505 research outputs found
Gluonic effects in eta and eta-prime physics
We review the theory and phenomenology of the axial U(1) problem with
emphasis on the role of gluonic degrees of freedom in eta and eta' production
processes, especially the low-energy pN -> pN eta and pN -> pN eta' reactions.Comment: 20 pages, 2 figures, Invited talk at the WASA Workshop on Eta
Physics, October 2001, Uppsala, Swede
Neutrinos from spin dynamics
We conjecture that neutrino physics might correspond to the spontaneous
magnetisation phase of an Ising-like spin model interaction coupled to neutrino
chirality which operates at scales close to the Planck mass. We argue that this
scenario leads to a simple extension of the Standard Model with no additional
parameters that dynamically generates parity violation and spontaneous symmetry
breaking for the gauge bosons which couple to the neutrino. The neutrino mass
in the model ~ (the electroweak scale)^2 / 2M where M is the scale of the
``spin-spin'' interaction. For the ground state of the model the free energy
density corresponding to the cosmological constant is ~ the neutrino mass,
consistent with observation.Comment: 9 page
- …