MadGraph5_aMC@NLO

LO cross section difference

Asked by FIrdaus Soberi

Dear MadGraph authors,

I'm trying to generate the following process (parton level) in my proc_card.dat. It is a vector boson scattering process where the Z decay into leptons:

set group_subprocesses Auto
set ignore_six_quark_processes False
set gauge unitary
set complex_mass_scheme False
import model SM_LM0123_UFO
define p = g u c d s u~ c~ d~ s~
define j = g u c d s u~ c~ d~ s~
define l+ = e+ mu+
define l- = e- mu-
define vl = ve vm vt
define vl~ = ve~ vm~ vt~
define l+ = e+ mu+ ta+
define l- = e- mu- ta-
generate p p > z a j j QCD=0, z > l+ l-

I was testing scale choices in MG5_aMC_v2_5_2 (versus an older one which I used, MadGraph5_v1_5_14). It gave two significantly different cross section when evaluated at fixed scale (mu=MZ). Below is what I got:
1. Cross-section : 0.01232 +- 2.809e-05 pb #MG5_aMC_v2_5_2
2. Cross-section : 0.01085 +- 1.300e-04 pb #MadGraph5_v1_5_14

That's almost ~10% difference. I used the same proc_card for the event generation, only the run_cards are different (I made sure they are equal except cases when I couldn't find similar line in aMC). Could it be that the features implemented in aMC not in Madgraph5_v1 contributed to such difference? Below are my runcards. Thanks.

edit: I generated gridpack using MG5_aMC_v2_5_2 while MadGraph5_v1_5_14 was just used to check consistency of the cross-section at fixed scale

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FIrdaus Soberi
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FIrdaus Soberi (firdaussoberi) said : 		#1

=================================================================
MG5_aMC_v2_5_2
=================================================================

#*********************************************************************
# MadGraph5_aMC@NLO *
# *
# run_card.dat MadEvent *
# *
# This file is used to set the parameters of the run. *
# *
# Some notation/conventions: *
# *
# Lines starting with a '# ' are info or comments *
# *
# mind the format: value = variable ! comment *
#*********************************************************************
#
#*******************
# Running parameters
#*******************
#
#*********************************************************************
# Tag name for the run (one word) *
#*********************************************************************
  tag_1 = run_tag ! name of the run
#*********************************************************************
# Number of events and rnd seed *
# Warning: Do not generate more than 1M events in a single run *
# If you want to run Pythia, avoid more than 50k events in a run. *
#*********************************************************************
  600 = nevents ! Number of unweighted events requested
  0 = iseed ! rnd seed (0=assigned automatically=default))
#*********************************************************************
# Collider type and energy *
# lpp: 0=No PDF, 1=proton, -1=antiproton, 2=photon from proton, *
# 3=photon from electron *
#*********************************************************************
  1 = lpp1 ! beam 1 type
  1 = lpp2 ! beam 2 type
  4000.0 = ebeam1 ! beam 1 total energy in GeV
  4000.0 = ebeam2 ! beam 2 total energy in GeV
#*********************************************************************
# Beam polarization from -100 (left-handed) to 100 (right-handed) *
#*********************************************************************
  0.0 = polbeam1 ! beam polarization for beam 1
  0.0 = polbeam2 ! beam polarization for beam 2
#*********************************************************************
# PDF CHOICE: this automatically fixes also alpha_s and its evol. *
#*********************************************************************
  cteq6l1 = pdlabel ! PDF set
  230000 = lhaid ! if pdlabel=lhapdf, this is the lhapdf number
#*********************************************************************
# Renormalization and factorization scales *
#*********************************************************************
  True = fixed_ren_scale ! if .true. use fixed ren scale
  True = fixed_fac_scale ! if .true. use fixed fac scale
  91.188 = scale ! fixed ren scale
  91.188 = dsqrt_q2fact1 ! fixed fact scale for pdf1
  91.188 = dsqrt_q2fact2 ! fixed fact scale for pdf2
  3 = dynamical_scale_choice ! Choose one of the preselected dynamical choices
  1.0 = scalefact ! scale factor for event-by-event scales
#*********************************************************************
# Type and output format
#*********************************************************************
  True = gridpack !True = setting up the grid pack
  -1.0 = time_of_flight ! threshold (in mm) below which the invariant livetime is not written (-1 means not written)
  3.0 = lhe_version ! Change the way clustering information pass to shower.
  True = clusinfo ! include clustering tag in output
  sum = event_norm ! average/sum. Normalization of the weight in the LHEF

#*********************************************************************
# Matching parameter (MLM only)
#*********************************************************************
  0 = ickkw ! 0 no matching, 1 MLM
  1.0 = alpsfact ! scale factor for QCD emission vx
  False = chcluster ! cluster only according to channel diag
  5 = asrwgtflavor ! highest quark flavor for a_s reweight
  False = auto_ptj_mjj ! Automatic setting of ptj and mjj if xqcut >0
                                   ! (turn off for VBF and single top processes)
  0.0 = xqcut ! minimum kt jet measure between partons
#*********************************************************************
#
#*********************************************************************
# handling of the helicities:
# 0: sum over all helicities
# 1: importance sampling over helicities
#*********************************************************************
  0 = nhel ! using helicities importance sampling or not.
#*********************************************************************
# Generation bias, check the wiki page below for more information: *
# 'cp3.irmp.ucl.ac.be/projects/madgraph/wiki/LOEventGenerationBias' *
#*********************************************************************
  None = bias_module ! Bias type of bias, [None, ptj_bias, -custom_folder-]
  {} = bias_parameters ! Specifies the parameters of the module.
#
#*******************************
# Parton level cuts definition *
#*******************************
#
#
#*********************************************************************
# BW cutoff (M+/-bwcutoff*Gamma) ! Define on/off-shell for "$" and decay
#*********************************************************************
  15.0 = bwcutoff ! (M+/-bwcutoff*Gamma)
#*********************************************************************
# Apply pt/E/eta/dr/mij/kt_durham cuts on decay products or not
# (note that etmiss/ptll/ptheavy/ht/sorted cuts always apply)
#*********************************************************************
  True = cut_decays ! Cut decay products
#*********************************************************************
# Standard Cuts *
#*********************************************************************
# Minimum and maximum pt's (for max, -1 means no cut) *
#*********************************************************************
  15.0 = ptj ! minimum pt for the jets
  0.0 = ptb ! minimum pt for the b
  50.0 = pta ! minimum pt for the photons
  15.0 = ptl ! minimum pt for the charged leptons
  0.0 = misset ! minimum missing Et (sum of neutrino's momenta)
  0.0 = ptheavy ! minimum pt for one heavy final state
  -1.0 = ptjmax ! maximum pt for the jets
  -1.0 = ptbmax ! maximum pt for the b
  -1.0 = ptamax ! maximum pt for the photons
  -1.0 = ptlmax ! maximum pt for the charged leptons
  -1.0 = missetmax ! maximum missing Et (sum of neutrino's momenta)
#*********************************************************************
# Minimum and maximum E's (in the center of mass frame) *
#*********************************************************************
  0.0 = ej ! minimum E for the jets
  0.0 = eb ! minimum E for the b
  0.0 = ea ! minimum E for the photons
  0.0 = el ! minimum E for the charged leptons
  -1.0 = ejmax ! maximum E for the jets
  -1.0 = ebmax ! maximum E for the b
  -1.0 = eamax ! maximum E for the photons
  -1.0 = elmax ! maximum E for the charged leptons
#*********************************************************************
# Maximum and minimum absolute rapidity (for max, -1 means no cut) *
#*********************************************************************
  10.0 = etaj ! max rap for the jets
  -1.0 = etab ! max rap for the b
  2.5 = etaa ! max rap for the photons
  5.0 = etal ! max rap for the charged leptons
  0.0 = etajmin ! min rap for the jets
  0.0 = etabmin ! min rap for the b
  0.0 = etaamin ! min rap for the photons
  0.0 = etalmin ! main rap for the charged leptons
#*********************************************************************
# Minimum and maximum DeltaR distance *
#*********************************************************************
  0.4 = drjj ! min distance between jets
  0.0 = drbb ! min distance between b's
  0.1 = drll ! min distance between leptons
  0.1 = draa ! min distance between gammas
  0.0 = drbj ! min distance between b and jet
  0.1 = draj ! min distance between gamma and jet
  0.1 = drjl ! min distance between jet and lepton
  0.0 = drab ! min distance between gamma and b
  0.0 = drbl ! min distance between b and lepton
  0.1 = dral ! min distance between gamma and lepton
  -1.0 = drjjmax ! max distance between jets
  -1.0 = drbbmax ! max distance between b's
  -1.0 = drllmax ! max distance between leptons
  -1.0 = draamax ! max distance between gammas
  -1.0 = drbjmax ! max distance between b and jet
  -1.0 = drajmax ! max distance between gamma and jet
  -1.0 = drjlmax ! max distance between jet and lepton
  -1.0 = drabmax ! max distance between gamma and b
  -1.0 = drblmax ! max distance between b and lepton
  -1.0 = dralmax ! maxdistance between gamma and lepton
#*********************************************************************
# Minimum and maximum invariant mass for pairs *
# WARNING: for four lepton final state mmll cut require to have *
# different lepton masses for each flavor! *
#*********************************************************************
  0.0 = mmjj ! min invariant mass of a jet pair
  0.0 = mmbb ! min invariant mass of a b pair
  0.0 = mmaa ! min invariant mass of gamma gamma pair
  0.0 = mmll ! min invariant mass of l+l- (same flavour) lepton pair
  -1.0 = mmjjmax ! max invariant mass of a jet pair
  -1.0 = mmbbmax ! max invariant mass of a b pair
  -1.0 = mmaamax ! max invariant mass of gamma gamma pair
  -1.0 = mmllmax ! max invariant mass of l+l- (same flavour) lepton pair
#*********************************************************************
# Minimum and maximum invariant mass for all letpons *
#*********************************************************************
  0.0 = mmnl ! min invariant mass for all letpons (l+- and vl)
  -1.0 = mmnlmax ! max invariant mass for all letpons (l+- and vl)
#*********************************************************************
# Minimum and maximum pt for 4-momenta sum of leptons *
#*********************************************************************
  0.0 = ptllmin ! Minimum pt for 4-momenta sum of leptons(l and vl)
  -1.0 = ptllmax ! Maximum pt for 4-momenta sum of leptons(l and vl)
#*********************************************************************
# Inclusive cuts *
#*********************************************************************
  0.0 = xptj ! minimum pt for at least one jet
  0.0 = xptb ! minimum pt for at least one b
  0.0 = xpta ! minimum pt for at least one photon
  0.0 = xptl ! minimum pt for at least one charged lepton
#*********************************************************************
# Control the pt's of the jets sorted by pt *
#*********************************************************************
  0.0 = ptj1min ! minimum pt for the leading jet in pt
  0.0 = ptj2min ! minimum pt for the second jet in pt
  0.0 = ptj3min ! minimum pt for the third jet in pt
  0.0 = ptj4min ! minimum pt for the fourth jet in pt
  -1.0 = ptj1max ! maximum pt for the leading jet in pt
  -1.0 = ptj2max ! maximum pt for the second jet in pt
  -1.0 = ptj3max ! maximum pt for the third jet in pt
  -1.0 = ptj4max ! maximum pt for the fourth jet in pt
  0 = cutuse ! reject event if fails any (0) / all (1) jet pt cuts
#*********************************************************************
# Control the pt's of leptons sorted by pt *
#*********************************************************************
  0.0 = ptl1min ! minimum pt for the leading lepton in pt
  0.0 = ptl2min ! minimum pt for the second lepton in pt
  0.0 = ptl3min ! minimum pt for the third lepton in pt
  0.0 = ptl4min ! minimum pt for the fourth lepton in pt
  -1.0 = ptl1max ! maximum pt for the leading lepton in pt
  -1.0 = ptl2max ! maximum pt for the second lepton in pt
  -1.0 = ptl3max ! maximum pt for the third lepton in pt
  -1.0 = ptl4max ! maximum pt for the fourth lepton in pt
#*********************************************************************
# Control the Ht(k)=Sum of k leading jets *
#*********************************************************************
  0.0 = htjmin ! minimum jet HT=Sum(jet pt)
  -1.0 = htjmax ! maximum jet HT=Sum(jet pt)
  0.0 = ihtmin !inclusive Ht for all partons (including b)
  -1.0 = ihtmax !inclusive Ht for all partons (including b)
  0.0 = ht2min ! minimum Ht for the two leading jets
  0.0 = ht3min ! minimum Ht for the three leading jets
  0.0 = ht4min ! minimum Ht for the four leading jets
  -1.0 = ht2max ! maximum Ht for the two leading jets
  -1.0 = ht3max ! maximum Ht for the three leading jets
  -1.0 = ht4max ! maximum Ht for the four leading jets
#***********************************************************************
# Photon-isolation cuts, according to hep-ph/9801442 *
# When ptgmin=0, all the other parameters are ignored *
# When ptgmin>0, pta and draj are not going to be used *
#***********************************************************************
  0.0 = ptgmin ! Min photon transverse momentum
  0.4 = r0gamma ! Radius of isolation code
  1.0 = xn ! n parameter of eq.(3.4) in hep-ph/9801442
  1.0 = epsgamma ! epsilon_gamma parameter of eq.(3.4) in hep-ph/9801442
  True = isoem ! isolate photons from EM energy (photons and leptons)
#*********************************************************************
# WBF cuts *
#*********************************************************************
  0.0 = xetamin ! minimum rapidity for two jets in the WBF case
  0.0 = deltaeta ! minimum rapidity for two jets in the WBF case
#***********************************************************************
# Turn on either the ktdurham or ptlund cut to activate *
# CKKW(L) merging with Pythia8 [arXiv:1410.3012, arXiv:1109.4829] *
#***********************************************************************
  -1.0 = ktdurham
  0.4 = dparameter
  -1.0 = ptlund
  1, 2, 3, 4, 5, 6, 21 = pdgs_for_merging_cut ! PDGs for two cuts above
#*********************************************************************
# maximal pdg code for quark to be considered as a light jet *
# (otherwise b cuts are applied) *
#*********************************************************************
  4 = maxjetflavor ! Maximum jet pdg code
#*********************************************************************
#
#*********************************************************************
# Store info for systematics studies *
# WARNING: Do not use for interference type of computation *
#*********************************************************************
  False = use_syst ! Enable systematics studies
#
#**************************************
# Parameter of the systematics study
# will be used by SysCalc (if installed)
#**************************************
#
  0.5 1 2 = sys_scalefact # factorization/renormalization scale factor
  None = sys_alpsfact # \alpha_s emission scale factors
  auto = sys_matchscale # variation of merging scale
# PDF sets and number of members (0 or none for all members).
  NNPDF23_lo_as_0130_qed = sys_pdf # list of pdf sets
# MSTW2008nlo68cl.LHgrid 1 = sys_pdf
#

=================================================================
MadGraph5_v1_5_14
=================================================================

#*********************************************************************
# MadGraph/MadEvent *
# http://madgraph.hep.uiuc.edu *
# *
# run_card.dat *
# *
# This file is used to set the parameters of the run. *
# *
# Some notation/conventions: *
# *
# Lines starting with a '# ' are info or comments *
# *
# mind the format: value = variable ! comment *
#*********************************************************************
#
#*******************
# Running parameters
#*******************
#
#*********************************************************************
# Tag name for the run (one word) *
#*********************************************************************
  tag_1 = run_tag ! name of the run
#*********************************************************************
# Run to generate the grid pack *
#*********************************************************************
  .false. = gridpack !True = setting up the grid pack
#*********************************************************************
# Number of events and rnd seed *
# Warning: Do not generate more than 1M events in a single run *
# If you want to run Pythia, avoid more than 50k events in a run. *
#*********************************************************************
  600 = nevents ! Number of unweighted events requested
      0 = iseed ! rnd seed (0=assigned automatically=default))
#*********************************************************************
# Collider type and energy *
# lpp: 0=No PDF, 1=proton, -1=antiproton, 2=photon from proton, *
# 3=photon from electron *
#*********************************************************************
        1 = lpp1 ! beam 1 type
        1 = lpp2 ! beam 2 type
     4000 = ebeam1 ! beam 1 total energy in GeV
     4000 = ebeam2 ! beam 2 total energy in GeV
#*********************************************************************
# Beam polarization from -100 (left-handed) to 100 (right-handed) *
#*********************************************************************
        0 = polbeam1 ! beam polarization for beam 1
        0 = polbeam2 ! beam polarization for beam 2
#*********************************************************************
# PDF CHOICE: this automatically fixes also alpha_s and its evol. *
#*********************************************************************
 'cteq6l1' = pdlabel ! PDF set
#*********************************************************************
# Renormalization and factorization scales *
#*********************************************************************
 T = fixed_ren_scale ! if .true. use fixed ren scale
 T = fixed_fac_scale ! if .true. use fixed fac scale
 91.1880 = scale ! fixed ren scale
 91.1880 = dsqrt_q2fact1 ! fixed fact scale for pdf1
 91.1880 = dsqrt_q2fact2 ! fixed fact scale for pdf2
 1 = scalefact ! scale factor for event-by-event scales
#*********************************************************************
# Matching - Warning! ickkw > 1 is still beta
#*********************************************************************
 0 = ickkw ! 0 no matching, 1 MLM, 2 CKKW matching
 1 = highestmult ! for ickkw=2, highest mult group
 1 = ktscheme ! for ickkw=1, 1 Durham kT, 2 Pythia pTE
 1 = alpsfact ! scale factor for QCD emission vx
 F = chcluster ! cluster only according to channel diag
 T = pdfwgt ! for ickkw=1, perform pdf reweighting
 5 = asrwgtflavor ! highest quark flavor for a_s reweight
#*********************************************************************
# Automatic ptj and mjj cuts if xqcut > 0
# (turn off for VBF and single top processes)
#**********************************************************
   F = auto_ptj_mjj ! Automatic setting of ptj and mjj
#**********************************************************
#
#**********************************
# BW cutoff (M+/-bwcutoff*Gamma)
#**********************************
  15 = bwcutoff ! (M+/-bwcutoff*Gamma)
#**********************************************************
# Apply pt/E/eta/dr/mij cuts on decay products or not
# (note that etmiss/ptll/ptheavy/ht/sorted cuts always apply)
#**********************************************************
   T = cut_decays ! Cut decay products
#*************************************************************
# Number of helicities to sum per event (0 = all helicities)
# 0 gives more stable result, but longer run time (needed for
# long decay chains e.g.).
# Use >=2 if most helicities contribute, e.g. pure QCD.
#*************************************************************
   0 = nhel ! Number of helicities used per event
#*******************
# Standard Cuts
#*******************
#
#*********************************************************************
# Minimum and maximum pt's (for max, -1 means no cut) *
#*********************************************************************
 15 = ptj ! minimum pt for the jets
  0 = ptb ! minimum pt for the b
 50 = pta ! minimum pt for the photons
 15 = ptl ! minimum pt for the charged leptons
  0 = misset ! minimum missing Et (sum of neutrino's momenta)
  0 = ptheavy ! minimum pt for one heavy final state
 1.0 = ptonium ! minimum pt for the quarkonium states
 -1 = ptjmax ! maximum pt for the jets
 -1 = ptbmax ! maximum pt for the b
 -1 = ptamax ! maximum pt for the photons
 -1 = ptlmax ! maximum pt for the charged leptons
 -1 = missetmax ! maximum missing Et (sum of neutrino's momenta)
#*********************************************************************
# Minimum and maximum E's (in the lab frame) *
#*********************************************************************
  0 = ej ! minimum E for the jets
  0 = eb ! minimum E for the b
  0 = ea ! minimum E for the photons
  0 = el ! minimum E for the charged leptons
 -1 = ejmax ! maximum E for the jets
 -1 = ebmax ! maximum E for the b
 -1 = eamax ! maximum E for the photons
 -1 = elmax ! maximum E for the charged leptons
#*********************************************************************
# Maximum and minimum absolute rapidity (for max, -1 means no cut) *
#*********************************************************************
  10 = etaj ! max rap for the jets
  -1 = etab ! max rap for the b
 2.5 = etaa ! max rap for the photons
   5 = etal ! max rap for the charged leptons
 0.6 = etaonium ! max rap for the quarkonium states
   0 = etajmin ! min rap for the jets
   0 = etabmin ! min rap for the b
   0 = etaamin ! min rap for the photons
   0 = etalmin ! main rap for the charged leptons
#*********************************************************************
# Minimum and maximum DeltaR distance *
#*********************************************************************
 0.4 = drjj ! min distance between jets
 0 = drbb ! min distance between b's
 0.1 = drll ! min distance between leptons
 0.1 = draa ! min distance between gammas
 0 = drbj ! min distance between b and jet
 0.1 = draj ! min distance between gamma and jet
 0.1 = drjl ! min distance between jet and lepton
 0 = drab ! min distance between gamma and b
 0 = drbl ! min distance between b and lepton
 0.1 = dral ! min distance between gamma and lepton
 -1 = drjjmax ! max distance between jets
 -1 = drbbmax ! max distance between b's
 -1 = drllmax ! max distance between leptons
 -1 = draamax ! max distance between gammas
 -1 = drbjmax ! max distance between b and jet
 -1 = drajmax ! max distance between gamma and jet
 -1 = drjlmax ! max distance between jet and lepton
 -1 = drabmax ! max distance between gamma and b
 -1 = drblmax ! max distance between b and lepton
 -1 = dralmax ! maxdistance between gamma and lepton
#*********************************************************************
# Minimum and maximum invariant mass for pairs *
#*********************************************************************
 0 = mmjj ! min invariant mass of a jet pair
 0 = mmbb ! min invariant mass of a b pair
 0 = mmaa ! min invariant mass of gamma gamma pair
 0 = mmll ! min invariant mass of l+l- (same flavour) lepton pair
 -1 = mmjjmax ! max invariant mass of a jet pair
 -1 = mmbbmax ! max invariant mass of a b pair
 -1 = mmaamax ! max invariant mass of gamma gamma pair
 -1 = mmllmax ! max invariant mass of l+l- (same flavour) lepton pair
#*********************************************************************
# Minimum and maximum invariant mass for all letpons *
#*********************************************************************
 0 = mmnl ! min invariant mass for all letpons (l+- and vl)
 -1 = mmnlmax ! max invariant mass for all letpons (l+- and vl)
#*********************************************************************
# Minimum and maximum pt for 4-momenta sum of leptons *
#*********************************************************************
 0 = ptllmin ! Minimum pt for 4-momenta sum of leptons(l and vl)
 -1 = ptllmax ! Maximum pt for 4-momenta sum of leptons(l and vl)
#*********************************************************************
# Inclusive cuts *
#*********************************************************************
 0 = xptj ! minimum pt for at least one jet
 0 = xptb ! minimum pt for at least one b
 0 = xpta ! minimum pt for at least one photon
 0 = xptl ! minimum pt for at least one charged lepton
#*********************************************************************
# Control the pt's of the jets sorted by pt *
#*********************************************************************
 0 = ptj1min ! minimum pt for the leading jet in pt
 0 = ptj2min ! minimum pt for the second jet in pt
 0 = ptj3min ! minimum pt for the third jet in pt
 0 = ptj4min ! minimum pt for the fourth jet in pt
 -1 = ptj1max ! maximum pt for the leading jet in pt
 -1 = ptj2max ! maximum pt for the second jet in pt
 -1 = ptj3max ! maximum pt for the third jet in pt
 -1 = ptj4max ! maximum pt for the fourth jet in pt
 0 = cutuse ! reject event if fails any (0) / all (1) jet pt cuts
#*********************************************************************
# Control the pt's of leptons sorted by pt *
#*********************************************************************
 0 = ptl1min ! minimum pt for the leading lepton in pt
 0 = ptl2min ! minimum pt for the second lepton in pt
 0 = ptl3min ! minimum pt for the third lepton in pt
 0 = ptl4min ! minimum pt for the fourth lepton in pt
 -1 = ptl1max ! maximum pt for the leading lepton in pt
 -1 = ptl2max ! maximum pt for the second lepton in pt
 -1 = ptl3max ! maximum pt for the third lepton in pt
 -1 = ptl4max ! maximum pt for the fourth lepton in pt
#*********************************************************************
# Control the Ht(k)=Sum of k leading jets *
#*********************************************************************
 0 = htjmin ! minimum jet HT=Sum(jet pt)
 -1 = htjmax ! maximum jet HT=Sum(jet pt)
 0 = ihtmin !inclusive Ht for all partons (including b)
 -1 = ihtmax !inclusive Ht for all partons (including b)
 0 = ht2min ! minimum Ht for the two leading jets
 0 = ht3min ! minimum Ht for the three leading jets
 0 = ht4min ! minimum Ht for the four leading jets
 -1 = ht2max ! maximum Ht for the two leading jets
 -1 = ht3max ! maximum Ht for the three leading jets
 -1 = ht4max ! maximum Ht for the four leading jets
#*********************************************************************
# WBF cuts *
#*********************************************************************
 0 = xetamin ! minimum rapidity for two jets in the WBF case
 0 = deltaeta ! minimum rapidity for two jets in the WBF case
#*********************************************************************
# maximal pdg code for quark to be considered as a light jet *
# (otherwise b cuts are applied) *
#*********************************************************************
 4 = maxjetflavor ! Maximum jet pdg code
#*********************************************************************
# Jet measure cuts *
#*********************************************************************
 0 = xqcut ! minimum kt jet measure between partons
#*********************************************************************

Revision history for this message
FIrdaus Soberi (firdaussoberi) said : 		#2

Oh and this is using the dim-8 operators AnomalousGaugeCoupling model in FeynRules.
Below is my param_card.dat

=================================================================
MG5_aMC_v2_5_2
=================================================================
######################################################################
## PARAM_CARD AUTOMATICALY GENERATED BY MG5 FOLLOWING UFO MODEL ####
######################################################################
## ##
## Width set on Auto will be computed following the information ##
## present in the decay.py files of the model. ##
## See arXiv:1402.1178 for more details. ##
## ##
######################################################################

###################################
## INFORMATION FOR ANOINPUTS
###################################
Block anoinputs
    1 0.000000e+00 # FS0
    2 0.000000e+00 # FS1
    3 1.500000e-10 # FM0
    4 0.000000e+00 # FM1
    5 0.000000e+00 # FM2
    6 0.000000e+00 # FM3
    7 0.000000e+00 # FM4
    8 0.000000e+00 # FM5
    9 0.000000e+00 # FM6
   10 0.000000e+00 # FM7
   11 0.000000e+00 # FT0
   12 0.000000e+00 # FT1
   13 0.000000e+00 # FT2
   14 0.000000e+00 # FT3
   15 0.000000e+00 # FT4
   16 0.000000e+00 # FT5
   17 0.000000e+00 # FT6
   18 0.000000e+00 # FT7
   19 0.000000e+00 # FT8
   20 0.000000e+00 # FT9

###################################
## INFORMATION FOR CKMBLOCK
###################################
Block ckmblock
    1 2.277360e-01 # cabi

###################################
## INFORMATION FOR MASS
###################################
Block mass
    5 4.700000e+00 # MB
    6 1.720000e+02 # MT
   15 1.777000e+00 # MTA
   23 9.118760e+01 # MZ
   25 1.250000e+02 # MH
## Dependent parameters, given by model restrictions.
## Those values should be edited following the
## analytical expression. MG5 ignores those values
## but they are important for interfacing the output of MG5
## to external program such as Pythia.
  1 0.000000 # d : 0.0
  2 0.000000 # u : 0.0
  3 0.000000 # s : 0.0
  4 0.000000 # c : 0.0
  11 0.000000 # e- : 0.0
  12 0.000000 # ve : 0.0
  13 0.000000 # mu- : 0.0
  14 0.000000 # vm : 0.0
  16 0.000000 # vt : 0.0
  21 0.000000 # g : 0.0
  22 0.000000 # a : 0.0
  24 79.824360 # w+ : cmath.sqrt(MZ__exp__2/2. + cmath.sqrt(MZ__exp__4/4. - (aEW*cmath.pi*MZ__exp__2)/(Gf*sqrt__2)))

###################################
## INFORMATION FOR SMINPUTS
###################################
Block sminputs
    1 1.279000e+02 # aEWM1
    2 1.166370e-05 # Gf
    3 1.184000e-01 # aS

###################################
## INFORMATION FOR YUKAWA
###################################
Block yukawa
    5 4.700000e+00 # ymb
    6 1.720000e+02 # ymt
   15 1.777000e+00 # ymtau

###################################
## INFORMATION FOR DECAY
###################################
DECAY 6 1.508336e+00 # WT
DECAY 23 2.495200e+00 # WZ
DECAY 24 2.085000e+00 # WW
DECAY 25 5.753088e-03 # WH
## Dependent parameters, given by model restrictions.
## Those values should be edited following the
## analytical expression. MG5 ignores those values
## but they are important for interfacing the output of MG5
## to external program such as Pythia.
DECAY 1 0.000000 # d : 0.0
DECAY 2 0.000000 # u : 0.0
DECAY 3 0.000000 # s : 0.0
DECAY 4 0.000000 # c : 0.0
DECAY 5 0.000000 # b : 0.0
DECAY 11 0.000000 # e- : 0.0
DECAY 12 0.000000 # ve : 0.0
DECAY 13 0.000000 # mu- : 0.0
DECAY 14 0.000000 # vm : 0.0
DECAY 15 0.000000 # ta- : 0.0
DECAY 16 0.000000 # vt : 0.0
DECAY 21 0.000000 # g : 0.0
DECAY 22 0.000000 # a : 0.0

=================================================================
MadGraph5_v1_5_14
=================================================================
######################################################################
## PARAM_CARD AUTOMATICALY GENERATED BY MG5 FOLLOWING UFO MODEL ####
######################################################################
## ##
## Width set on Auto will be computed following the information ##
## present in the decay.py files of the model. By default, ##
## this is only 1->2 decay modes. ##
## ##
######################################################################

###################################
## INFORMATION FOR ANOINPUTS
###################################
Block anoinputs
    1 0.000000e+00 # FS0
    2 0.000000e+00 # FS1
    3 1.500000e-10 # FM0
    4 0.000000e+00 # FM1
    5 0.000000e+00 # FM2
    6 0.000000e+00 # FM3
    7 0.000000e+00 # FM4
    8 0.000000e+00 # FM5
    9 0.000000e+00 # FM6
   10 0.000000e+00 # FM7
   11 0.000000e+00 # FT0
   12 0.000000e+00 # FT1
   13 0.000000e+00 # FT2
   14 0.000000e+00 # FT3
   15 0.000000e+00 # FT4
   16 0.000000e+00 # FT5
   17 0.000000e+00 # FT6
   18 0.000000e+00 # FT7
   19 0.000000e+00 # FT8
   20 0.000000e+00 # FT9

###################################
## INFORMATION FOR CKMBLOCK
###################################
Block ckmblock
    1 2.277360e-01 # cabi

###################################
## INFORMATION FOR MASS
###################################
Block mass
    5 4.200000e+00 # MB
    6 1.725000e+02 # MT
   15 1.777000e+00 # MTA
   23 9.118760e+01 # MZ
   25 1.260000e+02 # MH
## Dependent parameters, given by model restrictions.
## Those values should be edited following the
## analytical expression. MG5 ignores those values
## but they are important for interfacing the output of MG5
## to external program such as Pythia.
  1 0.000000 # d : 0.0
  2 0.000000 # u : 0.0
  3 0.000000 # s : 0.0
  4 0.000000 # c : 0.0
  11 0.000000 # e- : 0.0
  12 0.000000 # ve : 0.0
  13 0.000000 # mu- : 0.0
  14 0.000000 # vm : 0.0
  16 0.000000 # vt : 0.0
  21 0.000000 # g : 0.0
  22 0.000000 # a : 0.0
  24 79.824360 # w+ : cmath.sqrt(MZ__exp__2/2. + cmath.sqrt(MZ__exp__4/4. - (aEW*cmath.pi*MZ__exp__2)/(Gf*sqrt__2)))

###################################
## INFORMATION FOR SMINPUTS
###################################
Block sminputs
    1 1.279000e+02 # aEWM1
    2 1.166370e-05 # Gf
    3 1.184000e-01 # aS

###################################
## INFORMATION FOR YUKAWA
###################################
Block yukawa
    5 4.700000e+00 # ymb
    6 1.720000e+02 # ymt
   15 1.777000e+00 # ymtau

###################################
## INFORMATION FOR DECAY
###################################
DECAY 6 1.508336e+00 # WT
DECAY 23 2.495200e+00 # WZ
DECAY 24 2.085000e+00 # WW
DECAY 25 5.753088e-03 # WH
## Dependent parameters, given by model restrictions.
## Those values should be edited following the
## analytical expression. MG5 ignores those values
## but they are important for interfacing the output of MG5
## to external program such as Pythia.
DECAY 1 0.000000 # d : 0.0
DECAY 2 0.000000 # u : 0.0
DECAY 3 0.000000 # s : 0.0
DECAY 4 0.000000 # c : 0.0
DECAY 5 0.000000 # b : 0.0
DECAY 11 0.000000 # e- : 0.0
DECAY 12 0.000000 # ve : 0.0
DECAY 13 0.000000 # mu- : 0.0
DECAY 14 0.000000 # vm : 0.0
DECAY 15 0.000000 # ta- : 0.0
DECAY 16 0.000000 # vt : 0.0
DECAY 21 0.000000 # g : 0.0
DECAY 22 0.000000 # a : 0.0

They look exactly the same, except the block mass is different.

Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said : 		#3

Hi,

I checked this process with the same run_card and param_card but in the sm.
(Note that you can use the run_card of 1.5.14 directly in the 2.5.2 version of the code, you do not have to have two different one.)

for 1.5.14, I get:
  === Results Summary for run: run_01 tag: tag_1 ===

     Cross-section : 0.003491 +- 2.92e-05 pb
     Nb of events : 600

for 2.5.2
  === Results Summary for run: run_01 tag: tag_1 ===

     Cross-section : 0.003508 +- 3.624e-05 pb
     Nb of events : 600
#***************************************************************************
#
# original cross-section: 0.00350803776
# scale variation: +6.49% -5.8%
# central scheme variation: + 0% -18.2%
#
#PDF NNPDF23_lo_as_0130_qed: 0.00343569 +4.06% -4.06%
# dynamical scheme # 1 : 0.0030474 +5.51% -5.02% # \sum ET
# dynamical scheme # 2 : 0.0030474 +5.51% -5.02% # \sum\sqrt{m^2+pt^2}
# dynamical scheme # 3 : 0.00321544 +5.75% -5.23% # 0.5 \sum\sqrt{m^2+pt^2}
# dynamical scheme # 4 : 0.00286861 +5.03% -4.63% # \sqrt{\hat s}

I did not checked with your model, but
1) The above test shows that no bug was introduced for this process.
2) from your result, it looks like 1.5.14 has some problem to have an accurate cross-section.
(the error is one order of magnitude higher than in 2.5.2). Did you suceed to get the number of event that you asked for?
(Especially if you ask more than 10k events?)

Cheers,

Olivier

Revision history for this message
FIrdaus Soberi (firdaussoberi) said : 		#4

Hi Olivier,

Thanks for the quick reply. Yes, I didn't think there is any bug too but I'm trying to understand where the difference comes from.
With 1.5.14 I didn't manage to get the full nevents requested with something like 6k (this happens with some operator like FM0 etc). Even smaller nevents like 600 I still got problem sometimes (but mostly it is fine) to get full nevents. For now, I resorted to smaller nevents and large runs to get enough stats.

If I use the same runcard from 1.5.14 for 2.5.2, can I add dynamical_scale_choice line in the runcard? In that case I can use the same definition in setscales.f of 2.5.2 right?

Best regards,
Firdaus

Revision history for this message
FIrdaus Soberi (firdaussoberi) said : 		#5

Hi Olivier,

For some reason I found that gridpack gives a slighly higher cross-section than when it is false (in model SM_LM0123_UFO) . It also took a lot longer to run (~2-3hr/run) vs. when false (~10mins/run).

I did a quick run in 2.5.2 and found (with gridpack=False):
  === Results Summary for run: run_17 tag: tag_1 ===

     Cross-section : 0.0109 +- 0.000139 pb
     Nb of events : 600

which is close to what I expect comparing with 1.5.14 (the error is also same order of magnitude as 1.5.14 now).

In 1.5.14, with gridpack=.true. :
$cat ./Events/run_11/run_11_tag_1_banner.txt
<MGGenerationInfo>
# Number of Events : 441
# Integrated weight (pb) : 0.0121816451037
</MGGenerationInfo>

$cat./Events/run_12/run_12_tag_1_banner.txt
<MGGenerationInfo>
# Number of Events : 327
# Integrated weight (pb) : 0.0122801413368
</MGGenerationInfo>

$cat./Events/run_14/run_14_tag_1_banner.txt
<MGGenerationInfo>
# Number of Events : 600
# Integrated weight (pb) : 0.0122501701843
</MGGenerationInfo>

which is around what was given in 2.5.2 (it is harder to get full nevents now when I generate gridpack even with small nevent like 600, but at least the xsection doesn't change much).

In this case, why is the gridpack cross section higher than the local run in which it is false? Shouldn't both be the same? I'd really appreciate any clue on this.

##Also, regarding my previous follow-up question. I used the runcard from 1.5.14 for 2.5.2 and it runs fine, but I noticed the other arguments are not ignored but set to default instead.
run_card missed argument clusinfo. Takes default: True
run_card missed argument lhe_version. Takes default: 3.0
run_card missed argument ptgmin. Takes default: 0.0
run_card missed argument r0gamma. Takes default: 0.4
run_card missed argument xn. Takes default: 1.0
run_card missed argument epsgamma. Takes default: 1.0
run_card missed argument isoem. Takes default: True
run_card missed argument ktdurham. Takes default: -1.0
run_card missed argument dparameter. Takes default: 0.4
run_card missed argument ptlund. Takes default: -1.0
run_card missed argument pdgs_for_merging_cut. Takes default: [21, 1, 2, 3, 4, 5, 6]
run_card missed argument use_syst. Takes default: True
run_card missed argument bias_parameters. Takes default: {}

Thanks!
Regards,
Firdaus Soberi

Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said : 		#6

Hi,

What is happening is that our phase-space integrator has trouble to correctly converge trough the (correct) value.
This is the reason why you do not get the expected number of events.
Note that with gridpack=.true. we do not try to generate the number of events written in the run_card since this is not the point of the gridpack.
The point is to have an optimised code which can then generate events in a single core (i.e. a code bypassing all the initialisation).

This is the reason why this is so slow (especially in gridpack) since it has trouble to integrate correctly and is force to run up to the maximum allowed time.

Gridpack use a more conservative way to probe the phase-space (basically more points by iteration and more iteration). They should indeed be identical but this shows that indeed you face phase-space integration problem.
This is not in itself that surprising for dimension 8 operator since our phase-space integrator is designed to be driven by three point interaction.

> ##Also, regarding my previous follow-up question. I used the runcard from 1.5.14 for 2.5.2 and it runs fine, but I noticed the other arguments are not ignored but set to default instead.

Well I have to set them to a given value. I default to a value which is the one needed such that I have the same cross-section that in the case where they are not defined.

Cheers,

Olivier

> On 9 Mar 2017, at 12:58, FIrdaus Soberi <email address hidden> wrote:
>
> Question #536827 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/536827
>
> FIrdaus Soberi posted a new comment:
> Hi Olivier,
>
> For some reason I found that gridpack gives a slighly higher cross-
> section than when it is false (in model SM_LM0123_UFO) . It also took a
> lot longer to run (~2-3hr/run) vs. when false (~10mins/run).
>
> I did a quick run in 2.5.2 and found (with gridpack=False):
> === Results Summary for run: run_17 tag: tag_1 ===
>
> Cross-section : 0.0109 +- 0.000139 pb
> Nb of events : 600
>
> which is close to what I expect comparing with 1.5.14 (the error is also
> same order of magnitude as 1.5.14 now).
>
> In 1.5.14, with gridpack=.true. :
> $cat ./Events/run_11/run_11_tag_1_banner.txt
> <MGGenerationInfo>
> # Number of Events : 441
> # Integrated weight (pb) : 0.0121816451037
> </MGGenerationInfo>
>
> $cat./Events/run_12/run_12_tag_1_banner.txt
> <MGGenerationInfo>
> # Number of Events : 327
> # Integrated weight (pb) : 0.0122801413368
> </MGGenerationInfo>
>
> $cat./Events/run_14/run_14_tag_1_banner.txt
> <MGGenerationInfo>
> # Number of Events : 600
> # Integrated weight (pb) : 0.0122501701843
> </MGGenerationInfo>
>
> which is around what was given in 2.5.2 (it is harder to get full
> nevents now when I generate gridpack even with small nevent like 600,
> but at least the xsection doesn't change much).
>
> In this case, why is the gridpack cross section higher than the local
> run in which it is false? Shouldn't both be the same? I'd really
> appreciate any clue on this.
>
> ##Also, regarding my previous follow-up question. I used the runcard from 1.5.14 for 2.5.2 and it runs fine, but I noticed the other arguments are not ignored but set to default instead.
> run_card missed argument clusinfo. Takes default: True
> run_card missed argument lhe_version. Takes default: 3.0
> run_card missed argument ptgmin. Takes default: 0.0
> run_card missed argument r0gamma. Takes default: 0.4
> run_card missed argument xn. Takes default: 1.0
> run_card missed argument epsgamma. Takes default: 1.0
> run_card missed argument isoem. Takes default: True
> run_card missed argument ktdurham. Takes default: -1.0
> run_card missed argument dparameter. Takes default: 0.4
> run_card missed argument ptlund. Takes default: -1.0
> run_card missed argument pdgs_for_merging_cut. Takes default: [21, 1, 2, 3, 4, 5, 6]
> run_card missed argument use_syst. Takes default: True
> run_card missed argument bias_parameters. Takes default: {}
>
> Thanks!
> Regards,
> Firdaus Soberi
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
FIrdaus Soberi (firdaussoberi) said : 		#7

Hi Olivier,

Thank you so much for the helpful explanation. That really clear up my question!

Best regards,
Firdaus Soberi