Oct 8, ‘02

Analysis of the 2002 HC Test Beam Data

Here is some VERY preliminary results of my analysis of some of the runs. The runs 3328,

3329, 3331, 3332, 3333 form a group of pi- beam with 5 different energies. According the

WEB and paper logs, they also have the same eta phi values, even though the data readout show

different angles for runs 3331 and 3332, the two lowest energy runs.

I used run 3329, a 300 GeV run to tune the cuts. For HC, the timeslice cuts and tower

grouping cuts were adjusted to get the best resolution. For EC, since there seems to be a lot

of energy spread, all channels were included. The EC to HC weighing factor was also adjusted.

It's found to be SUM = HC + EC * 0.855.

For the 50, 100, 300 GeV runs, the measured energy scaled very well, the resolution is also

proportional to 1/SQRT(E). The 30 and 20 GeV runs will need more work.

For 300 GeV (Run 3329), there is a hump at the lower end of the energy distribution. If

That is excluded in the fit to a Gaussian, the Resolution goes down to 7.0%.

The Results will be updated as more work is done.

Web Data Paper Log

run GeV Part. eta phi eta phi eta phi Sum Sigma % Comments

3271 300 pi- 0.220 0.240 3 3 3 3 ec adc bad

3275 20 pi- 0.220 0.240 3 3 3 3 ec adc bad

3328 100 pi- 0.740 0.320 9 4 9 4 768.5 97.2 12.63

3329 300 pi- 0.740 0.320 9 4 9 4 2353.5 174.2 7.40

3331 30 pi- 0.740 0.320 12 8 9 4 264.8 83.8 31.64

3332 20 pi- 0.740 0.320 10 4 9 4 153.3 68.3 44.55 50->400

3333 50 pi- 0.740 0.320 9 4 9 4 385.7 76.1 19.73

3336 30 pi- 0.740 0.320 12 8 9 4 205.9 61.0 29.62

3337 20 pi- 0.740 0.320 9 5 9 4 134.8 60.5 44.88 50->400

3339 20 pi- 1.090 0.320 13 4 13 4 128.6 62.1 48.29

3341 30 pi- 1.090 0.320 13 8 13 4 219,8 60.6 27.57

3343 50 pi- 1.090 0.320 12 4 13 4 396.6 72.1 28.28

3344 100 pi- 1.090 0.320 13 5 13 4 818.7 117.7 14.38

3345 300 pi- 1.090 0.320 13 4 13 4 2601.4 278.4 10.70

3357 300 pi- 0.830 0.370 10 5 10 5 2314.9 213.0 9.20

3377 300 pi- 0.860 0.320 11 4 9+ 4 2617.5 246.4 9.41