Abstract:

Supersymmetry (SUSY) is one of the most compelling extensions to the Standard Model (SM), and searches for SUSY particles are an important component of the BSM LHC physics program. The null results from experimental searches for SUSY are typically reported in the form of limits on so-called “SUSY simplified models” (SMS). While these models provide an easily interpretable picture of the sensitivity of searches, they do not capture all of the rich phenomenology present in complete MSSM scenarios, particularly when no assumptions on the SUSY breaking mechanism are made. Therefore, they do not provide a complete picture of the exclusion reach of searches in the full MSSM. In this talk, we will motivate the electroweak sector of SUSY and discuss the interpretation of ATLAS searches for electroweakinos in the phenomenological MSSM (pMSSM). We will discuss how this interpretation significantly differs from the one naïvely obtained in terms of SMSs, and highlight scenarios that remain viable.

Emanuele Bagnaschi is a theoretical physics working mainly on collider phenomenology. Among his research interests, he worked extensively on various aspects of supersymmetric extensions of the Standard Model. He is also currently one of the theory conveners of the MSSM subgroup of the LHC Higgs Working group. He studied for his doctorate in Paris, at the Laboratoire de Physique Théorique et Hautes Energies (LPTHE) from 2011 to 2014. He then held postdoctoral positions at DESY, PSI, U. Roma Tre and CERN. In 2022 he landed a job as researcher at the Istituto Nazionale di Fisica Nucleare (INFN). He currently works in the theory group of the INFN Laboratori Nazionali di Frascati, close to Rome.

Ben Hodkinson is an experimental physicist working on the ATLAS experiment. His research interests include searches for electroweak supersymmetry and their interpretation in the pMSSM, and the performance of missing transverse momentum reconstruction in ATLAS. He obtained his PhD from the University of Cambridge in 2023 and is currently a postdoctoral researcher at the University of Oxford. He convenes the ATLAS jet software sub-group and is active on several analyses in the ATLAS SUSY group.