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1、DecayH+→W+γinanonlinearR-gaugeξJ.Hern´andez-S´anchez,1M.A.P´erez,2G.Tavares-Velasco,3andJ.J.Toscano31CentrodeInvestigaci´onAvanzadaenIngenier´ıaIndustrial,UniversidadAut´onomadelEstadodeHidalgo,C.P.42184,Pachuca,Hidalgo,M´exico2DepartamentodeF´isica,CINVEST
2、AV,ApartadoPostal14-740,07000,M´exico,D.F.,M´exico3FacultaddeCienciasF´isicoMatem´aticas,Benem´eritaUniversidadAut´onomadePuebla,ApartadoPostal1152,Puebla,Pue.,M´exico(Dated:February1,2008)++AnewevaluationofthechargedHiggsbosondecayH→Wγispresentedintheconte
3、xtofthegeneraltwo-Higgsdoubletmodel.AnonlinearRξ-gaugewhichconsiderablysimplifiesthecalculationisintroducedandsimpleexpressionsareobtainedforthefermionicandbosoniccontributions.The++H→Wγbranchingratioisanalyzedforseveralvaluesoftheparametersofthemodel.Althou
4、gh−4thisdecaycanhaveabranchingfractionaslargeas10inacertainregionoftheparameterspace,itisfoundthatsucharegionisdisfavoredbythemostrecentconstraintsonb→sγ,g−2ofthemuon,Z→b¯b,andtheρparameter,alongwiththeexclusionsfromdirectsearchesattheCERN−+eeLEPcollider.Th
5、epossibilityofdetectingthisdecayatfuturecollidersisdiscussed.PACSnumbers:12.60.Fr,14.80.CpI.INTRODUCTIONOneofthemostpopularextensionsofthestandardmodel(SM)isthetwo-Higgsdoubletmodel(THDM),mainlybecauseofitssimplicityandconsistencywiththeminimalrealizationof
6、supersymmetry(SUSY)[1].TheTHDMpredictstheexistenceoffiveHiggsbosons:twoneutralCP-evenscalarbosonsh0andH0,oneneutralCP-oddscalarbosonA0,andapairofchargedscalarbosonsH±[1].ThedetectionofthechargedHiggsbosonwouldbeanirrefutablesignalofanextendedHiggssector,andi
7、tsexperimentalstudymighthelpustoelucidatethestructureoftheHiggspotentialandshedlightonthegrouprepresentationoftheHiggsfieldsthroughthestudyofitscouplingstothegaugebosonfields.InmodelswhichonlycomprisesingletsanddoubletsofHiggsbosons,thedecaysofthechargedscala
8、rbosonintoagaugebosonpair,namelyH+→W+γ[2,3,4]andH+→W+Z[5,6],areabsentatthetreelevel,thoughtheymayoccurathigherorders.WhilethedecaymodeH+→W+γisforbiddenatthetreelevelduetoelectromagneticgaugeinvariance,
