Polarization and Spin Effects in Neutralino Production and Decay in Supersymmetric Models

TL;DR

This paper investigates how polarization and spin correlations in neutralino production and decay at a linear collider can distinguish between different supersymmetric models, revealing significant model-dependent effects.

Contribution

It provides a detailed comparison of polarization and spin effects in MSSM, NMSSM, and E6-inspired models, highlighting their potential to differentiate supersymmetric theories.

Findings

Polarization and spin effects vary significantly across models.

Decay angular distributions depend on gaugino mass M_1.

Model-specific signatures can be observed with polarized beams.

Abstract

We study polarization and spin correlation effects in the MSSM and in extended supersymmetric models at an e^+e^- linear collider with polarized beams. The production of light neutralinos e^+ e^- --> \tilde\chi^0_1 \tilde\chi^0_2 and the subsequent decay \tilde\chi^0_2 --> \tilde\chi^0_1 e^+ e^- including full spin correlations is compared in three supersymmetric models: MSSM, NMSSM and an E_6-inspired model with an additional U(1)' gauge group. It is shown that polarization and spin effects can lead to a complete different behavior of these models. Finally, the dependence of the cross section and the decay angular distribution on the gaugino mass parameter M_1 for polarized beams is briefly outlined.