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34 papers · 1 filter
Electromagnetic form factor of the pion
H. Leutwyler
The Standard Model prediction for the magnetic moment of the muon requires a determination of the electromagnetic form factor of the pion at high precision. It is shown that the re…
Strong Interactions at Low Energy
H. Leutwyler
The lectures review some of the basic concepts relevant for an understanding of the low energy properties of the strong interactions: chiral symmetry, spontaneous symmetry breakdow…
pi-pi scattering: theory is ahead of experiment
H. Leutwyler
I draw attention to a recent breakthrough in the field of low energy pion physics: the consequences of the hidden symmetry of the QCD Hamiltonian have successfully been incorporate…
Explicit generating functional for pions and virtual photons
J. Schweizer
We construct the explicit one-loop functional of chiral perturbation theory for two light flavours, including virtual photons. We stick to contributions where 1 or 2 mesons and at…
Amplification by stochastic interference
K. Svozil, D. Felix, K. Ehrenberger
A new method is introduced to obtain a strong signal by the interference of weak signals in noisy channels. The method is based on the interference of 1/f noise from parallel chann…
Possible in situ Tests of the Evolution of Elemental and Isotopic Abundances in the Solar Convection Zone
S. Turcotte, R. F. Wimmer-Schweingruber
Helioseismology has shown that the chemical composition of the Sun has changed over its lifetime. The surface abundance of helium and heavy elements is believed to have decreased b…