ELECTROMAGNETIC EFFECTS IN PSI'-]J-PSI+PI-O AND QUARK MASSES
Journal or Book Title
PHYSICS LETTERS B
We investigate the contribution of electromagnetism to the decay ψ′ → J/ψ + π0, and find it to be small compared to the effect of quark masses, calculated via the axial anomaly. The decay rate is then a reliable measure of quark masses, and we extract (md−mu)/ms = 0.033±0.005.
Donoghue, JF and TUAN, SF, "ELECTROMAGNETIC EFFECTS IN PSI'-]J-PSI+PI-O AND QUARK MASSES" (1985). PHYSICS LETTERS B. 193.
Retrieved from https://scholarworks.umass.edu/physics_faculty_pubs/193