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Titolo:
Dynamical study of the Delta excitation in N(e,e 'pi) reactions - art. no.055201
Autore:
Sato, T; Lee, TSH;
Indirizzi:
Osaka Univ, Dept Phys, Osaka 5600043, Japan Osaka Univ Osaka Japan 5600043 aka Univ, Dept Phys, Osaka 5600043, Japan Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA Argonne Natl Lab Argonne IL USA 60439 ab, Div Phys, Argonne, IL 60439 USA
Titolo Testata:
PHYSICAL REVIEW C
fascicolo: 5, volume: 6305, anno: 2001,
pagine: 5201 -
SICI:
0556-2813(200105)6305:5<5201:DSOTDE>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
RELATIVIZED QUARK-MODEL; MESON-EXCHANGE MODEL; PION-PHOTOPRODUCTION; GAUGE-INVARIANT; FORM-FACTORS; DELTA(1232) RESONANCE; BARYON RESONANCES; ELECTROPRODUCTION; NUCLEON; AMPLITUDES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
63
Recensione:
Indirizzi per estratti:
Indirizzo: Sato, T Osaka Univ, Dept Phys, Osaka 5600043, Japan Osaka Univ Osaka Japan 5600043 , Dept Phys, Osaka 5600043, Japan
Citazione:
T. Sato e T.S.H. Lee, "Dynamical study of the Delta excitation in N(e,e 'pi) reactions - art. no.055201", PHYS REV C, 6305(5), 2001, pp. 5201

Abstract

The dynamical model developed by us [Phys. Rev. C 54, 2660 (1996)] has been applied to investigate the pion electroproduction reactions on the nucleon. It is found that the model can describe to a very large extent the recent data of p(e,e' pi (0)). reaction from Jefferson Laboratory and MIT-Bates. The extracted magnetic dipole (MI), electric dipole (E2), and Coulomb (C2)strengths of the gammaN-->Delta transition are presented. It is found thatthe C2/M1 ratio drops significantly with Q(2) and reaches about - 14% at Q(2) = 4 (GeV/c)(2), while the E2/M1 ratio remains close to the value similar to -3% at the Q(2) = 0 photon point. The determined M1 transition form factor drops faster than the usual dipole form factor of the proton. We also find that the nonresonant interactions can dress the gammaN --> Delta vertex to enhance strongly its strength at low Q(2), but much less at high Q(2) Predictions are presented for future experimental tests. Possible developments of the model are discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 13:54:37