LC Detector R

1
LC Detector RD, SLAC, and SLUOpre-P5 meeting
R. Frey, University of Oregon

• Detector RD will have a huge positive impact on
  the physics program of the TeV-scale LC.
• We see how to make big steps in performance over
  the LEP/SLC generation of detectors. And there is
  additional untapped potential.
• These steps will possibly be crucial for
  elucidating the New Physics.
• Major labs and their users should play a
  meaningful role.
• Outline
• The LC challenges for detectors
• Snapshots of some current RD involving SLAC and
  users
• SLAC as a center for LC RD

2
The TeV Scale What will it bring?
H. Murayama
We know there is New Physics, but we dont know
what it is.

• The LHC will uncover (choose)
• all the New Physics
• a known portion
• an unknown portion

3
Jet (hadronic) final states at LHC
LHC Study Z? 2 jets
D. Green, Calor2002

• FSR is the biggest effect.
• The underlying event is the second largest error
  (if cone R 0.7).
• Calorimeter resolution is a minor effect.

sM / M ? 13 without FSR

• At the LC, the situation is reversed Detection
  dominates.
• Opportunity at the LC to significantly improve
  measurement of jets.

4
LC environment interaction rate accelerator
timing
ILC (SC RF)

• Cross section is small ? 0 or 1 event per bunch
  crossing
• No underlying events (pairs swept forward)
• Little or no radiation damage
• All events are interesting ? no trigger (record
  everything)
• Long time between bunch trains ? turn off (most)
  power in FE
• Can use passive cooling ? very light tracking
  systems
• Small IP ? can get very close with vertex
  detectors

5
LC detector goals

• In general, LC measurements are limited by the
  detectors (and luminosity, ?s), not by the
  collider environment.
• LC detectors should aim to measure all final
  states and measure with precision.
• Multi-jet final states
• With or without beam constraint
• Leptons
• including tau
• Heavy quarks
• Missing energy/mass
• Collision energy and polarization

6
Meeting the challenges I PFA for multi-jet final
states
?2 at 100 GeV
confusion 3-4 at 100 GeV

• This is gt2x better than previous collider
  detectors
• Key is minimizing confusion
• Algorithms
• Calorimeter segmentation

7
Steve Magill PFA Illustration t tbar ? 6 jets
8
The SiD Si/W ECal
Layers tiled with silicon sensors, each with 1024
13 mm2 pixels
KPiX chip
9
KPiX chip (SLAC, Oregon, BNL) one channel of 1024
Dynamic gain select
13 bit A/D
Si pixel
Storage until end of train. Pipeline depth
presently is 4
Leakage current subtraction
Event trigger
calibration
Developed for Si/W ECal and Si strip
Tracker. Being considered for GEM HCal, muon
system, FCal.
10
(some) implications of excellent jet measurement
TESLA TDR

• multi-jet masses in the absence of beam
  constraints,
• e.g. ??WW vs ??ZZ, W/Z ? jets

• reducing combinations with intermediate jet
  masses,
• e.g. ZHH ? jets

? ? ?? ?(??o?) ?

• segmented, imaging calorimeters open up new
  measurements,
• e.g. tau id and polarization
• non-pointing photons (GMSB)

11
Meeting challenges II tracking
SiD vtxtracker
12
Meeting challenges III vertexing
13
(some) implications of excellent
tracking/vertexing
Yamashita
14
Meeting challenges IV L.E.P.
e.g. t-tbar threshold

• A Luminosity Spectrum dL/dE
• Contributions
• ISR
• Beamstrahlung
• Linac energy spread, ?E/E
• Need to measure dL/dE

?(Eo) tail
Broadening near Eo
15
University-SLAC detector RD projects (incomplete)
16
SLAC test beam users for LC RD(M. Woods)
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Why a SLAC Center for RD?

• It already is at some level SLAC-based activity
  should increase with the U.S. LC effort.
• The presence of a LC on site!!
• Unique national/international capability
• Detector test beams
• Accelerator instrumentation test beams
• The test beams are great (several personal
  experiences)
• Well-defined position, time, and energy
• With a LC bunch timing structure(!)
• Local detector/instrumentation expertise and
  infrastructure
• Electronics group
• HEP-related engineering
• Detector experts
• Computing facilities and simulation/software
  group
• Location
• Historical user base