The A(q 2) deuteron structure function: the contribution of exchange currents associated with the ΔΔ component and the neutron charge form factor

Autor: B. Desplanques, N. Aissat, A. Amghar
Rok vydání: 1998
Předmět:
Zdroj: The European Physical Journal A. 1:85-90
ISSN: 1434-601X
1434-6001
DOI: 10.1007/s100500050035
Popis: In the present work, contributions to the deuteron electromagnetic structure due to exchange currents involving the ΔΔ 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 ΔΔ 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, G E n (q 2), which has been derived from the measurement of the structure function, A(q 2). An interesting observation is made about the derivation of this form factor. This calls for an extension of the accurate determination of A(q 2) to higher values of q 2.
Databáze: OpenAIRE
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