Hidden Thresholds: Reconstructing NP Masses

TL;DR

The paper introduces the Hidden Thresholds method to reconstruct masses of new physics particles from collider decay data, demonstrated with MSSM examples involving neutralinos and charginos.

Contribution

It presents a novel technique for reconstructing NP masses from multiple decay channels at hadron colliders, applicable to complex MSSM scenarios.

Findings

Successfully reconstructs neutralino and chargino masses

Applicable to multiple simultaneous decay channels

Demonstrated with realistic MSSM examples

Abstract

The Hidden Thresholds technique reconstructs New Physics (NP) masses from two or more simultaneous NP decays at a hadron collider. We show how this works in several MSSM examples: $\widetilde{\chi}_{i}^0 \widetilde{\chi}_{j}^0 \to e^+ e^- \mu^+ \mu^- \widetilde{\chi}_{1}^0 \widetilde{\chi}_{1}^0$ ($i,j=2,3,4$) and ${\widetilde\chi_1}^\pm {\widetilde\chi_2}^0 \to {W^\pm}^*(\to \ell^\pm \nu) {\widetilde\chi_1}^0 ~ {Z^0}^*(\to \ell^\pm \ell^\mp) {\widetilde\chi_1}^0 $.