A relativistic study of the nucleon helicity amplitudes |
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| Authors: | M De Sanctis E Santopinto MM Giannini |
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| Institution: | (1) INFN, Sezione di Roma, P.le A.Moro 2, I-00185 Roma, Italy, IT;(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), IT |
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| Abstract: | 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 Q
2≃ 2 (GeV/c)2. However, the low Q
2-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.
Received: 16 April 1998 |
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| Keywords: | PACS:12 39 Ki Relativistic quark model – 13 40 Gp Electromagnetic form factors – 14 20 Gk Baryon resonances with S=0 |
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