The A(q2) deuteron structure function: the contribution of
exchange currents associated with the 
component and the neutron
charge form factor
A. Amghar1 - N. Aissat2 - B. Desplanques3
1 Département des Sciences Fondamentales, INHC, 35000 Boumerdes,
Algeria
2 Institut de Physique, USTHB, BP32, Bab Ezzouar 16111(Alger), Algeria
3 Institut des Sciences Nucléaires (UMR CNRS-IN2P3,UJF) F-38026 Grenoble
Cedex, France (e-mail: desplanq@isn.in2p3.fr)
Received: 24 July 1997 / Revised version: 16 September 1997
Abstract
In the present work, contributions to the deuteron electromagnetic
structure due to exchange currents involving the component are
studied. For a 0.88% probability of this component, it is found that a
substantially important contribution to the deuteron charge form factor is
obtained. It comes just second in order of importance after that of the
pion-pair current. This contribution has its origin in the
usual pair current, but at the quark level. Taking into account this new
contribution implies a modification of the neutron charge form factor,
GEn(q2), which has been derived from the measurement of the structure
function, A(q2). An interesting observation is made about the derivation
of this form factor. This calls for an extension of the accurate determination
of A(q2) to higher values of q2.
PACS
13.40.Fn Deuteron charge form factor -
13.75.Cs Neutron charge form factor; Isobar contribution -
25.45.De Meson exchange currents
Copyright Springer-Verlag
