Prospects for tev scale new physics at lhc
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Prospects for TeV Scale New Physics at LHC. Reisaburo Tanaka (Okayama University) On behalf of ATLAS-Japan KEK Theory Meeting 2006 March 2-4, 2006. Large cross section via strong interaction Easy discovery M~1TeV within 1 month ?. SUSY Scale 20% accuracy ( L=10fb -1 , mSUGRA )

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Prospects for TeV Scale New Physics at LHC

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Prospects for tev scale new physics at lhc

Prospects for TeV ScaleNew Physics at LHC

Reisaburo Tanaka

(Okayama University)

On behalf of ATLAS-Japan

KEK Theory Meeting 2006

March 2-4, 2006


4 supersymmetry

Large cross section via strong interaction

Easy discovery M~1TeV within 1 month ?

SUSY Scale

20% accuracy(L=10fb-1, mSUGRA)

Missing ET is important (calibrate with Z→ll+jets)

Signal

4. Supersymmetry

Missing ET+ high pt jets + Leptons

(Model indep. Analysis, R-parity conserv.)

J.G. Branson et al., Eur.Phys.J.direct C4(2002)N1

Prospects for TeV Scale New Physics at LHC


Prospects for tev scale new physics at lhc

High PT leptons

+ multi-jets + b-jets

τ-jets

Gluino/squark are produced copiously,

“Cascade decay” follows after.

SUSY event topology

(Gravity- mediation + R-parity)

High

Stop,sbottom --->

ETmiss should be controlled in multi-jets topology (N>=4).

High Pt multi-jets are important to estimate SM background contributions and SUSY reconstruction.

Prospects for TeV Scale New Physics at LHC


Msugra discovery potential

1 month run (L=1fb-1)

〜1.5TeV 5 discovery

No EWSB

mSUGRA discovery potential

High Lum. 3 year run (L=300fb-1)

M2.5TeV

Cold Dark Matter

1 week run is enough.

WMAP 0.0094<Ωmh2<0.129

1 year run (L=10fb-1) M2TeV

LEP & Tevatron region

Prospects for TeV Scale New Physics at LHC


Me ps matching

ME-PS Matching

PS(Pythia)

1. Collinear and soft regions are covered with Parton Shower Pythia(6.2). Pt ordering is applied.

2. ME-PS matching is performed to remove double counts:

No-Shower branching probability is given by pQCD:Sudakov factorΔ:

Two major methods exist:

(A) CKKW: Events is reweight with Sudakov factor (product of Δ for all line)

(B) MLM: veto is applied after shower evolution

PS

Prospects for TeV Scale New Physics at LHC

F. Krauss et al., Phys.Rev.D70(2004)114009


No lepton mode one lepton mode

No lepton mode One Lepton mode

S.Asai et al., ATLAS Preliminary

Count /400GeV/10fb-1

Effective Mass(GeV) = mET + ΣPT(4jets)

(1) One lepton mode gives clean discovery.

(2) Top is dominant background.

(1) Background increases by factor 2-4 than the PS prediction depending on Meff.

(2) Slope becomes more gentle, and similar to the signal <-- important Point

Prospects for TeV Scale New Physics at LHC


Detector material

Tile barrel

Tile extended barrel

LAr hadronic

end-cap (HEC)

LAr EM end-cap (EMEC)

LAr EM barrel

LAr forward calorimeter (FCAL)

Lots of materials

Crack ||=1.4-1.6

Detector Material

ATLAS preliminary

T.Sasaki (U.Tokyo) et al.

Missing Ex resolution

 (GeV)

Crack +20% worse

All eta

∑Et (GeV)

Prospects for TeV Scale New Physics at LHC


Prospects for tev scale new physics at lhc

Bottomup Reconstruction

Sharp Edge

Mllmax

Mass Reconstruction

kinematical endpoint

B.C. Allanachet al.,JHEP 0009(2000)004

Generally under-constrained. Determine mass with help of models.

Can determine model independently if 2-body decay chain continues 3 times.

Large tanβ means more cascade and , b.

Strong model dependence.

Mass uncertainty mostly from LSP’s momentum.

Determination of spin or Br are difficult.

Prospects for TeV Scale New Physics at LHC


Synergy between lhc and ilc

Synergy between LHC and ILC

Universal Extra-Dimension scenario

Typical mSUGRA scenario

Use spin !

H-C.Cheng et al.,

Phys.Rev.D66(2002)036005, ibid. 056006

B.C.Allanach et al.,Eur.Phys.J.C25(2002)113

squark

LHC

Higgs

neutralino

chargino

slepton

ILC

LHC - Higgs, squark/gluino

ILC - Higgs, neutralino/chargino, slepton

Split supersymmetry: R-hadrons in ATLAS

A.C. Kraan et al., hep-ex/0511014

Prospects for TeV Scale New Physics at LHC


Testing the underlying theory

Testing the underlying theory

  • Determination of SUSY model parametres

    C.G. Lester, M.A. Parker, M.J. White, JHEP 0601(2006)080

  • SUSY “inverse map” LHC signatures  theoretical models

    N. Arkani-Hamed et al., hep-ph/0512190

Cross sections

Meff

Nlepton

Markov chain sampling technique

Kinematics

Endpoints(mass)

Inclusive

Signature

Exclusive

Signature

Easy for theory

1808 LHC observables

15 dimensional parametrization

Prospects for TeV Scale New Physics at LHC


7 summary

7. Summary

  • Discovery first !

  • LHC is capable to find new particles (SUSY, ED, Z’ etc. ) up to 2-3 TeV (up to ~10TeV with interference effect).

  • Model discrimination / parametre determination under study.

  • Experimental issues: commissioning/calibration

  • Needs to understand SM bkg from data and tuned MC.

  • Tools: t, b, W/Z and even Higgs!

  • We do hope major breakthrough in HEP (SUSY, ED etc.)

  • Important decision in 2010 about HEP’s future…

Prospects for TeV Scale New Physics at LHC


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