F. Paccanoni

A Deeply Virtual Compton Scattering Amplitude

Abstract A factorized Regge-pole model for deeply virtual Compton scattering is suggested. The use of an effective logarithmic Regge-pomeron trajectory provides for the description of both “soft” (small | t | ) and “hard” (large | t | ) dynamics. The model contains explicitly the photoproduction and the DIS limits and fits the existing HERA data on deeply virtual Compton scattering.

Fixed angle elastic hadron scattering

The scattering amplitude in the dual model with Mandelstam analyticity and trajectory

Analytical evolution of nucleon structure functions with power corrections at twist-4 and predictions for ultra-high energy neutrino-nucleon cross section

alpha (s)=alpha_{0}-gamma ln [ (1+beta sqrt{s_{0} -s})/(1+ beta sqrt{s_{0}})]

J/ψphotoproduction at DESY HERA

is studied in the limit

Ultrahigh-energy neutrino nucleon interactions

s,|t|to infty, s/t=const.

Q2 evolution of F2 (x, Q2) at small x from NMC to the HERA data

By using the saddle point method, a series decomposition for the scattering amplitude is obtained, with the leading and two sub-leading terms calculated explicitly.

Diffractive deep-inelastic scattering

In this paper we present an analytic result for the evolution in Q 2 of the structure functions for the neutrino-nucleon interaction, valid at twist-2 in the region of small values of the Bjorken x variable and for soft non-perturbative input. In the special case of flat initial conditions, we include in the calculation also the contribution of the twist-4 gluon recombination corrections, whose effect in the evolution is explicitly determined. Finally, we estimate the resulting charged-current neutrino-nucleon total cross section and discuss its behavior at ultrahigh energies.

Resonance masses and widths from nonlinear Regge trajectories

We revise and update an earlier model for

Triple Pomeron and proton diffraction dissociation

J/psi

Elastic diffraction and non-perturbative gluons

photoproduction based on a dipole Pomeron exchange. We show that the H1 and ZEUS experimental data reported recently can be well fitted by a soft Pomeron alone.