Difference between revisions of "Analysis"

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[http://www.jlab.org/~shifeng EG1 run database ]<br>
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[[Particle Identification]]<br>
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[http://www.jlab.org/~claseg1/eg1summ.html run summary]<br>
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[[Quality Checks]]<br>
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[http://www.jlab.org/Hall-B/secure/eg1/EG2000/fersch/QUALITY_CHECKS/file_quality/runinfo.txt polarization info]<br>
 
  
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=Particle Identification=
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[[EG1_Teleconferences_DeltaDoverD]]
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==Electron==
 
  
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=== 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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==== Calorimeter based cuts====
 
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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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[[some things]]
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=====<math>EC_{tot}>0.2*p</math>=====
 
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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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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:Etotal_P_using_inner_cut.gif | 400 px|left]] [[Image:Einner_P_using_inner_cut.gif | 400 px|right]]<br>
 
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=====Both cuts <math>  EC_{tot}>0.2*p </math> and <math> EC_{inner}>0.08*p  </math>=====
 
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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:Etotal_P_using_both_cuts.gif | 400 px|left]] [[Image:Einner_P_using_both_cuts.gif | 400 px|right]]<br>
 
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====summary table====
 
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Tamuna: <br>
 
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Change the entries to be in units of Millions of Events<br>
 
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I don't understand the numbers in the num trig column.  Please write something here to describe the entries.  You need to apply all cuts in order to predict the expected number of events.
 
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{|border="2" colspan = "20"
 
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!Beam Energy||Torus Current||Begin Run||End Run ||file used || cuts || || || num trig || expected # evts
 
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| || || || || || <math>EC_{tot}>0.2*p</math> || <math>EC_{inner}>0.08*p</math>|| <math>EC_{tot}>0.2*p </math> and <math> EC_{inner}>0.08*p</math>|| ||
 
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|1606||1500||25488||25559||dst25504_02.B00||64%||49.5%||78%||60||3200806
 
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|1606||1946||25560||25605|| || ||44
 
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|1606||1500||25669||25732||dst25669_02.B00||64%||49%||78%||226||10019266
 
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|1606||1500||25742||26221||dst25754_02.B00||21%||11%||24%||3154||13283359
 
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|1606||-1500||26222||26359||dst26224_02.B00||4.6%||3%||6.6%||703||13138000
 
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|1724||-1500||27644||27798||dst27649_02.B00||4.8%||2.2%||5.9%||211||20011374
 
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|1724||1500||28512||28526|| || ||159
 
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|1724||-1500||28527||28532|| || ||93
 
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|2288||1500||27205||27351||dst27225_02.B00||20.2%||13%||25.6%||1647||16094542
 
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|2562||-1500||27799||27924||dst27809_02.B00||5.7%||4.6%||8.6%||1441||13143687
 
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|2562||-1500||27942||27995||dst27942_02.B00||6.1%||4.4%||8.9%||841||32298153
 
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|2562||1500||28001||28069||dst28002_02.B00||27.8%||13%||29.6%||1013||30739537
 
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|2792||-1500||27936||27941||dst27937_02.B00||6.7%||5%||9.9%||69||20613296
 
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|3210||-2250||28549||28570|| || ||436
 
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|4239||2250||28074||28277||dst28075_02.B00||35.3%||23.9%||40.5%||2278||19605519
 
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|4239||-2250||28280||28479||dst28281_02.B00||9.1%||9.4%||13.6%||2620||15244635
 
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|4239||2250||28482||28494|| || ||7
 
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|4239||-2250||28500||28505|| || ||107
 
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|4239||2250||28506||28510||dst28509_02.B00||29.5%||22%||36%||75||18197637
 
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|5627||2250||27356||27364||dst27358_02.B00||33.2%||27.8%||41.3%||56||19384935
 
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|5627||-2250||27366||27380||dst27368_02.B00||12.6%||14.8%||19.5%||130||13610661
 
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|5627||2250||27386||27499||dst27388_02.B00||33.4%||27.8%||41.4%||1210||20211769
 
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|5627||965||27502||27617|| || ||493
 
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|5735||-2250||26874||27068||dst26904_02.B00||13%||15%||20%||1709||19930963
 
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|5735||2250||27069||27198||dst27070_02.B00||33.3%||28.8%||42.2%||1509||15013205
 
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|5764||-2250||26468||26722||dst26489_02.B00||12.2%||14.4%||19.1%||1189||10020237
 
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|5764||0||26723||26775|| || ||268
 
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|5764||-2250||26776||26851||dst26779_02.B00||13.5%||15.5%||20.5%||662||15954736
 
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====Cut on the number of photoelectrons====
 
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In this case is used a cut on the number of photoelectrons, which is <math>nphe>2.5</math>. The plots below show the 
 
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effect of the number of photoelectrons cuts on the Cerenkov distribution. We see that after using cut the number of entries decreases ~40.7%
 
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[[Image:nphe_before_cut.gif|400px|left]]  [[Image:nphe_after_cut.gif|400px|right]]<br>
 
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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

Retrieved from "https://wiki.iac.isu.edu/index.php?title=Analysis&oldid=20689"