introduction to electroweak symmetry breaking

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1、INTRODUCTIONTOELECTROWEAKSYMMETRYBREAKINGS.DawsonPhysicsDepartment,BrookhavenNationalLaboratory,Upton,NY11973Anintroductiontothephysicsofelectroweaksymmetrybreakingisgiven.WediscussHiggsbosonproductionine+eandhadroniccollisionsandsurveysearchtechniquesatpresentandfutureaccelerators.Indir

2、ectlimitsontheHiggsbosonmassfromtrivialityarguments,vacuumstability,andprecisionelectroweakmea-surementsarepresented.AneectiveLagrangian,validwhenthereisnolowmassHiggsboson,isusedtodiscussthephysicsofastronglyinteractingelectroweaksymmetrybreakingsector.Finally,theHiggsbosonsoftheminimal

3、supersymmet-ricmodelareconsidered,alongwiththeresultingdierencesinphenomenologyfromtheStandardModel.1IntroductionThesearchfortheHiggsbosonhasbecomeamajorfocusofallparticleac-celerators.Inthesimplestversionoftheelectroweaktheory,theHiggsbosonservesbothtogivetheWandZbosonstheirmassesandtog

4、ivethefermionsmass.Itisthusavitalpartofthetheory.Intheselectures,wewillintroducetheHiggsbosonoftheStandardModelofelectroweakinteractions.1;2Section2containsaderivationoftheHiggsmechanism,withparticularattentiontothechoiceofgauge.InSection3wediscussindirectlimitsontheHiggsbosonmasscomingfr

5、omtheoreticalargumentsandfromprecisionmeasurementsattheLEPandLEP2colliders.TheproductionoftheStandardModelHiggsbosonisthensummarizedinSections4-8,beginningwithaarXiv:hep-ph/9901280v112Jan1999discussionoftheHiggsbosonbranchingratiosinSection4.Higgsproductionine+ecollisionsatLEPandLEP2andi

6、nhadroniccollisionsattheTevatronandtheLHCarediscussedinSections5and6,withanemphasisonthepotentialfordiscoveryinthedierentchannels.Section7containsaderivationoftheeectiveWapproximationandadiscussionofHiggsproductionthroughvectorbosonfusionattheLHC.ThepotentialforaHiggsbosondiscoveryatave

7、ryhighenergye+ecollider,p(s>500GeV)isdiscussedinSection8.SupposetheHiggsbosonisnotdiscoveredinane+ecolliderorattheLHC?DoesthismeantheStandardModelwithaHiggsbosonmustbeaban-doned?InSection9,wediscusstheimplicationsofaveryheavyHiggsboson,1(Mh>>800GeV).Inthisregimeth