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Journal ArticleDOI

Estimate of strangeness content of the nucleon

01 Nov 1990-Journal of Physics G (IOP Publishing)-Vol. 16, Iss: 11
TL;DR: In this paper, the SU(3) relationship among the meson-baryon coupling constant was exploited to estimate the strangeness content of the nucleon. But the role of the gluonic couplings of the eta and eta mesons was not explored.
Abstract: Utilizing the quark-glue structure of the eta and eta ' mesons and exploiting the SU(3) relationships among the meson-baryon coupling constant, the authors show that the baryon loop calculation of the pi 0, eta , eta ' to gamma gamma amplitudes allows one a straightforward estimation of the strangeness content in the nucleon. The role of the gluonic couplings of the eta and eta ' is explored.
Citations
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Journal ArticleDOI
TL;DR: A comprehensive review paper on the theory and phenomenology of polarized deep inelastic scattering is presented in this paper, where the authors present a set of experiments and experiments with polarized DIRs.

255 citations

Journal ArticleDOI
TL;DR: A comprehensive review paper on the theory and phenomenology of polarized deep inelastic scattering is presented in this article, where the authors present a set of experiments and experiments with polarized DIRs.
Abstract: Comprehensive review paper on the theory and phenomenology of polarized deep inelastic scattering, to appear in Physics Reports

226 citations

Journal ArticleDOI
TL;DR: In this paper, a review on the theoretical aspects and experimental results of polarized deep inelastic scattering and of other hard scattering processes is presented, with a focus on the first moment of the polarized structure function in various factorization schemes, which is related to the axial anomaly, and on its relevance for understanding the origin of the proton spin.

154 citations

Journal ArticleDOI
TL;DR: A review on the theoretical aspects and experimental results of polarized deep inelastic scattering and of other hard scattering processes is presented in this paper, where longitudinally polarized structure functions are discussed.
Abstract: A review on the theoretical aspects and the experimental results of polarized deep inelastic scattering and of other hard scattering processes is presented. The following items are discussed: longitudinally polarized structure functions, results from the SLAC and CERN polarization experiments, the QCD interpretation and the LO and NLO Q2-evolution of g1, the role of the polarized gluon density, the expectations for x-->0, sum rules, the first moment of the polarized structure function, the parametrizations of polarized parton densities, polarized jet, heavy quark and direct photon production, DIS semi-inclusive asymmetries and elastic neutrino-proton scattering, single and double spin asymmetries, structure functions for higher spin hadrons and nuclei, nonperturbative approaches, the transverse structure function g2, chiral-odd 'transversity' distributions.

15 citations

Journal ArticleDOI
TL;DR: In this paper, the authors consider the divergence of the gauge invariant flavour singlet axial current and show by a careful analysis that isospin-dependent terms persist in it and relate the axial singlet charge to the sum of the quark spin contributions and F D ratio.
References
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Journal ArticleDOI
TL;DR: In this paper, the anomalous Ward identities are shown to satisfy consistency or integrability relations, which restrict their possible form, for the case of SU(3) × SU(1) and for SU(2) + SU (3) + 2.

2,450 citations

Journal ArticleDOI
TL;DR: In this paper, a new mathematical framework for the Wess-Zumino chiral effective action is described, and it is shown that this action obeys an a priori quantization law, analogous to Dirac's quantization of magnetic change.

2,132 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the behavior under SU3×SU3 of the hadron energy density and the closely related question of how the divergences of the axial-vector currents and the strangeness-changing vector currents transform under SU 3×SU 3.
Abstract: We investigate the behavior under SU3×SU3 of the hadron energy density and the closely related question of how the divergences of the axial-vector currents and the strangeness-changing vector currents transform under SU3×SU3. We assume that two terms in the energy density break SU3×SU3 symmetry; under SU3 one transforms as a singlet, the other as the member of an octet. The simplest possible behavior of these terms under chiral transformations is proposed: They are assigned to a single (3,3*)+(3*,3) representation of SU3×SU3 and parity together with the current divergences. The commutators of charges and current divergences are derived in terms of a single constant c that describes the strength of the SU3-breaking term relative to the chiral symmetry-breaking term. The constant c is found not to be small, as suggested earlier, but instead close to the value (-sqrt[2]) corresponding to an SU2×SU2 symmetry, realized mainly by massless pions rather than parity doubling. Some applications of the proposed commutation relations are given, mainly to the pseudoscalar mesons, and other applications are indicated.

1,475 citations

Journal ArticleDOI
TL;DR: In this paper, the coupling constants of different particle interactions and particle decays are compiled, and the correlation coefficients of different interactions and decays of different particles are analyzed. But the coupling coefficients of particle interactions are not discussed.

413 citations