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65 papers · 2 filters
The pinch technique at two-loops: The case of mass-less Yang-Mills theories
Joannis Papavassiliou
The generalization of the pinch technique beyond one loop is presented. It is shown that the crucial physical principles of gauge-invariance, unitarity, and gauge-fixing-parameter…
The Pinch Technique at Two Loops
Joannis Papavassiliou
It is shown that the fundamental properties of gauge-independence, gauge-invariance, unitarity, and analyticity of the -matrix lead to the unambiguous generalization of the pinc…
Tau Physics
A. Pich
The pure leptonic or semileptonic character of tau decays makes them a good laboratory to test the structure of the weak currents and the universality of their couplings to the gau…
pi^0-eta Mixing and CP Violation
G. Ecker, G. Mueller, H. Neufeld +1
We discuss - mixing and its implication for to next-to-leading order in the low-energy expansion. The big effect due to - mixing is shown to be largely canc…
Influence of solar chaotic magnetic fields on neutrino oscillations
E. Torrente-Lujan
We consider the effect of a random magnetic field in the convective zone of the Sun on resonant neutrino spin-flavour oscillations. The expected signals in the different experiment…
Electromagnetic Decays of Heavy Baryons
M. C. Banuls, A. Pich, I. Scimemi
The electromagnetic decays of the ground state baryon multiplets with one heavy quark are calculated using Heavy Hadron Chiral Perturbation Theory. The M1 and E2 amplitudes for S^{…