Luminosity

Luminosity is the collision rate per interaction probability in a particle collider. It measures how rapidly the collider can produce data for a given physical process.

Instantaneous luminosity: The collision rate per unit interaction probability at a particular moment in a collider. It tracks changing beam conditions during a run.
Event rate: The number of specified physical events occurring per unit time. Collider event rates follow from luminosity times the process cross section.
Particle accelerator: A machine that uses electromagnetic fields to increase the speed and energy of charged particles. A collider's luminosity is a performance measure of its accelerator beams.
Beam intensity: The number of particles in a beam or the rate at which particles pass a point. Intensity describes beam population, while luminosity also accounts for collision overlap.
Integrated luminosity: Instantaneous luminosity accumulated over a period, commonly measured in inverse barns. Its total determines the event sample available for analysis.
Large Hadron Collider: A CERN particle collider that accelerates protons and other ions to high energies. Its operating performance is commonly described through peak and integrated luminosity.
Particle beam: A directed stream of particles moving together through an accelerator or transport system. Luminosity depends on how many particles each colliding beam contains.
Beam brightness: A measure of particle density in phase space, combining beam intensity and emittance. Brightness characterizes beam quality rather than interaction probability per time.
Beam luminosity formula: A relation calculating collider luminosity from beam populations, collision frequency, and overlap geometry. It connects machine settings and beam shape to collision yield.
High-Luminosity Large Hadron Collider: An upgrade of the Large Hadron Collider designed to deliver substantially more collisions. The upgrade targets greater integrated luminosity for larger physics datasets.

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