Electroproduction of the Roper resonance and the constituent quark model

Cardarelli, F.; Pace, E.; Salme, G.; Simula, S.

doi:10.1016/S0370-2693(97)00149-4

Electroproduction of the Roper resonance and the constituent quark model

F. Cardarelli
(
- Florida State U., SCRI
)
,
E. Pace
(
- Rome U., Tor Vergata and
- INFN, Rome
)
,
G. Salme
(
- Rome, ISS
)
,
S. Simula
(
- Rome, ISS
)

Sep, 1996

14 pages

Published in:

Phys.Lett.B 397 (1997) 13-19

e-Print:

nucl-th/9609047 [nucl-th]

DOI:

10.1016/S0370-2693(97)00149-4

Report number:

INFN-ISS-96-8

View in:

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Abstract:

A parameter-free evaluation of the

N - P_{11}(1440)

electromagnetic transition form factors is performed within a light-front constituent quark model, using for the first time the eigenfunctions of a mass operator which generates a large amount of configuration mixing in baryon wave functions. A one-body electromagnetic current, which includes the phenomenological constituent quark form factors already determined from an analysis of pion and nucleon experimental data, is adopted. For

Q~2

up to few

(GeV/c)~2

, at variance with the enhancement found in the elastic channel, the effect of configuration mixing results in a significant suppression of the calculated helicity amplitudes with respect to both relativistic and non-relativistic calculations, based on a simple gaussian-like ansatz for the baryon wave functions.

13.60.Rj
13.40.Gp
12.39.Ki
12.39.Pn
Baryon resonances
Electromagnetic form factors
Relativistic quark models
electron nucleon: exclusive reaction
N(1440): electroproduction
form factor: transition

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