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ff.py
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ff.py
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import os
from scipy.special import beta as Beta
mu0 = 1
## mu0charm = 1.43
## mu0bottom = 4.3
## this is for pi+
N = {
'u+ubar': 0.345,
'd+dbar': 0.380,
'ubar' : 0.115,
's+sbar': 0.190,
'c+cbar': 0.271,
'b+bbar': 0.501,
'g': 0.279
}
alpha = {
'u+ubar': -0.015,
'd+dbar': -0.015,
'ubar' : 0.520,
's+sbar': 0.520,
'c+cbar': -0.905,
'b+bbar': -1.305,
'g': 0.899
}
beta = {
'u+ubar': 1.20,
'd+dbar': 1.20,
'ubar' : 3.27,
's+sbar': 3.27,
'c+cbar': 3.23,
'b+bbar': 5.67,
'g': 1.57
}
gamma = {
'u+ubar': 11.06,
'd+dbar': 11.06,
'ubar' : 16.26,
's+sbar': 16.26,
'c+cbar': 0.00,
'b+bbar': 0.00,
'g': 20.00
}
delta = {
'u+ubar': 4.23,
'd+dbar': 4.23,
'ubar' : 8.46,
's+sbar': 8.46,
'c+cbar': 0.00,
'b+bbar': 0.00,
'g': 4.91
}
def dss(z, flavor, charge):
i = flavor
num = N[i] * pow(z,alpha[i]) * pow(1-z,beta[i]) * \
(1+gamma[i]*pow(1-z, delta[i]))
denom = Beta(2+alpha[i], beta[i]+1) + \
gamma[i]*Beta(2+alpha[i], beta[i]+delta[i]+1)
return num/denom
def pythia(ckMin, ckMax, nevents):
"""
runs standalone Pythia to measure charged pion FFs
"""
import ROOT
pythia = ROOT.TPythia6()
## CDF Tune A for STAR
pythia.SetMSEL(1)
pythia.SetMSTP(51, 7)
pythia.SetMSTP(81, 1)
pythia.SetMSTP(82, 4)
pythia.SetPARP(67, 4.0)
pythia.SetPARP(83, 0.5)
pythia.SetPARP(84, 0.4)
pythia.SetPARP(85, 0.9)
pythia.SetPARP(86, 0.95)
pythia.SetPARP(89, 1800)
pythia.SetPARP(90, 0.25)
pythia.SetPARP(91, 1.0)
## some customizations of the gluon fragmentation
# pythia.SetMSTJ(1, 2)
# pythia.SetMSTJ(2, 4)
# pythia.SetMSTJ(3, 0)
# pythia.SetMSTJ(11, 1)
# pythia.SetPARJ(22, 1.0)
# pythia.SetPARJ(41, 0.3)
# pythia.SetPARJ(42, 0.58)
# pythia.SetPARJ(43, 0.5)
# pythia.SetPARJ(44, 0.9)
pythia.SetCKIN(3, ckMin)
pythia.SetCKIN(4, ckMax)
pythia.Initialize('CMS', 'p', 'p', 200)
hz = {
211: {
1: ROOT.TH1D('z_d_plus', '', 200, 0., 1.),
2: ROOT.TH1D('z_u_plus', '', 200, 0., 1.),
3: ROOT.TH1D('z_s_plus', '', 200, 0., 1.),
4: ROOT.TH1D('z_c_plus', '', 200, 0., 1.),
5: ROOT.TH1D('z_b_plus', '', 200, 0., 1.),
-1: ROOT.TH1D('z_dbar_plus', '', 200, 0., 1.),
-2: ROOT.TH1D('z_ubar_plus', '', 200, 0., 1.),
-3: ROOT.TH1D('z_sbar_plus', '', 200, 0., 1.),
-4: ROOT.TH1D('z_cbar_plus', '', 200, 0., 1.),
-5: ROOT.TH1D('z_bbar_plus', '', 200, 0., 1.),
21: ROOT.TH1D('z_g_plus', '', 200, 0., 1.)
},
-211: {
1: ROOT.TH1D('z_d_minus', '', 200, 0., 1.),
2: ROOT.TH1D('z_u_minus', '', 200, 0., 1.),
3: ROOT.TH1D('z_s_minus', '', 200, 0., 1.),
4: ROOT.TH1D('z_c_minus', '', 200, 0., 1.),
5: ROOT.TH1D('z_b_minus', '', 200, 0., 1.),
-1: ROOT.TH1D('z_dbar_minus', '', 200, 0., 1.),
-2: ROOT.TH1D('z_ubar_minus', '', 200, 0., 1.),
-3: ROOT.TH1D('z_sbar_minus', '', 200, 0., 1.),
-4: ROOT.TH1D('z_cbar_minus', '', 200, 0., 1.),
-5: ROOT.TH1D('z_bbar_minus', '', 200, 0., 1.),
21: ROOT.TH1D('z_g_minus', '', 200, 0., 1.)
}
}
hpt = {}
ptbins = (40, 0., 20.)
cname = {211: 'plus', -211: 'minus'}
fname = {
1:'d', 2:'u', 3:'s', 4:'c', 5:'b',
-1:'ubar', -2:'dbar', -3:'sbar', -4:'cbar', -5:'bbar',
21:'g', 'any':'any'
}
for process in (11,12,13,28,53,68):
tmp = hpt.setdefault(process, {})
for charge in (-211,211):
tmp2 = tmp.setdefault(charge, {})
for flavor in (1,2,3,4,5,-1,-2,-3,-4,-5,21,'any'):
name = 'pt_%d_%s_%s' % (process, fname[flavor], cname[charge])
hpt[process][charge][flavor] = ROOT.TH1D(name, '', *ptbins)
vectorize = lambda pythia, i: ROOT.TLorentzVector( pythia.GetP(i,1),
pythia.GetP(i,2), pythia.GetP(i,3), pythia.GetP(i,4) )
## Particle numbers are as follows:
## 1,2 protons
## 3,4 incoming partons before ISR
## 5,6 incoming partons after ISR
## 7,8 outgoing partons ... use these?
for i in range(nevents):
if i % 1000 == 0: print 'generating event', i
pythia.GenerateEvent()
nparticles = pythia.GetN()
processid = pythia.GetMSTI(1)
for i in range(9,nparticles+1):
pid = pythia.GetK(i, 2)
## select only charged pions
if abs(pid) != 211: continue
status = pythia.GetK(i, 1)
assert(status == 1)
parent = pythia.GetK(i, 3)
while parent > 8:
parent = pythia.GetK(parent, 3)
## skip pions from beam remnants, ISR
if parent not in (7,8): continue
mom = vectorize(pythia, i)
parton = vectorize(pythia, parent)
flavor = pythia.GetK(parent, 2)
z = mom.Vect().Dot(parton.Vect()) / parton.P()**2
hz[pid][flavor].Fill(z)
hpt[processid][pid][flavor].Fill(mom.Pt())
hpt[processid][pid]['any'].Fill(mom.Pt())
pythia.Pystat(1)
f = ROOT.TFile('pythia_%(ckMin)d_%(ckMax)d_%(nevents)d.root' % locals(),
'recreate')
for charge in (-211, 211):
[ h.Write() for h in hz[charge].values() ]
for process in (11,12,13,28,53,68):
[ h.Write() for h in hpt[process][charge].values() ]
f.Close()
return (hz, hpt)
def condor_ff(nevents=1E5, ckin=[2, 3, 4, 5, 7, 9, 11, 15, 25, 35, 100]):
try:
os.mkdir('out')
os.mkdir('err')
os.mkdir('log')
except OSError:
pass
## build the script that we will run -- note trick with sys.argv
f = open('job.py', 'w')
f.write('from sys import argv\n')
f.write('import analysis\n')
f.write('analysis.ff.pythia(int(argv[1]), int(argv[2]), %d)' % nevents)
## build the submit.condor file
f = open('submit.condor', 'w')
f.write('executable = /usr/bin/python\n')
f.write('getenv = True\n')
f.write('notification = Error\n')
f.write('notify_user = kocolosk@rcf.rhic.bnl.gov\n')
f.write('universe = vanilla\n')
f.write('stream_output = True\n')
f.write('stream_error = True\n')
f.write('transfer_executable = False\n\n')
## add jobs for each ckin bin
for i in range(len(ckin)-1):
sample = '%d_%d' % (ckin[i], ckin[i+1])
f.write('output = out/pythia_%s.out\n' % (sample,))
f.write('error = err/pythia_%s.err\n' % (sample,))
f.write('log = log/pythia_%s.condor.log\n' % (sample,))
f.write('arguments = %s/job.py %d %d -b\n' % (os.getcwd(), ckin[i],
ckin[i+1]))
f.write('queue\n\n')
f.close()
## and off we go
os.system('condor_submit submit.condor')