Analysis

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Particle Identification

Electron

Cuts

Calorimeter based cuts

The distributions below represent two types of cuts applied to improve the electron particle identification (PID) using a 4 GeV electron beam incident on an NH3 target. The electron calorimeter is segmented into an inner[math]EC_{inner}[/math] and an outer[math]EC_{outer}[/math] region. The total energy absorbed by the calorimeter system is recorded in the variable [math]EC_{tot}[/math]. The momentum ([math]P[/math]) is calculated using the reconstructed track and the known torus magnetic field. The distributions of [math]EC_{tot}[/math] and [math]EC_{inner}[/math] are shown below where both have been divided by the electron momentum and no cuts have been applied.


[math]EC_{tot}\gt 0.2*p[/math]

Without any cuts we have 181018 entries. After using the following cut [math]EC_{tot}\gt 0.2*p[/math] we are getting 127719 entries, which is about 70.55% of 181018.

Etotal P using tot cut.gif
Einner P using tot cut.gif




[math]EC_{inner}\gt 0.08*p[/math]

After the cut on the energy deposited into inner part of electron calorimeter, number of entries decreases by 22%.

Etotal P using inner cut.gif
Einner P using inner cut.gif



Both cuts [math] EC_{tot}\gt 0.2*p EC_{inner}\gt 0.08*p [/math]

In case of using the cuts of the total deposited energy and the energy deposited into inner calorimeter number of entries decreases ~36%

Etotal P using both cuts.gif
Einner P using both cuts.gif



summary table

Beam Energy Torus Current Begin Run End Run file used cuts
[math]EC_{tot}\gt 0.2*p[/math] [math]EC_{inner}\gt 0.08*p[/math] [math]EC_{tot}\gt 0.2*p [/math] and [math] EC_{inner}\gt 0.08*p[/math]
1606 1500 25488 25559 dst25504_02.B00 64% 49.5% 78%
1606 1946 25560 25605
1606 1500 25669 25732 dst25669_02.B00 64% 49% 78%
1606 1500 25742 26221 dst25754_02.B00 21% 11% 24%
1606 -1500 26222 26359 dst26224_02.B00 4.6% 3% 6.6%
5764 -2250 26468 26722 dst26489_02.B00 12.2% 14.4% 19.1%
5764 0 26723 26775 dst26779_02.B00
5764 -2250 26776 26851
5735 -2250 26874 27068 dst26904_02.B00
5735 2250 27069 27198 dst27070_02.B00
2288 1500 27205 27351 dst27225_02.B00
5627 2250 27356 27364 dst27358_02.B00
5627 -2250 27366 27380 dst27368_02.B00
5627 2250 27386 27499 dst27388_02.B00
5627 965 27502 27617
1724 -1500 27644 27798 dst27649_02.B00
2562 -1500 27799 27924 dst27809_02.B00
2792 -1500 27936 27941 dst27937_02.B00
2562 -1500 27942 27995 dst27942_02.B00
2562 1500 28001 28069 dst28002_02.B00
4239 2250 28074 28277 dst28075_02.B00
4239 -2250 28280 28479 dst28281_02.B00
4239 2250 28482 28494
4239 -2250 28500 28505
4239 2250 28506 28510 dst28509_02.B00
1724 1500 28512 28526
1724 -1500 28527 28532
3210 -2250 28549 28570

Pion

Quality Checks

Rates

Asymmetries