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Titolo:
THE POSITION AND THE RESIDUES OF THE DELTA-RESONANCE POLE IN PION-PHOTOPRODUCTION
Autore:
HANSTEIN O; DRECHSEL D; TIATOR L;
Indirizzi:
UNIV MAINZ,INST KERNPHYS D-55099 MAINZ GERMANY
Titolo Testata:
Physics letters. Section B
fascicolo: 1-4, volume: 385, anno: 1996,
pagine: 45 - 51
SICI:
0370-2693(1996)385:1-4<45:TPATRO>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
RELATIVIZED QUARK-MODEL; CHIRAL BAG MODELS; DELTA(1232) REGION; TRANSITION; QUADRUPOLE; NUCLEON; RATIO; GAMMA-N->DELTA(1232); AMPLITUDE; N->DELTA;
Keywords:
PION PHOTOPRODUCTION; ELECTROMAGNETIC PROPERTIES OF THE DELTA RESONANCE; SPEED PLOT; DISPERSION RELATIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
47
Recensione:
Indirizzi per estratti:
Citazione:
O. Hanstein et al., "THE POSITION AND THE RESIDUES OF THE DELTA-RESONANCE POLE IN PION-PHOTOPRODUCTION", Physics letters. Section B, 385(1-4), 1996, pp. 45-51

Abstract

We have analyzed the M(1+)((3/2)) and E(1+)((3/2)) multipole amplitudes of pion photoproduction in the framework of fixed-t dispersion relations. Applying the speed plot technique to our results for these multipoles, we have determined the position and the residues of the Delta (1232) resonance pole. The pole is found at total c.m. energy W = (1211 - 50i) MeV on the second Riemann sheet, and the ratio of the electric and magnetic residues is R(Delta) = -0.035 - 0.046i, resulting in anE2/M1 ratio for the ''dressed'' delta resonance of -3.5%.

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Documento generato il 13/07/20 alle ore 04:11:18