failed to generate enough evnet

######################################################################
## PARAM_CARD AUTOMATICALY GENERATED BY MG5 ####
######################################################################
###################################
## INFORMATION FOR CKMBLOCK
###################################
BLOCK CKMBLOCK #
      1 2.277360e-01 # cabi
###################################
## INFORMATION FOR MASS
###################################
BLOCK MASS #
      1 5.040000e-03 # md
      2 2.550000e-03 # mu
      3 1.010000e-01 # ms
      4 1.270000e+00 # mc
      5 4.700000e+00 # mb
      6 1.733000e+02 # mt
      11 5.110000e-04 # me
      13 1.056600e-01 # mmu
      15 1.777000e+00 # mta
      23 9.118760e+01 # mz
      25 1.257000e+02 # mh
      9900012 1.100000e+04 # mn1
      9900014 2.000000e+04 # mn2
      9900016 2.100000e+04 # mn3
      12 0.000000e+00 # ve : 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 7.995123e+01 # w+ : cmath.sqrt(mz__exp__2/2. + cmath.sqrt(mz__exp__4/4. - (aew*cmath.pi*mz__exp__2)/(gf*sqrt__2)))
      9000002 9.118760e+01 # ghz : mz
      9000003 7.995123e+01 # ghwp : mw
      9000004 7.995123e+01 # ghwm : mw
###################################
## INFORMATION FOR NUMIXING
###################################
BLOCK NUMIXING #
      1 1.000000e-01 # ven1
      5 1.000000e-01 # vmun2
      9 1.000000e-01 # vtan3
###################################
## INFORMATION FOR SMINPUTS
###################################
BLOCK SMINPUTS #
      1 1.279400e+02 # aewm1
      2 1.174560e-05 # gf
      3 1.300000e-01 # as (note that parameter not used if you use a pdf set)
###################################
## INFORMATION FOR YUKAWA
###################################
BLOCK YUKAWA #
      1 5.040000e-03 # ymdo
      2 2.550000e-03 # ymup
      3 1.010000e-01 # yms
      4 1.270000e+00 # ymc
      5 4.700000e+00 # ymb
      6 1.733000e+02 # ymt
      11 5.110000e-04 # yme
      13 1.056600e-01 # ymm
      15 1.777000e+00 # ymtau
###################################
## INFORMATION FOR QNUMBERS 9000001
###################################
BLOCK QNUMBERS 9000001 # gha
      1 0 # 3 times electric charge
      2 1 # number of spin states (2s+1)
      3 1 # colour rep (1: singlet, 3: triplet, 8: octet)
      4 1 # particle/antiparticle distinction (0=own anti)
###################################
## INFORMATION FOR QNUMBERS 9000002
###################################
BLOCK QNUMBERS 9000002 # ghz
      1 0 # 3 times electric charge
      2 1 # number of spin states (2s+1)
      3 1 # colour rep (1: singlet, 3: triplet, 8: octet)
      4 1 # particle/antiparticle distinction (0=own anti)
###################################
## INFORMATION FOR QNUMBERS 9000003
###################################
BLOCK QNUMBERS 9000003 # ghwp
      1 3 # 3 times electric charge
      2 1 # number of spin states (2s+1)
      3 1 # colour rep (1: singlet, 3: triplet, 8: octet)
      4 1 # particle/antiparticle distinction (0=own anti)
###################################
## INFORMATION FOR QNUMBERS 9000004
###################################
BLOCK QNUMBERS 9000004 # ghwm
      1 -3 # 3 times electric charge
      2 1 # number of spin states (2s+1)
      3 1 # colour rep (1: singlet, 3: triplet, 8: octet)
      4 1 # particle/antiparticle distinction (0=own anti)
###################################
## INFORMATION FOR QNUMBERS 82
###################################
BLOCK QNUMBERS 82 # ghg
      1 0 # 3 times electric charge
      2 1 # number of spin states (2s+1)
      3 8 # colour rep (1: singlet, 3: triplet, 8: octet)
      4 1 # particle/antiparticle distinction (0=own anti)
###################################
## INFORMATION FOR QNUMBERS 9900012
###################################
BLOCK QNUMBERS 9900012 # n1
      1 0 # 3 times electric charge
      2 2 # number of spin states (2s+1)
      3 1 # colour rep (1: singlet, 3: triplet, 8: octet)
      4 0 # particle/antiparticle distinction (0=own anti)
###################################
## INFORMATION FOR QNUMBERS 9900014
###################################
BLOCK QNUMBERS 9900014 # n2
      1 0 # 3 times electric charge
      2 2 # number of spin states (2s+1)
      3 1 # colour rep (1: singlet, 3: triplet, 8: octet)
      4 0 # particle/antiparticle distinction (0=own anti)
###################################
## INFORMATION FOR QNUMBERS 9900016
###################################
BLOCK QNUMBERS 9900016 # n3
      1 0 # 3 times electric charge
      2 2 # number of spin states (2s+1)
      3 1 # colour rep (1: singlet, 3: triplet, 8: octet)
      4 0 # 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 1.350000e+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 2.495200e+00
#
# PDG Width
DECAY 24 2.085000e+00
#
# PDG Width
DECAY 25 4.170000e-03
#
# PDG Width
DECAY 9000002 2.495200e+00
#
# PDG Width
DECAY 9000003 2.085000e+00
#
# PDG Width
DECAY 9000004 2.085000e+00
#
# PDG Width
DECAY 9900012 1.759260e+04
# BR NDA ID1 ID2 ...
   2.500163e-01 2 24 11 # 4398.437255358845
   2.500163e-01 2 -24 -11 # 4398.437255358845
   1.250082e-01 2 23 12 # 2199.2186149355402
   1.250082e-01 2 23 -12 # 2199.2186149355402
   1.249755e-01 2 25 12 # 2198.6443243818867
   1.249755e-01 2 25 -12 # 2198.6443243818867
#
# PDG Width
DECAY 9900014 1.057455e+05
# BR NDA ID1 ID2 ...
   2.500049e-01 2 24 13 # 26436.88828516984
   2.500049e-01 2 -24 -13 # 26436.88828516984
   1.250025e-01 2 23 14 # 13218.444136682263
   1.250025e-01 2 23 -14 # 13218.444136682263
   1.249926e-01 2 25 14 # 13217.399884970644
   1.249926e-01 2 25 -14 # 13217.399884970644
#
# PDG Width
DECAY 9900016 1.224138e+05
# BR NDA ID1 ID2 ...
   2.500045e-01 2 24 15 # 30604.00215043002
   2.500045e-01 2 -24 -15 # 30604.00215043002
   1.250022e-01 2 23 16 # 15302.00139724392
   1.250022e-01 2 23 -16 # 15302.00139724392
   1.249933e-01 2 25 16 # 15300.904929260483
   1.249933e-01 2 25 -16 # 15300.904929260483

#*********************************************************************
# 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 to_full *
#*********************************************************************
#
#*********************************************************************
# Tag name for the run (one word) *
#*********************************************************************
  0.175 = run_tag ! name of the run
#*********************************************************************
# Number of events and rnd seed *
# Warning: Do not generate more than 1M events in a single run *
#*********************************************************************
  100000 = 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=elastic photon of proton/ion beam *
# +/-3=PDF of electron/positron beam *
# +/-4=PDF of muon/antimuon beam *
#*********************************************************************
  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 alpha_s and its evol. *
# pdlabel: lhapdf=LHAPDF (installation needed) [1412.7420] *
# iww=Improved Weizsaecker-Williams Approx.[hep-ph/9310350] *
# eva=Effective W/Z/A Approx. [2111.02442] *
# edff=EDFF in gamma-UPC [eq.(11) in 2207.03012] *
# chff=ChFF in gamma-UPC [eq.(13) in 2207.03012] *
# none=No PDF, same as lhapdf with lppx=0 *
#*********************************************************************
  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)
  average = event_norm ! average/sum. Normalization of the weight in the LHEF
# To see MLM/CKKW merging options: type "update MLM" or "update CKKW"

#*********************************************************************
#
#*********************************************************************
# Phase-Space Optimization strategy (basic options)
#*********************************************************************
  0 = nhel ! using helicities importance sampling or not.
                             ! 0: sum over helicity, 1: importance sampling
  2 = sde_strategy ! default integration strategy (hep-ph/2021.00773)
                             ! 1 is old strategy (using amp square)
        ! 2 is new strategy (using only the denominator)
#*********************************************************************
# Phase-Space Optim (advanced)
#*********************************************************************
   0 = job_strategy ! see appendix of 1507.00020 (page 26)
   2 = hard_survey ! force to have better estimate of the integral at survey for difficult mode like interference
   -1.0 = tmin_for_channel ! limit the non-singular reach of --some-- channel of integration related to T-channel diagram (value between -1 and 0), -1 is no impact
   -1 = survey_splitting ! for loop-induced control how many core are used at survey for the computation of a single iteration.
   2 = survey_nchannel_per_job ! control how many Channel are integrated inside a single job on cluster/multicore
   -1 = refine_evt_by_job ! control the maximal number of events for the first iteration of the refine (larger means less jobs)
#*********************************************************************
# Compilation flag. No automatic re-compilation (need manual "make clean" in Source)
#*********************************************************************
   -O = global_flag ! fortran optimization flag use for the all code.
     = aloha_flag ! fortran optimization flag for aloha function. Suggestions: '-ffast-math'
    = matrix_flag ! fortran optimization flag for matrix.f function. Suggestions: '-O3'

#*********************************************************************
# Customization (custom cuts/scale/bias/...) *
# list of files containing fortran function that overwrite default *
#*********************************************************************
   = custom_fcts ! List of files containing user hook function
#*******************************
# Parton level cuts definition *
#*******************************
  0.0 = dsqrt_shat ! minimal shat for full process
#
#
#*********************************************************************
# BW cutoff (M+/-bwcutoff*Gamma) ! Define on/off-shell for "$" and decay
#*********************************************************************
  15.0 = bwcutoff ! (M+/-bwcutoff*Gamma)
#*********************************************************************
# Standard Cuts *
#*********************************************************************
# Minimum and maximum pt's (for max, -1 means no cut) *
#*********************************************************************
  20.0 = ptj ! minimum pt for the jets
  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 = 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})
#
# For display option for energy cut in the partonic center of mass frame type 'update ecut'
#
#*********************************************************************
# Maximum and minimum absolute rapidity (for max, -1 means no cut) *
#*********************************************************************
  5.0 = etaj ! max rap for the jets
  2.5 = etal ! max rap for the charged leptons
  0.0 = etalmin ! min 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 *
#*********************************************************************
  0.1 = drjj ! min distance between jets
  0.1 = drjl ! min distance between jet and lepton
  -1.0 = drjjmax ! max distance between jets
  -1.0 = drjlmax ! max distance between jet and lepton
#*********************************************************************
# Minimum and maximum invariant mass for pairs *
#*********************************************************************
  0.0 = mmjj ! min invariant mass of a jet pair
  -1.0 = mmjjmax ! max invariant mass of a jet 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 / neutrino *
 # for pair of lepton includes only same flavor, opposite charge
 #*********************************************************************
#*********************************************************************
# Inclusive cuts *
#*********************************************************************
  0.0 = xptj ! minimum pt for at least one jet
 #*********************************************************************
 # 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
  -1.0 = ptj1max ! maximum pt for the leading jet in pt
  -1.0 = ptj2max ! maximum pt for the second jet in pt
  0 = cutuse ! reject event if fails any (0) / all (1) jet pt cuts
 #*********************************************************************
 # 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)
 #*********************************************************************
 # 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
#*********************************************************************
# maximal pdg code for quark to be considered as a light jet *
# (otherwise b cuts are applied) *
#*********************************************************************
  5 = maxjetflavor ! Maximum jet pdg code
#*********************************************************************
#
#*********************************************************************
# Store info for systematics studies *
# WARNING: Do not use for interference type of computation *
#*********************************************************************
  True = 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

How is your process defined?

p p > mu v j j, QCD==0 NP==2
mu = mu- mu+, v = vl vl~, j = u d c s b u~ d~ s~ c~ b~ g

So it is s-channel (pp>muN, N>vz, z>jj)? and you are giving 20TeV mN for 13TeV collision? This is not "impossible" if N is offshell and gets produced with lower energy. But probably this is way too out of the boundary and thus makes the calculation very unstable.

No, it's a t-channel, like the vector boson fusion (VBF) process, and the heavy neutrino can be off-shell.

i see the diagram you mean, but it's still a mixture of the two
a. the one i described above pp>muN, N>vz, z>jj
b. one quark radiating W and giving N and mu, the other quark radiation Z and getting N and emitting v

@olivier would giving large mjj cut and forcing one specific diagram help in such cases?

One can try.

Cheers,

Olivier

I have tried it, and sometimes it works, but it will fail for other masses. Do you have other suggestions?

deltaeta, drjj cuts as vbf process is expected to be large in most cases, if this doesn't work it just means that phase space integration is not stable enough

I adjusted the sde_strategy and the hard_survey and combined the large m_jj cut. It worked. Thanks for your response.