ILC Physics and Detectors

1

ILC Physics and Detectors

Akiya MiyamotoKEK

8-March-2005

APPI 2005

2A.Miyamoto , APPI2005 (8,-March-2005)

Contents

ILC overview Physics - Highlights Detector – Concept studies Summary


International Linear Collider ICFA Decision

ICFA chose Superconducting Technology at ICHEP04, Beijing following the recommendation of ITRP

ITRP recommended a technology, but not a design. The final design is expected to be developed by a team drawn from the combined warm and cold linear collider communities. GDI

GDI: Based on MOU among labs. for accelerator R&D and design Organization under ILCSC. Central team + 3 regional teams.


ILC Schedule

2004.8 Adopted ‘Cold’ at IHEP, Beijing2004.11 1st ILC workshop at KEK2005.2 Decide the director and location of Central GDI

2005. Establish Regional GDIs2005.8 2nd ILC workshop at Snowmass. Decide design outline

( acc. Gradient, 1/2 tunnel, dogbone/small DR, e+ generation, etc.)2005 end Complete CDR2007 end Complete TDR, role of regions, start site selection2008 Decide the site, budget approval2009 Ground breaking2014 Start commisioning

now


ILC Parameter

TESLA is the baseline design, but many alternatives under discussion Accelerating gradient : 35MeV/m or higher Number of tunnels: 1, 2 or 3 Damping ring: dog bone or single Positron production: undulator or conventional Crossing angle: 0 ~ 30mrad Number of Interaction Points : 1 or 2

Ecm: 1st phase 200 ~ 500 GeV, 2nd phase 1000 GeVLuminosity: ~2x1034/cm/s for >500fb-1 in 4 years

After Ecm upgrade, >1ab-1 in 4 years


Physics Opportunities at ILC

Electron/positron collision (elementary process) High Energy and High Luminosity

Energy scan (controllable) Controllable beam polarization Very sensitive detectors Trigger free Precise theoretical calculation (<1%)

Precise physics information & long energy reach

LHC gives us new single global mixed picture.ILC gives us new dynamic multi-dimensional total views.


Physics of EW symmetry breaking

Model independent study of Higgs

4-jet 2-jet+missing 2 lepton+X

Typical Higgs signal

>105 Higgsfor 500fb-1

ILC is a Higgs Factory!

Decay mode independent Higgs search


Studies of Higgs Properties

Energy scan

self coupling

VertexingTo tag b/c/


Beyond SM : SUSY

LHC would discover SUSY phenomena quickly, however Complicated cascade chain Large SM and other SUSY backgrounds Model dependence of new physics analyses

Non-colored SUSY particles is usually lighterthan colored SUSY particles ILC

ILC

LHC

Masses of neutralino and slepton are determined at O(0.1) GeV improves LHC’s SUSY mass meas.


Cosmology and LC

WMAP data suggest dark matter

0, ?


Beyond SM : Extra Dimension

Direct search

n = number of extra dimension

To be determined at ILC

Indirect search

G

f, V, H

f, V, H

e+e- HH

Reflects spin2 nature of KK graviton No SM backgrounds in HH channel ~700 events detected @1TeV, 500fb-1

if Ms=2TeV

N. Delerue, K. Fujii & N. OkadaOdagiri


Masses of top, Wsin2w new physics effect in loop

energy scan near thresholdtt

Precission Physics


Summary of ILC Physics


Detector for ILC experiments

Good jet energy resolution calorimeter inside a coil highly segmented calorimeter

Efficient & High purity b/c tagging Thin VTX, put close to the IP Strong solenoid field Pixel type

High momentum resolution

Hermetic down to O(10)mrad

Shiled enough against beam-related background

Detector design Philosophy

Muon detector

Calorimeter

Tracker Vertexdetector

Coil


“Super” detector Jets are copiously produced at ILC.

Efficient detections of jets are crucial for physics involving W/Z/Top/H..

and e e WW ZZ

/ ~0.6E E 0.3

2 jetM

Study H to VV coupling at H.E.

LEP like ILC target5k events/4y


Particle Flow Analysis

jet2 = ch

2 + 2 + nh

2 + confusion2 + threashold

2

Charged ~ 60% by tracker Gammas ~ 30% by EM cal Neutral Hadron ~10% by HD cal.

Separation of charged particle and /neutral hadron is important Separation : BL2/Rm ( if consider curvature by B)

L=Rin(Barrel) or Zin(End Cap), Rm=Effective Moliere length

B=0

E(Energy stored in Coil)~ B2L3

thereforeseparation E L

2Cal.cost LBut

If same cal. Segmentationis used


Vertex tagging

To achieve high efficient and high purity b/c tagging, good vertex detector is crucial put Vertex detector as close as possible


Vertex detector issues

Compared to 4T case, pair background hit at R= 15mm becomes x1.7 larger in 3T

At larger R, the background hit would decrease significantly

The configuration of R=20 mm with Si thickness < 70 m and 500 m thick beam pipe at R=12 mm still satisfies the requirement of

　　　　　　　　 b=5 10/(psin3/2) m

R (mm)

B (T) Pair Background (hit/mm2/train)

15 4 1.0

15 3 1.7

24 3 0.4

TRC500 beam parameters

# of fired pixels ~ 5.0 pixels/hit

Inner radius should be optimized based on physics performance using ILC parameter


Detector concepts

B 5TREM 1.27m5 layers Si trackerW+Si Cal.EM seg. 0.5x0.5cm2

B 4TREM 1.68mTPCW+Si Cal.

B 3TREM 2.10mTPCW+Scinti. Cal.EM seg. 2x2cm2 or strip

All these parameters are subject to change

SiD LCD “GLD”


WWS

WWS(World Wide Study for Linear Collider Physics and Detector) A committee for LC physics and Detectors under ILCSC.

( note : GDI/GDO is only for accelerator issues. ) 3 Co-chairs from each region + 5~6 members from each region Tasks

Organize LCWS seriese. 2005 at SLAC, 2006 at India Promote experimental program until Global Lab. takes over its role.

Feb. 2004, ILCSC asked the Worldwide Study to develop a plan for organizing the experimental program in parallel with the GDI for the machine. WWS will organize: R&D panel, MDI panel, detector costing panel WWS will request each concept teams to write “Detector Outlines”,

which will be inputs for R&D panel.


Organization chart

IUPAP

ICFA(J.Dorfan)

GDIPhys.&Det. Sub-Com(J.Brau, H.Yamamoto,

D.Miller)

ILCSC(M.Tigner)

3 regional steering com.

( Asia, N.A., Europe)

Wold Wide Study

AsianLCSC

ACFAPhys.&Det. WG

R&D panelCosting panel

MDIpanel


Time line of Experimental program

GDI (Design) 　 (Construction)

TechnologyChoice

Acc.

2004 2005 2006 2007 2008 2009 2010

CDR TDR Start Global Lab.

Det. Detector Outline Documents

CDRs LOIs

R&D PhaseCollaboration Forming 　 Construction

WWSDetector R&D Panel

TevatronSLAC B

LHCHERA

T2K

TDRs


Summary

Aims of the energy frontier experiment at ILC are To unveil physics of EW symmetry breaking and to understand

the structure of vacuum which is filled by Higgs To unveil new physics and establish new principle

SUSY, … Extra dimension ….

After ITRP decision last year, Accelerator activity is united and moving very fast

towards CDR, TDR, … A program to set up experimental program has been set

up and LC community is moving along that direction. Many events/decisions concerning ILC is expected this

year. LCWS2005(3/18-23, SLAC), 8th ACFA(7/11-14),

Snowmass(mid. Aug), LCWS2006(Feb/Mar, 2006)


Backup slides

GDI: First stage of GDO


Merit of Huge Detector

Good Jet Energy (Particle) Flow Measurement Good charged track separation in a jet at the inner surface of the calorimeter

large BR2

Pattern recognition is easier 　 large n with thin material,

small number of low momentum curling tracks Good momentum resolution for charged particles large BR2 √n

Good dE/dx measurement for charged particles large n

Smaller relative volume of the dead space small ΔV/V 　　　 for constant ΔV

Good two track separation, Larger efficiency for Ks and Λ (any long lived) large BR2 , larger R