Hidden Thresholds: Reconstructing NP Masses

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 ${\widetilde\chi_1}^\pm {\widetilde\chi_2}^0 \to {W^\pm}^*(\to \ell^\pm \nu) {\widetilde\chi_1}^0 ~ {Z^0}^*(\to \ell^\pm \ell^\mp) {\widetilde\chi_1}^0$.