Implementation of full and simplified likelihoods in CheckMATE

Abstract

We present the implementation of simplified and full likelihood models for multibin signal regions in CheckMATE. A total of 13 searches are included from ATLAS and CMS, and several methods are presented for the implementation and evaluation of likelihood functions. Statistical combinations increase the sensitivity of searches and open up the possibility of combining orthogonal search channels in the CheckMATE framework.

Figures (14)

• Figure 1: Validation plots for the search atlas_1908_03122 (SUSY-2018-31). Top row: the model with $m_{\tilde{\chi}_{1}^0} = 60$ GeV; bottom row: the model with $\Delta m(\tilde{\chi}_{2}^0,\tilde{\chi}_{1}^0) = 130$ GeV. Left panels: observed limits; right panels: expected limits.
• Figure 2: Validation plots for the search atlas_1908_08215 (SUSY-2018-33), slepton pair production. Left panels: observed limits; right panels: expected limits.
• Figure 3: Validation plots for the search atlas_1911_06660 (SUSY-2018-04). Left panels: observed limits; right panels: expected limits. In the bottom row: a comparison between the observed limits derived with and without control regions.
• Figure 4: Validation plots (left: observed limits; right: expected limits) for the search atlas_1911_12606 (SUSY-2018-16), slepton pair production. Top row: smuon search; bottom row: selectron search. Left panel: observed limits; right panel: expected limits.
• Figure 5: Validation plots for the search atlas_1911_12606 (SUSY-2018-16). Top row: $m(\tilde{\chi}_{2}^{0}) \times m(\tilde{\chi}_{1}^{0})>0$; middle row: $m(\tilde{\chi}_{2}^{0}) \times m(\tilde{\chi}_{1}^{0})<0$. Left panels: observed limits; right panels: expected limits. In the bottom row comparison of expected 1-$\sigma$ bands of ATLAS and CheckMATE full likelihood model for the same-parity case.