Randall-Sundrum model with KK contribution Hirohisa Kubota KEK/SOKENDAI INTRODUCTION1 hierarchy problem Higss mass fine tuning? BSM(SUSY, extra dimension, technicolor… ) Randall-Sundrum(RS)model !? INTRODUCTION2 γγ-enhance 少し昔のお話・・・ CMS γγ-enhance BSMの痕跡? ATLAS INTRODUCTION2 γγ-enhance CMS ATLAS SMに収束してきた? INTRODUCTION3 CONSTRAINT Electroweak precision constraint Kaon-mixing constraint KK mass 3TeV KK mass 10TeV 未来に期待して3TeV・・・。 真面目に10TeVも考える・・・。 RS MODEL(ORIGINAL)1 3-brane 5次元理論(4+1次元)、余剰次元は S1/Z2(φ -φ)で小さくコンパクト化。 四次元は2つの3-brane(φ=0,π)で表現される garaviton 余剰次元には重力のみ伝播できて、 他のSM粒子は4次元(φ=π)に住む。 余剰次元の宇宙項Λ 新粒子 radion, KK graviton Set-up Lagrangian 5D planck Λ SM φ hidden visible RS MODEL(ORIGINAL)2 Assumed metric <0 AdS5 Einstein eq k:余剰次元の曲率, rc :余剰次元のサイズ warp factor effective four dimensional theory Mpl : 4D planck Mpl ~M 5次元のゆらぎ r(x) krc~10 massless radion 問題点 : krcは勝手にとっている・・・。 TeV Mpl Goldberger-Wise mechanism bulk scalar+3-brane interaction Stabilization potential+radion mass Set-up Lagrangian m : 5D scalar mass potential minimum ~10 Radion mass Lightest new particle ~ 数百GeV interaction (original RS) Radion wavefunction Effective theory r(x) : radion 1. Fermion and massive gauge boson higgs radion 2. Massless gauge boson Triangle loop+trace anomaly G=γ,g bG : β関数 Trace anomalyの寄与 Γ(r->gg)trace/Γ(r->gg) Γ(r->γγ)trace/Γ(r->γγ) Radion mass Radion mass Constraint Λr-mr σ/σSM r->ZZ at 5TeV ATLAS ZZ->4l ~5TeVまでは100~600GeVでexclude 低いmass領域は高いΛrにしないと生きてない Radion-higgs mixing Kinetic term > 0 Current base h,r Mass base hm , rm Radion-higgs mixing at 10TeV radion like Γ(rm ->ZZ)/Γ(hSM->ZZ) Radion mass Mixing ξ higgs like Γ(hm ->ZZ)/Γ(hSM->ZZ) at 125GeV Radion mass Mixing ξ Radion-higgs mixing at 10TeV radion like Γ(rm ->γγ)/Γ(hSM->γγ) Radion mass Mixing ξ higgs like Γ(hm ->γγ)/Γ(hSM->γγ) at 125GeV Radion mass Mixing ξ Radion-higgs mixing at 10TeV radion like Γ(rm ->gg)/Γ(hSM->gg) Radion mass Mixing ξ higgs like Γ(hm ->gg)/Γ(hSM->gg) at 125GeV Radion mass Mixing ξ σ×BR at 125GeV hm->γγ at 125GeV at 10TeV hm->ZZ,WW at 125GeV at 10 TeV Radion mass Radion mass hm->γγ at 125GeV at 3TeV hm->ZZ,WW at 125GeV at 10TeV Radion mass Radion mass Bulk RS model Originalとの違い • Fermionとgaugeがbulkに伝播している。 FermionとgaugeのKKも新粒子となる。 gauge garaviton higgs Fermion massの階層性を説明できる。 • Higgsはvisible braneに住む。 Gauge 階層性 • Higgs, radionのmass less gauge bosonとのcoupling LoopへのKKの寄与が考えられる。 Tree levelの寄与が現れる。 fermion Λ Kaluza-Klein reduction( 5D gauge boson) 5D gauge boson Lagrangian A5=0 Z2 odd 5D gauge field n=0 : SM n>0 : KK mode J, Y : bessel関数 5D wavefunction mn : KK mass Kaluza-Klein reduction( 5D gauge boson)2 From boundary condition at visible brane KK gauge wavefenction The lightest KK gauge mass Wavefunctionはvisible brane(φ=π)にlocalize higgsやradionとのcouplingが大きい higgs Kaluza-Klein reduction( 5D fermion) 5D fermion Lagrangian 5D fermon mass Y5D : 5D yukawa 5D fermion field Localize higgs(φ=π) Kaluza-Klein reduction( 5D fermion) 5D wavefunction SM KK WavefunctionのprofileはCL,Rに依存 TeV brane(φ=π) localize CL,R 大 Planck brane(φ=0) localize CL,R 小 The lightest KK gauge mass KK gaugeより少し重い higgs Hierarchy of yukawa 4D yukawa coupling n=0 : 4D SM yukawa 5D wavefunction Heavy fermion CL,R 大 higgs Light fermion CL,R 小 5D wavefunction profile Localize higgs(visible brane) 4D fermion mass interaction (bulk RS)1 Massive gauge boson higgs radion KKはh,r->γγでのloopに寄与する KK contribution interaction (bulk RS)2 fermion higgs radion KKはh,r->γγやgg->h,rに寄与する。 KK contribution interaction (bulk RS)3 Massless gauge bosom higgs FWKK, FfKK : KK triangle loop KK triangle loop FW, Ff : SM triangle loop interaction (bulk RS)3 radion Loop contribution Tree level contribution Trace anomaly term Bulk contribution r->γγ Bulk contribution r->gg Radion-higgs mixing with kk at 10TeV radion like Γ(rm ->γγ)/(hSM->γγ) Radion mass Mixing ξ higgs like Γ(hm ->γγ)/(hSM->γγ) at hm=125GeV Radion mass Mixing ξ Radion-higgs mixing with kk at 10TeV radion like Γ(rm ->gg)/Γ(hSM->gg) Radion mass Mixing ξ higgs like Γ(hm ->gg)/Γ(hSM->gg) hm=125GeV Radion mass Mixing ξ σ×BR at 125GeV hm->γγ at 125GeV at 10TeV Radion mass hm->ZZ,WW at 125GeV at 10TeV Radion mass hm->ZZ,WW at 125GeV at 10TeV Radion mass Radion mass σ×BR h->zz at 125GeV radion like Γ(rm ->ZZ)/Γ(hSM->ZZ) σ×BR h->γγ at 125GeV radion like Γ(rm ->ZZ)/Γ(hSM->ZZ) SUMMARY 1.SMに収束しつつあるが、高いscaleでも γγ-enhanceがある領域は存在する。 2.Mixingにより一般的に125GeV higgsの couplingは下がり、radionは上がる。 3.MixingとKKの寄与によりSMからsuppressさ れる領域も存在する。 Γ(r->gg)tracw/Γ(h->gg) at 10TeV Γ(r->gg)tracw/Γ(h->gg) at 3TeV Γ(r->γγ)tracw/Γ(h->gg) at 10TeV Γ(r->γγ)tracw/Γ(h->γγ) at 3TeV
© Copyright 2024