randall sundrum modelparticle.korea.ac.kr/class/2012/phy713/knmin.pdf · 7396 200 0436 .08696 400...

Randall Sundrum Model

Kyungnam Min

1. Introduction

5D Einstein Equation and Randall Sundrum Setup

Planck Brane TeV Brane Our world

Assume…

Warped Factor

2. Calculation

2. Calculation

Neutrino Oscillation

3. Hierarchy

Exponential Hierarchy

4. BR

RS Branching Ratios

The branching ratios of the gluon decay is large…

but SM backgrounds are very large.

Many physicists are searching for the 2-leptons or 2-photons channels.

5. Decay mode

1. pp > G > l+l-

2. pp > G > ZZ(Z > l+l-, Z>2jets)

Background is… Z > l+l- (500000) ttbar (100000) WW (100000)

6. Cross section

The cross section of the RS model is small.

If the RS graviton is 1TeV, the cross section is ~ 0.6 fb^{-1}.

pp > G > l+l-

Pre-Selection 400,600,800,1000GeV

Backgrounds

Main background is Z>l+l-.

Signal and Background

Lepton PT and MET

•Lepton PT > 150GeV

•MET < 30GeV

The lepton PT of the signal is very energetic.

Delta Phi

Back to Back !

Lepton PT >150GeV

MET < 30GeV

Delta Phi > 2.8

1TeV Signal Event : 24.2

pp > G > ZZ > l+l-2jets

Z boson mass and Kkmass(1TeV)