Computation problem NLO QCD e+e- collider

Asked by Oscar Ochoa Valeriano on 2021-06-03

Dear MadGraph experts,

I come to you with a problem similar to the one described here: https://answers.launchpad.net/mg5amcnlo/+question/446723 , but I cannot solve mine.

I'm trying to compute fixed-order corrections to the LO XS of the process e+ e- > l l j j / h [QCD] (j: 5-flavour scheme; l: all charged leptons) using MadGraph's default loop_sm model. I have modified the cuts.f file found under the folder SubProcesses to implement custom cuts, apart from the ones available in the run card, such as: 70 GeV < m_ll < 110 GeV, pT(j_i) > 5 GeV, m_jj > 10 GeV.

My process runs smoothly at \sqrt{s} = 250 and 1000 GeV. However, at \sqrt{s} = 3 TeV I'm getting the following error:

Command "calculate_xsect NLO -f" interrupted with error:
Exception : program /mt/home/ovaleriano/Documents/Software/MadGraph/XS_lljj_Zh_3000_QCD/SubProcesses/P0_epem_mummupbbx_no_h/ajob1 2 all 0 0 launch ends with non zero status: 1. Stop all computation

As suggested in the post mentioned above, I tried to modify the setcuts.f card, where I added the following line (L420):

            tau_Born_lower_bound=taumin(iFKS,ichan)**2/stot
c User-defined. Based on https://answers.launchpad.net/mg5amcnlo/+question/446723
            taumin_j(iFKS,ichan) = 150d0

            tau_lower_bound=taumin_j(iFKS,ichan)**2/stot

I have tried setting the taumin_j(iFKS,ichan) variable to different values, ranging from 150 to 1500, but the process doesn't seem to compile, so perhaps this is something different. Any chance for help? Please find below the .log file of the run.

Best,

Oscar.

#************************************************************
#* MadGraph5_aMC@NLO *
#* *
#* * * *
#* * * * * *
#* * * * * 5 * * * * *
#* * * * * *
#* * * *
#* *
#* *
#* VERSION 5.2.7.3 20xx-xx-xx *
#* *
#* The MadGraph5_aMC@NLO Development Team - Find us at *
#* https://server06.fynu.ucl.ac.be/projects/madgraph *
#* and *
#* http://amcatnlo.cern.ch *
#* *
#************************************************************
#* *
#* Command File for aMCatNLO *
#* *
#* run as ./bin/aMCatNLO.py filename *
#* *
#************************************************************
calculate_xsect NLO -f
Traceback (most recent call last):
  File "/mt/home/ovaleriano/Documents/Software/MadGraph/XS_lljj_Zh_3000_QCD/bin/internal/extended_cmd.py", line 1515, in onecmd
    return self.onecmd_orig(line, **opt)
  File "/mt/home/ovaleriano/Documents/Software/MadGraph/XS_lljj_Zh_3000_QCD/bin/internal/extended_cmd.py", line 1464, in onecmd_orig
    return func(arg, **opt)
  File "/mt/home/ovaleriano/Documents/Software/MadGraph/XS_lljj_Zh_3000_QCD/bin/internal/amcatnlo_run_interface.py", line 1566, in do_calculate_xsect
    self.do_launch(line, options, argss)
  File "/mt/home/ovaleriano/Documents/Software/MadGraph/XS_lljj_Zh_3000_QCD/bin/internal/amcatnlo_run_interface.py", line 1694, in do_launch
    evt_file = self.run(mode, options)
  File "/mt/home/ovaleriano/Documents/Software/MadGraph/XS_lljj_Zh_3000_QCD/bin/internal/amcatnlo_run_interface.py", line 1858, in run
    self.run_all_jobs(jobs_to_run,integration_step)
  File "/mt/home/ovaleriano/Documents/Software/MadGraph/XS_lljj_Zh_3000_QCD/bin/internal/amcatnlo_run_interface.py", line 2131, in run_all_jobs
    self.wait_for_complete(run_type)
  File "/mt/home/ovaleriano/Documents/Software/MadGraph/XS_lljj_Zh_3000_QCD/bin/internal/amcatnlo_run_interface.py", line 4700, in wait_for_complete
    self.cluster.wait(self.me_dir, update_status)
  File "/mt/home/ovaleriano/Documents/Software/MadGraph/XS_lljj_Zh_3000_QCD/bin/internal/cluster.py", line 822, in wait
    raise Exception, self.fail_msg
Exception: program /mt/home/ovaleriano/Documents/Software/MadGraph/XS_lljj_Zh_3000_QCD/SubProcesses/P0_epem_mummupbbx_no_h/ajob1 2 all 0 0 launch ends with non zero status: 1. Stop all computation
Value of current Options:
              text_editor : None
      notification_center : True
                    pjfry : None
       cluster_local_path : None
    cluster_status_update : (600, 30)
               hepmc_path : /mt/home/ovaleriano/Documents/Software/MadGraph/MG5_aMC_v2_6_3_2/HEPTools/hepmc
          pythia-pgs_path : None
              thepeg_path : None
        madanalysis5_path : /mt/home/ovaleriano/Documents/Software/MadGraph/MG5_aMC_v2_6_3_2/HEPTools/madanalysis5/madanalysis5
                      OLP : MadLoop
                 applgrid : applgrid-config
                 run_mode : 2
        cluster_temp_path : None
            cluster_queue : None
         madanalysis_path : None
                   lhapdf : /mt/home/ovaleriano/Documents/Software/MadGraph/MG5_aMC_v2_6_3_2/HEPTools/lhapdf6/bin/lhapdf-config
      output_dependencies : external
            f2py_compiler : None
                    ninja : /mt/home/ovaleriano/Documents/Software/MadGraph/MG5_aMC_v2_6_3_2/HEPTools/lib
   automatic_html_opening : False
       cluster_retry_wait : 300
      exrootanalysis_path : /mt/home/ovaleriano/Documents/Software/MadGraph/MG5_aMC_v2_6_3_2/ExRootAnalysis
                  timeout : 60
                  nb_core : 72
         fortran_compiler : None
                  collier : /mt/home/ovaleriano/Documents/Software/MadGraph/MG5_aMC_v2_6_3_2/HEPTools/lib
             pythia8_path : /mt/home/ovaleriano/Documents/Software/MadGraph/MG5_aMC_v2_6_3_2/HEPTools/pythia8
                hwpp_path : None
                    golem : None
                  td_path : None
             delphes_path : /mt/home/ovaleriano/Documents/Software/MadGraph/MG5_aMC_v2_6_3_2/Delphes-3.4.2
              auto_update : 7
             cluster_type : condor
               eps_viewer : None
                  fastjet : /mt/home/ovaleriano/Documents/Software/Herwig/bin/fastjet-config
              web_browser : None
             cluster_size : 100
           cluster_memory : None
                  amcfast : amcfast-config
             stdout_level : None
             cluster_time : None
mg5amc_py8_interface_path : /mt/home/ovaleriano/Documents/Software/MadGraph/MG5_aMC_v2_6_3_2/HEPTools/MG5aMC_PY8_interface
         cluster_nb_retry : 1
                 mg5_path : /mt/home/ovaleriano/Documents/Software/MadGraph/MG5_aMC_v2_6_3_2
             syscalc_path : None
             cpp_compiler : None
#************************************************************
#* MadGraph5_aMC@NLO *
#* *
#* * * *
#* * * * * *
#* * * * * 5 * * * * *
#* * * * * *
#* * * *
#* *
#* *
#* VERSION 2.7.3 2020-06-21 *
#* *
#* 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 low_mem_multicore_nlo_generation False
set loop_color_flows False
set gauge unitary
set complex_mass_scheme False
set max_npoint_for_channel 0
import model sm
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 = l+ l- ta+ ta-
define myj = j b b~
import model loop_sm
generate e+ e- > l l myj myj / h [QCD]
output XS_lljj_Zh_3000_QCD
######################################################################
## 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 LOOP
###################################
Block loop
    1 9.118800e+01 # MU_R

###################################
## INFORMATION FOR MASS
###################################
Block mass
    5 4.700000e+00 # MB
    6 1.730000e+02 # MT
   15 1.777000e+00 # MTA
   23 9.118800e+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 0.000000e+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 8.041900e+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 1.325070e+02 # aEWM1
    2 1.166390e-05 # Gf
    3 1.180000e-01 # aS

###################################
## INFORMATION FOR YUKAWA
###################################
Block yukawa
    5 4.700000e+00 # ymb
    6 1.730000e+02 # ymt
   15 1.777000e+00 # ymtau

###################################
## INFORMATION FOR DECAY
###################################
DECAY 6 1.491500e+00 # WT
DECAY 23 2.441404e+00 # WZ
DECAY 24 2.047600e+00 # WW
DECAY 25 6.382339e-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 0.000000e+00 # d : 0.0
DECAY 2 0.000000e+00 # u : 0.0
DECAY 3 0.000000e+00 # s : 0.0
DECAY 4 0.000000e+00 # c : 0.0
DECAY 5 0.000000e+00 # b : 0.0
DECAY 11 0.000000e+00 # e- : 0.0
DECAY 12 0.000000e+00 # ve : 0.0
DECAY 13 0.000000e+00 # mu- : 0.0
DECAY 14 0.000000e+00 # vm : 0.0
DECAY 15 0.000000e+00 # ta- : 0.0
DECAY 16 0.000000e+00 # vt : 0.0
DECAY 21 0.000000e+00 # g : 0.0
DECAY 22 0.000000e+00 # a : 0.0
#===========================================================
# QUANTUM NUMBERS OF NEW STATE(S) (NON SM PDG CODE)
#===========================================================

Block QNUMBERS 82 # gh
        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)
#***********************************************************************
# MadGraph5_aMC@NLO *
# *
# run_card.dat aMC@NLO *
# *
# This file is used to set the parameters of the run. *
# *
# Some notation/conventions: *
# *
# Lines starting with a hash (#) are info or comments *
# *
# mind the format: value = variable ! comment *
# *
# Some of the values of variables can be list. These can either be *
# comma or space separated. *
# *
# To display additional parameter, you can use the command: *
# update to_full *
#***********************************************************************
#
#*******************
# Running parameters
#*******************
#
#***********************************************************************
# Tag name for the run (one word) *
#***********************************************************************
  XS_lljj_Zh_3000_QCD = run_tag ! name of the run
#***********************************************************************
# Number of LHE events (and their normalization) and the required *
# (relative) accuracy on the Xsec. *
# These values are ignored for fixed order runs *
#***********************************************************************
 50000 = nevents ! Number of unweighted events requested
 -1.0 = req_acc ! Required accuracy (-1=auto determined from nevents)
 -1 = nevt_job! Max number of events per job in event generation.
                 ! (-1= no split).
#***********************************************************************
# Normalize the weights of LHE events such that they sum or average to *
# the total cross section *
#***********************************************************************
 average = event_norm ! valid settings: average, sum, bias
#***********************************************************************
# Number of points per itegration channel (ignored for aMC@NLO runs) *
#***********************************************************************
 0.01 = req_acc_FO ! Required accuracy (-1=ignored, and use the
                     ! number of points and iter. below)
# These numbers are ignored except if req_acc_FO is equal to -1
 5000 = npoints_FO_grid ! number of points to setup grids
 4 = niters_FO_grid ! number of iter. to setup grids
 10000 = npoints_FO ! number of points to compute Xsec
 6 = niters_FO ! number of iter. to compute Xsec
#***********************************************************************
# Random number seed *
#***********************************************************************
 1 = iseed ! rnd seed (0=assigned automatically=default))
#***********************************************************************
# Collider type and energy *
#***********************************************************************
 0 = lpp1 ! beam 1 type (0 = no PDF)
 0 = lpp2 ! beam 2 type (0 = no PDF)
 1500.0 = ebeam1 ! beam 1 energy in GeV
 1500.0 = ebeam2 ! beam 2 energy in GeV
#***********************************************************************
# PDF choice: this automatically fixes also alpha_s(MZ) and its evol. *
#***********************************************************************
 nn23nlo = pdlabel ! PDF set
 244600 = lhaid ! If pdlabel=lhapdf, this is the lhapdf number. Only
              ! numbers for central PDF sets are allowed. Can be a list;
              ! PDF sets beyond the first are included via reweighting.
#***********************************************************************
# Include the NLO Monte Carlo subtr. terms for the following parton *
# shower (HERWIG6 | HERWIGPP | PYTHIA6Q | PYTHIA6PT | PYTHIA8) *
# WARNING: PYTHIA6PT works only for processes without FSR!!!! *
#***********************************************************************
  HERWIG6 = parton_shower
  1.0 = shower_scale_factor ! multiply default shower starting
                                  ! scale by this factor
#***********************************************************************
# Renormalization and factorization scales *
# (Default functional form for the non-fixed scales is the sum of *
# the transverse masses divided by two of all final state particles *
# and partons. This can be changed in SubProcesses/set_scales.f or via *
# dynamical_scale_choice option) *
#***********************************************************************
 True = fixed_ren_scale ! if .true. use fixed ren scale
 True = fixed_fac_scale ! if .true. use fixed fac scale
 91.118 = muR_ref_fixed ! fixed ren reference scale
 91.118 = muF_ref_fixed ! fixed fact reference scale
 0 = dynamical_scale_choice ! Choose one (or more) of the predefined
           ! dynamical choices. Can be a list; scale choices beyond the
           ! first are included via reweighting
 1.0 = muR_over_ref ! ratio of current muR over reference muR
 1.0 = muF_over_ref ! ratio of current muF over reference muF
#***********************************************************************
# Reweight variables for scale dependence and PDF uncertainty *
#***********************************************************************
 1.0, 2.0, 0.5 = rw_rscale ! muR factors to be included by reweighting
 1.0, 2.0, 0.5 = rw_fscale ! muF factors to be included by reweighting
 True = reweight_scale ! Reweight to get scale variation using the
            ! rw_rscale and rw_fscale factors. Should be a list of
            ! booleans of equal length to dynamical_scale_choice to
            ! specify for which choice to include scale dependence.
 False = reweight_PDF ! Reweight to get PDF uncertainty. Should be a
            ! list booleans of equal length to lhaid to specify for
            ! which PDF set to include the uncertainties.
#***********************************************************************
# Store reweight information in the LHE file for off-line model- *
# parameter reweighting at NLO+PS accuracy *
#***********************************************************************
 False = store_rwgt_info ! Store info for reweighting in LHE file
#***********************************************************************
# ickkw parameter: *
# 0: No merging *
# 3: FxFx Merging - WARNING! Applies merging only at the hard-event *
# level. After showering an MLM-type merging should be applied as *
# well. See http://amcatnlo.cern.ch/FxFx_merging.htm for details. *
# 4: UNLOPS merging (with pythia8 only). No interface from within *
# MG5_aMC available, but available in Pythia8. *
# -1: NNLL+NLO jet-veto computation. See arxiv:1412.8408 [hep-ph]. *
#***********************************************************************
 0 = ickkw
#***********************************************************************
#
#***********************************************************************
# BW cutoff (M+/-bwcutoff*Gamma). Determines which resonances are *
# written in the LHE event file *
#***********************************************************************
 15.0 = bwcutoff
#***********************************************************************
# Cuts on the jets. Jet clustering is performed by FastJet. *
# - When matching to a parton shower, these generation cuts should be *
# considerably softer than the analysis cuts. *
# - More specific cuts can be specified in SubProcesses/cuts.f *
#***********************************************************************
 -1.0 = jetalgo ! FastJet jet algorithm (1=kT, 0=C/A, -1=anti-kT)
  0.4 = jetradius ! The radius parameter for the jet algorithm
  5.0 = ptj ! Min jet transverse momentum
  5.0 = etaj ! Max jet abs(pseudo-rap) (a value .lt.0 means no cut)
#***********************************************************************
# Cuts on the charged leptons (e+, e-, mu+, mu-, tau+ and tau-) *
# More specific cuts can be specified in SubProcesses/cuts.f *
#***********************************************************************
  5.0 = ptl ! Min lepton transverse momentum
  3.0 = etal ! Max lepton abs(pseudo-rap) (a value .lt.0 means no cut)
  0.1 = drll ! Min distance between opposite sign lepton pairs
  0.1 = drll_sf ! Min distance between opp. sign same-flavor lepton pairs
 70.0 = mll ! Min inv. mass of all opposite sign lepton pairs
 70.0 = mll_sf ! Min inv. mass of all opp. sign same-flavor lepton pairs
#***********************************************************************
# Photon-isolation cuts, according to hep-ph/9801442. When ptgmin=0, *
# all the other parameters are ignored. *
# More specific cuts can be specified in SubProcesses/cuts.f *
#***********************************************************************
  5.0 = ptgmin ! Min photon transverse momentum
  5.0 = etagamma ! Max photon abs(pseudo-rap)
  0.1 = 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)
#***********************************************************************
# Cuts associated to MASSIVE particles identified by their PDG codes. *
# All cuts are applied to both particles and anti-particles, so use *
# POSITIVE PDG CODES only. Example of the syntax is {6 : 100} or *
# {6:100, 25:200} for multiple particles *
#***********************************************************************
  {} = pt_min_pdg ! Min pT for a massive particle
  {} = pt_max_pdg ! Max pT for a massive particle
  {} = mxx_min_pdg ! inv. mass for any pair of (anti)particles
#***********************************************************************
# For aMCfast+APPLGRID use in PDF fitting (http://amcfast.hepforge.org)*
#***********************************************************************
 0 = iappl ! aMCfast switch (0=OFF, 1=prepare grids, 2=fill grids)
#***********************************************************************

Question information

Language:
English Edit question
Status:
Answered
For:
MadGraph5_aMC@NLO Edit question
Assignee:
Rikkert Frederix Edit question
Last query:
Last reply:
Revision history for this message
Rikkert Frederix (frederix) said :
#1

Dear Oscar,

You have to be more careful on how you define the 5-flavour scheme. You are using a model with a massive b quark, and a 4-flavour setup for the renormalisation conditions, etc., hence, this is not a 5-flavour scheme calculation. You should load a model with a massless b-quark (i.e., 'import model loop_sm-no_b_mass').

Furthermore, your cuts are too minimal. You are trying to use a fixed-order calculation in a phase-space region where the fixed order perturbative expansion does (most-likely) not behave well. You are including phase-space region too close to soft and collinear regions where resummation is needed. I would recommend to harden your cuts significantly.

Best regards,
Rikkert

Can you help with this problem?

Provide an answer of your own, or ask Oscar Ochoa Valeriano for more information if necessary.

To post a message you must log in.