Exception raised while reweighting

Hi,

This is a limitation of the re-weighting method in presence of decay-chain.
The error is more clear in debug mode actually.

The problem is that the re-weighting module is not able to distinguish between

> C Process: g u > d~ tp b WEIGHTED<=5 / tp tp g u c d s u c d s t t
> C y y bp bp x x z h a @1
> C * Decay: tp > w+ b WEIGHTED<=2
> C * Decay: w+ > c s~ WEIGHTED<=2

and

> C Process: g u > s~ tp b WEIGHTED<=5 / tp tp g u c d s u c d s t t
> C y y bp bp x x z h a @1
> C * Decay: tp > w+ b WEIGHTED<=2
> C * Decay: w+ > c d~ WEIGHTED<=2

You have identical initial/final state for those two matrix-element but the matrix-element is different due to feature (in this case onshell particle) that are not handle within the re-weighting package.

We are looking for man power to extend the functionality in that direction actually

Cheers

Olivier

> On 9 May 2019, at 00:16, Avik Roy <email address hidden> wrote:
>
> New question #680707 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/680707
>
> This is (again) in context of single production of vlqs, using MG 2.6.5. The simulated process is as follows:
>
> import model VLQ_UFO
>
> define p = g u c d s u~ c~ d~ s~
> define j = g u c d s u~ c~ d~ s~
> define bb = b b~
> define ww = w+ w-
> define tt = t t~
> define ferm = ve vm vt ve~ vm~ vt~ mu- ta- e- mu+ ta+ e+ u c d s u~ c~ d~ s~
> define VLQ = tp tp~
> add process p p > j VLQ bb / tp tp~ p t t~ y y~ bp bp~ x x~ z h a, (VLQ > ww bb, ww > ferm ferm)
> output -f
>
> Reweighting is interrpted with the following error message:
> Command "reweight run_02" interrupted with error:
> Exception :
> Please report this bug on https://bugs.launchpad.net/mg5amcnlo
> More information is found in '/afs/cern.ch/work/a/avroy/MG_Reweight_Standalone/MG5_aMC_v2_6_5/VLQ_W_DECAY/run_02_tag_1_debug.log'.
> Please attach this file to your report.
>
> The log file contains the following text:
> reweight run_02
> Traceback (most recent call last):
> File "/afs/cern.ch/work/a/avroy/MG_Reweight_Standalone/MG5_aMC_v2_6_5/VLQ_W_DECAY/bin/internal/extended_cmd.py", line 1514, in onecmd
> return self.onecmd_orig(line, **opt)
> File "/afs/cern.ch/work/a/avroy/MG_Reweight_Standalone/MG5_aMC_v2_6_5/VLQ_W_DECAY/bin/internal/extended_cmd.py", line 1463, in onecmd_orig
> return func(arg, **opt)
> File "/afs/cern.ch/work/a/avroy/MG_Reweight_Standalone/MG5_aMC_v2_6_5/VLQ_W_DECAY/bin/internal/common_run_interface.py", line 2142, in do_reweight
> reweight_cmd.import_command_file(path)
> File "/afs/cern.ch/work/a/avroy/MG_Reweight_Standalone/MG5_aMC_v2_6_5/madgraph/interface/extended_cmd.py", line 1660, in import_command_file
> self.exec_cmd(line, precmd=True)
> File "/afs/cern.ch/work/a/avroy/MG_Reweight_Standalone/MG5_aMC_v2_6_5/madgraph/interface/extended_cmd.py", line 1543, in exec_cmd
> stop = Cmd.onecmd_orig(current_interface, line, **opt)
> File "/afs/cern.ch/work/a/avroy/MG_Reweight_Standalone/MG5_aMC_v2_6_5/madgraph/interface/extended_cmd.py", line 1463, in onecmd_orig
> return func(arg, **opt)
> File "/afs/cern.ch/work/a/avroy/MG_Reweight_Standalone/MG5_aMC_v2_6_5/madgraph/various/misc.py", line 100, in f_with_no_logger
> out = f(self, *args, **opt)
> File "/afs/cern.ch/work/a/avroy/MG_Reweight_Standalone/MG5_aMC_v2_6_5/madgraph/interface/reweight_interface.py", line 489, in do_launch
> self.load_module()
> File "/afs/cern.ch/work/a/avroy/MG_Reweight_Standalone/MG5_aMC_v2_6_5/madgraph/interface/reweight_interface.py", line 1803, in load_module
> raise Exception
> Exception
> Run Options
> -----------
> stdout_level : None
>
> MadEvent Options
> ----------------
> automatic_html_opening : False (user set)
> notification_center : True
> cluster_temp_path : None
> cluster_memory : None
> cluster_size : 100
> cluster_queue : None
> nb_core : 10 (user set)
> cluster_time : None
> run_mode : 2
>
> Configuration Options
> ---------------------
> text_editor : None
> cluster_local_path : None
> cluster_status_update : (600, 30)
> pythia8_path : None (user set)
> hwpp_path : None (user set)
> pythia-pgs_path : None (user set)
> td_path : None (user set)
> delphes_path : None (user set)
> thepeg_path : None (user set)
> cluster_type : condor
> madanalysis5_path : None (user set)
> cluster_nb_retry : 1
> eps_viewer : None
> web_browser : None
> syscalc_path : None (user set)
> madanalysis_path : None (user set)
> lhapdf : lhapdf-config
> f2py_compiler : None
> hepmc_path : None (user set)
> cluster_retry_wait : 300
> fortran_compiler : None
> auto_update : 7 (user set)
> exrootanalysis_path : None (user set)
> timeout : 60
> cpp_compiler : None
> #************************************************************
> #* MadGraph5_aMC@NLO *
> #* *
> #* * * *
> #* * * * * *
> #* * * * * 5 * * * * *
> #* * * * * *
> #* * * *
> #* *
> #* *
> #* VERSION 2.6.5 2018-02-03 *
> #* *
> #* The MadGraph5_aMC@NLO Development Team - Find us at *
> #* https://server06.fynu.ucl.ac.be/projects/madgraph *
> #* *
> #************************************************************
> #* *
> #* Command File for MadGraph5_aMC@NLO *
> #* *
> #* run as ./bin/mg5_aMC filename *
> #* *
> #************************************************************
> set default_unset_couplings 99
> set group_subprocesses Auto
> set ignore_six_quark_processes False
> set loop_optimized_output True
> set loop_color_flows False
> set gauge unitary
> set complex_mass_scheme False
> set max_npoint_for_channel 0
> import model VLQ_UFO
> define l+ = e+ mu+
> define l- = e- mu-
> define vl = ve vm vt
> define vl~ = ve~ vm~ vt~
> define p = g u c d s u~ c~ d~ s~
> define j = g u c d s u~ c~ d~ s~
> define bb = b b~
> define WW = w+ w-
> define tt = t t~
> define ferm = ve vm vt u c d s b e- mu- ta- ve~ vm~ vt~ u~ c~ d~ s~ b~\
> e+ mu+ ta+
> define VLQ = tp tp~
> generate p p > j bb VLQ /tp tp~ p t t~ y y~ bp bp~ x x~ z h a, (VLQ >\
> ww bb, ww > ferm ferm)
> output VLQ_W_DECAY
> ######################################################################
> ## PARAM_CARD AUTOMATICALY GENERATED BY MG5 ####
> ######################################################################
> ###################################
> ## INFORMATION FOR CKMBLOCK
> ###################################
> BLOCK CKMBLOCK #
> 1 1 9.742800e-01 # ckm11
> 1 2 2.253000e-01 # ckm12
> 1 3 3.470000e-03 # ckm13
> 2 1 2.252000e-01 # ckm21
> 2 2 9.734500e-01 # ckm22
> 2 3 4.100000e-02 # ckm23
> 3 1 8.620000e-03 # ckm31
> 3 2 4.030000e-02 # ckm32
> 3 3 9.991520e-01 # ckm33
> ###################################
> ## INFORMATION FOR KAPPA
> ###################################
> BLOCK KAPPA #
> 1 0.000000e+00 # kx
> 2 5.000000e-01 # kt
> 3 0.000000e+00 # kb
> 4 0.000000e+00 # ky
> ###################################
> ## INFORMATION FOR MASS
> ###################################
> BLOCK MASS #
> 5 4.200000e+00 # mb
> 6 1.743000e+02 # mt
> 15 1.777000e+00 # mta
> 23 9.118760e+01 # mz
> 25 1.250000e+02 # mh
> 6000005 6.000000e+02 # mx
> 6000006 1.500000e+03 # mtp
> 6000007 6.000000e+02 # mbp
> 6000008 6.000000e+02 # my
> 1 0.000000e+00 # d : 0.0
> 2 0.000000e+00 # u : 0.0
> 3 0.000000e+00 # s : 0.0
> 4 0.000000e+00 # c : 0.0
> 11 0.000000e+00 # e- : 0.0
> 12 0.000000e+00 # ve : 0.0
> 13 0.000000e+00 # mu- : 0.0
> 14 0.000000e+00 # vm : 0.0
> 16 0.000000e+00 # vt : 0.0
> 21 0.000000e+00 # g : 0.0
> 22 0.000000e+00 # a : 0.0
> 24 7.981880e+01 # 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 1.166000e-05 # gf
> 3 1.180000e-01 # as
> ###################################
> ## INFORMATION FOR XI
> ###################################
> BLOCK XI #
> 1 4.000000e-01 # xitpw
> 2 3.000000e-01 # xitpz
> 3 3.000000e-01 # xitph
> 4 4.000000e-01 # xibpw
> 5 3.000000e-01 # xibpz
> 6 3.000000e-01 # xibph
> ###################################
> ## INFORMATION FOR YUKAWA
> ###################################
> BLOCK YUKAWA #
> 5 4.200000e+00 # ymb
> 6 1.743000e+02 # ymt
> 15 1.777000e+00 # ymtau
> ###################################
> ## INFORMATION FOR ZETA
> ###################################
> BLOCK ZETA #
> 1 3.000000e-01 # zetaxul
> 2 3.000000e-01 # zetaxcl
> 3 4.000000e-01 # zetaxtl
> 4 0.000000e+00 # zetatul
> 5 0.000000e+00 # zetatcl
> 6 1.000000e+00 # zetattl
> 7 3.000000e-01 # zetabdl
> 8 3.000000e-01 # zetabsl
> 9 4.000000e-01 # zetabbl
> 10 3.000000e-01 # zetaydl
> 11 3.000000e-01 # zetaysl
> 12 4.000000e-01 # zetaybl
> 13 0.000000e+00 # zetaxur
> 14 0.000000e+00 # zetaxcr
> 15 0.000000e+00 # zetaxtr
> 16 0.000000e+00 # zetatur
> 17 0.000000e+00 # zetatcr
> 18 0.000000e+00 # zetattr
> 19 0.000000e+00 # zetabdr
> 20 0.000000e+00 # zetabsr
> 21 0.000000e+00 # zetabbr
> 22 0.000000e+00 # zetaydr
> 23 0.000000e+00 # zetaysr
> 24 0.000000e+00 # zetaybr
> ###################################
> ## INFORMATION FOR DECAY
> ###################################
> BLOCK QNUMBERS 6000005 # x
> 1 5 # 3 times electric charge
> 2 2 # number of spin states (2s+1)
> 3 3 # colour rep (1: singlet, 3: triplet, 8: octet)
> 4 1 # particle/antiparticle distinction (0=own anti)
> ###################################
> ## INFORMATION FOR QNUMBERS 6000006
> ###################################
> BLOCK QNUMBERS 6000006 # tp
> 1 2 # 3 times electric charge
> 2 2 # number of spin states (2s+1)
> 3 3 # colour rep (1: singlet, 3: triplet, 8: octet)
> 4 1 # particle/antiparticle distinction (0=own anti)
> ###################################
> ## INFORMATION FOR QNUMBERS 6000007
> ###################################
> BLOCK QNUMBERS 6000007 # bp
> 1 -1 # 3 times electric charge
> 2 2 # number of spin states (2s+1)
> 3 3 # colour rep (1: singlet, 3: triplet, 8: octet)
> 4 1 # particle/antiparticle distinction (0=own anti)
> ###################################
> ## INFORMATION FOR QNUMBERS 6000008
> ###################################
> BLOCK QNUMBERS 6000008 # y
> 1 -4 # 3 times electric charge
> 2 2 # number of spin states (2s+1)
> 3 3 # colour rep (1: singlet, 3: triplet, 8: octet)
> 4 1 # particle/antiparticle distinction (0=own anti)
> #
> #*************************
> # Decay widths *
> #*************************
> #
> # PDG Width
> DECAY 1 0.000000e+00
> #
> # PDG Width
> DECAY 2 0.000000e+00
> #
> # PDG Width
> DECAY 3 0.000000e+00
> #
> # PDG Width
> DECAY 4 0.000000e+00
> #
> # PDG Width
> DECAY 5 0.000000e+00
> #
> # PDG Width
> DECAY 6 1.510135e+00
> #
> # PDG Width
> DECAY 11 0.000000e+00
> #
> # PDG Width
> DECAY 12 0.000000e+00
> #
> # PDG Width
> DECAY 13 0.000000e+00
> #
> # PDG Width
> DECAY 14 0.000000e+00
> #
> # PDG Width
> DECAY 15 0.000000e+00
> #
> # PDG Width
> DECAY 16 0.000000e+00
> #
> # PDG Width
> DECAY 21 0.000000e+00
> #
> # PDG Width
> DECAY 22 0.000000e+00
> #
> # PDG Width
> DECAY 23 2.446400e+00
> #
> # PDG Width
> DECAY 24 2.035356e+00
> #
> # PDG Width
> DECAY 25 6.794858e-03
> #
> # PDG Width
> DECAY 6000005 1.000000e+00
> #
> # PDG Width
> DECAY 6000006 2.734470e+02
> # BR NDA ID1 ID2 ...
> 4.049048e-01 2 5 24 # 110.720002846
> 3.035579e-01 2 6 25 # 83.0069970813
> 2.915373e-01 2 6 23 # 79.7200000731
> #
> # PDG Width
> DECAY 6000007 1.000000e+00
> #
> # PDG Width
> DECAY 6000008 1.000000e+00
> #*********************************************************************
> # 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 *
> # *
> # To display more options, you can type the command: *
> # update full_run_card *
> #*********************************************************************
> #
> #*******************
> # Running parameters
> #*******************
> #
> #*********************************************************************
> # Tag name for the run (one word) *
> #*********************************************************************
> _00 = 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. *
> #*********************************************************************
> 5000 = 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
> 6500.0 = ebeam1 ! beam 1 total energy in GeV
> 6500.0 = ebeam2 ! beam 2 total energy in GeV
> # To see polarised beam options: type "update beam_pol"
> #*********************************************************************
> # PDF CHOICE: this automatically fixes also alpha_s and its evol. *
> #*********************************************************************
> nn23lo1 = pdlabel ! PDF set
> 230000 = lhaid ! if pdlabel=lhapdf, this is the lhapdf number
> # To see heavy ion options: type "update ion_pdf"
> #*********************************************************************
> # Renormalization and factorization scales *
> #*********************************************************************
> False = fixed_ren_scale ! if .true. use fixed ren scale
> False = 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
> -1 = dynamical_scale_choice ! Choose one of the preselected dynamical choices
> 1.0 = scalefact ! scale factor for event-by-event scales
> #*********************************************************************
> # Type and output format
> #*********************************************************************
> False = 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
> average = 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
> 4 = 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)
> #*********************************************************************
> False = cut_decays ! Cut decay products
> #*********************************************************************
> # Standard Cuts *
> #*********************************************************************
> # Minimum and maximum pt's (for max, -1 means no cut) *
> #*********************************************************************
> 20.0 = ptj ! minimum pt for the jets
> 0.0 = ptb ! minimum pt for the b
> 10.0 = pta ! minimum pt for the photons
> 10.0 = ptl ! minimum pt for the charged leptons
> 0.0 = misset ! minimum missing Et (sum of neutrino's momenta)
> -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)
> {} = pt_min_pdg ! pt cut for other particles (use pdg code). Applied on particle and anti-particle
> {} = pt_max_pdg ! pt cut for other particles (syntax e.g. {6: 100, 25: 50})
> #*********************************************************************
> # 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
> {} = e_min_pdg ! E cut for other particles (use pdg code). Applied on particle and anti-particle
> {} = e_max_pdg ! E cut for other particles (syntax e.g. {6: 100, 25: 50})
> #*********************************************************************
> # Maximum and minimum absolute rapidity (for max, -1 means no cut) *
> #*********************************************************************
> 5.0 = etaj ! max rap for the jets
> -1.0 = etab ! max rap for the b
> 2.5 = etaa ! max rap for the photons
> 2.5 = 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
> {} = eta_min_pdg ! rap cut for other particles (use pdg code). Applied on particle and anti-particle
> {} = eta_max_pdg ! rap cut for other particles (syntax e.g. {6: 2.5, 23: 5})
> #*********************************************************************
> # Minimum and maximum DeltaR distance *
> #*********************************************************************
> 0.4 = drjj ! min distance between jets
> 0.0 = drbb ! min distance between b's
> 0.4 = drll ! min distance between leptons
> 0.4 = draa ! min distance between gammas
> 0.0 = drbj ! min distance between b and jet
> 0.4 = draj ! min distance between gamma and jet
> 0.4 = 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
> 0.4 = 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
> {} = mxx_min_pdg ! min invariant mass of a pair of particles X/X~ (e.g. {6:250})
> {'default': False} = mxx_only_part_antipart ! if True the invariant mass is applied only
> ! to pairs of particle/antiparticle and not to pairs of the same pdg codes.
> #*********************************************************************
> # 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 = ptheavy ! minimum pt for at least one heavy final state
> 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, 6000005, 6000006, 6000007, 6000008 = 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
> #
> #systematics = systematics_program ! none, systematics [python], SysCalc [depreceted, C++]
> #['--mur=0.5,1,2', '--muf=0.5,1,2', '--pdf=errorset'] = systematics_arguments ! see: https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/Systematics#Systematicspythonmodule
> # Syscalc is deprecated but to see the associate options type'update syscalc'
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Actually, you can try the following patch: https://bazaar.launchpad.net/~mg5core1/mg5amcnlo/2.6.6/diff/318?context=3, which includes one (not yet validated) flag in the reweight card to force the reweighting to distinguish those two matrix-element.

the line to add in the reweight_card is "change keep_ordering True"

Has the name indicated, the ambuiguity is removed by the ordering of the particle inside the lhe file.
This is obviously dangerous.
Indeed this assumes that the ordering of the particle within the lhe file is the same as the one of the related matrix-element.
In general this is true but it might not be always the case.

Cheers,

Olivier

PS: This flag is (and likely will stay) experimental so please be careful and validate it in your case.