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Dilaton-induced dark matter and long-lived particle recasting

Abstract : Since the discovery of a scalar particle compatible with the Standard Model (SM) Higgs boson at the Large Hadron Collider (LHC) in 2012, no convincing signals of physics beyond the SM have been provided by the LHC, despite the various known shortcomings of the SM. To maximise the discovery and exclusion potential of the collider experiments, the full arsenal of possible search strategies should be exploited, including unconventional ones. Also other, non-collider experiments can provide valuable complementary input. One of the unresolved puzzles in particle physics is the nature of dark matter (DM). Within this work, an effective theory is considered, in which DM is coupled to the SM via the dilaton portal, which results from spontaneously broken scale invariance. The allowed model parameter space is probed trough a combination of constraints from collider searches, DM direct detection, the DM relic density and unitarity. The second part of this work focuses on collider signatures of long-lived particle (LLP) decays, in particular displaced tracks and vertices. Existing LLP searches performed by the ATLAS and CMS collaborations have been implemented in the recasting framework MadAnalysis 5, providing the possibility to re-interpret the search results in different signal models. One of these searches has been used to place constraints on a vector-like leptons model.
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https://theses.hal.science/tel-03727614
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Submitted on : Tuesday, July 19, 2022 - 2:18:54 PM
Last modification on : Tuesday, August 2, 2022 - 4:29:40 AM
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  • HAL Id : tel-03727614, version 1

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Manuel Utsch. Dilaton-induced dark matter and long-lived particle recasting. High Energy Physics - Phenomenology [hep-ph]. Sorbonne Université, 2021. English. ⟨NNT : 2021SORUS439⟩. ⟨tel-03727614⟩

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