3 papers
hep-ph2003
Strong Anomalies in Kaon Decays
S. Trine
We point to a potentially large contribution of the QCD trace anomaly to the isoscalar pion pair production in Kaon decays. This contribution arises from the long-distance evolutio…
hep-ph2000
Analytical Behaviour of Positronium Decay Amplitudes
G. Lopez Castro, J. Pestieau, C. Smith +1
Positronium annihilation amplitudes that are computed by assuming a factorization approximation with on-shell intermediate leptons do not exhibit good analytical behaviour. Using d…
hep-ph2000
Parapositronium Decay and Dispersion Relations
G. Lopez Castro, J. Pestieau, C. Smith +1
Positronium decay rates are computed at the one-loop level, using convolution-type factorized amplitudes. The dynamics of this factorization is probed with dispersion relations, sh…