ww_fpmc.py (raw text file)

# HepSim script using DataMelt http://jwork.org/dmelt
# Part of =HepMC= : https://atlaswww.hep.anl.gov/asc/hepsim/
# S.Chekanov (ANL)
from java.lang import *
from proto import FileMC   # import FileMC
from jhplot.utils import FileList
from java.awt import Color,Font
from jhplot import  HPlot,P1D,HLabel,H1D
from jhplot.io import HBook
from hephysics.particle import LParticle 
from hepsim import HepSim
import sys

url="";  TotalEvents=10000
default_www="http://mc.hep.anl.gov/asc/hepsim/events/pp/8tev/ww_excl_fpmc/"
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

h1= H1D("η (W+ or W-)",20,-6,6)  
h1.setFill(True)
#h1.doc()               # check its methods

cross=0; nev=0;  Nfiles=len(flist)
for m in range(Nfiles):             # loop over all files in this list    
   file=FileMC(url+flist[m])        # get input file
   header = file.getHeader()
   un=float(header.getMomentumUnit()) # conversion units
   lunit=float(header.getLengthUnit())
   if m==0:
       print "ProMC v=",file.getVersion(), "M unit=",un,"L unit=",lunit 
   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%500==0):
           if (Nfiles==1): print "Event=",nev
           else: print "Event=",nev," done=",int((100.0*m)/Nfiles),"%"
      eve = file.read(i)
      pa = eve.getParticles()    # particle information
      #ve = eve.getEvent()       # event information
      wwp=[]
      wwm=[]
      for j in range(pa.getPxCount()): 
           if (pa.getPdgId(j)==24):  
             p=LParticle(pa.getPx(j)/un,pa.getPy(j)/un,pa.getPz(j)/un,pa.getEnergy(j)/un)
             wwp.append(p)
           if (pa.getPdgId(j)==-24):     
             p=LParticle(pa.getPx(j)/un,pa.getPy(j)/un,pa.getPz(j)/un,pa.getEnergy(j)/un)
             wwm.append(p)
      if (len(wwp)>0 and len(wwm)>0): 
              if (wwp[0].perp()>5):
                h1.fill(wwp[0].pseudoRapidity()) # W+
              if (wwm[0].perp()>5):
                h1.fill(wwm[0].pseudoRapidity()) # W+
              # break  # take only first
 
   stat = file.getStat()
   cross=stat.getCrossSectionAccumulated()
   erro=stat.getCrossSectionErrorAccumulated();
   file.close()

lumi=nev/cross;
print "Lumi=%.3e pb"%lumi
print "Total cross section (pb)=",cross
c1 = HPlot("=HepSim=",600,400)
c1.setLogScale(1,True)
c1.setMarginLeft(90)
c1.setNameX("η")
c1.setNameY("d σ / d η [pb]")
c1.visible(True)
c1.setRange(-6,6,0.00011,1)

hNew=h1.getDividedByBinWidth()
hNew.scale(1.0/lumi)
c1.draw(hNew)
# h1.toTable() 

l1=HLabel("FPMC W+W- σ=%.3e pb"%cross, 0.3, 0.75, "NDC")
l1.setFont(Font("Helvetica", Font.PLAIN, 14))
c1.add(l1)
l2=HLabel("=HepSim=",0.7,0.87, "NDC")
l2.setColor(Color.gray)
l2.setFont(Font("Helvetica", Font.PLAIN, 12))
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(hNew)
file.close()
c1.export(name+".svg");    print name+".svg created"
# xsec.toFile(name+".txt");  print name+".txt created"
# sys.exit(0)