Exploration at the high-energy frontier: ATLAS Run 2 searches investigating the exotic jungle beyond the Standard Model

Abstract

This report presents a comprehensive collection of searches for new physics performedby the ATLAS Collaboration during the Run 2 period of data taking at the Large HadronCollider, from 2015 to 2018, corresponding to about 140 fb−1 of√s = 13 TeV proton–proton collision data. These searches cover a variety of beyond-the-standard modeltopics such as dark matter candidates, new vector bosons, hidden-sector particles,leptoquarks, or vector-like quarks, among others. Searches for supersymmetric particlesor extended Higgs sectors are explicitly excluded as these are the subject of separatereports by the Collaboration. For each topic, the most relevant searches are described,focusing on their importance and sensitivity and, when appropriate, highlighting theexperimental techniques employed. In addition to the description of each analysis, complementarysearches are compared, and the overall sensitivity of the ATLAS experimentto each type of new physics is discussed. Summary plots and statistical combinations ofmultiple searches are included whenever possible.