| 1 |
####################################################
|
| 2 |
###
|
| 3 |
### AWK Script to Check the Colour Conection of
|
| 4 |
### particles generated in Madgraph before
|
| 5 |
### simulation using Pythia6
|
| 6 |
###
|
| 7 |
### Alejandro Gomez Espinosa
|
| 8 |
### gomez@physics.rutgers.edu
|
| 9 |
###
|
| 10 |
### How to run: awk -f thisFile.awk input.lhe > output.lhe
|
| 11 |
###
|
| 12 |
####################################################
|
| 13 |
|
| 14 |
BEGIN{
|
| 15 |
}
|
| 16 |
/<event>/ { # Search begining of each event
|
| 17 |
linecount=-1; # To identify the particles
|
| 18 |
initialcolour11=-999; # Initial colour of the first particle (11 12)
|
| 19 |
initialcolour12=-999;
|
| 20 |
initialcolour21=-999; # Initial colour of the second particle (21 22)
|
| 21 |
initialcolour22=-999;
|
| 22 |
initialcolour1=-999; # initial colour particle to be assign
|
| 23 |
initialcolour2=-999; # initial colour ANTIparticle to be assign
|
| 24 |
mother1=0; # last mother particle of the intermediate state
|
| 25 |
mother2=0; # last mother antiparticle for the intermediate state
|
| 26 |
daughters1=0; #number of daughets of mother1
|
| 27 |
daughters2=0; #number of daughets of mother2
|
| 28 |
colourmatch=0; #number of the colour remaind for matching
|
| 29 |
checkID=0; #dummy variable
|
| 30 |
|
| 31 |
}
|
| 32 |
|
| 33 |
#Start processing event
|
| 34 |
{
|
| 35 |
#Skip the first line after event
|
| 36 |
#Check colour of initial partons
|
| 37 |
if($2==-1){ # -1 for initial state particles
|
| 38 |
if(linecount==1){
|
| 39 |
initialcolour11=$5; # Record initial value of colour
|
| 40 |
initialcolour12=$6;
|
| 41 |
}
|
| 42 |
#print initialcolour11, initialcolour12;
|
| 43 |
if(linecount==2){
|
| 44 |
initialcolour21=$5;
|
| 45 |
initialcolour22=$6;
|
| 46 |
}
|
| 47 |
#print initialcolour21, initialcolour22;
|
| 48 |
}
|
| 49 |
|
| 50 |
#Check which colour must be conserve at the end
|
| 51 |
if(initialcolour11==initialcolour22){
|
| 52 |
initialcolour1=initialcolour21;
|
| 53 |
initialcolour2=initialcolour12;
|
| 54 |
}
|
| 55 |
else if(initialcolour12==initialcolour21){
|
| 56 |
initialcolour1=initialcolour11;
|
| 57 |
initialcolour2=initialcolour22;
|
| 58 |
}
|
| 59 |
#else print "Something is wrong";
|
| 60 |
#print initialcolour1, initialcolour2;
|
| 61 |
|
| 62 |
|
| 63 |
#Check colour in intermediate particles
|
| 64 |
if($2==2){ # 2 is for intermediate particles
|
| 65 |
if($3!=$4){ # For decaying particles right after initial state
|
| 66 |
if($5!=$6){ # If the colour is the same something is wrong or if 0 we do not care about colour
|
| 67 |
if($1>0){ # For particles
|
| 68 |
mother1=linecount; # Record number of mother particle
|
| 69 |
$5=initialcolour1; # Assign colour of initial particle
|
| 70 |
$6=0;
|
| 71 |
}
|
| 72 |
else{ # Assign colour of initial ANTIparticle
|
| 73 |
mother2=linecount;
|
| 74 |
$6=initialcolour2;
|
| 75 |
$5=0;
|
| 76 |
}
|
| 77 |
}
|
| 78 |
else print "Intermediate particle does not have colour"
|
| 79 |
}
|
| 80 |
else{ # If mothers are the same, particles come from an intermediate particle
|
| 81 |
if($5!=$6){
|
| 82 |
if($1>0){
|
| 83 |
mother1=linecount; # Record number of mother particle
|
| 84 |
$5=initialcolour1; # Assign colour of inital particle
|
| 85 |
$6=0;
|
| 86 |
}
|
| 87 |
else{
|
| 88 |
mother2=linecount;
|
| 89 |
$6=initialcolour2; # Assign colour of the initial ANTIparticle
|
| 90 |
$5=0;
|
| 91 |
}
|
| 92 |
}
|
| 93 |
}
|
| 94 |
}
|
| 95 |
|
| 96 |
# "Final state" particle
|
| 97 |
else if($2==1){ # 1 for "final" state particles
|
| 98 |
#print mother1, mother2;
|
| 99 |
if($3==mother1){ # For particles which mother is a particle
|
| 100 |
daughters1++;
|
| 101 |
if(daughters1==1){ # First daughter as a particle
|
| 102 |
if($1<0) $1=-$1;
|
| 103 |
$5=initialcolour1;
|
| 104 |
$6=0;
|
| 105 |
}
|
| 106 |
if(daughters1==2){ # Second daughter as ANTIparticle
|
| 107 |
if($1>0) $1=-$1;
|
| 108 |
if($5!=0) colourmatch=$5; # Record colour number for the "untouch" particle
|
| 109 |
else colourmatch=$6;
|
| 110 |
}
|
| 111 |
#print colourmatch1;
|
| 112 |
}
|
| 113 |
if($3==mother2){ # For particles which mother is a ANTIparticle
|
| 114 |
daughters2++;
|
| 115 |
if(daughters2==1){
|
| 116 |
if($1>0) $1=-$1;
|
| 117 |
#checkID=$1; # Dummy variable, to check particle-ANTIparticle consistency
|
| 118 |
$6=initialcolour2;
|
| 119 |
$5=0;
|
| 120 |
}
|
| 121 |
if(daughters2==2){
|
| 122 |
#if($1>0 && checkID>0){ # If first is particle, second must be ANTIparticle
|
| 123 |
if($1<0) $1=-$1;
|
| 124 |
if($6!=0) $6=colourmatch; # Record colour number for the "untouch" particle
|
| 125 |
else $5=colourmatch;
|
| 126 |
}
|
| 127 |
}
|
| 128 |
}
|
| 129 |
|
| 130 |
linecount++; # Count the number of lines, i.e. check mothers
|
| 131 |
}
|
| 132 |
|
| 133 |
{
|
| 134 |
if(lineprint==0) print $0;
|
| 135 |
}
|
| 136 |
END {
|
| 137 |
}
|
