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



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



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

Both cuts are applied

Etotal over P using both cuts.gif

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

Einner over P using both cuts.gif

summary table

Beam Energy Torus Current Begin Run End Run cuts
1606 1500 25488 25559
1606 1946 25560 25605
1606 1500 25669 25732
1606 1500 25742 26221
1606 -1500 26222 26359
5764 -2250 26468 26722
5764 0 26723 26775
5764 -2250 26776 26851
5735 -2250 26874 27068
5735 2250 27069 27198
2288 1500 27205 27351
5627 2250 27356 27364
5627 -2250 27366 27380
5627 2250 27386 27499
5627 965 27502 27617
1724 -1500 27644 27798
2562 -1500 27799 27924
2792 -1500 27936 27941
2562 -1500 27942 27995
2562 1500 28001 28069
4239 2250 28074 28277
4239 -2250 28280 28479
4239 2250 28482 28494
4239 -2250 28500 28505
4239 2250 28506 28510
1724 1500 28512 28526
1724 -1500 28527 28532
3210 -2250 28549 28570

Pion

Quality Checks

Rates

Asymmetries