t-channel unitarity and photon cross sections

Abstract

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.

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

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Cited by in corpus (11)

• The hard pomeron in soft data
• Total photoproduction cross-section at very high energy
• Regge residues from DGLAP evolution
• Global QCD fit from $Q^2=0$ to $Q^2=30000$ GeV${}^2$ with Regge-compatible initial condition
• Soft data and the hard pomeron
• A review of the hard pomeron in soft diffraction
• Small-$Q^2$ extension of DGLAP-constrained Regge residues
• Consequences of t-channel unitarity for the interaction of real and virtual photons at high energies
• Log(1/x) Gluon Distribution and Structure Functions in the Loop-Loop Correlation Model
• The triple-pole pomeron: Regge theory and DGLAP evolution
• Consequences of t-channel unitarity for gamma(*)p and gamma(*) gamma(*) amplitudes