Scalar and axial matrix elements of the nucleon: Sea quark content
نویسندگان
چکیده
منابع مشابه
Scalar and Axial Matrix Elements of the Nucleon: Sea Quark Content
In the numerical study of many hadronic properties, a comparison of the full QCD and the quenched approximation results shows that the differences are small (though the bare gauge couplings in the two cases are quite different); small enough that given the various sources of errors it is hard to differentiate between the two sets of numbers. Also the phenomenological quark models, which ignore ...
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Current issues associated with nucleon axial matrix elements are studied, including the Goldberger-Treiman discrepancy, the induced pseudoscalar, and SU(3) chiral perturbation theory.
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We examine the effects of SU(3) breaking in the matrix elements of the flavour-diagonal axial currents between octet baryon states. Our calculations of K, η and π loops indicate that the SU(3) breaking may be substantial for some matrix elements and at the very least indicate large uncertainties. In particular, the strange axial matrix element in the proton determined from the measurements of g...
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A physical model for parton densities in hadrons, based on Gaussian momentum fluctuations of partons and hadronic baryon-meson fluctuations, is presented. The model has previously been shown to describe proton structure function data, and is now applied to sea quark asymmetries and shown to describe the ¯ d − ¯ u asymmetry of the proton. By considering fluctuations involving strange quarks, the...
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Ronald Babich∗ , a Richard Brower,ab Michael Clark,b George Fleming,c James Osborn,d and Claudio Rebbiab aDepartment of Physics, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA bCenter for Computational Science, Boston University, 3 Cummington Street, Boston, MA 02215, USA cDepartment of Physics, Yale University, New Haven, CT 06520, USA dArgonne Leadership Computing Facility,...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 1992
ISSN: 0920-5632
DOI: 10.1016/0920-5632(92)90273-u