Photon decay rate of sigma plus from unsubtracted dispersion relations
Papaioannou, Gregory Miltiades
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https://hdl.handle.net/2142/25779
Description
Title
Photon decay rate of sigma plus from unsubtracted dispersion relations
Author(s)
Papaioannou, Gregory Miltiades
Issue Date
1969
Doctoral Committee Chair(s)
Nishijima, K.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
photon decay
unsubtracted dispersion relations
integral representations
weak photon decay amplitudes
Language
en
Abstract
Taking the viewpoint of unsubtracted dispersion relations we derive
integral representations for the weak photon decay amplitudes Fl and F2.
The integrals involve the magnetic and electric dipole amplitudes M and
.1
Eo+ of the photopion production. They also involve the pion-nucleon
scattering phase shifts of the states Pll, P3l, Sll and S3l , The integrals
were carried out on a computer and the relative decay rate of Sigma+ -> py to
its total rate was found to be 0.71 x 10-3, which is comparable with the latest experimental value (1.9 ± 0.4) x 10^-3.
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