Diff: [QED] and [ noborn=QED] process
Hello,
My questions are:
1) What are the differences between generate [QED] process and [noborn=QED] process at loop_qcd_qed_sm?
2) Why when I simulate e+ e- > z h [QED] the program fail but when instead of [QED] I use [noborn=QED] the program doesn't fail? The model that MG5 uses is loop_qcd_qed_sm
Thanks,
Francisco
Question information
- Language:
- English Edit question
- Status:
- Answered
- Assignee:
- marco zaro Edit question
- Last query:
- Last reply:
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#1 |
The syntax [noborn=QED] is the syntax for loop-induced processes.
It instruct MG5aMC to not try to do
1) NLO computation
2) to not try to generate tree-level amplitude.
If you do have tree-level amplitude (like you do have for e+ e- > z h. The syntax does not have any physical meaning.
For the issue concerning e+ e- > z h [QED], I will let Marco reply. But can you give more detail?
Cheers,
Olivier
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#2 |
Hi,
About 2)
What error do you get?
You can lool here
https:/
For further details
Let us know
Marco
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#3 |
This is on my home computer
#******
#* MadGraph5_aMC@NLO *
#* *
#* * * *
#* * * * * *
#* * * * * 5 * * * * *
#* * * * * *
#* * * *
#* *
#* *
#* VERSION 3.4.1 2022-09-01 *
#* *
#* The MadGraph5_aMC@NLO Development Team - Find us at *
#* https:/
#* and *
#* http://
#* *
#******
#* *
#* Command File for aMCatNLO *
#* *
#* run as ./bin/aMCatNLO.py filename *
#* *
#******
launch auto --name run_240GeV
Traceback (most recent call last):
File "/Users/
return self.onecmd_
File "/Users/
return func(arg, **opt)
File "/Users/
self.
File "/Users/
self.
File "/Users/
return self.parse_
File "/Users/
content = open(log).read()
FileNotFoundError: [Errno 2] No such file or directory: '/Users/
Related File: /Users/
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 3.4.1 2022-09-01 *
#* *
#* 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_qcd_qed_sm
define p = 21 2 4 1 3 -2 -4 -1 -3 5 -5 22 # pass to 5 flavors
define j = p
generate e+ e- > h z [QED]
output 12Test
#######
## PARAM_CARD AUTOMATICALY GENERATED BY MG5 ####
#######
#######
## INFORMATION FOR MASS
#######
BLOCK MASS #
6 1.733000e+02 # mt
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
15 0.000000e+00 # ta- : 0.0
16 0.000000e+00 # vt : 0.0
21 0.000000e+00 # g : 0.0
22 0.000000e+00 # a : 0.0
9000002 9.118800e+01 # ghz : mz
9000003 8.041900e+01 # ghwp : mw
9000004 8.041900e+01 # ghwm : mw
250 9.118800e+01 # g0 : mz
251 8.041900e+01 # g+ : mw
#######
## INFORMATION FOR SMINPUTS
#######
BLOCK SMINPUTS #
1 1.289300e+02 # aewm1
3 1.190000e-01 # as (note that parameter not used if you use a pdf set)
#######
## INFORMATION FOR YUKAWA
#######
BLOCK YUKAWA #
6 1.733000e+02 # ymt
#######
## INFORMATION FOR DECAY
#######
DECAY 6 1.367280e+00 # wt
DECAY 23 2.488830e+00 # wz
DECAY 24 2.084650e+00 # ww
DECAY 25 4.187180e-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
DECAY 250 2.488830e+00 # g0 : wz
DECAY 251 2.084650e+00 # g+ : ww
#######
## 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/
#######
## 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/
#######
## 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/
#######
## 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/
#######
## INFORMATION FOR QNUMBERS 9000005
#######
BLOCK QNUMBERS 9000005 # 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/
#######
## INFORMATION FOR QNUMBERS 250
#######
BLOCK QNUMBERS 250 # g0
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 0 # particle/
#######
## INFORMATION FOR QNUMBERS 251
#######
BLOCK QNUMBERS 251 # g+
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/
#******
# 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 = lpp1 ! beam 1 type (0 = no PDF)
0 = lpp2 ! beam 2 type (0 = no PDF)
120.0 = ebeam1 ! beam 1 energy in GeV
120.0 = 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
#******
# 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)
True = 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)
True = lepphreco ! Recombine photons and leptons together
True = 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
#******
and I also get a lot of warnings regarding gfortran:
WARNING: fct <function compile_dir at 0x108070a60> does not return 0. Stopping the code in a clean way. The error was:
A compilation Error occurs when trying to compile /Users/
On my work computer I have:
WARNING: No integration channels found for contribution P0_epem_hz
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Revision history for this message
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#4 |
Hi,
In the above comment, I copy my log file.
I'm trying to generate the process e+ e- > z h with the Higgs boson self-coupling via loop diagram so I used [QED] and fails, next I try [noborn = QED] and the program runs.
Thanks,
Francisco
P.S: Is possible to generate e+ e- > z h [ noborn =QED] with "add process e+ e- > z h " and change the dynamical_
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Revision history for this message
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#5 |
Hi Francisco,
For the case with [QED], (NLO EW corrections) you must follow the instructions in the FAQ i posted above
Best wishes
Marco
Can you help with this problem?
Provide an answer of your own, or ask Francisco Casalinho for more information if necessary.
