1. Calorimeter design & simulations for Stage I Rikard Sandström University of Geneva MICE PID phone conference 2005-12-02

2. Introduction Case studied in this talk: –Stage1 (TOFs & calorimeter only, no mag field) –Flat beam 100<pz<300 MeV/c, starting upstream of TOFs. –6 pi mm -> Many tracks lost due to geometry Contaminations: –Pions & pion decay products –Muon decay products Electrons surviving momentum selection upstream very easy to filter out with TOF. Calorimeter geometries: –KLOE light, 4 layers –KLOE light, 5 layers –Smörgås/sandwich, one 4 cm KLOE light layer –Smörgås/sandwich, one 2 cm KLOE light layer

3. Experimental setup Beam is contamined by pions and decay products from muons. A few more complicated situations –Pions decaying to muons between TOFs –Muons missing last TOF, and giving hits from backscattering. mu pi e gamma

4. KLOE light, 4 layers Need for collimator

5. KLOE light, 4 layers Muons punching through

6. KLOE light, 5 layers

7. Smörgås, muon decay products

8. Smörgås, muon & pion Red = muon, black = pion, green = pion becoming a muon between TOFs

9. Pion-muon, KLOE light 5 layers Red = muon, black = pion, light blue = pion becoming a muon between TOFs

10. Pion muon, smörgås Red = muon, black = pion, light blue = pion becoming a muon between TOFs

11. Problem with muons at low p z Red = muon, blue = e+, green = photon Muons sometimes stop in KLOE layer

12. With 2 cm thick KLOE layer Pushes cutoff to lower p Red = muon, blue = e+, green = photon

13. Comments and future plans All designs presented can do both positron rejection and pion rejection. In order to justify geometry decision, I need more statistics. –(According to Alain.) How many events are needed? Output format of G4MICE is changing as we speak. –Will take more data with the same beam once software is again stable.