Photon decay rate of sigma plus from unsubtracted dispersion relations

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Year dc:date

2011

Author dc:creator

• Papaioannou, Gregory Miltiades

Contributors dc:contributor

• Nishijima, K.

• photon decay
• unsubtracted dispersion relations
• integral representations
• weak photon decay amplitudes

Statement dc:rights

• 1969 Gregory Miltiades Papaioannou

Language dc:language

en

Identifier

6068781

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/25779