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Manuscript Title: Calculation of hadron elastic scattering amplitude from higher order Reggeon field theory.
Authors: M. Baig, C. Bourrely
Program title: REGGEON
Catalogue identifier: ACCG_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 32(1984)281
Programming language: Fortran.
Computer: CDC 750.
Operating system: CDC NOS/BE.
RAM: 31K words
Word size: 60
Keywords: Particle physics, Elementary, Reggeon field theory, Complex angular momentum, Sommerfeld watson Transform, High energy hadron Collisions, Empirical model.
Classification: 11.6.

Nature of problem:
The program performs the Sommerfeld Watson transform of the partial wave amplitude Tj(t) determined by the critical Reggeon field theory at the one or two loops approximation. From the amplitude determination, predictions are made for the differential cross section scaling law at collider energies.

Solution method:
The program computes the scattering amplitude Tab(s,t) by integrating the partial wave amplitude Tj(t) along a straight line ((c-i infinity), (c+i infinity)) in the complex angular momemtum j-plane, the amplitude Tj(t) being evaluated at the one or two loops level. The program provides a check for the presence of cuts in the complex j-plane.

The expression of Tj(t) at the order O(epsilon**2) requires the computation of two integrals. In order to reduce the computing time, a partial series development of the integrals is made.

Running time:
The test run to evaluate the imaginary part of Tabs(s,t) using the full O(epsilon**2) expansion took 110 Sec. on a CDC 750.