pi/mu separation and muon de/dx
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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Pi/Mu Separation and Muon dE/dX
Leo Jenner, UCL
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In Brief…
• Pi/Mu separation runs at CalDet this year
• Pi/Mu dE/dX
• Plane efficiency
• Pion contamination of muon sample
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Test beam to CERN East Hall contains electrons, pions, muons, kaons, protons, deuteronsPions usually shower but occasionally look identical to muonsSpecial Cerenkov runs: over and under pion threshold
1.8 GeV
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Before and after collimators from Turtle
Lph: 49/50
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30036 of 36310 events fired neither cerenkov
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Range > 40 to remove electrons
Both(muons): 3176, 3not1(pions): 806, 1not3: 427, neither: 4189
Cerenkov 3: 85% efficient, good agreement with MK
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Cov cut doesn’t get all PS muons and eat lots of real muons
Also try correcting for plane efficiencies
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Plane 2 and 6 hit… was plane 4 hit?
Blue: Plane 2 and 4 hit… was plane 0 hit?
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48 < Range < 57
Scaled by plane efficiencies
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Pion dE/dX
Lph=53
Magnets deviated?
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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)
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15% back to pions, 2.25% to muons
Far more muons than expected
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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
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