Full simulator study of muon detector and calorimeter

1. Full simulator study of muon detector and calorimeter 8th ACFA Workshop at Daegu, Korea 2005/07/12 (Tue) Hiroaki Ono (Niigata University) with ACFA-sim-j members 8th ACFA meeting @Daegu

2. Outline • Muon detector status in full simulator • Geometry of muon detector • Magnetic field in return yoke • MUD response with CAL information • Muon signal observation • Muon passing through the CAL • Pion leakage/punch through check • Muon generated from Jet/CAL inside • Summary and next steps 8th ACFA meeting @Daegu

3. 1. Muon detector status in Full simulator • Jupiter (Geant4 based MC generator) • Installation of muon geometry, magnetic field to the generator was finished (Outside of the Solenoid, as a return yoke) • Satellites/jsf (ROOT base Analysis part) • Smearing and muon ID parts are under construction. • Exact(MC truth) hit can be analyzed. I will report on the current status of Muon detector(MUD) related to the Calorimeter in full simulator. 8th ACFA meeting @Daegu

4. 2. Geometry of Muon detector X-Y direction • Active layer (10cm-thick, not segmented) • Air : Default, Gas chamber reserved • Scintillator : test version • Absorber (40cm-thick) • Iron (as a return yoke) • Barrel : 4 layers • Endcap : 5+2(inner) layers • Alternately placed barrel and endcap layer • Octagonal shape in the phi direction 8th ACFA meeting @Daegu Z direction

5. 3. Magnetic field in the Return yoke Return Yoke magnetic field studied by KEK H.Yamaoka-san Unit: Tesla Magnetic field/ Flux line We followed this results to the full simulator magnetic field 8th ACFA meeting @Daegu

6. Magnetic field in full simulator Magnetic field direction and magnitude roughly followed Yamaoka-san’s results 8th ACFA meeting @Daegu

7. Magnetic field test by muon m- 10 GeV single beam Injected to the Barrel direction Opposite curvature at the inside of solenoid and outside. 8th ACFA meeting @Daegu

8. 4. MUD response with CAL information Single beam (p, m) test • Observed muon signal by muon detector • Muons passing through the CAL • Pion leakage from CAL (punch through) e+e-→Z→qq (2 jets) event check • Number of muons produced in Jets • or created inside of the CAL Unfortunately, solenoid is set to air atJupiter default. I checked the interaction length as only 7.1l0 (CAL) Ignored the solenoid material in this study 8th ACFA meeting @Daegu

9. 4.1 Observed muon signal by MUD layer Energy deposit checked in MUD front layer Injection :10GeVm- barrel direction m Threshold will be set to 15 MeV as a MIP signal for the muon finding (mu ID) But muon finding/mu ID part is under construction 8th ACFA meeting @Daegu

10. 5GeV 2GeV 4.2 Muons passing through the CAL Low energy muons can not come out from the calorimeter due to the Energy loss at the CAL and Magnetic field. • -single beam energy scan 1～300 GeV 500 events barrel direction m In this study, I ignored the solenoid material • Less than 5 GeV • Rapidly decrease the number • of muons come out from CAL • Less than 1.5 GeV • No muons can leak out CAL 8th ACFA meeting @Daegu

11. 4.3 Pions leak or punch through from the CAL p-single beam energy scan 2～300GeV500 pions barrel direction Vertical : Number of pions tagged at CAL outside Horizontal : Pion energy observed at CAL outside p p 20 GeV : 11pions(p± ) 100 GeV : 156pions(p±) Punch through Punch through GeV GeV High energy (almost same as incident energy) punch through pions observed. (Still low statistics) 8th ACFA meeting @Daegu

12. Number of pions and Energy leakage from CAL Sum of the pions energy normalized by number of incident pions Number of pions come out from the CAL Incident particle : 500 pions Incident particle : 500 pions 20GeV 20GeV • Leakage energy delivered by pions is about 2% of the incident pion energy. • Number of pions passing through or leaked out from CAL increased from the pions incident energy up to 20 GeV 8th ACFA meeting @Daegu

13. e+e-→Z→qqECM = 300 GeV, Events = 500 events 4.4 Muons generated from jet/CAL mfrom jet mcreated inside of the CAL Muon detector m m Calorimeter p m 8th ACFA meeting @Daegu

14. Muons checked at CAL outside e+e-→Z→qq (2 jets) (Ecm : 300GeV, 500events) • comes from jet (tagged at CAL front and out) • generated inside of the CAL (tagged only at CAL backside) 226 muons observed at CAL out Mean Energy : 18.5 GeV (Max ～ 140 GeV) 22 muons observed Energy : Less than 10 GeV Background of jet origin muon 8th ACFA meeting @Daegu

15. 5. Summary and Next steps Current status... • We finished the installation of MUD geometry, • Magnetic field to the Jupiter. • We checked the MUD response and CAL leakage • by single muon, pion beam and jet events. Next steps... • Change solenoid material to real case and recheck. • BUG fix should be improved in full simulator. • MUD should be changed to the tracker base. • Evaluate Muon finding efficiency. 8th ACFA meeting @Daegu

16. Appendix 8th ACFA meeting @Daegu

17. Full simulator geometry Calorimeter : EM : 4mm lead + 1mm scintillator : HD : 8mm lead + 2mm scintillator EM 27X0 + HD 6.1l0 (7.1l0 ) Solenoid : 85cm(with 10cm core) Pb : dE/dX =217.9MeV/l0 Muon : 200cm (Iron :11.8l0) 8th ACFA meeting @Daegu

18. Muon checked at CAL front (E>1.5GeV) e+e-→Z →qqbar (Ecm : 300GeV, 500events) Number of muons measured at the CAL front • generated inside of the CAL 692 muons observed Energy : Cut > 1.5GeV GeV 8th ACFA meeting @Daegu

19. Muon finding methods (Under construction) m Search MIP peak in the MUD (threshold > 10MeV) All layer passing event required MUD Check mother track CAL(Front/Out) Track matching with tracker CAL Under construction ! Tracker 8th ACFA meeting @Daegu