小Higgs理論在eγ、ep對撞機上的可能物理跡象.pdf

1、遼寧師范大學碩士研究生學位論文論文題目：小Higgs理論在ey、印對撞機上的可能物理跡象研究生：張鳳指導教師：岳崇興教授學科專業(yè)：理論物理(粒子物理)年級：2003級遼寧師范大學研究生院2006年5月Abstract：Itiswellknownthatstandardmodel(SMldescribestheelementaryparticlesandtheirphenomenoninteractionperfectlyWecansay

2、thattheframeworkoftheSMisveryelegantSofartherehavebeenmanyexperimentaryfactsprovethatthecorrectnessoftheSMBut，theSMcanonlybeaneffectivefieldtheorybelowsomelli曲energyscale，therearestillmanydeficienciesinSMTheremaybenewphy

3、sicsbeyondtheSMLittleHiggetheoryisoneoftheimportantpromisingcandidatesofnewphysicsThelittlestHiggs(LH)modelhasbeenconstructedbasedontheideasofthelittleHiggstheorywhichpredictstheexistenceofnewheavygaugebosonsZH，BHandw吉an

4、dsomenewscalarparticlesTheseparticlesmightproducecharacteristicsignaturesatthepresentorfuturecoMderexperimentsInthispaper，westudythesignaturesofthesenewparticlesinthefuturehighenergylinearee—coMder(ILC)WefindthattheILCha

5、salargepotentialforthediscoveryofnewparticlesfirst，westudysingleproductionoftheSMgaugeboson町a(chǎn)ndtheheavygaugebosonⅣ二viapolarizede一7collisionsinthefralneworkoftheLHmodelWbfindthatthecorrectionsoftheLHmodeltothecrosssection

6、口(wf)mightbeobservedonlyforthescaleparameter，≤15TeVandthemixingparameterc’204inthefutureILCexperimentHowever，withasuitablychosenpolarizationoftheinitialelectronandpositionbeams，thepossiblesignalsoftheheavygaugeboson％canb

7、eeasilydetectedviae一1collisionsinthefutureILCexperimentwith、／S=3TeVandZ=500rb—1Second，westudysingleproductionofvectorliketopquarkviatheprocess印_e6“Tinthefuturelinacringtype印(THERA)colliderWefindthattheproductioncrosssect

8、ionisintherangeof12x103—048pbattheT日ERAwith、／S=37TeVthecrosssectionsofthesingleTproductionattheLHCandtheTHERAareatthes&rneorderofmagnitude，Thus，thepossiblesignalofthevectorliketopquarkTmightbedetectedinthefutureTHERAexpe

9、rimentsFinallywestudytheprocessofe1eHBecauseofthenon—decouplingprop—ertiesoftheHiggsboson。theeffectivecouplingsH77and日Z1aresensitivetothecontributionsofnewparticlesrunningintheloops，WefindthattheLHmodelCanproducesignific

10、antcorrectionstotheproductioncrosssectionoftheprocesse74eHinmostoftheparameterspaceallowedbytheelectroweakprecisiondataWithreasonablevaluesofthefreeparameterstheabsolutevalueoftherelativecorrectionparameter月islargerthan5

11、％whichmightbedetectedinthefutareILCexperimentsInaword，intheframeworkoftheLHmodel，wehavestudiedthesignaturesofthenewparticles，whichcanprovidetheoreticevidenceforthefuturedetectingthenewparticlesandtestingthecorrectnessoft