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Etienver (2003) Helium + alcohol mixture High energy crossing electrons (> 4.5 MeV) - PowerPoint PPT Presentation


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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)

  • 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


Data selection

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


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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