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Elsevier, Physics Letters B, 1-2(519), p. 33-45, 2001

DOI: 10.1016/s0370-2693(01)01072-3

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Total cross section in γγ collisions at LEP

Journal article published in 2001 by M. Acciarri, P. Achard, O. Adriani, M. Aguilar Benitez, J. Alcaraz, G. Alemanni, J. Allaby, A. Aloisio, M. G. Alviggi, G. Ambrosi, H. Anderhub, V. P. Andreev, T. Angelescu, F. Anselmo, A. Arefiev and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The reaction for quasi-real photons is studied using data from GeV up to 202 GeV. Results on the total cross sections ) and σ(γγ→hadrons) are given for the two-photon centre-of-mass energies 5 GeV⩽Wγγ⩽185 GeV. The total cross section of two real photons is described by a Regge parametrisation. We observe a steeper rise with the two-photon centre-of-mass energy as compared to the hadron–hadron and the photon–proton cross sections. The data are also compared to the expectations of different theoretical models.