Detector Requirements for ILC Experiments

1

Detector Requirementsfor

ILC ExperimentsAkiya Miyamoto

KEK

6 April 2005

素核研　研究計画委員会

Detector Performance Goals

Vertexing, b,c tags ... 1/5 rbeampipe,1/30 pixel size wrt LHC :

Tracking, tagged Higgs ... 1/6 material, 1/10 resolution wrt LHC :

Jet energy (quark recon.) W,Z separation... 1/2 resolution wrt LHC :

ip 5m10m / psin3 / 2

(1/ p) 5 10 5 /GeV

E /E 0.3/ E(GeV)

Hitoshi Yamamoto, Jan. 2005.

3Akiya Miyamoto, 　素核研研究計画委員会 (6-April-2005)

Contents

Introduction to ILC experiments Detector performance and physics

Jet energy measurement Vertex detector Tracker

Summary


Physics Scenario


Cross sections

5k events/4y

SM processes

Jets are copiously produced at ILC. Efficient detections of jets are crucial for physics involving W/Z/Top/H..

+ New physics


Jet fraction

Contents

h 93% bb(68%), WW*(15%), gg(7%), cc(3%) , … (Mh=120GeV)

W 68% cs(31%), …

Z 70% bb(15%), cc(12%), …

Top 100% bW(100%) [ 6jets(49%), 4jets+l(29%) ]

H0/A0/H+- bb, tb, Zh, …

w W/Z/h + LSP

Key feature of ILC events Many of our signals are jets.

~

W lis not usable for angular analysis for processes with >2W, LSP, etc Efficient detection of jet gains the statistics Provides a way to study new physics in quark sector ( model independent

study ) thanks to cleaner environment of ILC Increases power when combined with a vertex detector

b, c tag, and jet charge ID W/Z mass difference is ~ 10 GeV good detector system is crucial.

~


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

Shielded enough against beam-related background

Detector design Philosophy

Muon detector

Calorimeter

Tracker Vertexdetector

Coil


GLD tentative parametersSolenoid Magnet 3Tesla

Vertex Detector 6 layers, R=2.4(1.8)~6cm, 0.1%RL/layers, FPCCD(2D) point ~ 3m

Intermediate Tracker 4~5 layers of Si-Strip, R=9~37cmpoint ~ 10m

Central Tracker R=40 ~ 205cm, L~230cmMPGD-TPC, 200 Radial sampling,Two track separation ~ 2mmpoint < 150m

EM Calorimeter Rin = 2.1mW/Sci. 27X0, 38 sampling layersReadout: tile(4cmx4cm) and strip(1cmx20cm)

HD Calorimeter SS or Pb/Sci., 6, 130 sampling layers

Others ( Muon, Forward …) Optimization of detector parameters are now in progress.


Examples of basic physics capability

Model independent study of Higgs

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

Decay mode independent Higgs search

Studied using old “GLC” detector parameters.Expecting basically similar performance for GLD – needs to be confirmed.

Better performance meanes - smaller meas. error with same integrated Luminosity or - same meas. error with smaller integrated Luminosity


Error on Br(HWW*)

1

H

J.-C. Brient, LC-PHSM-2004-002

Error on ( *) from

measurement of

*

at 360 GeV, L=500 fb

M 120

BR H WW

e e ZH qqWW qqqql

s

GeV

Based on TESLA detector

2nd largest Br, if Mh~120GeV Combined with total(e+e-ZH), get H(Total width of H)

Br/Br~4.2%

Br/Br~4.8%


Mh in ZH4jet

jet

jet

42 MeV

E0.3

E

hM

jet

jet

46 MeV

E0.4

E

hM

jet

jet

48 MeV

E0.5

E

hM

jet

jet

50 MeV

E0.6

E

hM

Mbb (GeV) Mbb (GeV)

Mbb (GeV) Mbb (GeV)

1

350

500

s GeV

L fb

e e ZH

qqbb

Ej/Ej : 60% 30% Mh improves ~16%

In terms of Int. Lum.~30% less Acc. operation.

T.Barklow @LCWS2005


e+e- WW/ZZMain processes to study if Higgs sector is strongly interacting

WW ZZ

(@1TeV, fb) 17.2 6.5

No. of jet events (1ab-

1)7948 3165

Distribution: Sum of BreitWigner and Gauss of Gauss is /sqrt(E)No. of Events=xLxBr(W/Zqq’)

30% / E

M1qq(GeV) M1qq(GeV)

M2qq(G

eV

)

M2qq(G

eV

)

60% / E

Projectionto M1=M2

Hard to separateW/Z


SUSY study in jet mode 0 01 1

0 0 0 02 2 1 1

e e W W W W

e e ZZ

LSP+WW LSP+ZZ

(0.5TeV, fb) 20.1 1.8

No. of jet events (0.5ab-1)

4641 441

30% / E 60% / E

M1qq(GeV)

M2qq(G

eV

)

M1qq(GeV)

M2qq(G

eV

)

Hard to find Neurtalino

SUSY parameter: m0=500GeV, =400GeVM2=250GeV, tan=3


e+e- ZHH at 500 GeV

Main channel to study Higgs self-couplingTotal cross section ~ 0.2fb @ 500 GeV

2 2 212 34 56( ) ( ) ( )h h ZDIST M M M M M M

30% / E 60% / E

By Yasui

Analysis by TESLA DIST is used to separate signal from backgroundJet energy resolution is crucial to see signal


By T.Behnke(DESY), LCWS2005

10% / E

50% / E47 10 p


ILC Calorimeter

Jets in ILC detectors

Zoom

LEP ex. : ALEPHGLD

Dots are signal !


Example performance:TESLA TDR e+e- Z

33%~

E

E E

Analysis is based on Geant3 based TESLA detector simulator and reconstruction tools used for LEP studies.

30%/sqrt(E) is achievable

Remaining studies Improvements towards < 30%/sqrt(E) Other processes Other configuration: GLD/LDC/SiD Better simulation tools : Geant4 based

A Full Simulation Study

SNARK (DESY)

Tube along track transverse profile to further collect hits Neutral clustering (SNARK)

from LDC meeting @Paris, Jan, 2005

PFA Development Status – True vs Current PFAPFA Development Status – True vs Current PFA

True PFA (no confusion)

-> 28%/E

Current PFA Status

35%/E (conical showers)

70%/E (needs work!*)

* Improved with better neutral reconstruction

e+e- Z 2-jet

ANL/SLAC (Steve Magill)

Two component in reconstructedInvairant mass. Newutral Reconstruction is dificult

SiDTrack-Cell Association Photon finder Neutral Clustering


Mz resolution by Jupiter(GLD) Geant4 based simulation Perfect PFA. Reconstruction code is yet to be developed. Gap between naïve expectation and Geant4 simulation needs to be studied.

/ 28% /M M M

2( / )M GeV c

e+e- Z at 91GeV Preliminary result by Sumie Yamamoto


Vertexing


Vertex detector : Eff., Purity

ip 5m10m / psin3 / 2 Goal of ILC Vertex detector

3/ 28 33 / sinr m m p c.f. SLD VXD3

High performance allows usnot only b-tag, but also C-tag Vertex charge ID

e+e- Z0 case

Less light quark bkg.such as Hcc

TESLA TDR


Vertex detector : Challenge

But, ILC bunch structure: ~330 ns spacing, ~3000 bunch, 5Hz pulse Background : ~3hits in 100mx100m /pulse

We need to store signal near pixel during the pulse, or use very small pixel.

No proven technology satisfies these requirements

To achieve VTX performance goal,

Put VTX close to IP

Thin(~0.1%R.L./layer) structure

Increase # of layers : 3 5~6


Physics with Vertex detector High performance Vertex Detector allows us not only to tag b-bbar, but also

c-cbar tag Jet charge ID

These capabilities are very useful measure Higgs : Branching ratio to b-bbar, c-cbar Efficient and clean ID of b/c will help to reduce

combinatorial backgrounds in multi-jet events: e+e- tt, ttH, H+H-, … Backgrounds from other jet events: e+e- hh, …

Polarization analysis of top: t bW+, W+ c sbar: Probe of BSM Coupling asymmetries of Z0: Ab(0.94), Ac(0.67) cf. Al=0.15

Effects of large ED to e+e- bb/cc is stronger than e+e- ll channel. Charge IDs of jets from chargino/neutralino decay are indispensable for

analysis of angular correlations

For these channels, sensitivity extends to MD around 5 TeVFor muon pairs, effects are much weaker (not measurable even with

1 ab-1 of data)

Sabine Riemann: one example for large ED, sqrt(s) = 0.5 TeV

e e bb

e e cc

from C.Damarell, LCWS2005


Vertex tagging ex.

To achieve high efficient and high purity b/c tagging, good vertex detector is crucial

4layers 5layers

Br/Br(500fb-1) 25% 20%

Old results by G.B.Yu for Hc cbar meas., using MSTPM alone

Good VTX saves ~40% of running time!


Tracker


Higgs study in lepton mode

Higgs mass measurement by Z recoil method Model independent Higgs search mh~50MeV, ~3% possible in SM

Mh is very sensitive to loop effect in SUSY models: Lesser effects of beam related background Needs excellent tracker performance

1 22 42

~ ln( )t th t

t

m mm G m

m


H +-

Br(H +-)~0.023% if MH=120GeV ~50 events produced at 250GeV,1ab-1

Physics motivation: Yukawa coupling of 2nd generation Consider e +e - ZH jets + +-,

Simple S/N estimate by Breit Wigner + Gaussian Breit Wigner shape is expected background from e+e- ZZ

M(+-) (GeV)

Our target ALEPH1ab-1 @ 250 GeV

100% eff. assumed. Realistic simulation required

p/p2=5x10-5


分解能が足りないと…

日経サイエンス 1978 年 12 月号、 L.M 、レーダーマン著より

１９６８年以降　 BNL でデーター収集J/

Charm Threshold


Summary There are several processes which requires ultimate detector performances. In other processes, high performance gains statistics or precisions of measurem

ents. Equivalent to increase ILC luminosity Topics 　 not convered

Forward tracker/calorimeter Crucial for Luminosity meas. and dark matter search.

More quantitative and systematic study Study items towards Detector Outline document to be completed by Spring 2006.

“State of art” detector technology is a key to realize detector performance.

Documents

Detector Requirements for ILC Experiments