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Pi/Mu Separation and Muon dE/dX

Pi/Mu Separation and Muon dE/dX. Leo Jenner, UCL. In Brief…. Pi/Mu separation runs at CalDet this year Pi/Mu dE/dX Plane efficiency Pion contamination of muon sample. Test beam to CERN East Hall contains electrons, pions, muons, kaons, protons, deuterons

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Pi/Mu Separation and Muon dE/dX

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  1. Pi/Mu Separation and Muon dE/dX Leo Jenner, UCL Cambridge Collaboration Meeting

  2. In Brief… • Pi/Mu separation runs at CalDet this year • Pi/Mu dE/dX • Plane efficiency • Pion contamination of muon sample Cambridge Collaboration Meeting

  3. Test beam to CERN East Hall contains electrons, pions, muons, kaons, protons, deuterons • Pions usually shower but occasionally look identical to muons • Special Cerenkov runs: over and under pion threshold 1.8 GeV Cambridge Collaboration Meeting

  4. Before and after collimators from Turtle Lph: 49/50 Cambridge Collaboration Meeting

  5. 30036 of 36310 events fired neither cerenkov Cambridge Collaboration Meeting

  6. Cambridge Collaboration Meeting

  7. Range > 40 to remove electrons • Both(muons): 3176, 3not1(pions): 806, 1not3: 427, neither: 4189 • Cerenkov 3: 85% efficient, good agreement with MK Cambridge Collaboration Meeting

  8. Cov cut doesn’t get all PS muons and eat lots of real muons • Also try correcting for plane efficiencies Cambridge Collaboration Meeting

  9. Plane 2 and 6 hit… was plane 4 hit? Blue: Plane 2 and 4 hit… was plane 0 hit? Cambridge Collaboration Meeting

  10. Cambridge Collaboration Meeting

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  12. 48 < Range < 57 • Scaled by plane efficiencies Cambridge Collaboration Meeting

  13. Lph=53 Magnets deviated? Pion dE/dX Cambridge Collaboration Meeting

  14. Sum of deposited energy 60 keV / sigcorr ADC 33.96 MeV deposited per plane (averaged along entire track) 27.96 MeV / plane expected from Bethe-Bloch (25.86 + 2.1 + 0.0031) Cambridge Collaboration Meeting

  15. Cambridge Collaboration Meeting

  16. 15% back to pions, 2.25% to muons Far more muons than expected Cambridge Collaboration Meeting

  17. Conclusion • Many PS muons • Cov 3 about 85% efficient • CalDet plane efficiency about 88% • Range cut much more successful than Cov cut • Focussing magnets may have deviated • 60 keV / sigcorr ADC • Many more muons than expected w.r.t. pions Cambridge Collaboration Meeting

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