Difference between revisions of "Analysis"

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=Particle Identification=
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[[Particle Identification]]<br>
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==Electron==
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[[Quality Checks]]<br>
  
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=== Cuts ===
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[[EG1_Teleconferences_DeltaDoverD]]
  
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==== Calorimeter based cuts====
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[[http://wiki.iac.isu.edu/index.php/Delta_D_over_D Back to Delta_D_over_D]]
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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.
 
  
  
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[[ phi angle in CM frame for different runs]]<br>
  
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=====<math>EC_{tot}>0.2*p</math>=====
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[[some things]]
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Without any cuts we have 181018 entries. After using the following cut <math>EC_{tot}>0.2*p</math> we are getting 127719 entries, which is about 70.55% of 181018. <br>
 
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[[Image:Etotal_P_using_tot_cut.gif | 400 px|left]] [[Image:Einner_P_using_tot_cut.gif | 400 px|right]]<br>
 
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=====<math>EC_{inner}>0.08*p</math>=====
 
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[[Image:Etotal_P_using_inner_cut.gif | 300 px|left]]<br>
 
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[[Image:Einner_P_using_inner_cut.gif | 300 px|right]]<br>
 
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After the cut on the energy deposited into inner part of electron calorimeter, number of entries decreases by 22%.<br>
 
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[[Image:Einner_over_P_using_inner_cut.gif | 200 px]]<br>
 
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Both cuts are applied<br>
 
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[[Image:Etotal_over_P_using_both_cuts.gif | 200 px]]<br>
 
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In case of using the cuts of the total deposited energy and the energy deposited into inner calorimeter number of entries decreases ~36% <br>
 
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[[Image:Einner_over_P_using_both_cuts.gif | 200 px]]<br>
 
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====summary table====
 
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==Pion==
 
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=Quality Checks=
 
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==Rates==
 
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==Asymmetries==
 

Latest revision as of 18:49, 13 January 2009

Particle Identification
Quality Checks

EG1_Teleconferences_DeltaDoverD

[Back to Delta_D_over_D]


phi angle in CM frame for different runs

some things

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