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Titolo:
P-33(1232) resonance contribution to the amplitudes M-1+(3/2),E-1+(3/2),S-1+(3/2) from an analysis of the p(e,e ' p)pi(0) data at Q(2) = 2.8, 3.2, and 4 (GeV/c)(2) within the dispersion relation approach - art. no. 054009
Autore:
Aznauryan, IG; Stepanyan, SG;
Indirizzi:
Yerevan Phys Inst, Yerevan 375036, Armenia Yerevan Phys Inst Yerevan Armenia 375036 s Inst, Yerevan 375036, Armenia Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA ThomasJefferson Natl Accelerator Facil Newport News VA USA 23606 606 USA
Titolo Testata:
PHYSICAL REVIEW D
fascicolo: 5, volume: 5905, anno: 1999,
pagine: 4009 -
SICI:
0556-2821(19990301)5905:5<4009:PRCTTA>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
RELATIVIZED QUARK-MODEL; TRANSITION FORM-FACTORS; PION-PHOTOPRODUCTION; GAMMA-N<-->DELTA TRANSITION; DELTA(1232) REGION; DELTA-TRANSITION; MESON-EXCHANGE; NUCLEON; ELECTROPRODUCTION; QUADRUPOLE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
54
Recensione:
Indirizzi per estratti:
Indirizzo: Aznauryan, IG Yerevan Phys Inst, Alikhanian Bro St 2, Yerevan 375036, Armenia Yerevan Phys Inst Alikhanian Bro St 2 Yerevan Armenia 375036
Citazione:
I.G. Aznauryan e S.G. Stepanyan, "P-33(1232) resonance contribution to the amplitudes M-1+(3/2),E-1+(3/2),S-1+(3/2) from an analysis of the p(e,e ' p)pi(0) data at Q(2) = 2.8, 3.2, and 4 (GeV/c)(2) within the dispersion relation approach - art. no. 054009", PHYS REV D, 5905(5), 1999, pp. 4009

Abstract

Within the fixed-t dispersion relation approach we have analyzed the TJNAFand DESY data on the exclusive p(e,e'p)pi(0) reaction in order to find theP-33(1232) resonance contribution to the multipole amplitudes M-1+(3/2),E-1+(3/2),S-1+(3/2). As an input for the resonance and nonresonance contributions to these amplitudes the earlier obtained solutions of the integral equations which follow from dispersion relations are used. The obtained valuesof the ratio E2/M1 for the gamma*N-->P-33(1232) transition are 0.039 +/- 0.029,0.121 +/- 0.032, 0.04 +/- 0.031 for Q(2) = 2.8, 3.2, and 4 (GeV/c)(2),respectively. The comparison with the data at low Q(2) shows that there isno evidence for the presence of the visible perturbative QCD (PQCD) contribution into the transition gamma N-->P-33(1232) at Q(2) = 3-4 GeV2. The ratio (S1+M1+3/2)-M-3/2 for the resonance parts of multipoles is - 0.049 +/- 0.029, -0.099 +/- 0.041, - 0.085 +/- 0.021 for Q(2) = 2.8, 3.2, and 4 (GeV/c)(2), respectively. Our results for the transverse form factor G(T)(Q(2)) of the gamma*N-->P-33(1232) transition are lower than the values obtained from the inclusive data. With increasing Q(2), Q(4)G(T)(Q(2)) decreases, so there is no evidence for the presence of the PQCD contribution here too. [S0556-2821(99)03303-2].

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Documento generato il 06/07/20 alle ore 05:51:11