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MAN/HEP/2007/21 Hadronic photon-photon scattering at LEP 1

By Thorsten Wengler

Abstract

Abstract. Hadronic interactions of two quasi-real photons have been studied extensively both during the LEP1 and the LEP2 data taking periods. The higher energies available at LEP2 in particular opened regions of phase space where hadronic processes can be predicted reliably by perturbative QCD calculations, usually available to next-to-leading order in the strong coupling constant for the process concerned. Over a wide range of observables and phase space good agreement is observed between measurements and theory, however, there are a few exceptions. The L3 collaboration has found large discrepancies for high momentum particle and jet production between theory and experiment, and measurements of open b-quark production by DELPHI, L3, and OPAL are consistently in excess of the theoretical values. Three new measurements have now become available and will be discussed in this paper: on jet and hadron production by OPAL and open beauty production by ALEPH. 1. Cross section for open b-quark production Until recently the only measurement of open b-quark production in two-photon collisions had been published by the L3 collaboration [1]. In this paper the cross section was measured to be about three times the prediction of NLO QCD. Similar results have been reported by DELPHI [2

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