Eur. Phys. J. C 20, 659-675 (2001)
DOI: 10.1007/s100520100684

The processes in SM and MSSM

G.J. Gounaris¹, P.I. Porfyriadis¹ and F.M. Renard<sup>2

1</sup>  Department of Theoretical Physics, Aristotle University of Thessaloniki, 54006, Thessaloniki, Greece
²  Physique Mathématique et Théorique, UMR 5825, Université Montpellier II, 34095 Montpellier Cedex 5, France

(Received: 13 March 2001 / Published online: 13 June 2001 -© Springer-Verlag / Società Italiana di Fisica 2001)

Abstract
The process first arises at the one loop level, and as such it provides us with remarkable tests of the structure of the electroweak Higgs sector. These tests are complementary to those in the gauge sector involving . We show that in the standard model (SM) where H=H_SM, as well as in the supersymmetric case where H=h⁰, H⁰ or A⁰, observables exist (like e.g. the energy dependence, angular distribution, photon polarization dependence or final Z polarization) which present rather spectacular properties. Such properties involve strong threshold effects with steps, bumps or peaks, reflecting the type of Higgs and heavy quarks and chargino masses and couplings predicted by the SM and supersymmetric models.

© Società Italiana di Fisica, Springer-Verlag 2001