Springer LINK: The European Physical Journal A - Abstract Volume 2 Issue 4 (1998) pp 403-409

The European Physical Journal A

ISSN: 1434-6001 (printed version)
ISSN: 1434-601X (electronic version)

Table of Contents

Abstract Volume 2 Issue 4 (1998) pp 403-409

hadron physics: A relativistic study of the nucleon helicity amplitudes

M. De Sanctis (1), E. Santopinto (2), M.M. Giannini (2)

(1) INFN, Sezione di Roma, P.le A.Moro 2, I-00185 Roma, Italy
(2) Dipartimento di Fisica dell'Università di Genova, I.N.F.N., Sezione di Genova, via Dodecaneso 33, 16164 Genova, Italy (e-mail:giannini@genova.infn.it)

Received: 16 April 1998

Abstact: We perform a calculation of the relativistic transition form factors for the electromagnetic excitation of the nucleon resonances. We use as input the 3-quark wave functions obtained in a Constituent Quark Model with three-body forces in the hypercentral approach. With respect to the non relativistic calculations a significant contribution is obtained up to Q² \simeq 2 (GeV/c)². However, the low Q²-behaviour exhibits a lack of strength, which may be connected with the need of taking into account explicitly further degrees of freedom beyond the three constituent quark ones.

PACS: 12.39.Ki Relativistic quark model - 13.40.Gp Electromagnetic form factors - 14.20.Gk Baryon resonances with S=0

Communicated by V.V. Anisovich

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