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####################################################
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###
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### AWK Script to Check the Colour Conection of
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### particles generated in Madgraph before
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### simulation using Pythia6
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###
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### Alejandro Gomez Espinosa
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### gomez@physics.rutgers.edu
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###
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### How to run: awk -f thisFile.awk input.lhe > output.lhe
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###
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####################################################
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BEGIN{
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}
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/<event>/ { # Search begining of each event
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linecount=-1; # To identify the particles
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initialcolour11=-999; # Initial colour of the first particle (11 12)
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initialcolour12=-999;
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initialcolour21=-999; # Initial colour of the second particle (21 22)
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initialcolour22=-999;
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initialcolour1=-999; # initial colour particle to be assign
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initialcolour2=-999; # initial colour ANTIparticle to be assign
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mother1=0; # last mother particle of the intermediate state
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mother2=0; # last mother antiparticle for the intermediate state
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daughters1=0; #number of daughets of mother1
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daughters2=0; #number of daughets of mother2
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colourmatch=0; #number of the colour remaind for matching
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checkID=0; #dummy variable
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}
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#Start processing event
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{
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#Skip the first line after event
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#Check colour of initial partons
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if($2==-1){ # -1 for initial state particles
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if(linecount==1){
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initialcolour11=$5; # Record initial value of colour
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initialcolour12=$6;
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}
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#print initialcolour11, initialcolour12;
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if(linecount==2){
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initialcolour21=$5;
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initialcolour22=$6;
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}
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#print initialcolour21, initialcolour22;
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}
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#Check which colour must be conserve at the end
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if(initialcolour11==initialcolour22){
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initialcolour1=initialcolour21;
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initialcolour2=initialcolour12;
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}
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else if(initialcolour12==initialcolour21){
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initialcolour1=initialcolour11;
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initialcolour2=initialcolour22;
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}
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#else print "Something is wrong";
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#print initialcolour1, initialcolour2;
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#Check colour in intermediate particles
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if($2==2){ # 2 is for intermediate particles
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if($3!=$4){ # For decaying particles right after initial state
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if($5!=$6){ # If the colour is the same something is wrong or if 0 we do not care about colour
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if($1>0){ # For particles
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$5=initialcolour1; # Assign colour of initial particle
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$6=0;
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}
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else{ # Assign colour of initial ANTIparticle
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$6=initialcolour2;
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$5=0;
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}
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}
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else print "Intermediate particle does not have colour"
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}
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else{ # If mothers are the same, particles come from an intermediate particle
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if($5!=$6){
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if($1>0){
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mother1=linecount; # Record number of mother particle
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$5=initialcolour1; # Assign colour of inital particle
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$6=0;
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}
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else{
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mother2=linecount;
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$6=initialcolour2; # Assign colour of the initial ANTIparticle
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$5=0;
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}
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}
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}
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}
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# "Final state" particle
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else if($2==1){ # 1 for "final" state particles
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#print mother1, mother2;
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if($3==mother1){ # For particles which mother is a particle
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daughters1++;
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if(daughters1==1){ # First daughter as a particle
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if($1<0) $1=-$1;
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$5=initialcolour1;
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$6=0;
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}
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if(daughters1==2){ # Second daughter as ANTIparticle
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if($1>0) $1=-$1;
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if($5!=0) colourmatch=$5; # Record colour number for the "untouch" particle
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else colourmatch=$6;
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}
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#print colourmatch1;
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}
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if($3==mother2){ # For particles which mother is a ANTIparticle
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daughters2++;
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if(daughters2==1){
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if($1>0) $1=-$1;
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#checkID=$1; # Dummy variable, to check particle-ANTIparticle consistency
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$6=initialcolour2;
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$5=0;
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}
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if(daughters2==2){
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#if($1>0 && checkID>0){ # If first is particle, second must be ANTIparticle
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if($1<0) $1=-$1;
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if($6!=0) $6=colourmatch; # Record colour number for the "untouch" particle
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else $5=colourmatch;
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}
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}
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}
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linecount++; # Count the number of lines, i.e. check mothers
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}
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{
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if(lineprint==0) print $0;
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}
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END {
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}
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