DOI 10.1007/s100529800963
Multiplicity structure of the hadronic final state
in diffractive deep-inelastic scattering at HERA
H1 Collaboration
C.Adloff34 - et al.
34 Fachbereich Physik, Bergische Universität Gesamthochschule Wuppertal, Wuppertal, Germany
Received: 27 April 1998 / Published online: 3 September 1998
Abstract
The multiplicity structure of the hadronic system X
produced in deep-inelastic processes at HERA of the type 
, where Y is a hadronic system with mass
MY< 1.6 GeV and where the squared momentum transfer at the pY
vertex, t, is limited to 
, is studied
as a
function of the invariant mass MX of the system X.
Results are presented on multiplicity
distributions and multiplicity moments, rapidity spectra
and forward-backward correlations in the centre-of-mass system of X.
The data are compared to results in e+e- annihilation,
fixed-target lepton-nucleon collisions, hadro-produced diffractive
final states and to non-diffractive hadron-hadron collisions.
The comparison suggests a production mechanism of
virtual photon dissociation which involves a mixture of
partonic states and a significant gluon content.
The data are well described by a model, based on a QCD-Regge analysis
of the diffractive structure function, which assumes a
large hard gluonic component of the colourless exchange at low Q2.
A model with soft colour interactions is also successful.
Copyright Springer-Verlag
