physics at international linear collider · a future linear collider should be realized through a...

3/4/2006 KEKPH06@KEK 1

Physics atInternational Linear Collider

KEKPH06 @ KEKMarch 2nd-4th, 2006

Tamaki Yoshioka ICEPP, Univ. of Tokyo

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Contents

- International Linear Collider (ILC) Project- Accelerator R&D Status- Detector R&D Status

- Physics at ILC- Higgs Physics- SUSY and Beyond Standard Model

- Summary

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Accelerator R&D Status

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Accelerator Timeline

2004. Aug. Technology Choice : Superconducting RF Technology2004. Nov. 1st ILC Workshop @ KEK 2005. May Establish Global Design Effort (GDE)2005. Aug. 2nd ILC Workshop @ Snowmass2005. Dec. Baseline Configuration Document (BCD)

2006. End Reference Design Report (RDR)

2008. End Detail Design, Site Selection

Current

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ICHEP 2004

At the Beijing ICHEP meeting in Aug. 2004, there was a general consensus that a future linear collider should be realized through a world-collaboration.

→ International Linear Collider (ILC) project

~1m

Recommendation by ITRP :We recommend that the Linear Collider is based on superconductingRF technology.

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Current

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1st ILC Workshop @ KEK

- In November 2004, more than 200 scientists and engineers from North America,Asia and Europe got together at KEK to facilitate the world-wide formation of aninternational design team of a linear collider.

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2004. Aug. Technology Choice : Superconducting RF Technology2004. Nov. 1st ILC Workshop @ KEK 2005. May Established Global Design Effort (GDE)2005. Aug. 2nd ILC Workshop @ Snowmass2005. Dec. Baseline Configuration Document (BCD)



Current

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Global Design Effort (GDE)Global Design Effort

Director : Barry Barish

Asian Regional TeamFumihiko Takasaki

European Regional TeamBrian Foster

American Regional TeamGerald Dugan

KEK, Japan

PAL, Korea

CHEP, Korea

CAT, India

TIFR, India

CERN, Europe

CCLRC, England

BINR, Russia

DESY, German

FNAL

BNL

LEPP

SLACICHEP, China

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Current

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- In August 2005, nearly 700 scientists and engineers from North America, Asia andEurope got together at Snowmass to advance the design of the ILC and its detectors.

Snowmass 2005

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Current

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Undulator based positron source

31.5 MeV/min Phase 1

36 MeV/mfor upgrade

2 Interaction Regions

7 km rings, 2 for e+/1 e-

Reference Design Report by the end of 2006

Baseline ConfigurationCenter-of-mass Energy

： 0.2~1.0 TeVLuminosity

: 2 x 1034cm-2s-1

Total Length: ~47km

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2006. End Reference Design Report (RDR) (including cost)


Current

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Detector R&D Status

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• SiD (American origin)– Silicon tracker, 5T field– SiW ECAL– 4 ‘coordinators’ (2 Americans, 1 Asian, 1 European)

• LDC (European origin)– TPC (+Silicon IT), 4T field– SiW ECAL (“medium” radius)– 6 ‘contact persons’: (2 Americans, 2 Asians, 2 Europeans)

• GLD (Asian origin)– TPC (+Large Silicon IT), 3T field– W/Scintillator ECAL (“large” radius)– 6 ‘contact persons’: (2 Americans, 2 Asians, 2 Europeans)

Major Detector Concept Studies

The parameters are the current defaults – may change.

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Major Detector Concept Studies

+ vertexing near IP

ECAL/HCAL inside coil

GLD is the largest amongthe three detectors, butcomparable size to CMS.

(America) (Europe) (Asia)

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(2005 end) Acc. Baseline Configuration Document (BCD)

Detector R&D report

(2006,2 end) “Detector outline documents”

(one for each detector concept)(2006 end) Acc. Reference Design Report (RDR)

Detector Concept Report (one document)

(~2008) LC site selection Collaborations form

~Site selection + 1yr Global lab selects experiments.

Accelerator Detector

Detector Timeline

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• Document that precedes DCR (detector concept report) of 2006 end.

• Contents (~100 pages total)– Introduction– Description of the concept– Expected performances for benchmark modes– Subsystem technology selections– Status of on-going studies– List of R&Ds needed– Costing– Conclusion

• Almost completed for GLD concept. Will be accessible via web site.

Detector Outline Document (DOD)

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Muon detectorCalorimeter

Tracker Vertexdetector

Coil

GLD Detector Performance Goals• Good jet energy resolution

• Efficient & High purity b/c tagging

• High momentum resolution

• Hermetic down to O(10) mrad

• Shield enough against beam-relatedbackground

)GeV(/%30/ EEE =σ

σip =5μm⊕10μm/psin3/2θ

σ(1/ p) = 5 ×10−5 /GeV

GLD detector

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• Many important physics modes have multi-jets : e.g.– Higgs self-coupling : 6 jets

– Top Yukawa coupling : 8 jets

– WW* branching fraction of Higgs : 4 jets+missing ν

• How to achieve for jet ?• Answer : Particle Flow Algorithm (PFA)

– Use trackers for charged particles– Use ECAL for photon– The rest is assumed to be neutral hadrons (ECAL+HCAL)

e+e− → Zhh → (qq )(qq )(qq )

σ E / E = 0.3/ E

e+e− → tt h → (bqq )(b qq )(qq )

e+e− → Zh → (qq )(qq )( ν )

Particle Flow Algorithm (PFA)

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GLD Detector Concept- To get good energy resolution by PFA, separation of particles (reducing the density of charged and neutral particles at CAL surface) is important.

R

d=0.15BR2/pt

22

2

MR

BR

+σ

Often quoted “Figure of Merit”

B : Magnetic fieldR : CAL inner radiusσ: CAL granularityRM : Effective Moliere length

- GLD concept1. Large inner radius of ECAL to optimize the PFA.2. Large tracker for excellent dpt/pt

2 and pattern recognition.3. Moderate B field (~3T).

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E%38~

PFA

Z-pole Energy Resolution

Simple way of PFA w/ GLD detector has already achieved < 40% resolution.→ GLD concept works.

E%41~

CAL Energy Sum

E%60~

• Z → qq @ 91.18GeV

Cheated PFA

E%27~

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Physics @ ILC

1st stage : Ecm=500GeV (91.2GeV, 200-500GeV changeable)Luminosity = > 500 / fb / several years

2nd stage : Ecm=1TeV

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Higgs Physics

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Higgs in Standard Model

114.4 GeV < MH < O(200) GeVHiggs mass is likely to be light

Precise measurements @ ILCHiggs mass, total width, spin, yukawa-coupling, self-coupling …

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• Diagrams of the Higgs production

• Production cross-section of the Higgs

>100k ZHFor 500fb-1

Higgs Production @ ILC

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ILC

50

50k

500k

Num

ber of signal events@500/fb

Cro

ss S

ectio

n σ

(fb)

Higgs Decay/Cross-Section

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Event Display• e+e-→Zh→ μ+μ-bb in the GLD detector

e+

e-

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Higgs Event Topology

2jets + 2leptons 4jets

2jets + missingThe Higgsstrahlung process can be classified according to its final state.

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Z

e+ /μ+

e−/μ−

XH

e+

e-

Z

Model Independent Higgs Search• 2lepton + X mode

• Identify lepton pair whoseinvariant mass is consistentwith the Z mass.

• Recoil massMh

2 = (pinit - pll)2

• Model independent,Higgs decay mode independentNo bias.

ZZ background

Signal

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e+e- → ZH → llX

MeV80M%9.2

h ==

δδσ

MeV109M%9.2

h ==

δδσ

MeV164M%9.2

h ==

δδσ

MeV27M%6.2

h ==

δδσ

• ECM=350GeV, Mh=120GeV, 500/fb, Background = ZZ• Different LC parameters

ISR only

highLum

Nominal

ECM = 250 GeV

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e+e- → Zh → ννbb or qqbb• ECM=350GeV, Mh=120GeV, 500/fb, Background = ZZ, WW, eνW• Different jet energy resolution (30%/√E, 40 %/√E)

MeV109M%6.3

h ==

δδσ

MeV88M%8.2

h ==

δδσ

MeV128M%7.3

h ==

δδσ

MeV104M%0.3

h ==

δδσ

2jet, 30%/√E

2jet, 40%/√E

4jet, 30%/√E

4jet, 40%/√E

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Total Width of Higgs

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Higgs Spin

Mh=120GeV20/fb/point

For J = 0, σ ∝ βFor J > 0, σ ∝ βk, k > 1

• From threshold scan,Higgs spin can be measured.

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Top-Yukawa Coupling• Signal

(37%) 6 (38%) 8

νljetsjetsHttee

+→→−+

ttee →−+

• Background

For 100/fb@700GeV, Δλ /λ ~ 0.14

e+

e-

t

t

H

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• Higgs potential = Origin of EW symmetry breaking

Higgs Self-Coupling

δλ/λ ~ 25~40%@500GeVδλ/λ ~ 10~15%@1TeV

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Higgs Couplings

ii vm κ×=particle mass

Higgs vacuume-expectation-value

Higgs coupling constant

in SM

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Heavy Higgs (H0,A0,H±) SearchILC

Discovery reach depends on tanβ and model.Good at large tanβ case.

Full discovery in many channels independentof tanβ. Reach up to ~ beam energy.

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Heavy Higgs Search• Photon-photon collider option at ILC

Laser

γ γe- beam e+ beam

H/A

γ

γ

• ILC 1TeV- Discovery mode for heavier Higgs

γγ → H/A - Discovery reach up to ~800 GeV

High energy photon beamby back compton scattering

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SUSY and Beyond

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ILC

LHC

SUSY Study @ ILC

• LHC would discover SUSY or missing-energy phenomena.

• SUSY Study @ ILCPrecise measurements of thesparticle properties can be done.

• ILC + LHCDetermine underlying SUSYmodel and SUSY breakingmechanism.

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SUSY Breaking Mechanisms

Different SUSY breaking mechanisms predict different mass spectra.

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• Missing Pt and θacop can be used.• Highly polarized electron beam is effective.

- Using right-handed electron beamSignal x 2, Background ~ 0

R

( )e e W W+ − + −→

Search

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01,R χ Mass

• Fit Eμ distribution → masses.01,R χ

slepton and neutralino mass canbe determined at ~1% level.

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Mass)~)(~(~~ 0

10

111 χχχχ −+−+−+ →→ WWee• process can be used.• Signal signature : 4-jet + Pt missing.• Fit Eμ distribution → mass

±1

~χ

±1

~χ

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GUT Related

• Relation of M1, M2, M3:Mass parameters of U(1),SU(2), SU(3) gaugino

- M1, M2 : ILC

- M3 : LHC

±1

~,~ χe

g~

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Large Extra Dimension

3/4/2006 KEKPH06@KEK 49n : number of extra dim.

Real Graviton Emission

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Indirect Search

G

f, V, H

f, V, H

e+e- → HH

• Reflects spin2 nature of KK graviton

• No SM backgrounds in HHchannel

• ~700 events detected @1TeV,500fb-1, if Ms=2TeV

N. Delerue, K. Fujii & N. Okada

Virtual Graviton Exchange

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Summary• International Linear Collider Project

- After the technology choice, there was significant progressin both accelerator and detector R&D.

- Baseline Configuration Document (BCD) and DetectorOutline Document (DOD) were prepared.

• Physics at ILC- Very high precision measurements for various physics.

- ILC 500GeV : Higgs Factory, Top quark Factory

- ILC 1TeV : Multi-Higgs, Top-Higgs,SUSY/Graviton Factory (?)

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End

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Backup Slides

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Baseline ConfigurationElectron Source

e-

e+

Center-of-mass Energy ： 0.2~1.0 TeV Luminosity : 2 x 1034cm-2s-1

Total Length : ~47km

Detector Cryomodule Damping Ring

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Production Angle of Higgs

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Higgs in MSSM• Two complex Higgs doublets → 8 degree of freedom

- 2 : Neutral, CP even = h, H- 1 : Neutral, CP odd = A - 2 : Charged = H±

- 3 : longitudinal polarization states of W/Z

→ 5 Higgs Bosons

• Masses of Higgs- Tree level : Mh < MZ- Higher order : Mh < ~140 GeV

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Higgs Couplings in MSSM

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Higgs Couplings in MSSM

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• WMAP data suggest dark matter.

0, ?χ τCandidate

Dark Matter

AllowedRegion

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Top Threshold Scan

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Top Momentum Distribution

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~2015Start Experiment

ILC Schedule

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