Problem !HJH etal, TopSeesaw Composite Higgs mH = 400-500GeV0.6m.-△T limitsLVexcluded byM,= 24TeVdirect searchiLEP2direct limit0.66.30.495%CL0.468%C.L68%CL0.2X0.213X0A0.095% C.Lexcludedby-0.2triviality0.2Curves from left to right: x/k,=4,2, 1.2ImprovedRGApproach-0.40.401002003004005006000.63004000100200500600M, (GeV)TopSeesawModelmg [GeV]
Heavy Higgs vs Precision Data: No Problem ! HJH etal, TopSeesaw Composite Higgs mH ≈ 400-500GeV Top Seesaw Model
"Natural" SUSY requires heavier Higgs too !400TTTTTTTTTTIMSSMASUSYis already300)SU2'Fine-tuned200XBUlMuBarbieri et al, 1004.2256U1'100GevLLLL1010210310510610410710000108A(TeV)1000H,Ht,AExtended SUSYs give:Mn = 200-350 GeV100
“Natural” SUSY requires heavier Higgs too ! ’ ’ MSSM is already Fine-tuned ! Extended SUSYs give: Barbieri et al, 1004.2256
Fine-Tuning Problem :.Radiative Corrections to Higgs Mass:(200GeV)2 = M?。 + [-(2 TeV)2 + (520GeV)2 + (460GeV)2] 10TeV121loopstreemi2(2o0 GeV)higgstopgauge.Degree of Fine-Tuning (DFT):3 ^2M+2M+M2- 4M2MDFT =16 元2 v2
Fine-Tuning Problem ? ● Radiative Corrections to Higgs Mass: ● Degree of Fine-Tuning (DFT):
Fine-Tuning is a Technical Problem !14.5TeV141210TeV10M-=500GeV(AaL)87TeV6.5TeVL6200GeV43TeV=115GeV20.010.0500.040.020.060.080.1Degree of Fine-TuningNot strongenough for LHC (ILC) !
Fine-Tuning is a Technical Problem ! Not strong enough for LHC (ILC) ! 3TeV 6.5TeV 0.05 10TeV 0.01 7TeV 14.5TeV
Mysteries of Mass Origin:What can LHC probe ?0deuuSCT锅10-2eV10.001.01.1100GeVWZ(← %, g)Origin of Electroweak SymmetryBreaking-- Why are (W, Z) Massive but photon Massless ?Does t-Quark conspire Electroweak Symmetry Breaking:- Why is t-Quark Mass so Close to WiZ Masses?Why is Neutrino Mass so tiny? Seesaw Mechanism!
Mysteries of Mass Origin: What can LHC probe ? GeV ν 10-2 eV ◆ Origin of Electroweak Symmetry Breaking: - Why are (W, Z) Massive but photon Massless ? ◆ Does t-Quark conspire Electroweak Symmetry Breaking: - Why is t-Quark Mass so Close to W/Z Masses ? ◆ Why is Neutrino Mass so tiny ? → Seesaw Mechanism !