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- E. R. Berger
- 2001

We investigate the exclusive photoproduction of a heavy timelike photon which decays into a lepton pair, γp → ℓ + ℓ − p. This can be seen as the analog of deeply virtual Compton scattering, and we argue that the two processes are complementary for studying generalized parton distributions in the nucleon. In an unpolarized experiment the angular distribution… (More)

- E. R. Berger
- 1998

Total and differential cross sections for high energy and small momentum transfer elastic hadron-hadron scattering are studied in QCD using a functional integral approach. The hadronic amplitudes are governed by vacuum expectation values of lightlike Wegner-Wilson loops, for which a matrix cumulant expansion is derived. The cumulants are evaluated within… (More)

- E. R. Berger, A. Donnachie, H. G. Dosch, O. Nachtmann
- 2000

We calculate high-energy photoproduction of the tensor meson f 2 (1270) by odd-eron and photon exchange in the reaction γ + p → f 2 (1270) + X, where X is either the nucleon or the sum of the N(1520) and N(1535) baryon resonances. Odderon exchange dominates except at very small transverse momentum, and we find a cross section of about 20 nb at a… (More)

- E. R. Berger, A. Donnachie, H. G. Dosch, W. Kilian, O. Nachtmann, M. Rueter
- 1999

We investigate the reaction e p → e PS X where PS denotes a pseudoscalar meson π 0 , η, η ′ , or η c and X either a proton or resonance or continuum states into which the proton can go by diffractive excitation. At high energies photon and odderon exchange contribute to the reaction. The photon exchange contribution is evaluated exactly using data for the… (More)

- E. R. Berger
- 1998

This report discusses some results on differential cross sections for high energy and small momentum transfer elastic hadron-hadron scattering in QCD, using a functional integral approach. In particulary a matrix cumu-lant expansion for the vacuum expectation values of lightlike Wegner-Wilson loops, which governs the hadronic amplitudes, is presented. The… (More)

- E R Berger, A Donnachie, H G Dosch, W Kilian, O Nachtmann, M Rueter
- 2007

We investigate the reaction e p ! e PS X where PS denotes a pseudoscalar meson 0 , , 0 , or c and X either a proton or resonance or continuum states into which the proton can go by diiractive excitation. At high energies photon and odderon exchange contribute to the reaction. The photon exchange contribution is evaluated exactly using data for the total… (More)

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