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>
+
[[Quality Checks]]<br>
−
[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=
+
[[EG1_Teleconferences_DeltaDoverD]]
−
==Electron==
 
  
−
=== Cuts ===
+
[[http://wiki.iac.isu.edu/index.php/Delta_D_over_D Back to Delta_D_over_D]]
  
−
==== 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.
 
  
 +
[[ phi angle in CM frame for different runs]]<br>
  
−
 
+
[[some things]]
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=====<math>EC_{tot}>0.2*p</math>=====
 
−
 
 
−
 
 
−
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>
 
−
 
 
−
[[Image:Etotal_P_using_tot_cut.gif | 200 px]]  
 
−
[[Image:Einner_P_using_tot_cut.gif | 200 px]]<br>
 
−
 
 
−
=====<math>EC_{inner}>0.08*p</math>=====
 
−
 
 
−
 
 
−
After the cut on the energy deposited into inner part of electron calorimeter, number of entries decreases by 22%.<br>
 
−
 
 
−
[[Image:Etotal_P_using_inner_cut.gif | 200 px]] [[Image:Einner_P_using_inner_cut.gif | 200 px]]<br>
 
−
 
 
−
=====Both cuts <math>  EC_{tot}>0.2*p </math> and <math> EC_{inner}>0.08*p  </math>=====
 
−
 
 
−
In case of using the cuts of the total deposited energy and the energy deposited into inner calorimeter number of entries decreases ~36% <br>
 
−
 
 
−
[[Image:Etotal_P_using_both_cuts.gif | 200 px]]
 
−
[[Image:Einner_P_using_both_cuts.gif | 200 px]]<br>
 
−
 
 
−
====summary table====
 
−
 
 
−
The "# of triggers" columns represents the number of events which generated a signal above threshold in the calorimeter and the scintillator.  The expected # of events column represents the number of reconstructed events with tracks that also make it through the cuts defined in the table.
 
−
 
 
−
The semi-inclusive analysis will focus on the 4 GeV and 6 GeV data which have both inbending and outbending torus settings.  Specifically runs 28074 - 28579 ( 4 GeV) and Runs 27356 - 27499 and 26874 - 27198 (6 GeV)
 
−
 
 
−
 
 
−
{|border="2" colspan = "20"
 
−
!Beam Energy||Torus Current||Begin Run||End Run ||file used || cuts || || || # trig(<math>10^6</math>) || expected # evts(<math>10^6</math>)||p<3,<math>EC_{tot}>0.2*p </math>,<math> EC_{inner}>0.08*p</math>(%)||p>3,<math>EC_{tot}>0.24*p </math>,<math> EC_{inner}>0.06*p</math>(%)
 
−
|-
 
−
| || || || || || <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>|| || || ||
 
−
|-
 
−
|1606||1500||25488||25559||dst25504_02.B00||64%||49.5%||78%||60||3.2
 
−
|-
 
−
|1606||1946||25560||25605|| || ||44
 
−
|-
 
−
|1606||1500||25669||25732||dst25669_02.B00||64%||49%||78%||226||10
 
−
|-
 
−
|1606||1500||25742||26221||dst25754_02.B00||21%||11%||24%||3154||13.3
 
−
|-
 
−
|1606||-1500||26222||26359||dst26224_02.B00||4.6%||3%||6.6%||703||13.1
 
−
|-
 
−
|1724||-1500||27644||27798||dst27649_02.B00||4.8%||2.2%||5.9%||211||20
 
−
|-
 
−
|1724||1500||28512||28526|| || ||159
 
−
|-
 
−
|1724||-1500||28527||28532|| || ||93
 
−
|-
 
−
|2288||1500||27205||27351||dst27225_02.B00||20.2%||13%||25.6%||1647||16.1
 
−
|-
 
−
|2562||-1500||27799||27924||dst27809_02.B00||5.7%||4.6%||8.6%||1441||13.1
 
−
|-
 
−
|2562||-1500||27942||27995||dst27942_02.B00||6.1%||4.4%||8.9%||841||32.3
 
−
|-
 
−
|2562||1500||28001||28069||dst28002_02.B00||27.8%||13%||29.6%||1013||30.7
 
−
|-
 
−
|2792||-1500||27936||27941||dst27937_02.B00||6.7%||5%||9.9%||69||20.6
 
−
|-
 
−
|3210||-2250||28549||28570|| || ||436
 
−
|-
 
−
|4239||2250||28074||28277||dst28075_02.B00||35.3%||23.9%||40.5%||2278||19.6
 
−
|-
 
−
|4239||-2250||28280||28479||dst28281_02.B00||9.1%||9.4%||13.6%||2620||15.2
 
−
|-
 
−
|4239||2250||28482||28494|| || ||7
 
−
|-
 
−
|4239||-2250||28500||28505|| || ||107
 
−
|-
 
−
|4239||2250||28506||28510||dst28509_02.B00||29.5%||22%||36%||75||18.1
 
−
|-
 
−
|5627||2250||27356||27364||dst27358_02.B00||33.2%||27.8%||41.3%||56||19.4||44.6||40.1
 
−
|-
 
−
|5627||-2250||27366||27380||dst27368_02.B00||12.6%||14.8%||19.5%||130||13.6||25.3||8.8
 
−
|-
 
−
|5627||2250||27386||27499||dst27388_02.B00||33.4%||27.8%||41.4%||1210||20.2||44.8||40.1
 
−
|-
 
−
|5627||965||27502||27617|| || ||493
 
−
|-
 
−
|5735||-2250||26874||27068||dst26904_02.B00||13%||15%||20%||1709||19.9||25.6||9.1
 
−
|-
 
−
|5735||2250||27069||27198||dst27070_02.B00||33.3%||28.8%||42.2%||1509||15||46||40.2
 
−
|-
 
−
|5764||-2250||26468||26722||dst26489_02.B00||12.2%||14.4%||19.1%||1189||10||24.6||9.3
 
−
|-
 
−
|5764||0||26723||26775|| || ||268
 
−
|-
 
−
|5764||-2250||26776||26851||dst26779_02.B00||13.5%||15.5%||20.5%||662||15.9||26.4||9.2
 
−
|}
 
−
 
 
−
====Cut on the number of photoelectrons====
 
−
 
 
−
 
 
−
In this case is used a cut on the number of photoelectrons, which is <math>nphe>2.5</math>. The plots below show the 
 
−
effect of the number of photoelectrons cuts on the Cerenkov distribution. We see that after using cut the number of entries decreases ~40.7%
 
−
<br>
 
−
 
−
[[Image:nphe_before_cut_file_27070.gif|200px]]  [[Image:nphe1_after_cut_file_27070.gif|200px]]<br>
 
−
 
 
−
 
 
−
Used cuts <math>EC_{tot}>0.24p</math> and <math>EC_{inner}>0.06p</math><br>
 
−
 
 
−
 
 
−
[[Image:nphe_before_electron_cuts_file_27070.gif|200px]]  [[Image:nphe1_after_electron_cuts_file_27070.gif|200px]]<br>
 
−
 
 
−
 
 
−
 
 
−
Used file dst28181_03(energy 4.2GeV). In this case was applied cuts on the polar angle(<math>15<\theta<20</math>) and momentum(<math>2.2<P<2.6</math>). Number of entries decreased by 96%(?????????????/)<br>
 
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−
 
 
−
[[Image:nphe_before_cuts_file_28181.gif|200px]]  [[Image:nphe1_after_cuts_file_28181.gif|200px]]<br>
 
−
 
 
−
[http://www.jlab.org/Hall-B/secure/eg1/EG2000/nevzat/UPGRADE_DST/ Tamuna: follow this link to see the OSIPENKO cuts described in part 5 add graphs of their effect below]
 
−
Dr. Forest I think I did this cuts but they do not change a lot. Maybe I am wrong.
 
−
 
 
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====Plot of <math>EC_{tot}/p</math> vs <math>EC_{inner}/p</math>====
 
−
 
 
−
In this case is used file dst27070(Energy 5.735 GeV and Torus 2250) and are applied the following EC cuts: For ECtotal - <math>EC_{tot}>0.2p</math>, for EC inner - <math>EC_{inner}>0.08p</math>.<br>
 
−
 
 
−
=====P<3=====
 
−
 
 
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After using above cuts the number of entries decreases ~46%<br>
 
−
 
 
−
[[Image:e_total_vs_e_inner1_before_cuts_file_dst27070.gif|200px]]
 
−
[[Image:e_total_vs_e_inner1_after_cuts_file_dst27070.gif|200px]]<br>
 
−
 
 
−
=====0.5<P<1=====
 
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The number of entries decreased by ~51.8%<br>
 
−
 
 
−
[[Image:e_total_vs_e_inner1_before_cuts_P1_file_dst27070.gif|200px]]
 
−
[[Image:e_total_vs_e_inner1_after_cuts_P1_file_dst27070.gif|200px]]<br>
 
−
 
 
−
=====1<P<1.5=====
 
−
 
 
−
The number of entries decreased approximately by 47.8%<br>
 
−
 
−
[[Image:e_total_vs_e_inner1_before_cuts_P1.5_file_dst27070.gif|200px]]
 
−
[[Image:e_total_vs_e_inner1_after_cuts_P1.5_file_dst27070.gif|200px]]<br>
 
−
 
 
−
=====1.5<P<2=====
 
−
 
 
−
In this case the number of entries decreased by 46.1%<br>
 
−
 
 
−
[[Image:e_total_vs_e_inner1_before_cuts_P2_file_dst27070.gif|200px]]
 
−
[[Image:e_total_vs_e_inner1_after_cuts_P2_file_dst27070.gif|200px]]<br>
 
−
 
 
−
=====2<P<2.5=====
 
−
 
 
−
In this case the number of entries decreased by 38%<br>
 
−
 
 
−
[[Image:e_total_vs_e_inner1_before_cuts_P2.5_file_dst27070.gif|200px]]
 
−
[[Image:e_total_vs_e_inner1_after_cuts_P2.5_file_dst27070.gif|200px]]<br>
 
−
 
 
−
=====P>3=====
 
−
 
 
−
Used file dst27070(Energy 5.735 GeV and Torus 2250) and are applied the following EC cuts: For ECtotal - <math>EC_{tot}>0.24p</math>, for EC inner - <math>EC_{inner}>0.06p</math>.<br>
 
−
 
 
−
The number of entries decreased by~40.2%<br>
 
−
 
 
−
[[Image:e_total_vs_e_inner1_before_cuts_P3_file_dst27070.gif|200px]]
 
−
[[Image:e_total_vs_e_inner1_after_cuts_P3_file_dst27070.gif|200px]]<br>
 
−
 
 
−
====Plot of EC_tot/P vs nphe for Electrons====
 
−
Used file dst27070(Energy 5.735 GeV and Torus 2250)<br>
 
−
=====p<3 GeV=====
 
−
The graphs below represents all electron candidates having a momentum smaller than 3 GeV.  Negatively charged pions are the most likely particle to be misidentified as an electrons by the tracking software.  A negatively charged pion having a momentum of 3 GeV would generate less than ?? photons in the cerenkov counter.  As a result the electron candidates which <math>n_{pe} < 1.xx </math> are thought to be misidentified pions.  The images which follow represent the effects of several cuts made for the purpose of removing misidentified particles.
 
−
 
 
−
[[Image:e_total_vs_nphe_momentum_cut_file_dst27070.gif|200px]]<br>
 
−
 
 
−
=====p<3 GeV and <math>EC_{inner}>0.08p</math>=====
 
−
 
 
−
[[Image:e_total_P_vs_nphe_momentum_Ec_inner_cuts_file_dst27070.gif|200px]]<br>
 
−
 
 
−
=====p<3 GeV, <math>EC_{inner}>0.08p</math> and <math>EC_{tot}>0.2p</math>=====
 
−
 
 
−
[[Image:e_total_P_vs_nphe_momentum_EC_inner_EC_total_cuts_file_dst27070.gif|200px]]<br>
 
−
 
 
−
=====p<3 GeV, <math>EC_{inner}>0.08p</math>, <math>EC_{tot}>0.2p</math> and nphe>2.5=====
 
−
 
 
−
  Dr. Forest , in this case I applied all cuts as you see.
 
−
 
 
−
[[Image:e_total_P_vs_nphe_momentum_EC_inner_EC_total_nphe_cuts_file_dst27070.gif|200px]]<br>
 
−
 
 
−
====Plot of EC_total vs EC_inner====
 
−
 
 
−
In this case file dst28181_03.B00 was used(Energy 4.2 GeV and Torus +2250). The following cuts were applied:<math>EC_{inner}>0.005</math>, <math>EC_{tot}>0.2*p</math>, ec_chi_sqr<0.1 and nphe>3.
 
−
I wanted to compare this result with<br> http://www.jlab.org/Hall-B/secure/eg1/EG2000/sharon/ec_cut_4p2gev/Final_ec_cuts/Electron_cuts.html
 
−
[[Image:Etotal_vs_Einner_file_dst28181_03_before_cuts.gif|200px]]
 
−
[[Image:Etotal_vs_Einner_file_dst28181_03_after_cuts.gif|200px]]<br>
 
−
 
 
−
 
 
−
====Raster and vertex correction====
 
−
 
 
−
 
 
−
A raster calibration and a cut on the vertex distribution was made in order to select electrons from the polarized target, also the ones scattered from other materials in the beam path. A plot of the uncorrected vertex distribution is presented below for dst27070_02.B00 file(energy=5.7GeV  Torus=2250)<br>
 
−
 
 
−
[[Image:vertex_before_corrections_dst27070_file.gif|200px]]
 
−
 
 
−
==Pion==
 
−
 
 
−
===Summary Table===
 
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−
Tamuna: 
 
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The pion id code is at:
 
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−
http://www.jlab.org/Hall-B/secure/eg1/EG2000/josh/pion.cc
 
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There are two subroutines, one which uses a constant cut for every paddle,
 
−
one that has a different cut for every paddle.  The only other requirement
 
−
is that the particle be produced with an angle less than 48 degrees in the
 
−
  lab (so as to miss the magnet can).  The requirment that the pion fail the
 
−
electron cut is not written in stone.  I still haven't checked to see the
 
−
effects of it.
 
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−
 
 
−
 
 
−
 
 
−
{|border="2" colspan = "20"
 
−
!Beam Energy||Torus Current||Begin Run||End Run ||file used || cuts || || || # trig(<math>10^6</math>) || expected # evts(<math>10^6</math>)||p>3,<math>EC_{tot}<0.2*p </math>,<math> EC_{inner}<0.08*p</math>(%)||p<3,<math>EC_{tot}<0.24*p </math>,<math> EC_{inner}<0.06*p</math>(%)
 
−
|-
 
−
| || || || || || <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>|| || || ||
 
−
|-
 
−
|1606||1500||25488||25559||dst25504_02.B00|| || || ||60||3.2
 
−
|-
 
−
|1606||1500||25669||25732||dst25669_02.B00|| || || ||226||10
 
−
|-
 
−
|1606||1500||25742||26221||dst25754_02.B00|| || || ||3154||13.3
 
−
|-
 
−
|1606||-1500||26222||26359||dst26224_02.B00|| || || ||703||13.1
 
−
|-
 
−
|1724||-1500||27644||27798||dst27649_02.B00|| || || ||211||20
 
−
|-
 
−
|2288||1500||27205||27351||dst27225_02.B00|| || || ||1647||16.1
 
−
|-
 
−
|2562||-1500||27799||27924||dst27809_02.B00|| || || ||1441||13.1
 
−
|-
 
−
|2562||-1500||27942||27995||dst27942_02.B00|| || || ||841||32.3
 
−
|-
 
−
|2562||1500||28001||28069||dst28002_02.B00|| || || ||1013||30.7
 
−
|-
 
−
|2792||-1500||27936||27941||dst27937_02.B00|| || || %||69||20.6
 
−
|-
 
−
|4239||2250||28074||28277||dst28075_02.B00|| %|| %|| %||2278||19.6
 
−
|-
 
−
|4239||-2250||28280||28479||dst28281_02.B00|| %|| %|| %||2620||15.2
 
−
|-
 
−
|4239||2250||28506||28510||dst28509_02.B00|| %|| %|| %||75||18.1
 
−
|-
 
−
|5627||2250||27356||27364||dst27358_02.B00|| %|| %|| %||56||19.4||36.1||31.5
 
−
|-
 
−
|5627||-2250||27366||27380||dst27368_02.B00|| %|| %|| %||130||13.6||25||43.8 
 
−
|-
 
−
|5627||2250||27386||27499||dst27388_02.B00|| %|| %|| %||1210||20.2||39.8||32.4 
 
−
|-
 
−
|5735||-2250||26874||27068||dst26904_02.B00|| %|| %|| %||1709||19.9||22.5||46.4 
 
−
|-
 
−
|5735||2250||27069||27198||dst27070_02.B00|| %|| %|| %||1509||15||34.6||32.9 
 
−
|-
 
−
|5764||-2250||26468||26722||dst26489_02.B00|| %|| %|| %||1189||10||25.2||44.3 
 
−
|-
 
−
|5764||-2250||26776||26851||dst26779_02.B00|| %|| %|| %||662||15.9||21.3||44
 
−
|}
 
−
 
 
−
===Table for Pions===
 
−
 
−
I used the pion id code(both subroutines):
 
−
 
 
−
http://www.jlab.org/Hall-B/secure/eg1/EG2000/josh/pion.cc
 
−
 
 
−
{|border="2" colspan = "20"
 
−
!Beam Energy||Torus Current||Begin Run||End Run ||file used || cuts || || || # trig(<math>10^6</math>) || expected # evts(<math>10^6</math>)
 
−
|-
 
−
| || || || || || first(%) || second(%)|| <math>EC_{tot}>0.2*p </math> and <math> EC_{inner}>0.08*p</math>|| ||
 
−
|-
 
−
|1606||1500||25488||25559||dst25504_02.B00||96.8||99|| ||60||3.2
 
−
|-
 
−
|1606||1500||25669||25732||dst25669_02.B00||98.1||98.9|| ||226||10
 
−
|-
 
−
|1606||1500||25742||26221||dst25754_02.B00||13.4||22.8|| ||3154||13.3
 
−
|-
 
−
|1606||-1500||26222||26359||dst26224_02.B00||11.3||15.3|| ||703||13.1
 
−
|-
 
−
|1724||-1500||27644||27798||dst27649_02.B00||15.3||18.7|| ||211||20
 
−
|-
 
−
|2288||1500||27205||27351||dst27225_02.B00||16.4||18.9|| ||1647||16.1
 
−
|-
 
−
|2562||-1500||27799||27924||dst27809_02.B00||11.1||14.2|| ||1441||13.1
 
−
|-
 
−
|2562||-1500||27942||27995||dst27942_02.B00||11.1||14.2|| ||841||32.3
 
−
|-
 
−
|2562||1500||28001||28069||dst28002_02.B00||22.4||23.1|| ||1013||30.7
 
−
|-
 
−
|2792||-1500||27936||27941||dst27937_02.B00||12.3||15.4|| %||69||20.6
 
−
|-
 
−
|4239||2250||28074||28277||dst28075_02.B00||16.7||14.3|| %||2278||19.6
 
−
|-
 
−
|4239||-2250||28280||28479||dst28281_02.B00||10.4||12.6|| %||2620||15.2
 
−
|-
 
−
|4239||2250||28506||28510||dst28509_02.B00|| %|| %|| %||75||18.1
 
−
|-
 
−
|5627||2250||27356||27364||dst27358_02.B00||40.5||40.8|| %||56||19.4
 
−
|-
 
−
|5627||-2250||27366||27380||dst27368_02.B00||9.7||12.7|| %||130||13.6 
 
−
|-
 
−
|5627||2250||27386||27499||dst27388_02.B00||14.1||15.5|| %||1210||20.2
 
−
|-
 
−
|5735||-2250||26874||27068||dst26904_02.B00||12.1||14.5|| %||1709||19.9 
 
−
|-
 
−
|5735||2250||27069||27198||dst27070_02.B00||19.5||22.9|| %||1509||15
 
−
|-
 
−
|5764||-2250||26468||26722||dst26489_02.B00||9.6||13.3|| %||1189||10
 
−
|-
 
−
|5764||-2250||26776||26851||dst26779_02.B00||10.3||13.9|| %||662||15.9
 
−
|}
 
−
 
 
−
===Plot of EC_tot/P vs nphe for Pions===
 
−
 
 
−
[[Image:e_total_vs_nphe_pions_file_dst27070.gif|200px]]
 
−
[[Image:e_total_vs_nphe_electrons_file_dst27070.gif|200px]]
 
−
 
 
−
=Quality Checks=
 
−
== Run Summary Table ==
 
−
Tamar:  Please fill in the table below using electron cuts <math>EC_{tot}>0.2*p </math> and <br><math> EC_{inner}>0.08*p</math> to estimate the expected number of events.  You will find the dst files on <br>the daq computer.
 
−
 
−
Tamuna
 
−
 
 
−
{|border="2" colspan = "20"
 
−
!Beam Energy||Torus Current||Target || Begin Run||End Run ||file used || # trig(<math>10^6</math>) || cuts% || expected # evts(<math>10^6</math>)
 
−
|-
 
−
|4239||2250||NH3 || 28205||28277||/cache/mss/home/nguler/dst/dst28205_05.B00||1108.72
 
−
|-
 
−
|||||ND3 || 28074||28190||/cache/mss/home/nguler/dst/dst28187_05.B00||1117.87
 
−
|-
 
−
|||-2250||NH3 || 28407||28479||pass1/v4/4p2out/misc/dst/dst28409_05.B00||1013.57||21.7
 
−
|-
 
−
|||||ND3 || 28278||28403||pass1/v4/4p2out/misc/dst/dst28400_05.B00||1556.04||21.9
 
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|-
 
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|5735||2250|| NH3 ||27074||27195||/cache/mss/home/nguler/dst/dst27095_05.B00||1442.25
 
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|-
 
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||||| ND3 ||27116||27170||/cache/mss/home/ngulerdst/dst27141_05.B00||624.55
 
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|-
 
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|||-2250|| NH3 ||26911||27015||/cache/mss/home/nguler/dst/dst26988.B00||900.93
 
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|-
 
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||||| ND3 ||27022||27068||p/cache/mss/home/nguler/dst/dst27055_05.B00||711.53
 
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|-
 
−
 
 
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|}
 
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==Rates==
 
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===Unpolarized Pion electroproduction===
 
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==== Rates from other experiments in our Kinematic range====
 
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==== Pion Rates -vs- Paddle for opposite sign Torus fields====
 
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Tamar:  we need to use a different runs.  Run 26904 is a C12 target and 27070 is an empty target. You need to
 
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create a histogram for the FC variable and fill it outside the most inner loop  (don't put it inside the loop over the number of particles).
 
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−
 
 
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Used file dst26904_02.B00(energy=5.7 GeV and Torus=-2250). The graphs are for <math>\pi^+</math> .  <br>
 
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[[Image:number_of_pions_vs_sc_paddle_file_dst26904_.gif|200px]]
 
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[[Image:sc_paddle_vs_momentum_file_dst26904_.gif|200px]]
 
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[[Image:momentum_file_dst26904_.gif|200px]]<br>
 
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Used file dst27070_02.B00(energy=5.7 GeV and Torus=2250).In that case they are for <math>\pi^-</math> .<br>
 
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[[Image:number_of_pions_vs_sc_paddle_file_dst27070_.gif|200px]]
 
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[[Image:sc_paddle_vs_momentum_file_dst27070_.gif|200px]]
 
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[[Image:momentum_file_dst27070_.gif|200px]]<br>
 
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Used file dst26904_02.B00(energy=5.7 GeV and Torus=-2250) for <math>\pi^-</math> .<br>
 
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[[Image:momentum_file_dst26904_particle_id_5.gif|200px]]<br>
 
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==Asymmetries==
 

Latest revision as of 18:49, 13 January 2009

Particle Identification
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EG1_Teleconferences_DeltaDoverD

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phi angle in CM frame for different runs

some things

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