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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{|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%||4,148
 
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|1606||1946||25560||25605|| || ||4,148
 
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|1606||1500||25669||25732||dst25669_02.B00||64%||49%||78%||4,148
 
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|1606||1500||25742||26221||dst25754_02.B00||21%||11%||24%||4,148
 
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|1606||-1500||26222||26359||dst26224_02.B00||4.6%||3%||6.6%||4,148
 
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|1724||-1500||27644||27798||dst27649_02.B00||4.8%||2.2%||5.9%||2,362
 
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|1724||1500||28512||28526|| || ||2,362
 
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|1724||-1500||28527||28532|| || ||2,362
 
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|2288||1500||27205||27351||dst27225_02.B00||20.2%||13%||25.6%||1,631
 
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|2562||-1500||27799||27924||dst27809_02.B00||5.7%||4.6%||8.6%||3,271
 
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|2562||-1500||27942||27995||dst27942_02.B00||6.1%||4.4%||8.9%||3,271
 
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|2562||1500||28001||28069||dst28002_02.B00||27.8%||13%||29.6%||3,271
 
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|2792||-1500||27936||27941||dst27937_02.B00||6.7%||5%||9.9%||69
 
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|3210||-2250||28549||28570|| || ||202
 
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|4239||2250||28074||28277||dst28075_02.B00||35.3%||23.9%||40.5%||5,053
 
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|4239||-2250||28280||28479||dst28281_02.B00||9.1%||9.4%||13.6%||5,053
 
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|4239||2250||28482||28494|| || ||5,053
 
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|4239||-2250||28500||28505|| || ||5,053
 
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|4239||2250||28506||28510||dst28509_02.B00||29.5%||22%||36%||5,053
 
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|5627||2250||27356||27364||dst27358_02.B00||33.2%||27.8%||41.3%||1,890
 
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|5627||-2250||27366||27380||dst27368_02.B00||12.6%||14.8%||19.5%||1,890
 
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|5627||2250||27386||27499||dst27388_02.B00||33.4%||27.8%||41.4%||1,890
 
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|5627||965||27502||27617|| || ||1,890
 
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|5735||-2250||26874||27068||dst26904_02.B00||13%||15%||20%||3,220
 
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|5735||2250||27069||27198||dst27070_02.B00||33.3%||28.8%||42.2%||3,220
 
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|5764||-2250||26468||26722||dst26489_02.B00||12.2%||14.4%||19.1%||2,089
 
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|5764||0||26723||26775|| || ||2,089
 
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|5764||-2250||26776||26851||dst26779_02.B00||13.5%||15.5%||20.5%||2,089
 
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|}
 
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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

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