Abstract
Long-lived particles have become a new frontier in the exploration of physics beyond the Standard Model. In this paper, we present the implementation of four types of long-lived particle searches, viz. displaced leptons, disappearing track, displaced vertex with either muons or with missing transverse energy, and heavy charged tracks. These four categories cover the signatures of a large range of physics models. We illustrate their potential for exclusion and discuss their mutual overlaps in mass-lifetime space for two simple phenomenological models involving either a U(1)-charged or a coloured scalar.
Highlights
We present the implementation of four types of long-lived particle searches, viz. displaced leptons, disappearing track, displaced vertex with either muons or with missing transverse energy, and heavy charged tracks
A neutral particle decaying into quarks mostly in the electromagnetic or hadronic calorimeter will likely appear as a smaller, simultaneous signal in the displaced vertex and emerging jet searches
We present the implementation of a new class of analyses in the CheckMATE package, dedicated to longlived particle searches, which can be used to reinterpret experimental limits on new physics models
Summary
We offer a brief description of the implemented LLP searches and a comparison with experimentally published results. We find that the bounds agree within 20% of the cross-section value, with outliers at up to 50% discrepancy for small lifetimes This apparent success of the recast strategy with efficiencies applied on truth-level objects needs to be tempered as it seems to perform worse in the case of a compressed spectrum.
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