3 papers
hep-ph2020
Parametrizations of the Spin Density Matrix
Elvio Di Salvo, Ziad Jean Ajaltouni
We propose for the spin density matrix two parametrizations which automatically fulfil the non-negativity conditions, without setting any bound on the parameters. The first one rel…
hep-ph2019
Polarization in (quasi-)two-body decays and new physics
Z. J. Ajaltouni, E. Di Salvo
We consider two-body and quasi-two-body decays of the type , where and are spin-1/2 fermions and a spin-0 or spin-1 boson. After recalling the non-co…
hep-ph2004
Q^2 Dependence of the azimuthal Asymmetry in Unpolarized Drell-Yan
E. Di Salvo
We study the azimuthal asymmetry of the unpolarized Drell-Yan in the framework of the T-odd functions. We find, on the basis of quite general arguments, that for |{\bf q}_{\perp}|…