J-PARC一般化ー分布研究(可能性)...

Nov.12,2007Shin'yaSawada@RCNP1HighMomentumBeamlineatJ-PARCShin’yaSawadaKEK(HighEnergyAcceleratorResearchOrganization,Japan)Nov.12,2007Shin'yaSawada@RCNP2IntroductionExamplesofExperiments–HighMassDimuon(unpol)–HighMassDimuon(pol):Goto-san–Phi:Yokkaichisan–…BeamlineOverviewandR&DNov.12,2007Shin'yaSawada@RCNP3SlowExtractionBeamline(Phase1)NP-HALL56m(L)×60m(W)50-GeVPST1Target30%LossBeamDump750kWSwitchYardA-LineT0Target0.5%LossSplitPoint2%LossPlantoextendthehalldownstream(~50m)inthePhase2.Nov.12,2007Shin'yaSawada@RCNP4BeamlinesattheHadronHallNov.12,2007Shin'yaSawada@RCNP5WhatistheHighMomentumBeamline?–Primarybeams:proton(Phase1),polarizedprotonandheavyions(future)upto51GeV/c.–Secondarybeams:proton,pion,kaon,etc.TheradiationshieldingoftheSYtunnelisdesignedsothat2%(15kW)lossallowedatSM1.Exp.setupcouldbestaged.~120mNov.12,2007Shin'yaSawada@RCNP6HadronPhysics•Drell-Yan,J/Psiproductionstructureatlargex•p,Kscattering•Hypernucleiformationviap,Kbeams•Vectormesonmodificationinmatter•ChiralperturbationtheoryviaKdecays•SpectroscopywithpandKbeamsNov.12,2007Shin'yaSawada@RCNP7PhysicsPossibilitiesoftheHighMomentumBeamlineHadronPhysics~PhysicsofQCDTwoMajorQuestsofQCD–quarkconfinementandchiralsymmetrybreakingSubjectsofHadronPhysics:attackingthesequestsfromvariousaspectsofview,atJ-PARC.–Hadronspectroscopy:spectroscopywithpi/K–Meson-baryondynamics:chiralperturbationviaKdecays,…–Quarknuclearmatter–Nuclearforce:pi/Kscattering,hypernuclearformationviapi/K–NucleonstructureExperimentstoexploremajorhadronphysicsquestsarepossibleatthehighmomentumbeamline!–vectormesonmodificationinmatterchiralsymmetryrestoration–Drell-YanandJ/PsiproductionnucleonstructureatlargexNov.12,2007Shin'yaSawada@RCNP8ExamplesofExperimentsHighMassDimuonMeasurement–~1012/sprotons–talkbyGoto-sanforthepol.partVectorMesonModificationinNuclei–~109-1010/sprotons–talkbyYokkaichi-sanOtherPossibilities–GPDwithppppiDelta?•talkbySudoh-sanattheAutumnJPSmeeting•“J-PARCにおける一般化パートン分布研究（の可能性）とクォーク軌道角運動量”–Vectormesoninsidenucleus•talkbyOzawa-san–Highmomentumkaon/pion??Nov.12,2007Shin'yaSawada@RCNP9P04:MeasurementofHigh-MassDimuonProductionatthe50-GeVProtonSynchrotronneeds30and50GeV,1012protonspersec.Nov.12,2007Shin'yaSawada@RCNP10PhysicswithHigh-MassDimuonsatJ-PARCDrell-Yan(at50GeV):/flavorasymmetryatlargeAntiquarkdistributionsinnucleiQuarkene/Production(at30or50GeV):/nucleardependrgySlossence/via/productioninnucleiduduJxJJpinphysicswithdimuons(mostlywithpolarizedbeam/target):Drell-Yanwithpolarizedbeam/target(Sea-quarkpolarizations,transversity,Siversfunction)/withpolarizedbeam/target(QuarkpJolarization,transversity,Siversfunction)UnpolarizedDrell-Yandecayangulardistributions(Boer-Mulder'sdistributionfunction)Nov.12,2007Shin'yaSawada@RCNP11DimuonSpectrometerforFNALE605/772/789/866p+p(d)→μ+μ-xat800GeV/cTwocomponentsintheμ+μ-spectrum:(a)Continuum:Drell-Yanprocess(b)Vectormesons:J/ψ,ΥFNALE866Nov.12,2007Shin'yaSawada@RCNP12/flavorasymmetryfromDrell-Yandu221Drell-Yan:/2(1()/())2pdppdxux22212121212..4()()()()9aaaaaaDYdeqxqxqxqxdxdxsxxp12:atxxpertubative,shouldgivesymmetric,guugddudNov.12,2007Shin'yaSawada@RCNP13/andatlargeusing50-GeVprotonbeamduux12121atfixed,DYdxxdxdxsDYcrosssectionis16timeslargerat50GeVthanat800GeV221250-cmlong/targets10protonsperspill(3s)60-dayrunsassuming50%efficiencforeachtyargetsLHLDD-Yat50GeValsodirectlymeasureatlargeppuxNov.12,2007Shin'yaSawada@RCNP14QuarkEnergyLosswithD-Yat50GeVFractionalenergylossislargerat50GeVPossibletotestthepredictedL2-dependencefromtheA-dependencemeasurementGarveyandPeng,PRL90(2003)092302Nov.12,2007Shin'yaSawada@RCNP15IssuesraisedbyPACRelationwithFermilabE906?50GeVprotonbeamisnotavailable.–ShojiNagamiyasaysthata50-GeVprotonmaybeavailablewithslowrampingevenwithoutaflying-wheelgenerator,accordingtoProf.Yamazaki,theleaderoftheJ-PARCacceleratorgroup.Whatisastage-1approval?Nov.12,2007Shin'yaSawada@RCNP16StatusofFermilabE906ApprovedbyFermilabPACin2001ReviewedbyFermilabPACagaininOctober2006,andthePACagainendorsedE906AtechnicalreviewofE906washeldatArgonneNationalLabinDecember2006InJune2007,USDOE/OfficeofNuclearPhysicsdecidedtofundE906–Constructionofthecoilsforanewmagnet–Construction/refurbishingthehodoscopesandtrackingchambers–ConstructionandinstallationwillbecompletedbyFallof2009E906isscheduledtorunfortwoyearsin2009-2011Equipmentswouldbecomeavailableinlate2011Nov.12,2007Shin'yaSawada@RCNP17TheoreticalConsiderationbyYokoya-san“QCDcorrectiontotheDrell-YanprocessatJ-PARCenergy”–H.Yokoya(Niigata)–第１回「J-PARCにおける高エネルギーハドロン物理」セミナー–８月２９日＠KEK50GeVのような「低エネルギー」においてDrell-Yan過程をQCDできちんと表せるのか？–pQCDからの「ずれ」をきちんと予測・コントロールできるか？SummarybyYokoya-san:Drell-YanprocessattheJ-PARCenergy,–QCDcorrectionisveryimportant,andhigher-ordercorrectionsbeyondNLOmayberequired.–Resummationstudiestellus,however,pQCDcorrectioncanbecontrolledbysummingthelargelogterms.–Power-correctionsmustbecomerelevant,andneedsmorestudies.–UnpolarizedPDFs(sea-quark,gluon)isstillunknown,andhavetobemeasuredattheJ-PARCexperiments.Nov.12,2007Shin'