文档介绍：ChunhuiLuoInclusiveJ/ψProductionatDØ1APSMeetingApril5-8,2003atPhiladelphiaChunhuiLuoOutlineD0detectorelementscrucialfortheJ/ψcrosssectionmeasurementSummaryofRunIResults J/ψsignalinRunIICrossSectionDeterminationFuturePolarizationMeasurement AimsTestofQuantumChromodynamics(QCD)TestoftheDetectorperformance2APSMeetingApril5-8,2003atPhiladelphiaChunhuiLuoCalorimetersTrackerMuonSystemBeamlineShieldingElectronicsprotons20mantiprotonsTheRunIIDØDetector3APSMeetingApril5-8,2003atPhiladelphiaChunhuiLuoDØTracker125cm4APSMeetingApril5-8,missionedBottomB/CScintillatorsA-ScintPDTsForwardTracker(MDTs)ShieldingForwardTriggerScintillatorsCentralandForwardregions,coverageupto=±2Threelayers:oneinside(A),twooutside(B,C)sConsistsofscintillatorsanddrifttubesCentralProportionalDriftTubes(PDT’s)6624driftcells()in94three-andfour-deckchambersCentralScintillationCounters360“cosmicray”countersoutsidethetoroid(=)630“A”countersinside(=),=(MDT’s)60808-celltubesin8octantsperlayeronNorthandSouthside,cellcross-(Pixels)4214countersontheNorthandSouthside=matchestheMDTsectorsize5APSMeetingApril5-8,2003atPhiladelphiaChunhuiLuoMuonSystemPerformanceM==/invariantmassMatchingofcentraltracksto’simprovesmomentumresolutionCHEP02–31stInternationalConferenceonHighEnergyPhysics,Amsterdam,24–31July,20026APSMeetingApril5-8,2003atPhiladelphiaChunhuiLuoDØ’sFirstJ/Candidates~5pb-1J/vertexpT(track)>2GeV/c,matchedtoamuonPositivedecaylength7APSMeetingApril5-8,2003atPhiladelphiaChunhuiLuoRunIJ/ψproductioncrosssection8APSMeetingApril5-8,2003atPhiladelphiaChunhuiLuoσ(J/ψ)=N(J/ψ)eptεtriggerεrecoεtrack-matchL:-1εtrigger:di-:muonsystemonlyεtrack-match:muonsmatchedtocentraltrackεkine:ept:inactivematerial,-8,2003atPhiladelphiaChunhuiLuo~30%-1ofdat