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and got to write the notes on his lectures on meson-
nucleon
scattering. He suggested that I work on Particle
Physics, what used to be called Elementary Particles.
As a first topic he asked me to calculate meson
production in antiproton annihilation. The next
topic was on electromagnetic properties of baryons. Susumu
Okubo, Robert Marshak and I published a paper on broken baryon symmetry
and sum rules for electromagnetic properties; Okubo went on to develop
the method for SU (3) and obtained the famous mass formulae for
baryon and meson masses.
Alan Macfarlane and me completed the electromagnetic
mass differences formulae of Sidney Coleman and
Sheldon Glashow: we computed the sigma- lambda
transition mass and transition magnetic moment.
The year 1956 was an exciting year. Parity violation
was predicted by TD Lee and CN Yang and its verification
and accurate measurements were carried out by
CS Wu in association with E. Ambler, et al. from the National Bureau
of Standards. Corresponding work was done by Leon Lederman
and collaborators for the Muon processes.
But the more one obtained new data on nuclear
beta decay, the more confused became the situation
regarding the specific form of the beta interaction.
In addition to it, the attractive hypothesis of universal Fermi
interaction by Jaime Tiomno and John Wheeler did
not seem to fit in. Recall that in 1955 the most
favored beta decay combination was scalar plus tensor (with
no parity violation).
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