sid a linear collider detector slac users organization annual meeting september 17, 2009 john jaros
Post on 20-Dec-2015
220 views
TRANSCRIPT
SiD
A Linear Collider Detector
SLAC Users Organization Annual Meeting September 17, 2009
John Jaros
LC Physics Case is Compelling as EverWe expect LHC to discover New Physics at the Terascale
Understanding the new discoveries will require the Linear Collider• Detailed and precise measurements are needed to understand the
mechanism of Electroweak Symmetry Breaking• Precision measurements of dark matter properties are required
to infer its role in cosmology• Precision measurements of SM processes will open windows
to higher energy scales
LoIs Have Advanced the LC Detector Case“Letters of Intent” were submitted for international review and
“validation” in March of 2009 by ILD, SiD, and 4th (detector concept groups)
• Register intent to develop and detail a design for an ILC detector, and to proceed with preparing a Technical Report in 2012 to accompany the ILC’s Technical Design for the machine
• Provide a full detector description, sub-detector status, and a discussion of machine-detector integration.
• Evaluate the performance of the proposed detector with full Monte Carlo simulation, including beam backgrounds
Both ILD and SiD have been “Validated” by the International Detector Advisory Group.
SiD Letter of Intent was submitted 31 March, 2009 and signed by 244 physicists and engineers, representing 77 institutions, worldwide
The SiD LoI and other information about SiD can be found on the SiD webpage:http://silicondetector.org/display/SiD/home
The LoI’s have accelerated progressin answering key questions
• Are the proposed designs feasible? Are they within reach technologically?
• Do the proposed designs make engineering sense? Are they buildable, supportable, alignable, and calibratable?Are machine and detector believably integrated?
• Can realistic detectors, in full simulation and accounting forbeam backgrounds, do justice to ILC physics?
• Jet energy resolution goal is E/E=3-4% to distinguish hadronic decays of W’s and Z’s, identify Higgs and Top, and measure W/Z energies precisely
• Excellent charged particle momentum resolution pt/pt2 ≤ 5 x 10-5 GeV-1
to identify Higgs in recoil and measure SUSY endpoint spectra precisely
• VX Tracker with impact parameter resolution = 5 10/psin3/2 [m]to measure Higgs Branching Fractions to bottom, charm, and gluons, and tag quark charge.
• Full solid angle coverage to capture multi-jet final states; hermetic calorimetry to utilize missing energy signals from SUSY
• Tolerance for intense backgrounds from beamstrahlung, gamma-gamma backgrounds, and sporadic showers from errant beams
Precision LC Physics Requires High Performance Detectors
Silicon Detector
VTX 5 layer Si pixels Barrel and Endcap
TRK 5 layer Si strip Barrel and Endcap
ECAL 30 layers Si/W 3.5 x 3.5 mm2 pixels
HCAL 40 layers RPC/Fe 4.5 1 x 1 cm2 cells
MAGNET 5T SC Solenoid
MUON 11x 20cm Fe layers RPC ~ 2 cm
Technical Feasibility: Low Mass Tracker
Sensor Modules tile lightweight CF+Rohrcell cylinders Prototype Hamamatsu Sensoris read out by two KPiX ASICS(2 x 1024 channels)
Power pulsing permits air cooling,minimizing tracker mass. X/Xo ~ 10-15 %
Si Provides Superb Momentum Resolution
p/p = 0.2%
Technical Feasibility: EcalConceptual engineering design for Si/W Ecal
Hamamatsu Sensors and KPiX prototypes are under test
Detector Gap
Hex Sensor (1024 pixels)
Technical Feasibility: HCalGlass RPC (Argonne) is a viable hcal detector candidate
RPC Slice Test Results
Multiplicity vs Efficiency Response to ElectronsNumber of Hits for Different Energies
Digital Hcal countsnumber of 1 x 1 cm2
cells hit in shower
Technical Feasibility: MDIIntegrate final quads Cryogenics, beamline connections, self-shielding
Push-Pull
All in all, there has been a good start on SiD’s conceptual engineering.
• SLIC provides full detector simulation in Geant4 - runtime detector description in XML - stdhep input
• org.lcsim reconstruction/analysis suite - XML detector geometry description - Java-based reconstruction & analysis framework - LCIO standard output
• SLAC Sim/Recon is playing a critical role in new detector development - Generation, Detector Simulation, Reconstruction critical for LoI studies - 100 M event MC samples for physics benchmarking and detector performance studies (thanks BaBar!)
Simulating SiD’s Performance withSLAC’s LC Simulation/Reconstruction Toolkit
Perfect for System Development easy to define detectors easy to use works on multiple OS
Being used for ATLAS studiesand Test Beam Analysis
Simulations use Full Monte CarloNewly Created Pattern Recognition codes• SiD Iowa Particle Flow Algorithm demonstrates desired jet
energy resolution in full SiD Monte Carlo
• SiD Pattern Recognition/Tracking is fully efficient with superb momentum resolution in full Monte Carlo
ZZ Events at 500 GeVE/E = 4.0 % (rms 90)
Vs cos Vs pT
p/p vs p
Backgrounds Fully Simulated• Salt and Pepper Backgrounds arise as 10 TeV of e+e- pairs hit the
beamcal, showering the detector with MeV photons ee,,, hads comprise a physics background for all events
• Tracker performance near perfect in full MC physics + all backgrounds
150 Bunches (TPC) 1 Bunch (Si Tracker)
Physics Benchmarking StudiesCan LC Detectors really do the Physics?
• LoI Benchmark Reactions
• Ground Rules: Full MC; Actual Reconstruction Code; Include backgrounds
Higgs Recoil Analysis
e+e -H +-H
MH = 0.040 GeV ZH/ZH = 0.031 for 250 fb-1
No Impact fromBackgrounds
Chargino and Neutralino Masses
• Reconstructed Boson Masses: PFA discriminates W’s and Z’s
• Reconstructed Boson Energies. The endpoints measure masses.
Pure Pure 0
EW EZ m() = 0.45 GeVm(2
0) = 0.49 GeVm(1
0) = 0.16GeV + SMBKG
What’s Next?
• The LoI’s have established a new level of confidence in detector feasibility and projected physics performance for LC detectors
• What remains is the homework for the Detector Technical Reports in 2012:
- Demonstrate proofs of principle for all critical components
- Complete a realistic conceptual engineering description for the detector and machine-detector integration
- Develop a correspondingly realistic simulation for the detector
- Benchmark the physics performance of the detector in full simulation, including backgrounds, at 500 GeV and 1 TeV.
SiD needs help in all these areas, significantly more support, and new collaborators to accomplish these goals.
SLAC’s SiD Group
SiD Department Marty Breidenbach John Jaros
SiD Sim/Recon Norman Graf Ron Cassell Tony Johnson Jeremy McCormick
SiD Ecal Electronics Gunther Haller Dieter Freytag
Ryan HerbstSiD Tracking Tim Nelson
Rich PartridgeSiD MDI/Polarization Tom Markiewicz Ken Moffeit Takashi MaruyamaSiD Benchmarking Tim BarklowSiD Vertex Detector Su Dong
Contact Us!
SLAC USERS working on SiDU Colorado S. Wagner
U. NauenbergUC Davis M. Tripathi R. Lander U Iowa M. Charles
U. MallikMississippi L. Cremaldi
J. Reidy H. Zhao
MIT R. Cowan P. Fisher D. Yamamoto
U Oregon J. Brau R. Frey N. Sinev D. Strom
UCSC B. SchummWisconsin H. Band
Plus Growing International Participation: Annecy KEK Tokyo RAL Oxford