On factorization, quark counting and vector dominance
Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208, USA
2 Department of Physics, University of Wisconsin, Madison, WI 53706, USA
3 INFN-Laboratori Nazionali di Frascati, 00044 Frascati, Italy
Revised: 29 November 2001
Published online: 8 February 2002
Using an eikonal structure for the scattering amplitude, Block and Kaidalov  have derived factorization theorems for nucleon-nucleon, γp and γγ scattering at high energies, using only some very general assumptions. We present here an analysis giving experimental confirmation for factorization of cross sections, nuclear slope parameters B and ρ-values (ratio of real to imaginary portion of forward scattering amplitudes), showing that: – the three factorization theorems  hold, – the additive quark model holds to ≈1%, – and vector dominance holds to better than ≈4%.
© Società Italiana di Fisica, Springer-Verlag, 2002