The donnachie-landshoff pomeron and gauge invariance
DAPNIA/SPhN, CEA/Saclay, F-91191, Gif sur Yvette CEDEX, France
Published online: 17 September 2013
The pomeron model of Donnachie and Landshoff does not conserve the electromagnetic current when applied to diffractive reactions such as electroproduction of a quark-antiquark pair or of a vector meson. We propose a treatment of this problem which ensures a physical behaviour of cross sections in the photoproduction limit and show that it leads to results rather similar to those obtained from two-gluon exchange.
© Springer-Verlag, 1999