detector requirements for ilc experiments
DESCRIPTION
Detector Requirements for ILC Experiments. Akiya Miyamoto KEK. 6 April 2005. 素核研 研究計画委員会. Hitoshi Yamamoto, Jan. 2005. Detector Performance Goals. Vertexing, b,c tags ... 1/5 r beampipe ,1/30 pixel size wrt LHC : Tracking, tagged Higgs ... 1/6 material, 1/10 resolution wrt LHC : - PowerPoint PPT PresentationTRANSCRIPT
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1
Detector Requirementsfor
ILC ExperimentsAkiya Miyamoto
KEK
6 April 2005
素核研 研究計画委員会
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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.
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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
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4Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
Physics Scenario
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5Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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
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6Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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.
~
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7Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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
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8Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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.
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9Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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
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10Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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%
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11Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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
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12Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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
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13Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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
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14Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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
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15Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
By T.Behnke(DESY), LCWS2005
10% / E
50% / E47 10 p
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16Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
ILC Calorimeter
Jets in ILC detectors
Zoom
LEP ex. : ALEPHGLD
Dots are signal !
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17Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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
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SNARK (DESY)
Tube along track transverse profile to further collect hits Neutral clustering (SNARK)
from LDC meeting @Paris, Jan, 2005
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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
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20Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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
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21Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
Vertexing
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22Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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
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23Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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
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24Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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
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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
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26Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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!
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27Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
Tracker
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28Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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
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29Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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
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30Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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
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31Akiya Miyamoto, 素核研研究計画委員会 (6-April-2005)
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.