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Titolo:
Charge symmetry breaking via Delta I=1 group theory or by the u-d quark mass difference and direct photon exchange
Autore:
Coon, SA; Scadron, MD;
Indirizzi:
New Mexico State Univ, Dept Phys, Las Cruces, NM 88003 USA New Mexico State Univ Las Cruces NM USA 88003 s, Las Cruces, NM 88003 USA Univ Arizona, Dept Phys, Tucson, AZ 85721 USA Univ Arizona Tucson AZ USA 85721 Arizona, Dept Phys, Tucson, AZ 85721 USA
Titolo Testata:
REVISTA MEXICANA DE FISICA
, volume: 46, anno: 2000, supplemento:, 1
pagine: 23 - 29
SICI:
0035-001X(200009)46:<23:CSBVDI>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
LINEAR SIGMA-MODEL; PROTON ELASTIC-SCATTERING; DYNAMICAL GENERATION; ASYMMETRY; MESON; VECTOR; DECAYS; NUCLEI;
Keywords:
charge symmetry breaking; u-d quark masses;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
51
Recensione:
Indirizzi per estratti:
Indirizzo: Coon, SA New Mexico State Univ, Dept Phys, Las Cruces, NM 88003 USA New Mexico State Univ Las Cruces NM USA 88003 uces, NM 88003 USA
Citazione:
S.A. Coon e M.D. Scadron, "Charge symmetry breaking via Delta I=1 group theory or by the u-d quark mass difference and direct photon exchange", REV MEX FIS, 46, 2000, pp. 23-29

Abstract

Charge symmetry breaking (CSB) in the strong NN interaction is believed tohave its origins at the quark level. However, the meson-exchange potentials which successfully describe the empirical CSB utilize instead values of the Delta I = 1 pi eta and rho omega mixing obtained with the aid of group theory from a hadronic tadpole hamiltonian introduced by Coleman and Glashowto describe electromagnetic mass splitting in hadronic isospin multiplets. We review i) the CSB NN potentials so constructed and their nuclear chargeasymmetry effects, ii) the universal scale of the Coleman-Glashow tadpole,and iii) the quark loop evaluation of both meson mass differences and meson mixing. The latter quark loop calculations, which use chiral symmetry to evaluate the integrals, demonstrate clearly that the u-d constituent quark mass difference, long suspected as the origin of CSB, does quantitatively yield the universal Coleman-Glashow tadpole scale which underlies the successful meson-exchange description of CSB in nuclear physics.

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Documento generato il 24/09/20 alle ore 04:21:09