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Titolo:
PION-NUCLEON SCATTERING IN A NEW APPROACH TO CHIRAL PERTURBATION-THEORY
Autore:
ELLIS PJ; TANG HB;
Indirizzi:
UNIV MINNESOTA,SCH PHYS & ASTRON MINNEAPOLIS MN 55455
Titolo Testata:
Physical review. C. Nuclear physics
fascicolo: 6, volume: 57, anno: 1998,
pagine: 3356 - 3375
SICI:
0556-2813(1998)57:6<3356:PSIANA>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARTIAL-WAVE ANALYSIS; SIGMA-TERM; ONE LOOP; LAGRANGIANS; MODEL; FIELD; FORCES; QUARK;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
54
Recensione:
Indirizzi per estratti:
Citazione:
P.J. Ellis e H.B. Tang, "PION-NUCLEON SCATTERING IN A NEW APPROACH TO CHIRAL PERTURBATION-THEORY", Physical review. C. Nuclear physics, 57(6), 1998, pp. 3356-3375

Abstract

We study pion-nucleon scattering with a chiral Lagrangian of pions, nucleons, and Delta isobars. The scattering amplitude is evaluated to one-loop Q(3) order, where Q is a generic small momentum, using an approach which is equivalent tb heavy baryon chiral perturbation theory. We obtain a good fit to the experimental phase shifts for pion center-of-mass kinetic energies up to 100 MeV. A sigma term greater than 45 MeV is favored, but the value is not well determined.

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Documento generato il 26/11/20 alle ore 14:26:23