[d2n-analysis-talk] BB cer pion rejection plots

[posik at jlab.org]

Hi all,

  So I added some error bars to the BB cerenkov pion rejection factors
that I showed last week. I also redid the rejection factor vs BB Cer
photo electron cut using the pion selection of E/p<0.8 and 10 <
preshower < 250.

So the plot pion_selection.eps shows my pion sample selection.

I then looked at how many particles from the pion sample were passing
through the geometrical location of a Cerenkov mirror, I called this
variable N_p. I then how many of the N_p particles also fired the Cerenkov
ADC and TDC and called this number of events N_e. I then defined my pion
rejection factor as

pion_rejection = N_p/N_e, and following Dr. Meziani's advice took the
Sqrt(N_p) as my error.

I did this for each pmt, see cer_pi_rej.eps for the small angle side and
rhrs_cer_pi_rej.eps for the large angle side. The different data markers
represent the rejection factor at different BB Cerenkov ADC photo-electron
cuts. I also plotted the average rejection factor for each side of the
Cerenkov as a function of photo-electron cut, see cer_avg_pi_rej.eps and
rhrs_cer_avg_pi_rej.eps.

I am now going to do a similar thing for the electron efficiency.Please
let me know what you think of these plots.

Thanks
Matt


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