Search For Long Lived Neutral Particles In Final States With A Muon And Multi Track Displaced Vertex With The Atlas Detector At The Large Hadron Collider

Search for Long-lived Neutral Particles in Final States with a Muon and Multi-track Displaced Vertex with the ATLAS Detector at the Large Hadron Collider

Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards

Search for Massive, Long-lived Particles Using Multitrack Displaced Vertices Or Displaced Lepton Pairs in [math Display

Many extensions of the Standard Model posit the existence of heavy particles with long lifetimes. This article presents the results of a search for events containing at least one long-lived particle that decays at a significant distance from its production point into two leptons or into five or more charged particles. In this study, this analysis uses a data sample of proton-proton collisions at \(\sqrt{s} = 8\) TeV corresponding to an integrated luminosity of 20.3 fb−1 collected in 2012 by the ATLAS detector operating at the Large Hadron Collider. No events are observed in any of the signal regions, and limits are set on model parameters within supersymmetric scenarios involving R-parity violation, split supersymmetry, and gauge mediation. In some of the search channels, the trigger and search strategy are based only on the decay products of individual long-lived particles, irrespective of the rest of the event. In these cases, the provided limits can easily be reinterpreted in different scenarios.