Minijets in gamma p and gamma gamma collisions

1994/06/28 by Manuel Drees, Drees, Manuel
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Cosmology and Gravitation Theories #FOS: Physical sciences #Gamma-ray bursts and supernovae #High Energy Physics - Phenomenology (hep-ph)

paper · pdf · doi:10.48550/arxiv.hep-ph/9406414

openalex publication_date 1994/06/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

I discuss the minijet contribution to total photoproduction and photon--photon cross sections. While minijets with p_T around 2 GeV have recently been observed directly in \gamgam experiments, the total \gamp cross section measured at HERA is in excellent agreement with predictions based on purely soft physics. Due to the large number of free parameters, predictions for the minijet contribution to total cross sections can be brought into agreement with these seemingly paradoxical observations. However, the currently used eikonalization procedure may not be applicable at all to a large part of the minijet contribution, making it very difficult to draw definite conclusions at present.

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