Soft displaced leptons at the LHC

• Verfasst von: Blekman, Freya [VerfasserIn]
• Verfasst von: Desai, Nishita [VerfasserIn]
• Verfasst von: Filimonova, Anastasiia [VerfasserIn]
• Verfasst von: Sahasransu, Abanti Ranadhir [VerfasserIn]
• Verfasst von: Westhoff, Susanne [VerfasserIn]
• Titel: Soft displaced leptons at the LHC
• Verf.angabe: Freya Blekman, Nishita Desai, Anastasiia Filimonova, Abanti Ranadhir Sahasransu and Susanne Westhoff
• E-Jahr: 2020
• Jahr: November 20, 2020
• Umfang: 26 S.
• Fussnoten: Gesehen am 14.01.2021
• Titel Quelle: Enthalten in: Journal of high energy physics
• Ort Quelle: Berlin : Springer, 1997
• Jahr Quelle: 2020
• Band/Heft Quelle: (2020,11) Artikel-Nummer 112, 26 Seiten
• ISSN Quelle: 1029-8479
• DOI: doi:10.1007/JHEP11(2020)112
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1744644616

Abstract

Soft displaced leptons are representative collider signatures of compressed dark sectors with feeble couplings to the standard model. Prime targets are dark matter scenarios where co-scattering or co-annihilation sets the relic abundance upon freeze-out. At the LHC, searches for soft displaced leptons are challenged by a large background from hadron or tau lepton decays. In this article, we present an analysis tailored for displaced leptons with a low transverse momentum threshold at 20 GeV. Using a neural network, we perform a comprehensive analysis of the event kinematics, including a study of the expected detection efficiencies and backgrounds at small momenta. Our results show that weak-scale particles decaying into soft leptons with decay lengths between 1 mm and 1 m can be probed with LHC Run 2 data. This motivates the need for dedicated triggers that maximize the sensitivity to displaced soft leptons.