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Etienver (2003) Helium + alcohol mixture High energy crossing electrons (> 4.5 MeV)

Etienver (2003) Helium + alcohol mixture High energy crossing electrons (> 4.5 MeV) V. I. Tretyak (2003/2004) Helium + alcohol + argon + water > Feb 2003 Works well for drift time > 60 ns. In both cases: TDCFAST_MIN = 220  drift time cut off at 1750 ns All planes calibrated together.

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Etienver (2003) Helium + alcohol mixture High energy crossing electrons (> 4.5 MeV)

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  1. Etienver (2003) • Helium + alcohol mixture • High energy crossing electrons (> 4.5 MeV) • V. I. Tretyak (2003/2004) • Helium + alcohol + argon + water • > Feb 2003 • Works well for drift time > 60 ns In both cases: TDCFAST_MIN = 220  drift time cut off at 1750 ns All planes calibrated together

  2. Data selection Performed calibration on 1 year of data: Jan-Dec 2006 (inclusive): 814 betabeta runs Track cuts: 2 tracks negative curvature associated with scintillator 2 scintillators hit angle from z-axis: min = 40°, max = 140°. cosine θ ≤ -0.5 Energy cuts: minimum energy = 200 keV maximum energy = 100 GeV Time of flight cuts: internal tof: < 1% external tof: > 4% Vertex cuts: dr < 2 cm dz < 4 cm Other: Geiger hit assoc with track

  3. At low drift times, Gaussian fits bad (give negative medians)  use mode At higher drift times, Gaussian fits are better and lower stats make the mode redundant  Use Gaussian Cut on first plane: chi2/ndf > 3.5 Cut on second plane: chi2/ndf > 5 Cut on fourth plane: chi2/ndf > 3.3 Cut on fifth plane: chi2/ndf > 2.5 Cut on seventh plane: chi2/ndf > 2.5 Cut on eighth plane: chi2/ndf > 3.8 Cut on ninth plane: chi2/ndf > 2.5

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