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Titolo:
Mesonic cloud contribution to the nucleon and Delta masses - art. no. 035201
Autore:
Ernst, DJ;
Indirizzi:
Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA Vanderbilt Univ Nashville TN USA 37235 & Astron, Nashville, TN 37235 USA Jefferson Lab, Newport News, VA 23606 USA Jefferson Lab Newport News VA USA 23606 n Lab, Newport News, VA 23606 USA
Titolo Testata:
PHYSICAL REVIEW C
fascicolo: 3, volume: 6403, anno: 2001,
pagine: 5201 -
SICI:
0556-2813(200109)6403:3<5201:MCCTTN>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
RELATIVIZED QUARK-MODEL; PI-N SCATTERING; CHEW-LOW THEORY; ELASTIC-SCATTERING; BARYON RESONANCES; SEPARABLE POTENTIALS; NONSTRANGE BARYONS; FORM-FACTOR; BAG MODEL; DECAYS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
68
Recensione:
Indirizzi per estratti:
Indirizzo: Ernst, DJ Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA Vanderbilt Univ Nashville TN USA 37235 Nashville, TN 37235 USA
Citazione:
D.J. Ernst, "Mesonic cloud contribution to the nucleon and Delta masses - art. no. 035201", PHYS REV C, 6403(3), 2001, pp. 5201

Abstract

Pion-nucleon elastic scattering in the dominant P-33 channel is examined in the model in which the interaction is of the form pi +N<->N, Delta (1232). New expressions are found for the elastic pion-nucleon scattering amplitude which differ from existing formula both in the kinematics and in the treatment of the renormalization of the nucleon mass and coupling constant. Fitting the model to the phase shifts in the P-33 channel does not uniquely fix the parameters of the model. The cutoff for the pion-nucleon form factoris found to lie in the range beta = 750+/-350 MeV/c. The masses of the nucleon and the Delta which would arise if there were no coupling to mesons are found to be m(N)((0)) = 1200+/-200 MeV and m(Delta)((0)) =1500+/-200 MeV. The difference in these bare masses, a quantity which would be accounted for by a residual gluon interaction, is found to be deltam((0)) = 350 +/-100MeV.

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Documento generato il 03/07/20 alle ore 22:22:07