在ilc对撞机上z0z0z0产生过程中的大额外维效应的分析

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1、ABSTRACTABSTRACTTheStandardModel(SM)providesanunifiedmathematicalframeworkforstrong，weak，andelectromagneticinteractions．Ithasobtainedenornlou$SUCCESSsinceitsbirth，asthecurrentpreciseexperimentaldatahavebeenshownanexcellentagreementwiththepredictionsoftheSM．Butitstillhasmanytheoreti

2、calproblems，such嬲thehierar-chyproblem,andthatthegravityhasnotbeeninvolvedintheframework．Therefore，peoplebelievethattheSMisnotafinaltheory,butonlyaneffectiveapproximationinlowenergyofamoreunderlyingtheory．InordertosolvethefundamentalproblemsintheSM，physicistsproposedmanynewtheoretic

3、almodelstoextendedtheSMindifferentways，suchastheMinimalSu-persymmetryStandardModel(MSSM)，theLargeExtraDimensionModel(LED)，theLittleHiggsModels(LH)，andtheTwoHiggsDoubletModel(THDM)．Amongthesenewmodels，theLargeExtraDimensionModelsolvesthehierarchyproblembyaddingnewextradimensionsbeyo

4、ndthe4space-timedimensions，whichisconsidered嬲alow-energyapproximationoftheStringtheory．BesidestheotherthreeinteractionsintheSM，thegravityisalsoinvolvedintheframeworkoftheLEDmodel．UnlikethecommonSMparticleswhichonlyexistin4dimensions，thegravitonsCanpropagateinallDdimensions．AndasArk

5、ani-Hamed，Dimopoulos，andDvaliproposed，thepictureeramasslessgravitonpropagatinginDdimensionsisequivalent谢tllthatofmassiveKaluza—Kleingravitonspropagatingin4dimensions，whichmakesitpossibletostudytheinteractionsbetweenthegravitonandcommonSMparticles．ThefutureInternationalLinearCollide

6、r(ILC)isdesignedasaTeVscalecollid-ermachineoperating谢廿1electron-positron，electron-photon,photon-photoncollidingmodes．Comparedwi也therunningLargeHardronCollider(LHC)，ILCexperimenthaSacleanerbackgroundandhigheraccuracy，whichprovideconvenientconditionsforthediscoveryofnewphysics．Inaddi

7、tion，ifsignalsofnewparticleswouldbeendis-coveredattheLHC，moreaccurateverificationsandinvestigationswillbetheimportanttasksoffutureexperiments．AslinearcollidercanmeaSRrethemassesandcouplingsofnewparticlesaccurately,itwillplayanimportantroleinthestudyofnewphysics．Searchingfornewphysi

8、csbeyondtheSMisanemphasiso