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29 papers · 1 filter
Time evolution of observable properties of parametrized systems
P. Hajicek
A short review of some recent work on the problem of time and of observables for the reparametrization invariant systems is given. A talk presented at the Second Meeting on Constra…
Heavy Majorana neutrinos in e^-e^- collisions
C. Greub, P. Minkowski
We discuss the process mediated by heavy Majorana neutrino exchange in the t- and u channel. In our model the cross section for this reaction is a function of…
Questionable and unquestionable in the perturbation theory of non-Abelian models
Ferenc Niedermayer, Max Niedermaier, Peter Weisz
We show, by explicit computation, that bare lattice perturbation theory in the two-dimensional O(n) nonlinear models with superinstanton boundary conditions is divergent in the…
Neutrinoless Double Beta Decay and its "Inverse"
Clemens A. Heusch, Peter Minkowski
Recent considerations by these authors pointed out the attractive features which a search for the exchange of heavy Majorana neutrinos could have for solving the mass and the lepto…
Light Quark Masses
H. Leutwyler
Lecture Notes, Summer School on Masses of Fundamental Particles, Cargese, 1996. In the first part, some qualitative aspects the mass pattern are discussed, concerning the breaking…
Phonons as Goldstone Bosons
H. Leutwyler
The implications of the hidden, spontaneously broken symmetry for the properties of the sound waves of a solid are analyzed. Although the discussion does not go beyond standard wis…