Aspects of the unitarized soft multipomeron approach in DIS and diffraction

M.B. Gay Ducati; E.G. Ferreiro; M.V.T. Machado; C.A. Salgado

doi:10.1007/s100520200911

EPJ

Aspects of the unitarized soft multipomeron approach in DIS and diffraction

M.B. Gay Ducati¹, E.G. Ferreiro², M.V.T. Machado¹ and C.A. Salgado³

¹ Instituto de Fìsica, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, CEP 91501-970, Porto Alegre, RS, Brazil
² Depto. de Fìsica de Partìculas, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
³ CERN, 1211 Geneva 23, Switzerland

Received: 22 October 2001
Revised: 11 January 2002
Published online: 5 April 2002

Abstract

We study in detail the main features of the unitarized Regge model (CFKS), recently proposed to describe the small-Q² domain. It takes into account a two-component description with two types of unitarized contributions: one is the multiple pomeron exchange contribution, interacting with the large dipole size configurations, and the other one consists of a unitarized dipole cross section, describing the interaction with the small size dipoles. We analyze the ratio between soft and hard pieces as a function of the virtuality, and also compare the resulting dipole cross section to that from the saturation model. Diffraction dissociation is also considered, showing the scaling violations in diffractive DIS and estimating the corresponding logarithmic slope.