2020 Impact factor 3.043
Hadrons and Nuclei
Eur. Phys. J. A 1, 85-90

The A(q2) deuteron structure function: the contribution of exchange currents associated with the $\Delta\Delta$ 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 $\Delta\Delta$ 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 $\Delta\Delta$ 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


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