HepSim

Repository with Monte Carlo simulations for particle physics

dijetmass.py (raw text file)
# Validation script of HepMC: https://atlaswww.hep.anl.gov/hepsim/
# Run inside Jas4pp 
# S.Chekanov (ANL)
from java.awt import Color,Font
from java.lang import *
from proto import FileMC
from jhplot import  HPlot,P1D,HLabel,H1D 
from jhplot.utils import FileList
from hepsim import HepSim
from java.util import ArrayList
from hephysics.hepsim import PromcUtil
from hephysics.jet import JetN2 
from hephysics.particle import LParticle
import sys

#  anti-kT jets with min 100 GeV 
ktjet=JetN2(0.4,"antikt",100)
NMax=4 # max number of files per pT. Set to -1 to run over all files

# default location 
default_www="http://mc.hep.anl.gov/asc/hepsim/events/pp/13tev/pythia8_wh2l/"

# get data either from local file system or stream them from URL
url="" 
TotalEvents=10000 # number of events per sample 
if len(sys.argv)>1:
   if sys.argv[1].startswith("http"):
         flist=HepSim.getList(sys.argv[1])
         url=sys.argv[1]
   else: flist=FileList.get(sys.argv[1],"promc")
   if (len(sys.argv)>2): TotalEvents=int(sys.argv[2])
else:
   url=default_www; flist=HepSim.getList(url)
if len(flist)==0: print "Error: No input file!"; sys.exit(0)
else: print "Reading "+str(len(flist))+" files. Nr events= ",TotalEvents

# extract files with in certain mass ranges
"""
xmin=set()
for j in flist:
      d1=j.split("_m"); d2=d1[1].split("_")
      xmin.add(int(d2[0]))
xmin=list(xmin); xmin.sort() 
"""
xmin=HepSim.getRanges(flist,"_m","_");



# reduce range
# del xmin[-1]; del xmin[-1]; 
print "Mass ranges: ",xmin

# create file list using mass ranges 
filelist=[]
histo=[]        # m_jj mass    
crosssection=[] # keeps cross sections

n=0
for i in xmin:
     ma=[]
     for j in flist:
        if (j.find("m"+str(i)+"_")>-1): ma.append(j)
     filelist.append(ma)
     hh=H1D("M="+str(i),100,0,2000)
     hh.setColor(Color(40+n*20,20+n*10,200-5*n)) 
     histo.append( hh )  
     n=n+1

print "Total number of mass ranges=",len(filelist)
Total=len(filelist)
for ipt in range(Total):
  ptlist=filelist[ipt]
  print ipt, "Mass = "+str(xmin[ipt]) 
  cross=0; xcross=0; nev=0;  Nfiles=len(ptlist)
  if (NMax>-1):  Nfiles=NMax           # limit to NMax files 
  for m in range(Nfiles):              # loop over all files in this list    
    file=FileMC(url+ptlist[m])         # get input file
    header = file.getHeader()
    un=float(header.getMomentumUnit()) # conversion units
    lunit=float(header.getLengthUnit())
    print "Read=",url+ptlist[m]
    if (nev>TotalEvents): print "Max Nr of events are done"; break # stop after some events
    for i in range(file.size()):
      if (nev>TotalEvents): break
      nev=nev+1
      if (nev%200==0):
           if (m==0): print "Event=",nev
           else: print "Event=",nev," done=",int((100.0*m)/Nfiles),"%", 'x-cross=',xcross 
      eve = file.read(i)
      pa = eve.getParticles()    # particle information
      ve = eve.getEvent()        # event information
      pt=[] # fill electron or muon pT 
      for j in range(pa.getPxCount()):
         if (abs(pa.getPdgId(j))==11 or abs(pa.getPdgId(j))==13 ):
                p=LParticle(pa.getPx(j)/un,pa.getPy(j)/un,pa.getPz(j)/un,pa.getEnergy(j)/un,0)
                pt.append(p.perp())
      pt.sort(reverse=True) 
      if (len(pt)>0):
         if (pt[0]>60):  # look at events with 60 GeV cut on leptons
            particles=PromcUtil.getParticleDList(file.getHeader(), pa, 1, -1, 1000);
            ktjet.buildJets(particles);
            # ktjet.printJets();
            jets=ktjet.getJetsSorted()
            if (len(jets)>1): # mass of 2 leading jets 
                 ptlead1=jets[0].perp()
                 ptlead2=jets[1].perp()
                 #print "jet1=",jets[0]
                 #print "jet2=",jets[1]
                 if (abs(jets[0].phi()-jets[1].phi())>2):
                         jets[0].add(jets[1])
                         mass=jets[0].mass()
                         histo[ipt].fill(mass)

    stat = file.getStat()
    xcross=stat.getCrossSectionAccumulated()
    cross=cross+xcross;
    erro=stat.getCrossSectionErrorAccumulated();
    file.close()
  cross=cross/Nfiles
  lumi=nev/cross
  crosssection.append( histo[ipt].entries()/lumi )
  # histo[ipt].scale(1.0/lumi)   # for cross section 
  histo[ipt]=histo[ipt].getDividedByBinWidth() # get differential cross section 
  # print ipt, ") Cross section = %.3e pb"%cross, " Lumi=%.3e pb"%lumi

crossD=histo[0].sumAllBinHeights() # get total cross section 
c1 = HPlot("HepSim",600,400) # plot histogram
c1.setNameX("M_{jj} [GeV]")
# c1.setNameY("d σ / d M_{jj} [pb / GeV]")
c1.setNameY("Entries / GeV")
c1.visible(True)
c1.setAutoRange()
c1.setRangeX(0,2000)
c1.setRangeY(0,40)
c1.setMarginLeft(100)
# c1.setLogScale(1,True)
# plot for mass=4 TeV

print "Cross sections for masses [pb]"
for ipt in range(Total):
       lab="{:.1e}".format(xmin[ipt]*0.001)+" TeV "+"{:.1e} pb".format(crosssection[ipt])
       print ipt, lab
       histo[ipt].setTitle(lab)

c1.draw(histo)
# h1.toTable() 

#l1=HLabel("Pythia8   QCD σ=%.3e pb"%crossD, 0.5, 0.65, "NDC")
#l1.setFont(Font("Helvetica", Font.PLAIN, 14))
#c1.add(l1)
l2=HLabel("=HepSim=",0.85,0.84, "NDC")
l2.setFont(Font("Helvetica", Font.PLAIN, 14))
l2.setColor(Color.gray)
c1.add(l2)


# create file/image using name of the file
name="output"
if len(sys.argv[0])>0: name=sys.argv[0].replace(".py","")
from jhplot.io import HBook
file=HBook(name+".jdat","w"); print name+".jdat created"
for i in histo: file.write(i)
file.close()
c1.export(name+".svg");    print name+".svg created"
# h1.toFile(name+".txt");  print name+".txt created"
# sys.exit(0)

HEP.ANL.GOV