the virtual photons. It is shown that the dipole model reproduces the results obtained earlier from $k_T$-factorization up to the selection of the scale determining the length of the QCD cascade. The choice of scale turns out to be important for the numerical outcome of the calculations.

This work was supported in part by the KBN Grant No. 2P03B 083 08 (A.B. and W.C.), by the KBN Grant No. 2P03B 080 12 (W.F.), by the Stiftung für Deutsch-Polnische Zusammenarbeit project 1522/94/LN (W.F.), and by PECO grant from the EEC Programme "Human Capital Mobility", Network "Physics at High Energy Colliders" (Contract No. ERBICIPDCT 940613)

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Online publication: May 25, 1998
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