Search results for "PSI-PSI-PRODUCTION"

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Observation and studies of double J/psi production at the Tevatron

2014

We present the observation of doubly-produced $J/\psi$ mesons with the D0 detector at Fermilab in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV. The production cross section for both singly and doubly-produced $J/\psi$ mesons is measured using a sample with an integrated luminosity of 8.1fb$^{-1}$. For the first time, the double $J/\psi$ production cross section is separated into contributions due to single and double parton scatterings. Using these measurements, we determine the effective cross section $\sigma_{eff}$, a parameter characterizing an effective spatial area of the parton-parton interactions and related to the parton spatial density inside the nucleon.

Nuclear and High Energy PhysicsParticle physicsMesonDOUBLE-PARTON SCATTERINGP(P)OVER-BAR COLLISIONSTevatronFOS: Physical sciencesPartonPSI-PSI-PRODUCTIONAstronomy & Astrophysics7. Clean energy01 natural sciencesHigh Energy Physics - ExperimentPhysics Particles & FieldsNuclear physicsHigh Energy Physics - Experiment (hep-ex)Cross section (physics)0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Fermilab010306 general physicsNuclear ExperimentRUN-IIPhysicsLuminosity (scattering theory)Science & TechnologyPP COLLISIONS010308 nuclear & particles physicshep-exPhysicsHigh Energy Physics::PhenomenologyExperimental High Energy PhysicsPhysical SciencesComputingMethodologies_DOCUMENTANDTEXTPROCESSINGProduction (computer science)High Energy Physics::ExperimentNucleon
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