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Muon System Studies

Gene Fisk – Fermilab 1/7/2002 Chicago LC Workshop. Muon System Studies. Sources of Muons Muon System Specifications RPC Detector Studies Scintillator Detector Studies R & D Issues. Sources of Muons. Conventional EW Physics New Physics Beamline Muons. Conventional Physics –Muon Sources.

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Muon System Studies

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  1. Gene Fisk – Fermilab 1/7/2002 Chicago LC Workshop Muon System Studies • Sources of Muons • Muon System Specifications • RPC Detector Studies • Scintillator Detector Studies • R & D Issues

  2. Sources of Muons • Conventional EW Physics • New Physics • Beamline Muons

  3. Conventional Physics –Muon Sources

  4. Higgs Production From J. Bagger et al, The Case for a Linear Collider ..

  5. *BR of H to one or more muons for H(140), ignoring Z =>bb +> m for H(350), …. BRH = BR(H=WW*2*BR(W=>m) + BRH = BR(H=WW*2*BR(W=>m) + BR(H=>bb*2*BR(b=> m) BR(H=>ZZ)*2*BR(Z=> m) + BR(H=>tt)*2*BR(t=> m) = 0.48*2*(1/9) + 0.37*2*0.1 = 0.68*2*(1/9) + = 0.181 0.31*2*0.03367 + 0.01*2*0.19 = 0.176

  6. BeamLine Muons T. Tauchi, LCWS_Sitges pg 811, and LCWS_2000 pg 107 Collimation using concentric magnetized axial toroids. B = 10KG; B+ for 1 < r < 10 cm; B- for 10 <r < 30 cm. ~1010 e’s/RF bucket with 0.1 - 1% lost in phase-space tails. Attenuation: ~1 X 105 - No shield ~3 X 107 - Collimation (x, y, px, py) w/o B ~109 - 1010 - Collimation w B Also will attempt to eliminate phase-space tails at 8 GeV. Expect < 1 to 10 beamline m’s per pulse.

  7. Muon Rate Summary • One year (107 s) at 1034 cm-2 s-1 is 100fb-1. • Conventional sources of muons: • 2 pb * 100fb-1 * 50% eff. = 100K events. • New Physics: Higgs => muons • 25 – 50 fb * 100fb-1 * 50% = 3 –5 K events • Beamline Muons: Assume 1m for each 1012 • electrons. • NLC: 190 pulses w/0.75 E10 e’s/pulse in • 266 ns => 1.46 m’s per train. • JLC: 72 pulses w/ 1.1 E10 e’s/pulse in • 202 ns => 0.8 m’s per train. • TESLA: 2820 pulses in 0.95ms => 29 pulses • in 10ms w/ 2E10e’s/pulse, => • 0.58 m’s per 10 ms.

  8. TESLA Detector • The Fe thickness is determined by: • Fe cross-sectional area for B flux return; • Muon identification requirements. • These imply 1.6m for the total Fe thickness.

  9. Muon System Specifications • Muon Identification by penetration through 12 – 14l. • Muon Charge & precise Momentum from central tracking. • Muon Tracking and Link-up with cent. tracking: ~15 hits • High Tracking Efficiency. • Tail-catcher Calorimeter. • Must identify conventional and new physics muons and background muons from the beams and cosmic surces. Candidate technologies: (1) Resistive Plate Chambers (2) Scintillator Based Detectors

  10. Central Tracking Momentum Resolution From: “Detectors for the Next Linear Collider” ed. J. Brau et al; Snowmass 2001

  11. Hit Density for b b Events Max. hit density (/sq. cm) From TESLA Design Report – M. Piccolo et al

  12. Efficiency vs. Muon Momentum Monte Carlo Muon Momentum From TESLA Design Report – M. Piccolo et al

  13. Leakage Hadronic Energy Resolution From: TESLA Design Report – M. Piccolo et al Calorimetric Energy for Hadrons Entering the Muon System

  14. Scintillator Based Muon System • Why scintillator? - Additional calorimetry needed. Cal depth is: 3.2l , 5.4l, 6.7l for NLC(P),TESLA, NLC(L) Example from Dishaw et al - Demonstrated technology. Robust. Used in many neutrino expts for m’s & h’s. MINOS, e.g. - Detectors can be calibrated – with effort. LED pulser plus initial beam tests. - With scintillator strips, m ’s can be tracked. - The precise measurement of of pm is done via central tracking. • Proposed Layout - 16 – 5cm gaps between 10cm thick Fe plates. - Module sizes: 940(L)X(174 to 252)(W)X1.5 cm3. - 4.1 cm X 1 cm extruded scint.: 8u & 8v planes. - Light output from both ends: 11(n) + 6(f) p.e.s. - Use multi-anode PM; 94K fibers X2 channels. - Expect ~ 1/√E for calorimetry.

  15. Sampling Calorimeter E379 P. Dishaw Thesis SLAC-216 Fe & Plastic Scintillator 30” H X 30” W Plates: 1 – 20 1.5” Fe 21 – 45 2” Fe 46 – 49 4” Fe 7.58l 11.52 l <E> = 389 GeV <E> = 400 GeV

  16. Steel Cross-section 4.45 m 6.55 m Fe thickness = 10 cm, Gap = 5 cm

  17. Scintillator Layoutu and v strips

  18. MINOS Scintillator One of the best modules Number of observed photoelectrons Distance along the module (m) Q.E. 13.5% 3.6 m Far – proposed geometry 6±2 p.e.s Near 11±3 p.e.s Light output using the full MINOS apparatus: Connectors, clear fibers, multi-anode PMTs, ….

  19. R & D Issues • Physics analysis for detector designs: • Shower leakage into the muon system; • Tracking studies for detector options; • Energy flow analysis using the muon system; • Muon system response to the broad spectrum of physics processes; • Muon system performance at 1 TeV. • Detector design questions: • Module layout; • cell sizes, materials, readout techniques • Electronics: • Evaluation of existing designs. For scintillator, what photo detector? What size and fiber arrangement? • Cables/fibers and cable/fiber routing; • FE electronics, multiplexing, readout, .. • Software vs. firmware; • Mechanical engineering: • Fe structures, installation problems, • detector module layout, tooling, ..

  20. R & D Issues (cont.) • Prototype detectors: • R&D Proposal and Schedule • Manpower and Budget • Testing facilities • Test Beam: • Test Beam Proposal • Experiment Proposal

  21. m & PID Parallel Session TalksTuesday 1/8/02 2pm Rm 208 1.    Robert J. Wilson: Hadron ID Fast Simulation in the LCD JAS Package: Status  - 10 min.  2.    M. Piccolo: TESLA Muon System Design: Progress and Plans   -   15 min.  3.    O. Prokofiev:  Aging Studies of CMS Muon Endcap Chambers  -  20 min.  4.    A. Para: MINOS Scintillator: Production and Test Results  -  15 min.  5.    D. Chakraborty: Preliminary Studies of Hadronic Shower Leakage into the LC Muon System   -  10 min.  6.    R. Stefanski  -  Costing Methodology   -   10 min. 

  22. Efficiency for BELLE RPC’s From the BELLE Website: http://beauty.bk.tsukuba.ac.jp/belle/nim/total/node88.html

  23. Channel Count, etc.

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