Tau sleptons and Tau sneutrino Decays in MSSM under the Cosmological Bounds

TL;DR

This paper numerically investigates fermionic two-body decays of tau sleptons and tau sneutrino in the MSSM, considering cosmological WMAP bounds, and explores CP-phase effects on decay properties and tau polarization.

Contribution

It provides a detailed analysis of CP-phase dependencies in tau slepton and sneutrino decays within the MSSM under cosmological constraints, highlighting potential probes of CP violation.

Findings

Decay widths significantly depend on CP phases.

CP phases can serve as probes for additional CP sources.

Tau polarization in decays offers observable signatures.

Abstract

We present the numerical investigation of the fermionic two-body decays of tau sleptons $\tilde \tau_{1,2}$ and $\tau$ sneutrino in the Minimal Supersymmetric Standard Model with complex parameters. In the analysis we particularly take into account the cosmological bounds imposed by WMAP data. We plot the CP-phase dependences for each fermionic two-body channel of $\tilde \tau_{1,2}$ and $\tau$ sneutrino and speculate about the branching ratios and total (two-body) decay widths. We find that the phase dependences of the decay widths of the third family sleptons are quite significant which can provide viable probes of additional CP sources. We also draw attention to the polarization of the final-state tau in the $ \tilde \tau_{1,2}$ decays.