Dileptonic ttbar decay (NLO) launch auto error
Hi
I am running the following process
generate p p > t t~ [QCD]
followed by the specified dileptonic decay:
where in the Madspin card, I specify the decay as follows:
decay t > w+ b, w+ > l+ vl
decay t~ > w- b~, w- > l- vl~
For shower, I use Pythia8 and MadAnalysis card is also switched on. The following error crops up:
Error detected in "launch auto "
write debug file /eos/home-
If you need help with this issue, please, contact us on https:/
str : An error occurred during event generation. The event file has not been created:
Overwrite the event weights?
give '0' to keep original weights;
give '1' to overwrite the weights to sum to the Xsec;
give '2' to overwrite the weights to average to the Xsec (=default)
give '3' to overwrite the weights to either +/- 1.
step # 0
found 5 files, bunch number is 1
Now note that this error is not there but pops up often here and there. Sometimes I can run the specified process without any problems while other times, it crashes. Here I am trying to vary the mass of the top quark, only slightly while keeping the width constant while other times I change the width as well but only slightly. I have attached the debug file below:
#******
#* MadGraph5_aMC@NLO *
#* *
#* * * *
#* * * * * *
#* * * * * 5 * * * * *
#* * * * * *
#* * * *
#* *
#* *
#* VERSION 3.5.4 2024-04-05 *
#* *
#* The MadGraph5_aMC@NLO Development Team - Find us at *
#* https:/
#* and *
#* http://
#* *
#******
#* *
#* Command File for aMCatNLO *
#* *
#* run as ./bin/aMCatNLO.py filename *
#* *
#******
launch auto
Traceback (most recent call last):
File "/afs/cern.
return self.onecmd_
File "/afs/cern.
return func(arg, **opt)
File "/afs/cern.
evt_file = self.run(mode, options)
File "/afs/cern.
return self.reweight_
File "/afs/cern.
raise aMCatNLOError('An error occurred during event generation. ' + \
madgraph.
Overwrite the event weights?
give '0' to keep original weights;
give '1' to overwrite the weights to sum to the Xsec;
give '2' to overwrite the weights to average to the Xsec (=default)
give '3' to overwrite the weights to either +/- 1.
2
step # 0
get_orderstags
get_orderstags
found 5 files, bunch number is 1
Value of current Options:
exrootana
cluster_
mg5amc_
output_
acknowledged_
ignore_
low_mem_
complex_
include_
loop_
max_
default_
nlo_
automatic_
notificat
Any help is appreciated.
Thank you
Aminul
Question information
- Language:
- English Edit question
- Status:
- Solved
- Assignee:
- No assignee Edit question
- Solved by:
- Olivier Mattelaer
- Solved:
- Last query:
- Last reply:
|
Revision history for this message
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#1 |
Hi,
Looks like you have setup everything like for running on lxplus but you are running in multi-core mode not on cluster mode.
So do you run on the front-end or within a job allocation (not handle by us).
If the first, this is likely not something allowed (so the system/sys admin can decide to kill process at any time which might explain your situation).
Or do you run within one of your own machine of the CERN cloud?
One point that worried me in your run is that you seems to have spaces in your path, this is something which is strongly discouraged on unix since it can make code to behave in weird way.
Finally do you have the content of the file /eos/home-
Concerning the width, the syntax:
generate p p > t t~ [QCD]
will generate the events with zero width (to preserve gauge invariance)
So they are no point to vary the width in that step.
For the decay part (madspin), varying the width can make sense, but in that case you have to provide the FULL branching ratio information within the param_card (for both top and W) otherwise, Madspin will recompute the total width and ignore the one you provide.
> On 25 May 2024, at 16:15, Aminul Hossain <email address hidden> wrote:
>
>
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Revision history for this message
|
#2 |
Hi
Yes, I am running it on the Lxplus cluster. I have added run_01_
#******
#* MadGraph5_aMC@NLO *
#* *
#* * * *
#* * * * * *
#* * * * * 5 * * * * *
#* * * * * *
#* * * *
#* *
#* *
#* VERSION 3.5.4 2024-04-05 *
#* *
#* The MadGraph5_aMC@NLO Development Team - Find us at *
#* https:/
#* and *
#* http://
#* *
#******
#* *
#* Command File for aMCatNLO *
#* *
#* run as ./bin/aMCatNLO.py filename *
#* *
#******
launch auto
Traceback (most recent call last):
File "/afs/cern.
return self.onecmd_
File "/afs/cern.
return func(arg, **opt)
File "/afs/cern.
self.
File "/afs/cern.
raise aMCatNLOError(
madgraph.
Value of current Options:
exrootana
cluster_
mg5amc_
output_
acknowledged_
ignore_
low_mem_
complex_
include_
loop_
max_
default_
nlo_
automatic_
notificat
I have also added mcatnlo.log (see below)
gfortran -O -fno-automatic -ffixed-
gfortran -O -fno-automatic -ffixed-
gfortran -O -fno-automatic -ffixed-
../srcHerwig/
5001 | DICE = JMRNDM(2,DUM)
| 1
Warning: Rank mismatch in argument ‘seed’ at (1) (rank-1 and scalar)
../srcHerwig/
5013 | DICE = JMRNDM(2,DUM)
| 1
Warning: Rank mismatch in argument ‘seed’ at (1) (rank-1 and scalar)
../srcHerwig/
5844 | CALL PARTN( NDIM, A, B, 1.0, 10000 )
| 1
Warning: Actual argument contains too few elements for dummy argument ‘gminus’ (2/10) at (1)
../srcHerwig/
2740 | CALL USRINT(
| 1
Warning: Rank mismatch in argument ‘uminus’ at (1) (scalar and rank-1)
../srcHerwig/
2764 | CALL QUASI(XX,
| 1
Warning: Rank mismatch in argument ‘x’ at (1) (rank-2 and scalar)
../srcHerwig/
3578 | 1(NDIM,
| 1
Warning: Actual argument contains too few elements for dummy argument ‘tree’ (4/4000) at (1)
../srcHerwig/
3629 | CALL BOUNDS(
| 1
Warning: Actual argument contains too few elements for dummy argument ‘tree’ (4/4000) at (1)
../srcHerwig/
3634 | 1(NDIM,
| 1
Warning: Actual argument contains too few elements for dummy argument ‘tree’ (4/4000) at (1)
../srcHerwig/
3645 | CALL TREAUD(
| 1
Warning: Actual argument contains too few elements for dummy argument ‘tree’ (4/4000) at (1)
../srcHerwig/
3651 | CALL TREAUD(
| 1
Warning: Actual argument contains too few elements for dummy argument ‘tree’ (4/4000) at (1)
../srcHerwig/
3653 | CALL NODAUD(
| 1
Warning: Actual argument contains too few elements for dummy argument ‘tree’ (4/4000) at (1)
../srcHerwig/
4734 | CALL PARTN( NDIM, A, B, 1.0, 10000 )
| 1
Warning: Actual argument contains too few elements for dummy argument ‘gminus’ (2/10) at (1)
../srcHerwig/
6269 | CALL PARTN( NDIM, A, B, 1.0, 10000 )
| 1
Warning: Actual argument contains too few elements for dummy argument ‘gminus’ (3/10) at (1)
../srcHerwig/
2308 | CALL JMUCPY(
| 1
Warning: Rank mismatch in argument ‘a’ at (1) (rank-1 and scalar)
../srcHerwig/
2612 | 100 CALL RANUMS(R,1)
| 1
Warning: Rank mismatch in argument ‘x’ at (1) (rank-1 and scalar)
../srcHerwig/
2638 | 160 CALL RANUMS(R,1)
| 1
Warning: Rank mismatch in argument ‘x’ at (1) (rank-1 and scalar)
../srcHerwig/
4519 | CALL BOUNDS(
| 1
Warning: Actual argument contains too few elements for dummy argument ‘tree’ (4/4000) at (1)
gfortran -O -fno-automatic -ffixed-
gfortran -O -fno-automatic -ffixed-
gfortran -O -fno-automatic -ffixed-
gfortran -O -fno-automatic -ffixed-
gfortran -O -fno-automatic -ffixed-
gfortran -O -fno-automatic -ffixed-
gfortran -O -fno-automatic -ffixed-
gfortran -O -fno-automatic -ffixed-
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mcf_stdcm1_
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mcf_StdHep_
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mcf_hepev4_
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mcfio_Util1.
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mcfio_Direct.
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mcfio_Direct.
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mcfio_Block.
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mcfio_Block.
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mcf_NTuIOFiles.
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mcf_evt_
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collect2: error: ld returned 1 exit status
make: *** [/eos/home-
mv: cannot stat 'HW_EXE_LHAPDF': No such file or directory
chmod: cannot access '/eos/home-
***** Now ready for showering 10000 events with HERWIG6
mv: cannot stat 'HW_EXE_LHAPDF': No such file or directory
|
Revision history for this message
|
#3 |
Hi,
But this is not a run for pythia8? Looks like you try to run for Herwig6.
Herwig6 is not supported anymore and depends on a (non supported) library stdhep.
This is compilation of that library which seems to be problematic since your system does not have the xdr library automatically linked (see https:/
Given that we are not the authors of any of these libraries and that we strongly encourage to move to modern parton-shower (also in term of physics accuracy), this is not something that we will fix (but obviously we will accept PR if someone investigate such issue)
Cheers,
Olivier
|
Revision history for this message
|
#4 |
Hi
I changed it pythia8 and ran the process once again. All went well until the last moment which gave the following error:
Command "launch auto " interrupted with error:
MadGraph5Error : MadAnalysis5 failed to produce the reconstructed event file for reconstruction 'BasicReco'.
Please report this bug on https:/
More information is found in '/eos/home-
Please attach this file to your report.
Attached is the bug report:
#******
#* MadGraph5_aMC@NLO *
#* *
#* * * *
#* * * * * *
#* * * * * 5 * * * * *
#* * * * * *
#* * * *
#* *
#* *
#* VERSION 3.5.4 2024-04-05 *
#* *
#* The MadGraph5_aMC@NLO Development Team - Find us at *
#* https:/
#* and *
#* http://
#* *
#******
#* *
#* Command File for aMCatNLO *
#* *
#* run as ./bin/aMCatNLO.py filename *
#* *
#******
launch auto
Traceback (most recent call last):
File "/afs/cern.
return self.onecmd_
File "/afs/cern.
return func(arg, **opt)
File "/afs/cern.
self.
File "/afs/cern.
stop = Cmd.onecmd_
File "/afs/cern.
return func(arg, **opt)
File "/afs/cern.
return self.run_
File "/afs/cern.
raise MadGraph5Error(
madgraph.
Value of current Options:
exrootana
cluster_
mg5amc_
output_
acknowledged_
ignore_
low_mem_
complex_
include_
loop_
max_
default_
nlo_
automatic_
notificat
#******
#* MadGraph5_aMC@NLO *
#* *
#* * * *
#* * * * * *
#* * * * * 5 * * * * *
#* * * * * *
#* * * *
#* *
#* *
#* VERSION 3.5.4 2024-04-05 *
#* *
#* 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 False
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
generate p p > t t~ [QCD]
output /eos/user/
#######
## PARAM_CARD AUTOMATICALY GENERATED BY MG5 ####
#######
#######
## 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
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(
#######
## INFORMATION FOR SMINPUTS
#######
BLOCK SMINPUTS #
1 1.325070e+02 # aewm1
2 1.166390e-05 # gf
3 1.190000e-01 # as (note that parameter not used if you use a pdf set)
#######
## INFORMATION FOR YUKAWA
#######
BLOCK YUKAWA #
5 4.700000e+00 # ymb
6 1.730000e+02 # ymt
15 1.777000e+00 # ymtau
#######
## 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/
#######
## INFORMATION FOR DECAY
#######
DECAY 1 0.000000e+00 #
DECAY 2 0.000000e+00 #
DECAY 3 0.000000e+00 #
DECAY 4 0.000000e+00 #
DECAY 5 0.000000e+00 #
DECAY 6 1.491500e+00 #
1.000000e+00 2 5 24 # 1.4915
DECAY 11 0.000000e+00 #
DECAY 12 0.000000e+00 #
DECAY 13 0.000000e+00 #
DECAY 14 0.000000e+00 #
DECAY 15 0.000000e+00 #
DECAY 16 0.000000e+00 #
DECAY 21 0.000000e+00 #
DECAY 22 0.000000e+00 #
DECAY 23 2.441404e+00 #
DECAY 24 2.047600e+00 #
DECAY 25 6.382339e-03 #
#******
# 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 *
# 0 = no PDF *
# 1/-1 = proton/antiproton *
# 3/-3 = electron/positron with ISR/Beamstrahlung; *
# 4/-4 = muon/antimuon with ISR/Beamstrahlung; *
#******
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.
0 = pdfscheme ! the scheme of the input PDFs. 0->MSbar; 1->DIS
! 2->eta (leptonic); 3->beta (leptonic)
! 4->mixed (leptonic); 6->delta (leptonic)
#******
# The following block is specific to lepton collisions (lpp=+-3) *
#******
True = photons_from_lepton ! whether to include or not photons from
#******
# 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
False = mcatnlo_delta ! use MC@NLO-Delta matching, arXiv:2002.12716
#******
# 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
#******
# Customization of the code. List of files containing user hook function
#******
= custom_fcts ! List of files containing user hook function
#******
# 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
#******
# Folding parameters for S-events to reduce the number of negatively *
# weighted events. Allowed values are 1, 2, 4 or 8 for each of the *
# three variables. Typically, folding in xi_i or y_ij results in the *
# largest reduction of negatively weighted events. (arXiv:2002.12716) *
#******
1, 1, 1 = folding ! correspond to folding in xi_i, y_ij, and phi_i
#******
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#5 |
Hi,
So here on the side of MG5aMC everything went smoothly but you crash in the external (and optional) library madanalysis5. I'm sorry but I have not real help here but those two (quite stupid advice)
1) run without MA5
2) report this issue to MA5 author: https:/
Sorry not really to help you on this one.
Olivier
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#6 |
Hi
Thank you for the suggestion, indeed running without MA5 fixes the problem. I have a simple query regarding the madspin card issue mentioned earlier:
> > For the decay part (madspin), varying the width can make sense, but in that case you have to provide the FULL branching ratio information within the param_card (for both top and W) otherwise, Madspin will recompute the total width and ignore the one you provide.
I am trying to see whether there are variations in the differential cross section as a function of dilepton mass as a result of top width variations. It would seem that varying the top mass would lead to variations in other standard model parameters, such as the top width, according to https:/
Does naively setting the top width to a specific value other than the default value in the parameter card do anything? Does MadWidth take into account the new value specified in the parameter card or are there other parameters that also needs to be specified? In your previous answer you mentioned that one needs to include information regarding branching ratio. Where in the parameter card do we specify those?
Based on the paper, https:/
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#7 |
Hi,
I'm one of the author of 1402.1178, and yes the widths are not free parameters of the model. In 1402.1178, we do compute those widths at LO which provides one number, but obviously you might prefer more accurate computation.
If your width is set to "auto", then you will not have any issue at all. Since madwidth (1402.1178) is anyway call --even before madspin-- and the information of madwith includes both the total width but also the branching ratio.
So in that case the re-computation of width should not happen (since already provided). Even if it does the computation will be identical and therefore the result will be consistent.
Cheers,
Olivier
PS (Not relevant for the top mass but I include it here if someone else read this thread) Madspin calls madwidth but restrict madwidth to only two body decay, so this can be problematic if 3 body decay are large. In such case it is important to be sure that madspin does not recompute the width.
> On 2 Jun 2024, at 20:50, Aminul Hossain <email address hidden> wrote:
>
> Question #816086 on MadGraph5_aMC@NLO changed:
> https:/
>
> Aminul Hossain posted a new comment:
> Hi
>
> Thank you for the suggestion, indeed running without MA5 fixes the
> problem. I have a simple query regarding the madspin card issue
> mentioned earlier:
>
>>> For the decay part (madspin), varying the width can make sense, but
> in that case you have to provide the FULL branching ratio information
> within the param_card (for both top and W) otherwise, Madspin will
> recompute the total width and ignore the one you provide.
>
> I am trying to see whether there are variations in the dileption mass
> cross section as a result of top width variations. It would seem that
> varying the top mass would lead to variations in other standard model
> parameters, such as the top width, according to
> https:/
> in the case where both the top and Z width were set to auto. Thereafter
> MadWidth is used to compute the total width overwriting the original
> param card.dat file.
>
> Does naively setting the top width to a specific value other than the
> default value in the parameter card do anything? Does MadWidth take into
> account the new value specified in the parameter card or are there other
> parameters that also needs to be specified? In your previous answer you
> mentioned that one needs to include information regarding branching
> ratio. Where in the parameter card do we specify those?
>
> Based on the paper, https:/
> each time a new top mass is specified, the width needs to be re-
> evaluated making the default top width value in the parameter card
> obsolete.
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.
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#8 |
Thanks Olivier Mattelaer, that solved my question.
