Alberto Devoto

High energy photon-neutrino interactions

A general decomposition of the amplitudes for the 2 {r_arrow} 2 processes {gamma}{nu} {r_arrow} {gamma}{nu} and {gamma}{gamma} {r_arrow} {nu}{bar {nu}} is obtained using gauge invariance and Bose symmetry. The restrictions implied by this decomposition are investigated for the reaction {gamma}{gamma} {r_arrow} {nu}{bar {nu}} by computing the one-loop helicity amplitudes in the standard model. In the center of mass, where {radical}s = 2{omega}, the cross section grows roughly as {omega}{sup 6} up to the threshold for W-boson production, {radical}s = 2m{sub W}. Astrophysical implications of very high energy photon-neutrino interactions are discussed.

Noncommutative QED corrections to e+ e- ---> gamma gamma gamma at linear collider energies

We compute the total cross section as well as angular and energy distributions for process

A fast cyber 205-ETA10 program for SU(3) lattice gauge theory☆

{e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\gamma}

High energy photon-neutrino elastic scattering

with both unpolarized and polarized beams in the framework of noncommutative quantum electrodynamics (NCQED). The calculation is performed in the center of mass of colliding electron and positron and is evaluated for energies and integrated luminosities appropriate to future linear colliders. We find that by using unpolarized beams it is possible to probe the Lorentz symmetry violating azimuthal dependence of the cross section. Furthermore, with polarized beams the left-right asymmetry of the

A new calculation of the order-g4 QCD corrections to the longitudinal structure function

CP

Noncommutative QED corrections to e{sup +}e{sup -}{yields}{gamma}{gamma}{gamma} at linear collider energies

violating NCQED amplitudes can be used to obtain bounds on the noncommutative scale

Noncommutative QED corrections toe+e−→γγγat linear collider energies

{\ensuremath{\Lambda}}_{\mathrm{NC}}

Noncommutative QCD corrections to the gluonic decays of heavy quarkonia

which exceed 1.0 TeV.

Correlation functions from probability densities

Abstract We describe a Monte Carlo program that simulates SU(3) lattice gauge theoryon CYBER 205 and ETA 10 computers. The program uses the Cabibbo Marinari algorithm for the updating and a novel way of gathering neighbors. It achieves a 17.1 μs updating time per link on a 2-pipe CYBER 205 using 32-bit arithmetic. The updating time per link on the ETA 10 at Florida State University is 8.8 μs.

Direct Analysis of Scaling Violations in Large q**2 Deep Inelastic Neutrino and Muon Scattering

The one-loop helicity amplitudes for the elastic scattering process