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Merged
imoewi01 merged 2 commits into from
Jul 14, 2026
Merged

New Feature and a Fix Added to genr8 #404

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186198f
Added user input ranges for mass and t, and a fix to inclusive decays
edbarriga Jul 9, 2026
59ae8e3
removed the t user window inputs. couldn't make them work
edbarriga Jul 9, 2026
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183 changes: 115 additions & 68 deletions src/programs/Simulation/genr8/genr8.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@
* Use "genr8 -h" for help with options.
********************************************************
* * Generate t-channel
* genr8.c * monte carlo events.
* genr8.c * monte carlo events.
* *
********************************************************
*
Expand Down Expand Up @@ -82,10 +82,19 @@ int UseName=0;
int FIRST_EVENT=1;
int PrintFlag=10;
int WriteAscii=0;
int runNo=9000;
int RunNo=9000;
int NFinalParts=0;
unsigned int RandomSeed=0;
int UseCurrentTimeForRandomSeed = TRUE;

/*
* User-defined boundaries (set via command line flags).
* When "Use*" is FALSE the corresponding bound is not applied
* and returns to its original behavior).
*/
double UserMMin=0.0, UserMMax=0.0;
int UseUserMMin=0, UseUserMMax=0;

/***********************/
/* Declarations */
/***********************/
Expand Down Expand Up @@ -128,14 +137,16 @@ void PrintUsage(char *processName)
fprintf(stderr,"\t-n Use a particle name and not its ID number (ascii only) \n");
fprintf(stderr,"\t-M<max> Process first max events\n");
fprintf(stderr,"\t-l<lfevents> Determine the lorentz factor with this many number of events (default is 10000)\n");
fprintf(stderr,"\t-r<runNo> default runNo is 9000. \n");
fprintf(stderr,"\t-r<RunNo> default RunNo is 9000. \n");
/*fprintf(stderr,"\t-o<name> The output file \n");*/
fprintf(stderr,"\t-P save flag= 11 & 01 events(default saves 11 & 10 events) \n");
/* fprintf(stderr,"\t-R Save recoiling baryon information. \n"); */

fprintf(stderr,"\t-A<filename> Save in ascii format. \n");
fprintf(stderr,"\t-s<seed> Set random number seed to <seed>. \n");
fprintf(stderr,"\t (default is to set using current time + pid) \n");
fprintf(stderr,"\t-Mmin<M_min> Restrict generated X (isobar) mass to be >= M_min (GeV). \n");
fprintf(stderr,"\t-Mmax<M_max> Restrict generated X (isobar) mass to be <= M_max (GeV). \n");
fprintf(stderr,"\t-h Print this help message\n\n");

}
Expand Down Expand Up @@ -186,64 +197,76 @@ int main(int argc,char **argv)
}
else {

/*
* Read command line options.
*/

for (i=1; i<argc; i++) {
argptr = argv[i];
if ((*argptr == '-') && (strlen(argptr) > 1)) {
argptr++;
switch (*argptr) {
case 'd':
Debug =1;
break;
case 'h':
PrintUsage(argv[0]);
exit(0);
break;
case 'n':
UseName =1;
break;
case 'A':
WriteAscii=1;
fout = fopen(++argptr,"w");
fprintf(stderr,"Opening file %s for output. \n",argptr);
break;
case 'R':
fprintf(stderr,"Printing recoil information.\n");
PrintRecoil=1;
break;
case 'P':
fprintf(stderr,"Printing eta and pizeros and not gammas.\n");
PrintProduction=1;
break;
case 'l':
lfevents = atoi(++argptr);
fprintf(stderr,"Using %d events to determine the lorentz factor\n",lfevents);
break;
case 'M':
max = atoi(++argptr);
fprintf(stderr,"Maximum number of events: %d\n",max);
break;
case 'r':
runNo = atoi(++argptr);
fprintf(stderr,"Using runNo: %d\n",runNo);
break;
case 's':
RandomSeed = atoi(++argptr);
UseCurrentTimeForRandomSeed = FALSE;
break;
default:
fprintf(stderr,"Unrecognized argument -%s\n\n",argptr);
PrintUsage(argv[0]);
exit(-1);
break;

}
/*
* Read command line options.
*/

for (i=1; i<argc; i++) {
argptr = argv[i];
if ((*argptr == '-') && (strlen(argptr) > 1)) {
argptr++;
if (strncmp(argptr,"Mmin",4) == 0) {
UserMMin = atof(argptr+4);
UseUserMMin = 1;
fprintf(stderr,"Restricting generated X mass to be >= %lf GeV\n",UserMMin);
}
else if (strncmp(argptr,"Mmax",4) == 0) {
UserMMax = atof(argptr+4);
UseUserMMax = 1;
fprintf(stderr,"Restricting generated X mass to be <= %lf GeV\n",UserMMax);
}
else {
switch (*argptr) {
case 'd':
Debug =1;
break;
case 'h':
PrintUsage(argv[0]);
exit(0);
break;
case 'n':
UseName =1;
break;
case 'A':
WriteAscii=1;
fout = fopen(++argptr,"w");
fprintf(stderr,"Opening file %s for output. \n",argptr);
break;
case 'R':
fprintf(stderr,"Printing recoil information.\n");
PrintRecoil=1;
break;
case 'P':
fprintf(stderr,"Printing eta and pizeros and not gammas.\n");
PrintProduction=1;
break;
case 'l':
lfevents = atoi(++argptr);
fprintf(stderr,"Using %d events to determine the lorentz factor\n",lfevents);
break;
case 'M':
max = atoi(++argptr);
fprintf(stderr,"Maximum number of events: %d\n",max);
break;
case 'r':
RunNo = atoi(++argptr);
fprintf(stderr,"Using RunNo: %d\n",RunNo);
break;
case 's':
RandomSeed = atoi(++argptr);
UseCurrentTimeForRandomSeed = FALSE;
break;
default:
fprintf(stderr,"Unrecognized argument -%s\n\n",argptr);
PrintUsage(argv[0]);
exit(-1);
break;

}
}
}
}
}

/*
* Seed the random number generator.
Expand Down Expand Up @@ -525,6 +548,7 @@ int main(int argc,char **argv)
*/

do{
int mgen_tries = 0;
l0: imassc2=0;
if(!(X->width<0))
do{/*use BreitWigner--phasespace distribution */
Expand Down Expand Up @@ -557,8 +581,20 @@ l1: imassc=setChildrenMass(X->child[i]);
goto l0;
}
}

if(++mgen_tries > 1000000){
fprintf(stderr,
"Could not generate an X mass within the requested -Mmin/-Mmax window after %d tries.\n"
"The requested mass window likely does not overlap the Breit-Wigner-accessible mass "
"range for this resonance. Exiting to avoid an infinite loop.\n",
mgen_tries);
exit(-1);
}

}while((X->mass > MassHighBW) || ( X->nchildren==0 ? FALSE :
(X->mass < ( (X->child[0])->mass + (X->child[1])->mass))) );
(X->mass < ( (X->child[0])->mass + (X->child[1])->mass))) ||
(UseUserMMin && X->mass < UserMMin) ||
(UseUserMMax && X->mass > UserMMax) );

else{/* there's an error.. */
fprintf(stderr,"Cannot use a negative width!\n");
Expand Down Expand Up @@ -645,7 +681,7 @@ l2: imassc=setChildrenMass(Y->child[i]);
0.5*(t + (event_beam.mass)*(event_beam.mass) + (X->mass)*(X->mass))
)/( v3mag(&(event_beam.p.space))*X_momentum ) ;

}while(fabs(costheta)>1.0 );
}while(fabs(costheta)>1.0 );

theta = acos(costheta);
phi = randm(-1*M_PI,M_PI);
Expand Down Expand Up @@ -726,8 +762,8 @@ l2: imassc=setChildrenMass(Y->child[i]);

Nprinted =0;
/* event header information
fprintf(fout,"RunNo %d EventNo %d\n",runNo,naccepted);*/
fprintf(fout,"%d %d %d\n",runNo,naccepted, NFinalParts);
fprintf(fout,"RunNo %d EventNo %d\n",RunNo,naccepted);*/
fprintf(fout,"%d %d %d\n",RunNo,naccepted, NFinalParts);

/*
* Print out the production
Expand Down Expand Up @@ -960,10 +996,22 @@ double rawthresh(struct particleMC_t *Isobar)
rmassThresh += Isobar->child[i]->mass;
}
}else{
rmassThresh=Isobar->mass;
if(Isobar->mass <0){ /* error */
fprintf(stderr,"Error!: Isobar->mass <0 for Isobar with no children\nExit\n");
exit(-1);
if(Isobar->mass <0){
/*
* This is a final-state particle with a nonzero width that is
* being generated "inclusively" (e.g. omega, eta produced without
* their own explicit decay chain in the input file): it has no
* children of its own, so there is no daughter-mass sum to fall
* back on, and its own Breit-Wigner mass hasn't been drawn yet at
* the point this threshold is needed (see setMass()). Treat its
* threshold contribution as zero; the bookmass +/- N*width cuts
* already applied in setMass() enforce a physically sensible
* bound on its eventual mass, so this is a safe, conservative
* placeholder rather than the fatal error this used to be.
*/
rmassThresh = 0.0;
} else {
rmassThresh=Isobar->mass;
}
}
return rmassThresh;
Expand Down Expand Up @@ -1208,5 +1256,4 @@ double randm(double low, double high)
* END OF FILE *
* *
***********************
*/

*/