Muons & Particle ID. Muon/PID Studies

Transcription

1 Muons & Particle ID Muon/PID Studies Global Simulation Software Dev. - A. Maciel - NIU - Tracking/ID w/µ, π, bb events C. Milstene NIU/FNAL Scintillator Module R&D Overview G. Fisk FNAL MAPMT Tests/Calib/FE Elect. P. Karchin Wayne St. Digitization & Readout M. Tripathi UC Davis Geiger Mode APD R&D - R. Wilson Colorado St. European Muon Studies M. Piccolo INFN Frascati 1/15/2004 Gene Fisk 1

2 Major Software Issues Dev. of global cal/muon planar detector representations and first usage. A. Maciel Development of Muon Identification Algorithms Testing the algorithms on: Muons Pions b Pair Events Pion punchthrough Low energy muons C. Milstene & M. Piccolo Gene Fisk 2

3 NICADD Test Beam Simulator Project Description Test Beam Prototype Hadron & EM Calorimeters, Tail Catcher HCal & ECal layering similar to SDJan03 Polystyrene and Silicon sensitive regions A. Maciel 1/7/2004

4 All Trajectories and Lit Cells: Side View pi+ E = 20 GeV all traj & lit cells Simulation implemented in standalone G4 and Mokka Mokka A. Maciel 1/07/2004

5 Strip Width Studies G. Lima J. Simmons V. Zutshi A. Maciel Limits are determined by; minimum: maximum: geometry and reconstruction only does not include light collection geometry only -- σ x (hits) w.r.to the previous layer -- cost (#of channels) -- hit densities -- geom. resolution (e.g. track matching) We looked at multiple scattering σ x and hit densities using a GEANT4 implementation of the Tail Catcher. For calorimetric studies see Vishnu Zutshi s talk, calorimetry session 6. A. Maciel 1/07/2004

6 σ(x) w.r.t. incident position 4 cm strips => σ = 1.2 cm A. Maciel 1/07/2004

7 Muon ID Algorithm Development SiD detector: R in = 349 cm; R out = 660 cm. 1.2 Single Muons 5 cm thick Fe; 32/ cm gaps instrumented. 1. Extrapolate fitted tracks to EC, HC and MuDet. Efficiency de/dx ignored in matching de/dx implmented in matching Series1 Series2 2. Collect hits in ( θ, ϕ) bins about extrapolated trks For muons with p > 3 GeV/c require 16/32 hits taking into account de/dx Muon Momentum (GeV/c) Similar studies by M. Piccolo C. Milstene 1/07/2004

8 Muon ID Algorithm Development Analyze single pions with the same algorithm to get punch-through. At 50 GeV/c it is 1.4%. Response to Pions /700 = 1.4% histogram = Piccolo = Milstene p C. Milstene July 2003

9 _ Muon ID for bb Events 10K bb 500 GeV Pandora Pythia generated at NIU. Single muon eff. µ from bb C. Milstene 1/07/2004

10 _ Hadrons near muons. for bb For 5000 bb events there were 136 tracks that satisfied the µ algorithm but were labeled as hadrons entering the µ detector, because there was a hadron in the allowed ( θ, ϕ) window of the extrapolated track. Many of these are low p tracks. About 70% of these tracks have two, or sometimes three, nearby tracks where one is a true µ. By using the µ ID algorithm in Hcal, (# of hits/layer, etc.) it looks like about 2/3 of these tracks can be identified as muons or hadrons. M. Piccolo has also looked at low momentum µ tracks, because of interest in LC physics, e.g. LSP could be massive, slightly less than the smuon mass. Use Hcal. Work in progress Intra-detector studies! C. Milstene 1/07/2004

11 Hardware Development Layout of Scintillator Strips in one Plane P. Karchin Scintillator Based Muon System Collaboration page 14 1/8/2004

12 Optical Fiber Work at Notre Dame M. Wayne 64 long pieces of clear fiber polished and tested with LED- Photodiode system. σ of < 0.5% for all fibers. WLS-clear fiber splicing at Fermilab; transmission tests at ND Fabricate small mockup by mid-january to study: 180 o turn at end of scintillator Protection of chamber edges Channeling of clear fibers back to PMT Interface between scintillator/routing plate/outer skin P. Karchin - Scintillator Based Muon System Collaboration

13 PMT Test and Calibration at WSU A Hamamatsu R5900-M16 MAPMT mounted in a MINOS (far detector) base. The assembly has been modified to accommodate an aluminum guide for optical fibers. The 16 holes in the aluminum block are aligned with the MAPMT photocathode grid. Ambient light or pulses from an LED are injected into individual pixels. Cables are visible for HV bias and anode signal readout. P. Karchin 1/08/2004

14 PMT Test and Calibration at WSU M16 PMT with MINOS base response to LED pulse PMT LED P. Karchin 1/08/2004

15 UC Davis MAPMT test-stand Bias-board PMT/Preamp Board Mounts With 90 o Calibrated Rotation LED Pulser Dark-box M. Tripathi 1/07/2004

16 UC Davis Pre-amp Board housing 16 channel PMT and Amplifiers 4.5 x 4.5 Dynode resistor chain built-in 16 amplifier chips onboard M. Tripathi 1/07/2004

17 Geiger Mode Avalanche Photo-Diode R.Wilson GPD Scintillator/Fiber Test Bed Flat Mirror Optically Coupled to Readout Fiber End Detector Scintillator Trigger Scintillator Stack Y11 Readout Fibers (4*) Extra length of Y-11 Fiber Epoxied to Readout Fiber End Aluminum Light Shield Tube Around Fiber GPD Mounted to X-Y Translator Stage * For these measurements only a single fiber was instrumented with GPD readout. Estimate average 4 photons/event at the end of spliced 1 mm diameter Y11 cores fiber and 0.15 mm GPDs. Use QE*A=0.069 estimated for single 150 micron GPD at 20 o C using LED - predict DE~0.24 neglecting additional losses, such as Fresnel reflection at the Y11-GPD interface. Preliminary measured detection efficiency in test bed: 21±5(stat.)±??(sys.)% R. Wilson 1/07/2004

18 New RPC production (the CAPIRE collaboration) 14/10/ /10/ m X 1 m Screen printed resistive coating M. Piccolo 1/08/2004

19 Spatial resolution A good glass RPC Resolution of single RPC of the same order as the bakelite one. Here too the actual value of the spatial resolution is set by the strip pitch. Fit with two Gaussian distributions lead again to a ratio narrow/wide 20:1. M. Piccolo 1/08/2004

20 BTF 4+1 RPCs Scintillator Calorimeter beam M. Piccolo 1/08/ cm strips 8 strip=1 ADC ch

21 Typical plateau curve M. Piccolo 1/08/2004 Plateau curves for our standard mix (48/48/4) (Ar/Fr/Is). Four different 1m 2 chambers. The beam was hitting the lower left corner of the detectors A fast area scan did not show any

22 Future Activities Simulation Global development: Planar detectors/45 o strips studies. Muon ID algorithms: low p using Ecal/Hcal; isolation cuts; full detector tracking χ 2 for µ/had discrimination; w/sid. Event samples: µ, π, bb, µµ ~~ with (m µ ~ m lsp ) small. Hardware QA existing scintillator, WLS & clear fiber. 1m strip R&D: fiber splice tests, fiber routing, light tighting, MAPMT mech., HV, etc. MAPMT calibration,cross talk, noise, shielding, etc. FE electronics, prototype digitization and DAQ for 128 channels (single plane). G. Fisk 1/9/2004