October 31, 2022 to November 4, 2022
CERN
Europe/Zurich timezone

ATLAS Runs 2 and 3 Displaced Leptons Search

Not scheduled
20m
CERN

CERN

Speaker

Andrew Caldon Smith (Columbia University (US))

Description

Using ATLAS data from LHC Runs 2 and 3, we propose a search sensitive to pair-production of long-lived sleptons, resulting in final state pairs of displaced and delayed light leptons (e-e, e-$\mu$, and $\mu$-$\mu$). The ATLAS Run 3 trigger menu includes novel displaced electron and muon triggers based on Large Radius Tracking (LRT), a special tracking pass dedicated to displaced tracks, which increases sensitivity to objects with large impact parameters. These triggers will allow us to probe models with a softer transverse momentum spectrum than the ATLAS Run 2 search [PRL 127, 051802, 2021]. The slepton lifetime results in a delay in lepton flight time to the outer detector with respect to prompt leptons. We therefore propose a new analysis strategy, which exploits the timing resolution of the ATLAS detector as a discriminant to deal with higher backgrounds in the newly accessible kinematic regime. The use of timing information and the Run 3 displaced lepton triggers will give broad new sensitivity to a key LLP signature.

Primary author

Andrew Caldon Smith (Columbia University (US))

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