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====By now it is better to use DJANGOH for polarised studies as it is the more complete generator====
+
==== By now it is better to use DJANGOH for polarised studies as it is the more complete generator ====
 +
 
 
PEPSI (Polarised Electron Proton Scattering Interactions) [[#Ref1|[1]]] is a Monte Carlo generator for polarised deep inelastic scattering (pDIS). It is based on the [http://www.isv.uu.se/thep/lepto/ LEPTO] 6.5 Monte Carlo for unpolarised DIS.
 
PEPSI (Polarised Electron Proton Scattering Interactions) [[#Ref1|[1]]] is a Monte Carlo generator for polarised deep inelastic scattering (pDIS). It is based on the [http://www.isv.uu.se/thep/lepto/ LEPTO] 6.5 Monte Carlo for unpolarised DIS.
    
== PEPSI References ==
 
== PEPSI References ==
   −
<span id="Ref1">(1)</span> ''"PEPSI - a Monte Carlo generator for polarized leptoproduction"'', L. Mankiewicz, A. Schäfer and M. Veltri, Comp. Phys. Comm. '''71''', 305-318 (1992) [https://wiki.bnl.gov/eic/index.php/File:PEPSI.paper.pdf PEPSI.paper.pdf].
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<span id="Ref1">(1)</span> ''"PEPSI - a Monte Carlo generator for polarized leptoproduction"'', L. Mankiewicz, A. Schäfer and M. Veltri, Comp. Phys. Comm. '''71''', 305-318 (1992) [https://wiki.bnl.gov/eic/upload/PEPSI.paper.pdf PEPSI.paper.pdf].
   −
==Parton distribution functions==
+
== Parton distribution functions ==
   −
The distribution function to use in polarised leptoproduction is set via the variable <tt>LST(15)</tt> in the LEPTO <tt>COMMON</tt> block <tt>/LEPTOU/</tt>. [[PEPSI-pdf | Tables 1 and 2]] list internal allowed values of <tt>LST(15)</tt> for polarised and unpolarised distributions respectively.
+
The distribution function to use in polarised leptoproduction is set via the variable <tt>LST(15)</tt> in the LEPTO <tt>COMMON</tt> block <tt>/LEPTOU/</tt>. [[PEPSI-pdf|Tables 1 and 2]] list internal allowed values of <tt>LST(15)</tt> for polarised and unpolarised distributions respectively.
    
Pepsi is linked with the pdflib such all PDFs included in there can be used by setting <tt>LST(15)</tt> to the respective PDF-ID
 
Pepsi is linked with the pdflib such all PDFs included in there can be used by setting <tt>LST(15)</tt> to the respective PDF-ID
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{| class="wikitable" style="text-align:left" border="1" cellpadding="3" cellspacing="0"
 
{| class="wikitable" style="text-align:left" border="1" cellpadding="3" cellspacing="0"
 
|-
 
|-
! style="background:#ffdead;" |Subprocess  
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! style="background:#ffdead;" | Subprocess
! style="background:#ffdead;" |#  
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! style="background:#ffdead;" | #
! style="background:#ffdead;" |Description  
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! style="background:#ffdead;" | Description
 
|-
 
|-
|colspan="3" align="center" | DIRECT
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| colspan="3" align="center" | DIRECT
 
|-
 
|-
!γ∗q → q  
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! γ∗q → q
!1
+
! 1
!LO DIS
+
! LO DIS
 
|-
 
|-
!γ∗ q → qg  
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! γ∗ q → qg
!2
+
! 2
 
! QCDC
 
! QCDC
 
|-
 
|-
!γ∗ g → q qbar  
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! γ∗ g → q qbar
!3
+
! 3
 
! PGF
 
! PGF
 
|}
 
|}
QCDC: QCD-Compton, radiation of a gluon from incoming or outgoing quark lines<br>
+
 
PGF: Photon Gluon Fusion<br>
+
QCDC: QCD-Compton, radiation of a gluon from incoming or outgoing quark lines<br/>PGF: Photon Gluon Fusion
    
== Running PEPSI ==
 
== Running PEPSI ==
 +
 
the code can be found on the afs directory for EIC at BNL
 
the code can be found on the afs directory for EIC at BNL
 +
 
  "/afs/rhic.bnl.gov/eic/PACKAGES/PEPSI"
 
  "/afs/rhic.bnl.gov/eic/PACKAGES/PEPSI"
   −
this code is based on PEPSI/LEPTO and was modified to include radiative corrections using [[#Documentation on Radiative Corrections: | RadGen]].<br>
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this code is based on PEPSI/LEPTO and was modified to include radiative corrections using [[#Documentation_on_Radiative_Corrections:|RadGen]].<br/>The main program is in the same directory and called pepsiMaineRHIC_noradcorr.f / pepsiMaineRHIC_radcorr.f, several other routines are needed, which are in the same directory.<br/>The executable is in the same directory and called pepsieRHICnoRAD / pepsieRHICwithRAD<br/>There are several steer files (named: input.data. XXXXX.eic) provided in this directory to run PEPSI and get reasonable output.
The main program is in the same directory and called pepsiMaineRHIC_noradcorr.f / pepsiMaineRHIC_radcorr.f, several other routines are needed, which are in the same directory.<br>
  −
The executable is in the same directory and called pepsieRHICnoRAD / pepsieRHICwithRAD<br>
  −
There are several steer files (named: input.data. XXXXX.eic) provided in this directory to run PEPSI and get reasonable output.
      
=== How to Run the Code ===
 
=== How to Run the Code ===
====Features====
+
 
PEPSI has to be run twice if polarized asymmetries should be generated, once for parallel, lepton and proton beam spin direction, and once antiparallel.<br>
+
==== Features ====
Charge Current events can only be generated in the unpolarized mode.<br>
+
 
The LST(8) can only be used different from 0 or 1 in the unpolarised mode.
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PEPSI has to be run twice if polarized asymmetries should be generated, once for parallel, lepton and proton beam spin direction, and once antiparallel.<br/>Charge Current events can only be generated in the unpolarized mode.<br/>The LST(8) can only be used different from 0 or 1 in the unpolarised mode.
    
==== without radiative corrections ====
 
==== without radiative corrections ====
 +
 
   pepsieRHICwithRAD < input.data_noradcor.eic.pol.anti > XXX.log   
 
   pepsieRHICwithRAD < input.data_noradcor.eic.pol.anti > XXX.log   
input.data_noradcor.eic.pol.anti is one of the steer file examples in the directory to run PEPSI with settings tuned for Hermes, and/or H1 and ZEUS for the antiparallel polarized cross-section<br>
+
 
input.data_noradcor.eic.pol.par: for the parallel polarized cross-section<br>
+
input.data_noradcor.eic.pol.anti is one of the steer file examples in the directory to run PEPSI with settings tuned for Hermes, and/or H1 and ZEUS for the antiparallel polarized cross-section<br/>input.data_noradcor.eic.pol.par: for the parallel polarized cross-section<br/>input.data_noradcor.eic.unpol: for the unpolarised cross-section
input.data_noradcor.eic.unpol: for the unpolarised cross-section
      
==== with radiative corrections ====
 
==== with radiative corrections ====
* create a directory called radgen in the area you want to run the code
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* you either need to generate the lookup table for your cuts and beam energy settings first <br>
+
*create a directory called radgen in the area you want to run the code
 +
*you either need to generate the lookup table for your cuts and beam energy settings first
 +
 
 
     pepsieRHICwithRAD < input.data_make-radcor.eic.unpol
 
     pepsieRHICwithRAD < input.data_make-radcor.eic.unpol
* or you can use one of the files already generated<br>
+
 
the files are in the directory  
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*or you can use one of the files already generated
 +
 
 +
the files are in the directory
 +
 
 
   "/afs/rhic.bnl.gov/eic/PACKAGES/PEPSI/radgen"  
 
   "/afs/rhic.bnl.gov/eic/PACKAGES/PEPSI/radgen"  
 +
 
and called xytab1unp.04.050.dat or xytab1ant.04.050.dat or xytab1par.04.050.dat
 
and called xytab1unp.04.050.dat or xytab1ant.04.050.dat or xytab1par.04.050.dat
* to run the code than with radiative corrections simply change the steer file to either
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 +
*to run the code than with radiative corrections simply change the steer file to either
 +
 
 
input.data_radcor.eic.unpol or input.data_radcor.eic.pol.par or .... and
 
input.data_radcor.eic.unpol or input.data_radcor.eic.pol.par or .... and
 +
 
   type pepsieRHICwithRAD < input.data_radcor.eic.unpol > XXX.log
 
   type pepsieRHICwithRAD < input.data_radcor.eic.unpol > XXX.log
    
=== Output file structure ===
 
=== Output file structure ===
the output file is in a text format which has the following structure.<br>
+
 
* 1st line:   PEPSI EVENT FILE  
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the output file is in a text format which has the following structure.
* 2nd line: "============================================"
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<br>
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*1st line: PEPSI EVENT FILE
* 3rd line: Information on event wise variables stored in the file
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*2nd line: "============================================"
 +
 
 +
 
 +
 
 +
*3rd line: Information on event wise variables stored in the file
 +
 
 
{| class="wikitable" style="text-align:left" border="1" cellpadding="2" cellspacing="0"
 
{| class="wikitable" style="text-align:left" border="1" cellpadding="2" cellspacing="0"
| I: || 0 (line index)
  −
|-
  −
| ievent: || eventnumber running from 1 to XXX
  −
|-
  −
| genevent: || trials to generate this event
  −
|-
  −
| process: || pepsi subprocess (LST(23)), for details see table above
  −
|-
  −
| subprocess: || pythia subprocess (LST(24)), for details see table above
   
|-
 
|-
| nucleon: || hadron beam type (LST(22))            
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| I:
 +
| 0 (line index)
 +
|-
 +
| ievent:
 +
| eventnumber running from 1 to XXX
 +
|-
 +
| genevent:
 +
| trials to generate this event
 +
|-
 +
| process:
 +
| pepsi subprocess (LST(23)), for details see table above
 +
|-
 +
| subprocess:
 +
| pythia subprocess (LST(24)), for details see table above
 +
|-
 +
| nucleon:
 +
| hadron beam type (LST(22))
 +
|-
 +
| struckparton:
 +
| parton hit in the target (LST(25))
 
|-
 
|-
| struckparton: || parton hit in the target (LST(25))  
+
| partontrack:
 +
| # or parton track (LST(26))
 
|-
 
|-
| partontrack: || # or parton track (LST(26))
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| truey, trueQ2, truex, trueW2, trueNu:
|-
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| are the kinematic variables of the event.
| truey, trueQ2, truex, trueW2, trueNu: || are the kinematic variables of the event.  
   
|-
 
|-
| || If radiative corrections are turned on they are different from what is calculated from the scattered lepton.
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|  
 +
| If radiative corrections are turned on they are different from what is calculated from the scattered lepton.
 
|-
 
|-
| || If radiative corrections are turned off they are the same as what is calculated from the scattered lepton  
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|  
 +
| If radiative corrections are turned off they are the same as what is calculated from the scattered lepton
 
|-
 
|-
| mcfixedweight || weight calculated from generation limits
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| mcfixedweight
 +
| weight calculated from generation limits
 
|-
 
|-
| weight || total weight including everything
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| weight
 +
| total weight including everything
 
|-
 
|-
| dxsec || cross section included in the weight
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| dxsec
 +
| cross section included in the weight
 
|-
 
|-
| mcextraweight || Pepsi total cross section in pb from numerical integration parl(23)
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| mcextraweight
 +
| Pepsi total cross section in pb from numerical integration parl(23)
 
|-
 
|-
| dilut, F1, F2, A1, A2, R, Depol, d, eta, eps, chi || true variables needed to calculate g1
+
| dilut, F1, F2, A1, A2, R, Depol, d, eta, eps, chi
 +
| true variables needed to calculate g1
 
|-
 
|-
| gendilut, genF1, genF2, genA1, genA2, genR, genDepol, gend, geneta, geneps, genchi || variables needed to calculate g1
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| gendilut, genF1, genF2, genA1, genA2, genR, genDepol, gend, geneta, geneps, genchi
 +
| variables needed to calculate g1
 
|-
 
|-
| SigRadCor: || information used and needed in the radiative correction code  
+
| SigRadCor:
 +
| information used and needed in the radiative correction code
 
|-
 
|-
| EBrems: || energy of the radiative photon in the nuclear rest frame  
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| EBrems:
 +
| energy of the radiative photon in the nuclear rest frame
 
|-
 
|-
| nrTracks: || number of tracks in this event, includes also virtual particles
+
| nrTracks:
 +
| number of tracks in this event, includes also virtual particles
 
|}
 
|}
<br>
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* 4th line: "============================================"
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<br>
+
 
* 5th line: Information on track wise variables stored in the file
+
*4th line: "============================================"
 +
 
 +
 
 +
 
 +
*5th line: Information on track wise variables stored in the file
 +
 
 
{| class="wikitable" style="text-align:left" border="1" cellpadding="2" cellspacing="0"
 
{| class="wikitable" style="text-align:left" border="1" cellpadding="2" cellspacing="0"
| I: || line index, runs from 1 to nrTracks 
  −
|- 
  −
|K(I,1): || status code KS (1: stable particles      11: particles which decay        55; radiative photon)
   
|-
 
|-
|K(I,2): || particle KF code (211: pion, 2112:n, ....)
+
| I:
|-
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| line index, runs from 1 to nrTracks
|K(I,3): || line number of parent particle
+
|-
 +
| K(I,1):
 +
| status code KS (1: stable particles 11: particles which decay 55; radiative photon)
 +
|-
 +
| K(I,2):
 +
| particle KF code (211: pion, 2112:n, ....)
 +
|-
 +
| K(I,3):
 +
| line number of parent particle
 +
|-
 +
| K(I,4):
 +
| normally the line number of the first daughter; it is 0 for an undecayed particle or unfragmented parton
 +
|-
 +
| K(I,5):
 +
| normally the line number of the last daughter; it is 0 for an undecayed particle or unfragmented parton.
 +
|-
 +
| P(I,1):
 +
| px of particle
 +
|-
 +
| P(I,2):
 +
| py of particle
 +
|-
 +
| P(I,3):
 +
| pz of particle
 +
|-
 +
| P(I,4):
 +
| Energy of particle
 
|-
 
|-
|K(I,4): || normally the line number of the first daughter; it is 0 for an undecayed particle or unfragmented parton
+
| P(I,5):
|- 
+
| mass of particle
|K(I,5): || normally the line number of the last daughter; it is 0 for an undecayed particle or unfragmented parton.       
+
|-
|- 
+
| V(I,1):
|P(I,1): || px of particle 
+
| x vertex information
|- 
+
|-
|P(I,2): || py of particle 
+
| V(I,2):
|- 
+
| y vertex information
|P(I,3): || pz of particle
+
|-
|- 
+
| V(I,3):
|P(I,4): || Energy of particle
+
| z vertex information
|- 
  −
|P(I,5): || mass of particle
  −
|-
  −
|V(I,1): || x vertex information
  −
|-  
  −
|V(I,2): || y vertex information
  −
|-
  −
|V(I,3): || z vertex information
   
|}
 
|}
* 6th line: "============================================"
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* 7th line: event information for first event
+
*6th line: "============================================"
* 8th line: "============================================"
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*7th line: event information for first event
* 9th to X-1 line: trackwise info of 1st event
+
*8th line: "============================================"
* Xth line "=============== Event finished ==============="
+
*9th to X-1 line: trackwise info of 1st event
 +
*Xth line "=============== Event finished ==============="
    
'''the information from line 7 to X repeats for each event.'''
 
'''the information from line 7 to X repeats for each event.'''
    
=== How to analyze events ===
 
=== How to analyze events ===
* create a root tree
  −
there are root macros available to convert the output txt-files into root trees.<br>
  −
Details how to run the macros can be found [https://wiki.bnl.gov/eic/index.php/ROOT [here]]
     −
===== MC normalization (still under construction)=====
+
*create a root tree
 +
 
 +
there are root macros available to convert the output txt-files into root trees.<br/>Details how to run the macros can be found [https://wiki.bnl.gov/eic/index.php/ROOT [here]]
 +
 
 +
===== MC normalization (still under construction) =====
 +
 
 
to normalize your counts to cross section you need two informations
 
to normalize your counts to cross section you need two informations
* the total number of trials (NGEN(0,3)), it is printed to the screen/logfile if PYTHIA finishes
+
 
* the total integrated cross section (PARI(1)), the unit is microbarn (10^-6), it is printed to the screen/logfile if PYTHIA finishes
+
*the total number of trials (NGEN(0,3)), it is printed to the screen/logfile if PYTHIA finishes
 +
*the total integrated cross section (PARI(1)), the unit is microbarn (10^-6), it is printed to the screen/logfile if PYTHIA finishes
 +
 
 
  ==> count * total integrated cross section /total number of trials
 
  ==> count * total integrated cross section /total number of trials
    
to calculate the corresponding luminosity
 
to calculate the corresponding luminosity
 +
 
  ==> total number of trials/ total integrated cross section
 
  ==> total number of trials/ total integrated cross section
    
== Documentation on Radiative Corrections: ==
 
== Documentation on Radiative Corrections: ==
the code implemented in PTHIA to calculate radiative corrections is called RADGEN<br>
  −
The writeup on it can be found here [http://arXiv.org/pdf/hep-ph/9906408 [hep-ph/9906408]]<br>
  −
The following steps have been done to implement it in PYTHIA:
  −
* change the subroutine pygaga.f so it calls radgen after you have thrown y and Q2
  −
* get the true y and Q2 from radgen and the radiated photon
  −
* Pythia will continue to now generate an event based on this y and Q2
  −
* Pythia still operates under accept reject, the extra weigt from the radiative corrections is absorbed in the flux factor
      +
the code implemented in PTHIA to calculate radiative corrections is called RADGEN<br/>The writeup on it can be found here [http://arXiv.org/pdf/hep-ph/9906408 [hep-ph/9906408]]<br/>The following steps have been done to implement it in PYTHIA:
 +
 +
*change the subroutine pygaga.f so it calls radgen after you have thrown y and Q2
 +
*get the true y and Q2 from radgen and the radiated photon
 +
*Pythia will continue to now generate an event based on this y and Q2
 +
*Pythia still operates under accept reject, the extra weigt from the radiative corrections is absorbed in the flux factor
 
[[Category:Event Generators]]
 
[[Category:Event Generators]]

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