In particle physics, a "jet" refers to a collimated spray of particles that is produced when a high-energy quark or gluon hadronizes, or transforms into a collection of particles, after being produced in high-energy collisions such as those occurring in particle accelerators (for example, at the Large Hadron Collider).
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A collimated collection of final hadrons associated with an energetic parton and its radiation and hadronization. A precise perturbative prediction requires an infrared-safe observable that specifies how particles are grouped into jets.