Difference between revisions of "Analysis"

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Revision as of 00:04, 7 August 2007

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
1606 1500 25488 25559
1606 1946 25560 25609
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

Pion

Quality Checks

Rates

Asymmetries