t-channel unitarity and photon cross sections

Details t-channel unitarity and photon cross sections t-channel unitarity and photon cross sections

2002-07-16

arxiv.org/abs/hep-ph/0207196v2

Nucl.Phys. B682 (2004) 391-420

Physics

High Energy Physics

High Energy Physics - Phenomenology

36 pages, LaTeX, 15 eps figures, needs elsart.cls (included). The theoretical part has been reworked. The conclusions and appl

Scientific paper

10.1016/j.nuclphysb.2004.01.005

We analyse the consequences of t-channel unitarity for the photon hadronic cross sections. We show that gamma(*)p and gamma(*) gamma(*) elastic amplitudes must include the complex-j plane singularities associated with hadronic elastic amplitudes, and give the characteristics of possible new singularities. We also show that several different models of hadronic total cross sections can be used to predict the LEP data from the HERA measurements.

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