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LC Detector R&D, SLAC, and SLUO…pre-P5 meeting

R. Frey, University of Oregon

Detector R&D 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 R&D involving SLAC and users• SLAC as a center for LC R&D

The TeV Scale – What will it bring?

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H. Murayama

We know there is New Physics, but we don’t know what it is.

The LHC will uncover (choose):a)all the New Physicsb)a known portionc)an unknown portion

Jet (hadronic) final states at LHC

Z -> JJ , Mass Resolution

dE (Calor)

Fragmentation

Underlying Event

Radiation

B = 4 T

LHC Study: Z→ 2 jetsD. 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.

σM / M 13% without FSR

At the LC, the situation is reversed: Detection dominates.

Opportunity at the LC to significantly improve measurement of jets.

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LC environment: interaction rate; accelerator timing

• 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

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ILC(SC RF)

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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

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Meeting the challenges I: PFA for multi-jet final states

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Typical jet content:

2% at 100 GeV

+ confusion = 3-4% at 100 GeV

• This is >2x better than previous collider detectors• Key is minimizing confusion:1.Algorithms2.Calorimeter segmentation

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Steve Magill: PFA Illustration

t tbar 6 jets

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The SiD Si/W ECal

Layers tiled with silicon sensors, each with 1024 13 mm2 pixels

KPiX chip

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KPiX chip (SLAC, Oregon, BNL)

one channel of 1024

Si pixel

Dynamic gain select

Event trigger

Leakage current subtraction

calibration

Storage until end of train.

Pipeline depth presently is 4

13 bit A/D

Developed for Si/W ECal and Si strip Tracker.Being considered for GEM HCal, muon system, FCal.

(some) implications of excellent jet measurement

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

TESLA TDR

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

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

+ + (+o)

Meeting challenges II: tracking

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SiD vtx+tracker

Meeting challenges III: vertexing

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(some) implications of excellent tracking/vertexing

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Yamashita

Meeting challenges IV: L.E.P.

A Luminosity Spectrum dL/dE • Contributions

1. ISR2. Beamstrahlung3. Linac energy spread, E/E

• Need to measure dL/dE

“(Eo) + tail”

Broadening near Eo

e.g. t-tbar threshold

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University-SLAC detector R&D projects (incomplete)

Groups R&D activity

Annecy, UC Davis, Oregon (, BNL) Silicon/tungsten ECal

Brown, Michigan, New Mexico, Purdue, Santa Cruz, Tokyo, Washington (, FNAL)

Silicon tracking and vertexing

Colorado, Kansas, Kansas State, N. Illinois, Iowa, Oregon, Santa Cruz (, ANL, FNAL)

Simulations, Reconstruction, PFA development

Oregon Beam Energy measurement (synchrotron spectrometer)

Cambridge U., DESY, Dubna,Royal Holloway U., U. of Notre Dame, University College London, UC Berkeley

Beam Energy Measurement (BPM spectrometer)

Tufts Polarimeter backgrounds

(BNL,) Yale, Colorado, DESY Far-forward calorimeters

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SLAC test beam users for LC R&D(M. Woods)

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Groups Test Beam activity

Cambridge U., DESY, Dubna,Royal Holloway U., U. of Notre Dame, University College London, UC Berkeley, SLAC

Beam Energy Measurement (BPM spectrometer)

U. Oregon, SLAC Beam Energy Measurement (synchrotron spectrometer)

U. of Oxford, Rutherford Appleton Lab, U. of Essex, Dartmouth College, SLAC

Beam profile measurements (Smith-Purcell radiation)

Oregon, SLAC EMI effect on Vertex detectors

SLAC KPiX readout of Si strips

U. of Birmingham, CCLRC (UK), CERNManchester U., Lancaster U., DESY, TEMF TU Darmstadt, SLAC

Collimator wakefield studies

U. of Oxford, Daresbury Lab, SLAC IP BPM studies (FONT)

Why a SLAC Center for R&D?• 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

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