Difference between revisions of "Analysis"

From New IAC Wiki
Jump to navigation Jump to search
Line 15: Line 15:
  
  
[[Image:Einner_over_P_using_tot_cut.gif | 200 px]]<br>
+
[[Image:Einner_over_P_using_tot_cut.gif | 200 px|right]]<br>
  
 
=====<math>EC_{inner}>0.08*p</math>=====
 
=====<math>EC_{inner}>0.08*p</math>=====

Revision as of 23:26, 6 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.


Einner over P using tot cut.gif


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

Etotal over P using inner cut.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

Pion

Quality Checks

Rates

Asymmetries