STAR的飛行時間探測器及相關(guān)物理

高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC1Introduction

Solenoidal

Tracker

At

RHIC

(STAR)高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC2Introduction

WhySTAR-TOF?Identifiedhadronspectrafreeze-outdynamicshadronizationmechanismIdentifiedparticlecorrelationsChemicalandkineticpropertiesofin-mediumjetassociatedspectraFluctuationsandcorrelationsLeptonprogramIn-mediumvectormesonpropertiesHeavyflavorBaselinedetectorforfutureupgrades

TPCdE/dx

forlowmomentumrange:

π/K0.6

GeV/cproton/meson1.0

GeV/cTOFwillextendmomentumrangeofPID!高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC3Introduction

STAR-TOFrequirementGoodoveralltimingresolution:<100psinAu+Aucollisions.Smalloccupancyperchannel:<10%.Ratecapability:200Hz/cm2.Highefficiency:>90%.FitintoCTB.SafeandnotimpairtheperformanceofotherSTARdetectors高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC4Introduction

STARTOFgroupModuleconstructionand

QABNL,LBL,MEPI,NASA,UNAM,RICE,UCLA,UT-Austin,U.Washington,YaleHuazhongNormalUniversity,IHEP(Beijing),IMP(Lanzhou),SINAP,Tsinghua,USTCElectronics,trayassembly,and

integration&ProjectsupportedbyDOE&NSFC高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC5PerformanceofSTAR-TOFprototypes

DesignofMulti-gapResistivePlateChamberforTOFrMRPCStripsize：3.15cm×6.30cmGasgap：6×0.22mmTechnologyFirstdevelopedbyALICE-TOFgroupE.Cerron

Zeballos

etal.Nucl.Instr.Meth.A374,132(1996)M.C.S.Williamsetal.Nucl.Instr.Meth.A478,183(2002)高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC6PerformanceofSTAR-TOFprototypes

TOFr1TrayConfiguration

Cover6

inazimuthand1inpseudo-rapidityatradius~2.2m高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC7PerformanceofSTAR-TOFprototypes

TrayLevel

TOF

Electronics(Final)J.Schambach，DOETOFReview高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC8PerformanceofSTAR-TOFprototypes

TOFr1TrayinSTAR高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC9PerformanceofSTAR-TOFprototypes

TOFStarter:

pseudo-Vertex

Position

Detector±5.4m,4.43<||<4.94,~19%(Butmajorupgradesince2006)200GeV/n_pairAu+Aud+Aup+pTriggerEfficiency100%30%10%t(ps)2585140高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC10PerformanceofSTAR-TOFprototypes

Achievementsfromtheprototype86psoveralltimingresolutionachievedin200GeVAu+Aucollisions.3.15cm

6.30cm,smallgranularity

Ratecapability:~300Hz/cm2(testbeam,CERN)Highefficiency:>95%WillbenefitfromorenhancetheperformanceofotherSTARdetectors高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC11PerformanceofSTAR-TOFprototypes

TimeresolutionsinRuns

OperationconditionsTimeResolution(ps)pVPDTOFr(overall)TOFr

(intrinsic)RunIII200GeVd+Au~85~120~85200GeVp+p~140~160~80RunIV62GeV(Au+Au)~55~105~89200GeV(Au+Au)FF/RFF~27~86(74)~82(70)HF~20~82(74)~80(71)RunV200GeVCuCu(ToT)~50~105(92)~92(75)62GeVCuCu(ToT)~82~125~94高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC12PerformanceofSTAR-TOFprototypes

Hadron/ElectronPIDcapabilityHadronPID:

(,K)~1.6GeV/cp~3GeV/c.

STARCollaboration,PLB616(2005)8|1/β-1|<0.03CleanelectronPIDcanbeobtaineduptoPT<3GeV/c.

Thishasbeenusedtomeasurethesemi-leptonicdecayofopencharm.

STARCollaboration,PRL94(2005)062301高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC13PerformanceofSTAR-TOFprototypes

MuonidentificationatlowpTeμπ0.15<pT<0.25GeV/c,DCA<3cmChenZHONG(SINAP)高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC14PerformanceofSTAR-TOFprototypes

ΦidentificationpowerSTARPreliminary

TOF+TPC:the2kaonsfromΦareidentifiedusingTOF&TPCrespectivelyTPC+TPC:the2kaonsfromΦareidentifiedusingonlyTPC高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC15PerformanceofSTAR-TOFprototypes

PIDbycombiningTOF+TPCTPCTOFalone,(,K)~1.6GeV/c,p~3GeV/c.

TOF+dE/dx+rdE/dx(,p)0.3~12GeV/c

M.Shaoetal.,NIMA558,(419)2006高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC16Physicsresultsachieved

Phys.Rev.Lett.97152301(2006)高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC17PhysicsresultsachievedIdentifiedbaryonandmesondistributionsatlargetransversemomentafromAu+Au

collisionsat200GeV,Phys.Rev.Lett.97152301(2006)PIDCroninEffectind+Au,Phys.Lett.B616(2005)8CharmCrosssectionandspectrainp+p,d+Au,Phys.Rev.Lett.94(2005)062301Alotofconferenceproceedings,QM04,SQM04,QM05,SQM06talks.TwoPh.Dtheses.9NIMApublications:

Nucl.Instrum.Meth.A478:176-179,2002(B.Bonneretal)Nucl.Instrum.Meth.A492:344-350,2002(SHaoMingetal)

Nucl.Instrum.Meth.A508:181-184,2003(B.Bonneretal)

Nucl.Instrum.Meth.A533:60-64,2004(F.Geurtsetal)

Nucl.Instrum.Meth.A537:698-702,2005(WangYietal)Nucl.Instrum.Meth.A538:243-248,2005(WuJianetal)

Nucl.Instrum.Meth.A538:425-430,2005(WangYietal)

Nucl.Instrum.Meth.A547:334-341,2005(ZhaoYaneetal)Nucl.Instrum.Meth.A558:419,2006(ShaoMingetal)MoretocomefromprototypeTOFr

ImaginewhatwecanaccomplishwithFullTOF(120trays)高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC18Physicsresultsexpected

PhysicswithFullBarrelTOF-IEventreductionfactor(achievingthesamesignalstatisticalsignificance)

ParticlepTrange(GeV/c)(TPC+TOF)/TPCK*00-12.0K*01-21.85K*02-31.74K*03-51.39f0-25.0f2-53.42Λ*0-1.611.4D00-54.6高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC19PhysicsresultsexpectedPhysicswithFullBarrelTOF-IITPC+TOF+SSD+HFT~200MCentralAuAuevents:22K

and6K

vectormesonpairsforoneyearRHICrunning高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC20Physicsresultsexpected

PhysicswithFullBarrelTOF-IIIMeasurementPhysicsGoalallparticlev2,

especiallyincreasingtheefficiencyformulti-strangeparticlev2

measurementFixthepartoniccollectivityparametersFluctuation/correlationstudieswithPIDUnderstandthenatureofpossiblephasetransitionAway-sidejetfragmentationyields,spectraSearchforeffectsofchiralandUA(1)symmetryrestorationYields,spectraofhigh-massresonancesMapoutmostoftheresonances(ifitisnotall)fromRHICUnlike-particle(e.g.,

-

)correlationsSpatialandtemporaldistributionsofhadronproductionCharmedhadronflowandyieldratiosCharmcollectivityandthermalizationoflightquarks(u,d,s)Heavyquarkjets;D,B-mesonspectraathighpTProbepartonicmediumandunderstandthenatureofpartoninteractions,i.e.partonenergylossInclusiveleptonanddi-leptonspectraandinvariantmassdistributionsStudypossiblein-mediummodificationofhadrons.e+e

pairproductioninUPCStrongfieldQEDeffectsLolongitudinalpolarizationcorrelationsCPviolationsearch高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC21Summaryandoutlook

Status&PlansStatusMRPCStandardproductionproceduresetupQualitycheckmeasurementsdefinedWebParameterDatabaseinstalled132MRPCssenttoUSalreadyfor4trayrun

高能物理大會廣西桂林2006.10.28－11.1J.WUUSTC22Summaryandoutlook

Status&plansProd