introduction to electroweak symmetry breaking

《introduction to electroweak symmetry breaking》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

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

2、directlimitsontheHiggsbosonmassfromtrivialityarguments,vacuumstability,andprecisionelectroweakmea-surementsarepresented.AneectiveLagrangian,validwhenthereisnolowmassHiggsboson,isusedtodiscussthephysicsofastronglyinteractingelectroweaksymmetrybreakingsector.Finally,theHiggsbosonsofthem

3、inimalsupersymmet-ricmodelareconsidered,alongwiththeresultingdierencesinphenomenologyfromtheStandardModel.1IntroductionThesearchfortheHiggsbosonhasbecomeamajorfocusofallparticleac-celerators.Inthesimplestversionoftheelectroweaktheory,theHiggsbosonservesbothtogivetheWandZbosonstheirmas

4、sesandtogivethefermionsmass.Itisthusavitalpartofthetheory.Intheselectures,wewillintroducetheHiggsbosonoftheStandardModelofelectroweakinteractions.1;2Section2containsaderivationoftheHiggsmechanism,withparticularattentiontothechoiceofgauge.InSection3wediscussindirectlimitsontheHiggsboson

5、masscomingfromtheoreticalargumentsandfromprecisionmeasurementsattheLEPandLEP2colliders.TheproductionoftheStandardModelHiggsbosonisthensummarizedinSections4-8,beginningwithaarXiv:hep-ph/9901280v112Jan1999discussionoftheHiggsbosonbranchingratiosinSection4.Higgsproductionine+ecollisionsa

6、tLEPandLEP2andinhadroniccollisionsattheTevatronandtheLHCarediscussedinSections5and6,withanemphasisonthepotentialfordiscoveryinthedierentchannels.Section7containsaderivationoftheeectiveWapproximationandadiscussionofHiggsproductionthroughvectorbosonfusionattheLHC.ThepotentialforaHiggsb

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