I. Current commutators in quantum electrodynamics. II. Electromagnetic mass differences of the pseudoscalar meson and baryon octets
<p>This thesis is in two parts. In the first section, the operator structure of the singular terms in the equal-time commutator of space and time components of the electromagnetic current is investigated in perturbation theory by establishing a connection with Feynman diagrams. It is made...
| Summary: | <p>This thesis is in two parts. In the first section, the operator
structure of the singular terms in the equal-time commutator of space
and time components of the electromagnetic current is investigated in
perturbation theory by establishing a connection with Feynman diagrams.
It is made very plausible that the singular term is a c number. Some
remarks are made about the same problem in the electrodynamics of a
spinless particle.</p>
<p>In the second part, an SU(3) symmetric multi-channel calculation
of the electromagnetic mass differences in the pseudoscalar meson and
baryon octets is carried out with an attempt to include some of the
physics of the crossed (pair annihilation) channel along the lines of
the recent work by Ball and Zachariasen. The importance of the tensor
meson Regge trajectories is emphasized. The agreement with experiment
is poor for the isospin one mass differences, but excellent for
those with isospin two.</p> |
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