Supersymmetric seesaw type II: CERN LHC and lepton flavour violating phenomenology

TL;DR

This paper explores the phenomenology of supersymmetric type-II seesaw models, analyzing lepton flavor violation at the LHC and low energies, and how these observations relate to neutrino parameters and the seesaw scale.

Contribution

It provides a detailed analysis of LFV processes in supersymmetric type-II seesaw models, linking collider and low-energy data to neutrino physics and the seesaw scale.

Findings

LFV branching ratios can be related to neutrino oscillation parameters.

Measurements at the LHC can indirectly determine the seesaw scale.

Predicted LFV signals could be observable at current or future experiments.

Abstract

We study the supersymmetric version of the type-II seesaw mechanism assuming minimal supergravity boundary conditions. We calculate branching ratios for lepton flavour violating (LFV) scalar tau decays, potentially observable at the LHC, as well as LFV decays at low energy, such as $l_i \to l_j + \gamma$ and compare their sensitivity to the unknown seesaw parameters. In the minimal case of only one triplet coupling to the standard model lepton doublets, ratios of LFV branching ratios can be related unambigously to neutrino oscillation parameters. We also discuss how measurements of soft SUSY breaking parameters at the LHC can be used to indirectly extract information of the seesaw scale.