6533b872fe1ef96bd12d37ce
RESEARCH PRODUCT
The COMPASS trigger system for muon scattering
R. WindmoldersFrank KleinE. M. KabußM. LeberigA. BravarR. HermannJ. HannappelJ. ZhaoA. KorzenevD. V. HarrachJ. PretzC. BernetM. Ostricksubject
PhysicsNuclear and High Energy PhysicsParticle physicsLarge Hadron ColliderMuonPhotonPhysics::Instrumentation and DetectorsScatteringDeep inelastic scatteringNuclear physicsHodoscopeRadiative transferCOMPASS experimentHigh Energy Physics::ExperimentInstrumentationdescription
Abstract The trigger system of the COMPASS experiment at the CERN polarized muon beam is presented. It detects muon scattering events on (polarized) nucleons with a relative energy loss exceeding a selectable value y min independent of the four-momentum transfer. The requirement of a minimum energy deposit in a hadron calorimeter rejects background events like scattering on electrons, elastic and quasi-elastic radiative events as well as events from beam halo tracks. The trigger system which can be considered as a tagger for quasi-real photon events is now, along with larger trigger hodoscope system for deep inelastic scattering events, in regular use for the measurement of the gluon polarisation Δ G / G .
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-09-01 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |