Heather Russell
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Long-lived particle graphics

LLP overview

An overlay of all (maybe only most, this image is not kept up to date!) ATLAS and CMS LLP searches.

Disappearing track

Charged, long-lived particle decaying into a neutral particle and a light, undetectable meson.

Emerging jet

A shower of one or more flavours of long-lived particle, gradually decaying to detectable SM particles ("emerging").

Leptonic ID decays

A selection of signatures with LLPs leptonically decaying early enough such that inner detector tracks can be reconstructed.

Leptonic decays outside the ID

A selection of signatures with long-lived particles leptonically decaying outside of the inner tracking detectors.

Post-calorimeter hadronic decay

A long-lived particle that decays near the end of the hadronic calorimeters but before the middle of the muon spectrometer, leaving a shower of tracks in the muon spectrometer.

Collimated hadronic ID decay

A long-lived particle hadronically decaying in the inner detector, narrowly enough to leave only a single reconstructable jet in the calorimeters.

Non-collimated hadronic ID decay

A long-lived particle hadronically decaying in the inner detector, where the decay products are angularly well-separated enough to leave two reconstructable jets in the calorimeters.

Post-EM calorimeter hadronic decay

A long-lived particle hadronically decaying in or after the electromagnetic calorimeters, leaving a jet with a very non-characteristic electromagnetic fraction.

Other graphics

B→K*μμ decay

A slightly-displaced decay of a B-meson to a K* meson and two muons, where the K* subsequently decays to two charged pions that leave a small deposit of energy in the calorimeters.

Formation of jets (hadronization)

A sketch of how two jets might form from the production of a quark and an anti-quark.

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