3 research outputs found
Chiral aspects of hadron structure
Chiral loop corrections for hadronic properties are considered in a
constituent quark model. It is emphasized that the correct implementation of
such corrections requires a sum over intermediate hadronic states. The leading
non-analytic corrections are very important for baryon magnetic moments and
explain the failure of the sum rule
predicted by the
constituent quark model.Comment: 10 pages, latex, 2 ps figures, to appear in Phys. Lett.
Strange Hadronic Loops of the Proton: A Quark Model Calculation
Nontrivial sea effects have their origin in the low- dynamics
of strong QCD. We present here a quark model calculation of the contribution of
pairs arising from a {\it complete} set of OZI-allowed strong
hadronic loops to the net spin of the proton, to its charge radius,
and to its magnetic moment. The calculation is performed in an ``unquenched
quark model" which has been shown to preserve the spectroscopic successes of
the naive quark model and to respect the OZI rule. We speculate that an
extension of the calculation to the nonstrange sea will show that most of the
``missing spin" of the proton is in orbital angular momenta.Comment: revtex, 34 pages, 4 figure