1 ILC/SiD Muon System Progress Colorado State – D. Warner, R. Wilson Fermilab – G. Fisk, C. Milstene UC Davis – J. Lizarazo, M. Tripathi Indiana University – R. Abrams, R. Van Kooten Northern Illinois University – G. Blazey, D. Chakraborty, A. Dychkant, G. Lima, A. Maciel, V. Zutshi, University of Notre Dame – M. Wayne Wayne State University – P. Karchin University of Wisconsin – H. Band

2 ILC/SiD Muons - Organization Simulation: A. Maciel, G. Lima, C. Milstene Scintillator-strips: A. Dychkant, G. Fisk, R. Abrams, M. Wayne, M. McKenna, FNAL/NIU Multi-anode PMTs: P. Karchin GM-APDs – D.Warner, R. Wilson RPCs – H. Band Strip Plane Assembly: at UND: M. Wayne Electronics: M. Tripathi, R. Abrams Testing: R. Abrams, R. VanKooten, G. Fisk Testbeam: D. Chakraborty, V. Zutshi, R. Abrams, et al.

3 Snowmass and Since At Snowmass: 2.4 m radial Fe for central B flux return. => 24 X 10cm gives cm gaps for detector planes. For study: ~0.5mm defn of incoming  ’s may be useful for: multi-muons, high energy  ’s & separation of  ’s & hadrons. Need for a separate muon detector. Both hardware and software studies needed.

4 Strip-Scintillator Hardware R&D Goals: Understand existing tech. Establish LC  - det. specs. Electronics specs. Estimate costs. Iterate on design/R&D/cost Two 2.5 m X 1.25m 64 strip planes being tested. H7546B MAPMT and a standard single anode PMT are being used for initial tests.

Scintillator Strips Wavelength-Shifter Fibers Cookie MAPMT Connector Box RG/174 Cables Clear Fibers RG/174 Cables 2249A ADC Trigger Gate DAQ/PC CAMAC 8 x 8 array Discr & coinc logic Scalers Delay NIM Test Setup in Lab 6 R. Abrams

6 ILC Scintillator-based Muon Detector R&D UC Davis, Indiana, Notre Dame, Wayne State, Fermilab Scintillator –strip tests in Lab 6 on two 1.25m X 2.5 m planes. MAPMT H7546B photo-detector (64 anodes). Integration of the current for the right-hand plot signal gives Q = -3.8 pC = 2.4 E07 electrons. WLS decay time ~12 ns. 5 ns/div. Cs Source Cosmic Rays

7 Preliminary Data and Analysis Rise-time is very fast ~1ns; WLS (Y-11) decay time is much slower. It is recently measured to be 12.1 ns in 1mm dia fiber. Multiple pulses are observed and also reflected light. Our plan was to use time-over-threshold to measure charge. Our new plan is to integrate the MAPMT pulses using LeCroy 2249a ADCs to measure charge collected vs. longitudinal position of charged particles that pass thru the scintillator strips. When we have independently measured the MAPMT gain vs. HV we will then know the number of photo- electrons. Need more than eposodic data and analysis!

8 Further Tests and Issues Presently drafting an MOU with Fermilab to use the Mtest beam to test 4 modules – two shown in the picture and two that are being finalized at UND. Some data before the end of February when a 14 week shutdown will occur? Limited scope for first tests: ADC measurement of PMT pulse charge; Also need bench meas. of Gain vs. HV. If possible charge vs. longitudinal pos’n along several strips on the 4 planes.

9 More Issues Mtest in July and beyond - Muons and PWCs to measure efficiency vs. transverse pos’n. Collaborate with ANL/NIU on calorimeter/tail catcher preliminary measurements. SiPMs – Will work with NIU, Russians, Irish, Asians to test Si detectors. Faster WLS – longitudinal pos’n from timing. Readout on both ends needed? Two 1.2mm fibers in one 2mm X 2mm pixel? RPCs? International collaborators?

10 Muon ID with b – b Events HCal & MuDet 10,000 inclusive b-pair events. Use charged tracks in the barrel. 0.9  2.2 P  3 GeV/c Caroline Milstene _

11 B-pair Event C. Milstene

12 P-Distribution of  &  Generated vs Detected from B-Bbar Generated Pions Yellow Generated Muons light blue Detected Muons navy blue Pions Detected as Muons in Red.

13 P  Distribution for P  3 GeV & P  < 3GeV in Barrel & EndCaps

14 10,000 b – b Events Barrel μ π KProtons Generated Generated P>3 GeV Recons. P>3GeV Fitted _

15 Layers with non-zero Hits HCal & MuDet MuDet Coil HCal # of s

16 Muon ID Algorithm 1)Project charged tracks into Hcal and MuDet. 2)(      mr Hcal (      mr MuDet Road in Hcal = (2    3   ) Road in MuDet = (2    2   ) (3)Examine the # of hits in the angular road:  – minimum ionizing = 1 or 2 hits (boundary Xing) h - # of hits > min-I and/or gaps in layers = 0’s. (4) N s = N o exp(-l/ ) Require min-I+ in last 5 gaps HCal

17 Example of Muon ID With HCal Barrel Requiring  24 hits/24 layers Conditions for 10000bb_bar Tracker Recons & Final Tracks Muons 739 Pions Kaons 4303 Protons Good Fit Tracker ≤ minHCalHi t ≤2 1≤ 5lastHCalLay ≤ HCal ≥24hits,≥24layers

18 Example of Muon ID MuDet Barrel  12 hits/  12 layers Conditions for 10,000 b Pairs: Tracker Recons & Final Tracks Muons 739 Pions Kaons 4303 Protons 1712 Good Fit Tracker 715 (705) ≤ minHCalHi t ≤2 5lastHCalLayer > Mudet ≥ 12hits ≥ 12layers Min Mudet Hits ≤2 Max Mudet Hits ≤

19 Efficiency & Purity vs. # Eff. ~95% Purity improves w/ increasing λ ~69% => ~86% End Of HCal C. Milstene

20 Conclusions & Comments First measurements from ¼ scale strip scintillator planes obtained. Need more systematic studies => beam tests indicated; Mtest MOU coming. Calibration of MAPMT gains, on-board calib.? Too many loose ends to make an adequate cost estimate; double ended readout, SiPMs, faster WLS, etc. Existing scintillator/MAPMTs look OK, but perhaps there is something better (Si). Longitudinal pos’n from timing? Muon ID studies indicate the need for a muon system. 7 is not enough. Need to look at other physics benchmarks to test present Muon ID algorithms. Continue muon software efforts. Forward muons need a sponsor!

21 P Distribution of  /  /K/p Identified as  ’s

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24 Hardware Development