HepSim

Repository with Monte Carlo simulations for particle physics

dijetmass_dm_mjj.py (raw text file)
# Validation script of HepMC: https://atlaswww.hep.anl.gov/hepsim/
# Task: reconstruct invariant mass of 2 anti-kT jets
# Comment: Run inside Jas4pp 
# author: 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

ktjet=JetN2(0.4,"antikt",20)
NMax=2 # max number of files per pT. Set to -1 to run over all files

dataset="tev13pp_mg5_dm_boson"
tag="" # only truth level
url=""
if len(sys.argv)>1:
   flist=FileList.get(sys.argv[1],"promc")
   if (len(sys.argv)>2): NMax=int(sys.argv[2])
else:
   sites=HepSim.urlRedirector(dataset)
   url=sites[0]+"/"+tag
   flist=HepSim.getList(url)
if len(flist)==0: print "Error: No input file!"; sys.exit(0)
else: print "Reading "+str(len(flist))+" files. Nr of files= ",NMax

print flist

# get list of files, splitting in masses
# xmin=HepSim.getRanges(flist,"mz_m","_");

# get list with masses
xmin=set()
for j in flist:
   if (j.endswith("promc")): 
      d1=j.split("mz_m"); 
      d2=d1[1].split(".")
      xmin.add(int(d2[0]))
xmin=list(xmin); xmin.sort() 

print "Mass ranges: ",xmin
histo=[]        # m_jj mass    
crosssection=[] # keeps cross sections

# debug
# xmin=[250]
n=0
for i in xmin:
     hh=H1D("M="+str(i),100,0,7000)
     hh.setColor(Color(40+n*20,20+n*5,215-2*n)) 
     histo.append( hh )  
     n=n+1

print "Total number of mass ranges=",len(xmin)
Total=len(xmin)
for ipt in range(len(xmin)):
  xmass=xmin[ipt]
  xfile="find this file"
  for jjj in flist:
       if (jjj.find("_m"+str(xmass)+".promc")>-1): xfile=jjj
 
  print ipt, "Mass = "+str(xmass) 
  cross=0; xcross=0; nev=0; 
  print "Read=",url+xfile
  file=FileMC(url+xfile)         # get input file
  header = file.getHeader()
  un=float(header.getMomentumUnit()) # conversion units
  lunit=float(header.getLengthUnit())
  nev=0
  for i in range(file.size()):
      nev=nev+1
      if (nev%200==0):
           print "Event=",nev
      eve = file.read(i)
      pa = eve.getParticles()    # particle information

      # are any leptons? If not, skip the event 
      NN=0
      for j in range(pa.getPxCount()):
         if (Math.abs(pa.getPdgId(j))==11 or Math.abs(pa.getPdgId(j))==13):
           p=LParticle(pa.getPx(j)/un,pa.getPy(j)/un,pa.getPz(j)/un,pa.getEnergy(j)/un,0)
           if (p.perp()>60): NN+=1
      if (NN==0): continue;  

      ve = eve.getEvent()        # event information
      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]
                 jets[0].add(jets[1])
                 mass=jets[0].mass()
                 histo[ipt].fill(mass)

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


c1 = HPlot("HepSim",600,400) # plot histogram
c1.setNameX("M_{jj} [TeV]")
# c1.setNameY("d σ / d M_{jj} [pb / GeV]")
c1.setNameY("Events")
c1.visible(True)
c1.setAutoRange()
c1.setRangeX(0,7000)
c1.setRangeY(0,3000)
c1.setMarginLeft(100)
#c1.setLogScale(1,True)
#plot for mass=4 TeV

print "Cross sections for masses [pb]"
print crosssection

for ipt in range(Total):
       xc=float(crosssection[ipt]) 
       m=float(xmin[ipt])*0.001
       print "M=",m," TeV x-section [pb]=",xc
       lab='%.1e TeV' % m 
       lab=lab+' %.1e pb' % xc
       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=",0.8,0.84, "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)

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