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Title: Strange form factors of octet and decuplet baryons

Abstract

The strange form factors of baryon octet are evaluated, in the chiral models with the general chiral SU(3) group structure, to yield the theoretical predictions comparable to the recent experimental data of SAMPLE Collaboration and to study the spin symmetries. Other model predictions are also briefly reviewed to compare with our results and then the strange form factors of baryon octet and decuplet are predicted.

Authors:
 [1]
  1. Department of Physics and Basic Science Research Institute, Sogang University, C.P.O. Box 1142, Seoul 100-611 (Korea, Republic of)
Publication Date:
OSTI Identifier:
21210321
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 494; Journal Issue: 1; Conference: Conference on new directions in quantum chromodynamics, Seoul (Korea, Republic of); Kyungju (Korea, Republic of), 26 May - 18 Jun 1999; Other Information: DOI: 10.1063/1.1301691; (c) 1999 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BARYON DECUPLETS; BARYON OCTETS; BARYONS; CHIRAL SYMMETRY; CHIRALITY; COMPARATIVE EVALUATIONS; FORM FACTORS; SPIN; STRANGE PARTICLES; SU-3 GROUPS

Citation Formats

Hong, Soon-Tae. Strange form factors of octet and decuplet baryons. United States: N. p., 1999. Web. doi:10.1063/1.1301691.
Hong, Soon-Tae. Strange form factors of octet and decuplet baryons. United States. doi:10.1063/1.1301691.
Hong, Soon-Tae. 1999. "Strange form factors of octet and decuplet baryons". United States. doi:10.1063/1.1301691.
@article{osti_21210321,
title = {Strange form factors of octet and decuplet baryons},
author = {Hong, Soon-Tae},
abstractNote = {The strange form factors of baryon octet are evaluated, in the chiral models with the general chiral SU(3) group structure, to yield the theoretical predictions comparable to the recent experimental data of SAMPLE Collaboration and to study the spin symmetries. Other model predictions are also briefly reviewed to compare with our results and then the strange form factors of baryon octet and decuplet are predicted.},
doi = {10.1063/1.1301691},
journal = {AIP Conference Proceedings},
number = 1,
volume = 494,
place = {United States},
year = 1999,
month =
}
  • The electromagnetic form factors of the SU(3) octet baryons are investigated in the semibosonized SU(3) Nambu{endash}Jona-Lasinio model (chiral quark-soliton model). The rotational 1/{ital N}{sub {ital c}} and strange quark mass corrections in linear order are taken into account. The electromagnetic charge radii of the nucleon and magnetic moments are also evaluated. It turns out that the model is in remarkably good agreement with the experimental data. {copyright} {ital 1996 The American Physical Society.}
  • The general parametrization method (Phys. Rev. D 40, 2997 (1989)) (an exact consequence of a QCD-like relativistic field theory) is used to parametrize the masses of {bold 8} and 1{bold 0} baryons to second order in flavor breaking. Because at first order in flavor breaking, three-quark contributions to octet masses are very small, we neglect such contributions at second order and derive a corrected'' Gell-Mann--Okubo formula; when written in a way free from electromagnetic corrections, it is 1/2({ital n}+{Xi}{sup 0})+{ital T}=1/4(3{Lambda}+{Sigma}{sup +}) with {ital T}={Xi}{sup *{minus}}{minus}1/2({Omega}+{Sigma}{sup *{minus}}) and {cflx {Sigma}} {sup +}=2{Sigma}{sup +}{minus}{Sigma}{sup 0}+2({ital n}{minus}{ital p}). The two sides ofmore » the formula are respectively 1132.4{plus minus}0.8 and 1133.9{plus minus}0.1 MeV.« less
  • The general parametrization method (Phys. Rev. D 40, 2997 (1989)), an exact consequence of any QCD-like relativistic field theory, is used to parametrize the electromagnetic mass differences of the baryons. First we show that the Coleman-Glashow relationship, derived neglecting flavor breaking, continues to hold if all flavor-breaking terms are kept, except the three-quark ones; this may explain why the formula agrees so well with the data. In addition, neglecting only three-quark terms, we reproduce some equalities between electromagnetic mass differences of {bold 8} and 1{bold 0} baryons derived a long time ago (A. Gal and F. Scheck, Nucl. Phys. B2,more » 110 (1967)) by the nonrelativistic quark model (NRQM). Also these equalities, now testable due to the improved knowledge of decuplet masses, are well satisfied; they now appear as a general consequence of a relativistic QCD-like field theory, not just of the NRQM.« less
  • We present a study of axial charges of baryon ground and resonant states with relativistic constituent quark models. In particular, the axial charges of octet and decuplet N, {Sigma}, {Xi}, {Delta}, {Sigma}*, and {Xi}* baryons are considered. The theoretical predictions are compared to existing experimental data and results from other approaches, notably from lattice quantum chromodynamics and chiral perturbation theory. The relevance of axial charges with regard to {pi}-dressing and spontaneous chiral-symmetry breaking is discussed.