210 research outputs found
Allowed Eta Decay Modes and Chiral Symmetry
Recently, the development of chiral perturbation theory has allowed the
generation of rigorous low energy theorems for various hadronic processes based
only on the chiral invariance of the underlying QCD Lagrangian. Such techniques
are highly developed and well tested in the domain of pionic and kaonic
reactions. In this note we point out that with the addition of a few additional
and reasonable assumptions similar predictive power is available for processes
involving the eta meson.Comment: Contribution to Eta Physics Handbook, Workshop on Eta Physics,
Uppsala 2001, 28 page latex file with 9 figure
Weak Hypernuclear Decay
Because of Pauli suppression effects the decay of the free
is not of importance in hypernuclei with . Rather the decay of such
hypernuclei proceeds via the nucleon-stimulated mode ,
analysis of which presents a considerable theoretical challenge and about which
there exists only a limited amount of experimental information. Herein we
confront existing data wih various theoretical analyses which have been
developed.Comment: 19 page standard Latex file; invited talk at 2nd DAFNE Workshop,
April, 199
Introduction to Effective Field Theory
An introduction to methods of effective field theory is given. Examples are
presented, including Rayleigh scattering from nonrelativistic quantum mechnics,
chiral perturbation theory/QCD as well as electromagnetic and weak interactions
of nucleons.Comment: 12 page latex file, Talk given at European Few Body Physics Meeting,
Evora, Portugal, September 200
Hadronic Parity Violation: an Analytic Approach
Using a recent reformulation of the analysis of nuclear parity-violation (PV)
within the framework of effective field theory (EFT), we show how predictions
for parity-violating observables in low-energy light hadronic systems can be
understood in an analytic fashion. It is hoped that such an analytic approach
may encourage additional experimental work as well as add to the understanding
of such parity-violation phenomena, which is all too often obscured by its
description in terms of numerical results obtained from complex two-body
potential codes.Comment: 49 pages, 4 figures, dedicated to the memory of Dubravko Tadi
Low Energy Tests of Chiral Symmetry
The present status of low energy test of chiral invariance via chiral
perturbation theory is reviewed, both in the meson and baryon sectors, and
future prospects are discussed.Comment: Invited talk given at PANIC 96, Standard 8 page Latex fil
Nucleon Polarizabilities
The subject of nucleon polarizabilities in real, virtual, and doubly virtual
Compton scattering is discussed with respect to what is known and how such
quantities can be extracted from data.Comment: 13 page Latex file; Talk given at Chiral Dynamics 2000 Workshop,
Jefferson Lab, July 200
GDH2000 Convenor's Report: Spin Polarizabilities
The subject of low energy polarized Compton scattering from the proton, which
is characterized by phenomenological spin-polarizabilities, is introduced and
connection is made to new theoretical and experimental developments which were
reported to this meeting.Comment: 13 page Latex file, Talk given at GDH2000 Workshop, Mainz, June, 200
Is SU(3) Chiral Perturbation Theory an Effective Field Theory?
We argue that the difficulties associated with the convergence properties of
conventional SU(3) chiral perturbation theory can be ameliorated by use of a
cutoff, which suppresses the model-dependent short distance effects in such
calculations.Comment: Talk given at Workshop on Quark-Hadron Degrees of Freedom, CSSM,
Adelaide, March 199
Hyperon Physics-a Personal Overview
A range of issues in the field of hyperon physics is presented, together with
an assessment of where important challenges remain.Comment: Introductory talk given at FNAL Hyperon99 Workshop--6pg latex fil
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