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5 papers · 2 filters
Soft Photon Spectrum in Orthopositronium and Vector Quarkonium Decays
J. Pestieau, C. Smith
QED gauge invariance, when combined with analyticity, leads to constraints on the low energy end of the emitted photon spectra. This is known as Low's theorem. It is shown that the…
A New Basis for QED Bound State Computations
J. Pestieau, C. Smith
A simple method to compute QED bound state properties is presented, in which binding energy effects are treated non-perturbatively. It is shown that to take the effects of all ladd…
Oscillations of neutrinos and mesons in quantum field theory
Mikael Beuthe
This report deals with the quantum field theory of particle oscillations in vacuum. We first review the various controversies regarding quantum-mechanical derivations of the oscill…
What is the (epsilon'/epsilon)_exp Telling Us ?
Andrzej J. Buras, Jean-Marc Gérard
Nature might be kinder than previously thought as far as epsilon'/epsilon is concerned. We show that the recently obtained experimental value for epsilon'/epsilon does not require…
Positronium Decay : Gauge Invariance and Analyticity
J. Pestieau, C. Smith, S. Trine
The construction of positronium decay amplitudes is handled through the use of dispersion relations. In this way, emphasis is put on basic QED principles: gauge invariance and soft…