Logo ROOT   6.21/01
Reference Guide
CompareMasses.C File Reference

Detailed Description

Macro to compare masses in ROOT data base to the values from pdg pdg.

The ROOT values are read in by TDatabasePDG from $ROOTSYS/etc/pdg_table.txt

a_00 10111 pdg mass 1.474000E+00 pdg err 1.900000E-02 root Mass 9.835000E-01 >> deltaM 4.905000E-01 = 33.277%
a_0+ 10211 pdg mass 1.474000E+00 pdg err 1.900000E-02 root Mass 9.835000E-01 >> deltaM 4.905000E-01 = 33.277%
#include "TDatabasePDG.h"
#include "TParticlePDG.h"
void CompareMasses()
{
TString massWidthFile = gSystem->UnixPathName(__FILE__);
massWidthFile.ReplaceAll("CompareMasses.C","mass_width_2008.mc.txt");
FILE* file = fopen(massWidthFile.Data(),"r");
if (!file){
Printf("Could not open PDG particle file %s", massWidthFile.Data());
return;
}
char c[200];
char cempty;
Int_t pdg[4];
Float_t mass, err1, err2, err;
Int_t ndiff = 0;
while (fgets(c, 200, file)) {
if (c[0] != '*' && c[0] !='W') {
//printf("%s",c);
sscanf(&c[1], "%8d", &pdg[0]);
// check emptiness
pdg[1] = 0;
for(int i = 0;i<8;i++){
sscanf(&c[9+i],"%c",&cempty);
if(cempty != ' ')sscanf(&c[9],"%8d",&pdg[1]);
}
pdg[2] = 0;
for(int i = 0;i<8;i++){
sscanf(&c[17+i],"%c",&cempty);
if(cempty != ' ')sscanf(&c[17],"%8d",&pdg[2]);
}
pdg[3] = 0;
for(int i = 0;i<8;i++){
sscanf(&c[25+i],"%c",&cempty);
if(cempty != ' ')sscanf(&c[25],"%8d",&pdg[3]);
}
sscanf(&c[35],"%14f",&mass);
sscanf(&c[50],"%8f",&err1);
sscanf(&c[50],"%8f",&err2);
err = TMath::Max((Double_t)err1,(Double_t)-1.*err2);
for(int ipdg = 0;ipdg < 4;ipdg++){
if(pdg[ipdg]==0)continue;
TParticlePDG *partRoot = TDatabasePDG::Instance()->GetParticle(pdg[ipdg]);
if(partRoot){
Float_t massRoot = partRoot->Mass();
Float_t deltaM = TMath::Abs(massRoot - mass);
// if(deltaM > err){
if (mass != 0.0 && deltaM/mass>1E-05){
ndiff++;
Printf("%10s %8d pdg mass %E pdg err %E root Mass %E >> deltaM %E = %3.3f%%",partRoot->GetName(),pdg[ipdg],mass,err,massRoot,deltaM,100.*deltaM/mass);
}
}
}
}
}// while
fclose(file);
if (ndiff == 0) Printf("Crongratulations !! All particles in ROOT and PDG have identical masses");
}
Author
Christian.Klein-Boesing

Definition in file CompareMasses.C.