singletop production loop_sm
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
MadGraph5_aMC@NLO |
New
|
Undecided
|
Unassigned |
Bug Description
Hi Madgraph team,
I have been testing the production of single top in the SM @ NLO with the "loop_sm" model and the restriction card "no_b_mass" (the complex mass scheme is activated). The process I am generating is the following :
generate u u > j j e+ ve [QCD] QCD<=2 QED<=4.
However, after launching MadEvent, it seems that poles are not cancelling and the event generation cannot go through...
Could you help me to point out where a mistake is being made ?
Here is the error message from the debug file
launch auto
Traceback (most recent call last):
File "/home/
return self.onecmd_
File "/home/
return func(arg, **opt)
File "/home/
self.
File "/home/
self.
File "/home/
return self.parse_
File "/home/
raise aMCatNLOError(
madgraph.
Here are my proc_card and banner :
#******
#* MadGraph5_aMC@NLO *
#* *
#* * * *
#* * * * * *
#* * * * * 5 * * * * *
#* * * * * *
#* * * *
#* *
#* *
#* VERSION 3.4.2 2023-01-20 *
#* *
#* The MadGraph5_aMC@NLO Development Team - Find us at *
#* https:/
#* *
#******
#* *
#* Command File for MadGraph5_aMC@NLO *
#* *
#* run as ./bin/mg5_aMC filename *
#* *
#******
set group_subprocesses Auto
set ignore_
set low_mem_
set complex_mass_scheme True
set include_
set gauge unitary
set loop_optimized_
set loop_color_flows False
set max_npoint_
set default_
set max_t_for_channel 99
set zerowidth_tchannel True
set nlo_mixed_expansion True
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~
import model loop_sm-no_b_mass
define p = 21 2 4 1 3 -2 -4 -1 -3 5 -5 # pass to 5 flavors
define j = p
generate u u > j j e+ ve [QCD] QCD<=2 QED<=4
output TEST_singletop_
<LesHouchesEvents version="3.0">
<header>
<!--
#******
# *
# MadGraph5_aMC@NLO *
# *
# Going Beyond *
# *
# http://
# http://
# http://
# *
# The MadGraph5_aMC@NLO team *
# *
#......
# *
# This file contains all the information necessary to reproduce *
# the events generated: *
# *
# 1. software version *
# 2. proc_card : code generation info including model *
# 3. param_card : model primary parameters in the LH format *
# 4. run_card : running parameters (collider and cuts) *
# 5. pythia_card : present only if pythia has been run *
# 6. pgs_card : present only if pgs has been run *
# 7. delphes_cards : present only if delphes has been run *
# *
# *
#******
-->
<MGVersion>
3.4.2
</MGVersion>
<MGRunCard>
<![CDATA[
#******
# MadGraph5_aMC@NLO *
# *
# run_card.dat aMC@NLO *
# *
# This file is used to set the parameters of the run. *
# *
# Some notation/
# *
# 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) *
#******
tag_1 = 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 *
#******
10000 = 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).
#******
# Output format
#******
-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/bias. Normalization of the weight in the LHEF
#******
# Number of points per itegration channel (ignored for aMC@NLO runs) *
#******
0.01 = req_acc_fo ! Required accuracy (-1=ignored, and use the
# 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 *
#******
0 = iseed ! rnd seed (0=assigned automatically=
#******
# Collider type and energy *
#******
1 = lpp1 ! beam 1 type (0 = no PDF)
1 = lpp2 ! beam 2 type (0 = no PDF)
6500.0 = ebeam1 ! beam 1 energy in GeV
6500.0 = 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!!!! *
#******
PYTHIA8 = parton_shower
1.0 = shower_scale_factor ! multiply default shower starting
#******
# 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/
# dynamical_
#******
False = fixed_ren_scale ! if .true. use fixed ren scale
False = 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
-1 = dynamical_
! 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_
! 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://
# 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*
# written in the LHE event file *
#******
15.0 = bwcutoff
#******
# Cuts on the jets. Jet clustering is performed by FastJet. *
# - If gamma_is_j, photons are also clustered with jets. *
# Otherwise, they will be treated as tagged particles and photon *
# isolation will be applied. Note that photons in the real emission *
# will always be clustered with QCD partons. *
# - 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)
0.7 = jetradius ! The radius parameter for the jet algorithm
10.0 = ptj ! Min jet transverse momentum
-1.0 = etaj ! Max jet abs(pseudo-rap) (a value .lt.0 means no cut)
False = gamma_is_j ! Wether to cluster photons as jets or not
#******
# Cuts on the charged leptons (e+, e-, mu+, mu-, tau+ and tau-) *
# More specific cuts can be specified in SubProcesses/cuts.f *
#******
0.0 = ptl ! Min lepton transverse momentum
-1.0 = etal ! Max lepton abs(pseudo-rap) (a value .lt.0 means no cut)
0.0 = drll ! Min distance between opposite sign lepton pairs
0.0 = drll_sf ! Min distance between opp. sign same-flavor lepton pairs
0.0 = mll ! Min inv. mass of all opposite sign lepton pairs
30.0 = mll_sf ! Min inv. mass of all opp. sign same-flavor lepton pairs
#******
# Fermion-photon recombination parameters *
# If Rphreco=0, no recombination is performed *
#******
0.1 = rphreco ! Minimum fermion-photon distance for recombination
-1.0 = etaphreco ! Maximum abs(pseudo-rap) for photons to be recombined (a value .lt.0 means no cut)
False = lepphreco ! Recombine photons and leptons together
False = quarkphreco ! Recombine photons and quarks together
#******
# Photon-isolation cuts, according to hep-ph/9801442 *
# Not applied if gamma_is_j *
# When ptgmin=0, all the other parameters are ignored *
# More specific cuts can be specified in SubProcesses/cuts.f *
#******
20.0 = ptgmin ! Min photon transverse momentum
-1.0 = etagamma ! Max photon abs(pseudo-rap)
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)
#******
# 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
#******
# Use PineAPPL to generate PDF-independent fast-interpolation grid *
# (https:/
#******
False = pineappl ! PineAPPL switch
#******
]]>
</MGRunCard>
<slha>
#######
## PARAM_CARD AUTOMATICALY GENERATED BY MG5 ####
#######
#######
## INFORMATION FOR MASS
#######
BLOCK MASS #
6 1.730000e+02 # mt
15 1.777000e+00 # mta
23 9.118800e+01 # mz
24 8.041900e+01 # mw
25 1.250000e+02 # mh
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
5 0.000000e+00 # b : 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
#######
## INFORMATION FOR SMINPUTS
#######
BLOCK SMINPUTS #
1 1.325070e+02 # aewm1
3 1.190000e-01 # as (note that parameter not used if you use a pdf set)
#######
## 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
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
#######
## INFORMATION FOR QNUMBERS 82
#######
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/
</slha>
<MGShowerCard>
<![CDATA[
#******
# MadGraph5_aMC@NLO *
# *
# shower_card.dat aMC@NLO *
# *
# This file is used to set the parameters for the shower. *
# *
# Some notation/
# *
# Lines starting with a hash (#) are info or comments *
# *
# mind the format: variable = value # comment *
#******
#
#******
# Shower settings *
#******
# Number of events, jobs, errors, and random seeds *
#******
nevents = -1 # N evts to shower (< 0 = all)
nsplit_jobs = 1 # N jobs to run in parallel (< 100!!)
combine_td = T # combine the topdrawer/HwU files if nsplit_jobs>1
maxprint = 2 # N evts to print in the log
maxerrs = 0.1 # max fraction of errors
rnd_seed = 0 # 1st random seed (0 = default)
rnd_seed2 = 0 # 2nd random seed (0 = default) !ONLY FOR HWERIG6!
#******
# PDFs and non-perturbative modelling *
#******
pdfcode = 1 # 0 = internal, 1 = same as NLO, other = lhaglue
ue_enabled = F # underlying event
hadronize = T # hadronisation on/off !IGNORED BY HERWIG6!
lambda_5 = -1 # Lambda_5 (< 0 = default) !IGNORED BY PYTHIA8!
#******
# Stable or unstable particles *
#******
b_stable = F # set B hadrons stable
pi_stable = T # set pi0's stable
wp_stable = F # set w+'s stable
wm_stable = F # set w-'s stable
z_stable = F # set z0's stable
h_stable = F # set Higgs' stable
tap_stable = F # set tau+'s stable
tam_stable = F # set tau-'s stable
mup_stable = F # set mu+'s stable
mum_stable = F # set mu-'s stable
#******
# Mass of the b quark *
#******
b_mass = -1 # if < 0 = read from SubProcesses/
#******
# Special settings *
#******
is_4lep = F # T if 4-lepton production !ONLY FOR PYTHIA6!
is_bbar = F # T if bb~ production !ONLY FOR HERWIG6!
#******
# FxFx merging parameters !ONLY FOR PYTHIA8!
#******
Qcut = -1.0 # Merging scale
njmax = -1 # Maximal multiplicity in the merging.
# # -1 means guessed from the process definition
#******
# Decay channels *
#******
# Syntax for HERWIG6 *
# DM_I = M > D1 D2 @ BR @ ME *
# corresponding to call to HWMODK(
# I < 100, M is the decaying resonance, D1, D2, ... are the decay *
# products (up to five), BR is the branching ratio and ME is the type *
# of matrix element to be used in the decay. *
# BR's are correctly understood only if they add up to 1, and only if *
# no more than three modes are required for a given resonance. *
# WARNING: the order of decay products in > 2-body decays IS RELEVANT. *
# *
# Syntax for PYTHIA6 *
# DM_I = M > D1 D2 @ BR @ ME *
# WARNING: turning hadronisation off disables top decays *
# WARNING: 1 -> n decays (with n > 2) are handled through a sequence *
# of 1 -> 2 decays. *
# WARNING: entries BR and ME are ignored *
# *
# Syntax for HERWIG++ *
# DM_I = M > D1 D2 @ BR @ ME *
# WARNING: entries BR and ME are ignored *
# *
# Syntax for PYTHIA8 *
# DM_I = M:onIfAny = D1 D2 *
# or similar, according to the offical PYTHIA8 decay syntax, see *
# the online PYTHIA8 manual *
# WARNING: 1 -> n decays (with n > 2) are handled through a sequence *
# of 1 -> 2 decays. *
# *
# Examples *
# Z -> e+ e- or mu+ mu- with BR = 0.5 each, HERWIG6 *
# DM_1 = 23 > -11 11 @ 0.5d0 @ 100
# DM_2 = 23 > -13 13 @ 0.5d0 @ 100
# H -> ta+ ta- with BR = 1, HERWIG6 or HERWIG++ *
# DM_3 = 25 > -15 15 @ 1.0d0 @ 0
# t -> ve e+ b with BR = 1, HERWIG6 or HERWIG++ *
# DM_4 = 6 > 12 -11 5 @ 1d0 @ 100
# t -> ve e+ b with BR = 1, PYTHIA6 *
# DM_5 = 6 > 24 5 @ 1d0 @ 100
# DM_6 = 24 > 12 -11 @ 1d0 @ 100
# W+ -> ve e+, W- -> vm~ mu-, PYTHIA8 *
# DM_1 = 24:onMode = off
# DM_2 = 24:onPosIfAny = 11 12
# DM_3 = 24:onNegIfAny = 13 14
# W+ -> ve e+, W- -> ve~ e- and vm~ mu-, PYTHIA8 *
# DM_1 = 24:onMode = off
# DM_2 = 24:onIfAny = 11 12
# DM_3 = 24:onNegIfAny = 13 14
#******
# Extra libraries/analyses *
#******
# The following lines need to be changed if the user does not want to *
# create a StdHEP/HepMC file, but to directly run an own analysis (to *
# be placed in HWAnalyzer or analogous MCatNLO subfolders). *
# Please use files in those folders as examples. *
# Remember that if your analysis uses hbook or is in the HwU format, *
# you must also add to hbook.o or HwU.o to the ANALYSE list as well. *
#******
extralibs = pythia8 z dl stdc++ # Extra-libraries (not LHAPDF)
extrapaths = ../lib /home/jtouchequ
INCLUDEPATHS = # Path to header files needed by c++
ANALYSE = # User's analysis and histogramming
]]>
</MGShowerCard>
<run_settings>
order = NLO
fixed_order = OFF
shower = PYTHIA8
madspin = OFF
reweight = OFF
madanalysis = OFF
runshower = True
</run_settings>
</header>
</LesHouchesEvents>
Thank you in advance !
Best,
Julien
Hi,
You can not ask for "u u" initial state at NLO accuracy since this is not an infrared safe information.
This might prevent some ISR to be generated and therefore missing the cancelation of those ISR with the generated loop amplitude.
A second potential issue is the inclusion of the top resonances, this does not seems to be the case here (likely due to your u u constraint) but will likely be problematic if you ask for all light flavor in the initial state.
Cheers,
Olivier
> On 15 Jun 2023, at 15:27, Julien Touchèque <email address hidden> wrote: jtoucheque/ MG5_aMC_ v3_4_0/ madgraph/ interface/ extended_ cmd.py" , line 1544, in onecmd orig(line, **opt) jtoucheque/ MG5_aMC_ v3_4_0/ madgraph/ interface/ extended_ cmd.py" , line 1493, in onecmd_orig jtoucheque/ MG5_aMC_ v3_4_0/ madgraph/ interface/ amcatnlo_ run_interface. py", line 1783, in do_launch jtoucheque/ MG5_aMC_ v3_4_0/ madgraph/ interface/ amcatnlo_ run_interface. py", line 5407, in compile tests(test, this_dir) jtoucheque/ MG5_aMC_ v3_4_0/ madgraph/ interface/ amcatnlo_ run_interface. py", line 5420, in check_tests check_poles_ log(pjoin( dir, '%s.log' % test)) jtoucheque/ MG5_aMC_ v3_4_0/ madgraph/ interface/ amcatnlo_ run_interface. py", line 5453, in parse_check_ poles_log 'Poles do not cancel, run cannot continue') interface. amcatnlo_ run_interface. aMCatNLOError: Poles do not cancel, run cannot continue ******* ******* ******* ******* ******* ******* ******* ***** /server06. fynu.ucl. ac.be/projects/ madgraph *
>
> Public bug reported:
>
> Hi Madgraph team,
>
> I have been testing the production of single top in the SM @ NLO with the "loop_sm" model and the restriction card "no_b_mass" (the complex mass scheme is activated). The process I am generating is the following :
> generate u u > j j e+ ve [QCD] QCD<=2 QED<=4.
>
> However, after launching MadEvent, it seems that poles are not
> cancelling and the event generation cannot go through...
>
> Could you help me to point out where a mistake is being made ?
>
>
> Here is the error message from the debug file
> launch auto
> Traceback (most recent call last):
> File "/home/
> return self.onecmd_
> File "/home/
> return func(arg, **opt)
> File "/home/
> self.compile(mode, options)
> File "/home/
> self.check_
> File "/home/
> return self.parse_
> File "/home/
> raise aMCatNLOError(
> madgraph.
>
>
> Here are my proc_card and banner :
> #******
> #* MadGraph5_aMC@NLO *
> #* *
> #* * * *
> #* * * * * *
> #* * * * * 5 * * * * *
> #* * * * * *
> #* * * *
> #* *
> #* *
> #* VERSION 3.4.2 2023-01-20 *
> #* *
> #* The MadGraph5_aMC@NLO Development Team - Find us at *
> #* https:/
> #* ...