HepSim

Repository with Monte Carlo simulations for particle physics

higgs_pythia8_ptbins.py (raw text file)
# Part of =HepSim=: http://atlaswww.hep.anl.gov/hepsim/
# Jython validation script using DataMelt http://jwork.org/dmelt/ 
# S.Chekanov (ANL)

from java.awt import Color,Font
from jhplot import  HPlot,P1D,HLabel,H1D
from jhplot.io import HBook
from java.lang import *
from proto import FileMC   # import FileMC
from jhplot.utils import FileList
from hephysics.particle import LParticle 
from hepsim import HepSim
from java.util import ArrayList
from hephysics.hepsim import PromcUtil
import math,sys

NMax=5 # max number of files per pT. Set to -1 to run over all files
default_www="http://faxbox.usatlas.org/group/hepsim/events/pp/13tev/higgs_pythia8_ptbins/"

# get data either from local file system or stream them from URL
url="" 
TotalEvents=100000 # 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 pT ranges
"""
xmin=set()
xmax=set()
for j in flist:
      d1=j.split("_pt"); d2=d1[1].split("_") 
      xmin.add(int(d2[0]))
      xmax.add(int(d2[1]))
xmin=list(xmin); xmin.sort() 
xmax=list(xmax); xmax.sort()
"""
xmin=HepSim.getRanges(flist,"_pt","_");


# define histogram bins in ranges of pT, with 10% shift to avaoid biases
bins=[]
for j in xmin:
       bins.append(j+0.1*j)
print "Histogram bins:",bins 
  
filelist=[] # create file list using pT ranges 
histo=[]
for i in xmin:
     pt=[]
     for j in flist:
        if (j.find("pt"+str(i)+"_")>-1): pt.append(j)
     filelist.append(pt)
     histo.append(  H1D("Higgs pt"+str(i),bins) ) 

print "Total number of pT ranges=",len(filelist)
Total=len(filelist)
for ipt in range(Total):
  ptlist=filelist[ipt]
  print ipt, ") pT>"+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())
    if ipt==0 and m==0:
       print "ProMC v=",file.getVersion(), "M unit=",un,"L unit=",lunit
    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
      for j in range(pa.getPxCount()):
           p=LParticle(pa.getPx(j)/un,pa.getPy(j)/un,pa.getPz(j)/un,pa.getEnergy(j)/un,pa.getMass(j)/un)
           if (abs(pa.getPdgId(j))==25):   
                        histo[ipt].fill(p.perp())
                        break
 
    stat = file.getStat()
    xcross=stat.getCrossSectionAccumulated()
    cross=cross+xcross;
    erro=stat.getCrossSectionErrorAccumulated();
    file.close()
  cross=cross/Nfiles
  lumi=nev/cross
  histo[ipt].scale(1.0/lumi)   # for cross section 
  print ipt, ") Cross section = %.3e pb"%cross, " Lumi=%.3e pb"%lumi

h1=histo[0] #  combine all pT ranges 
h1.setTitle("Higgs bosons")
h1.setColor(Color.blue)
for i in range(1,len(histo)):
    h1=h1.oper(histo[i],"+")

cross=h1.sumAllBinHeights() # get total cross section 
h1=h1.getDividedByBinWidth() # get differential cross section 

c1 = HPlot("HepSim",600,400) # plot histogram
c1.setNameX("p_{T}(H^{0}) [GeV]")
c1.setNameY("d σ / d p_{T} (H^{0}) [pb / GeV]")
c1.visible(True)
c1.setMarginLeft(100)
c1.setAutoRange()
c1.setRangeX(0,6000)
c1.setRangeY(10e-18,10e+2)
c1.setLogScale(1,True)
c1.draw(h1)
# h1.toTable() 

l1=HLabel("Pythia8 H0 σ=%.3e pb"%cross, 0.55, 0.7, "NDC")
l1.setFont(Font("Helvetica", Font.PLAIN, 12))
c1.add(l1)


l2=HLabel("=HepSim=",0.65,0.84, "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","")
file=HBook(name+".jdat","w"); print name+".jdat created"
file.write(h1)
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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