3 research outputs found
Light by Light Scattering at High Energy: a Tool to Reveal New Particles
We point out a few remarkable properties of the
process at high energy. They should allow to search for effects of new
particles and interactions. We give illustrations with threshold effects due to
pairs of new charged particles (charginos, charged Higgses, sfermions),
resonance effects due to s-channel production of neutral scalars (standard or
supersymmetric Higgs particles, technipions) and unitarity saturating
amplitudes due to a strongly interacting sector. The use of polarized photon
beams is also briefly discussed.Comment: 8 pages and 3 figures, typos corrected. e-mail:
[email protected]
Application of the Faddeev-Jackiw formalism to the gauged WZW model
The two-flavor Wess-Zumino model coupled to electromagnetism is treated as a
constraint system using the Faddeev-Jackiw method. Expanding into series of
powers of the pion fields and keeping terms up to second and third order we
obtain Coulomb- gauge Lagrangeans containing non-local terms.Comment: 10 pages, LaTe
The ionization of H, He and Ne atoms using neutrinos or antineutrinos at keV energies
We calculate the ionization cross sections for H, He or Ne atoms using
and scattering at keV energies. Such cross sections are
useful for e.g. -oscillation experiments using a tritium source.
Using realistic atomic wave functions, we find that for E_\nu \lsim 10 ~\rm
keV the atomic ionization cross sections, normalized to one electron per unit
volume, are smaller than the corresponding free electron ones, and that they
approach it from below as energies of 20 keV are reached.Comment: 13 pages, 5 figures: Realistic atomic wave functions are used
inducing numerical changes in the results. e-mail: [email protected]