Quartic interaction not taken into account

HI,

Difficult to comment that much without the UFO model./
So I can only make some guess here:
1) Did you have check that you have the quartic interaction Feynman diagram?
2) One "limitation" of our phase-space integrator is that it is based on three point interaction.
The issue with that is that if all the three point interaction have zero coupling, the code faces a 0 divided by zero and crash.

Cheers,

Olivier

> On 22 Jan 2019, at 16:47, Alessandro Davoli <email address hidden> wrote:
>
> New question #677995 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/677995
>
> Hi,
>
> I implemented a Composite Higgs model, where (among the others) there are interactions between the Higgs and a singlet Eta. I am interested in the process Eta Eta > h h
>
> The relevant interactions are
>
> - 1/4 lambdaEta Eta^2 H^2 - gEta/2 vev Eta^2 H + 1/2 massHiggs^2/vev^2 lambdaH vev H^3,
>
> where lambdaH is an internal parameter, which however does not depend on the other two.
>
> It seems that the quartic interaction is not taken into account, given that if I set gEta to 0 I get the following error (and if I set it to very small values I get an almost vanishing cross section).
>
> Do you have any clue of what's going on?
>
> Thanks
> Alessandro
>
>
> #************************************************************
> #* MadGraph5_aMC@NLO/MadEvent *
> #* *
> #* * * *
> #* * * * * *
> #* * * * * 5 * * * * *
> #* * * * * *
> #* * * *
> #* *
> #* *
> #* VERSION 2.6.4 2018-11-09 *
> #* *
> #* The MadGraph5_aMC@NLO Development Team - Find us at *
> #* https://server06.fynu.ucl.ac.be/projects/madgraph *
> #* *
> #************************************************************
> #* *
> #* Command File for MadEvent *
> #* *
> #* run as ./bin/madevent.py filename *
> #* *
> #************************************************************
> generate_events run_01
> Traceback (most recent call last):
> File "/Users/alessandrodavoli/Library/MG5_aMC_v2_6_4/madgraph/interface/extended_cmd.py", line 1501, in onecmd
> return self.onecmd_orig(line, **opt)
> File "/Users/alessandrodavoli/Library/MG5_aMC_v2_6_4/madgraph/interface/extended_cmd.py", line 1450, in onecmd_orig
> return func(arg, **opt)
> File "/Users/alessandrodavoli/Library/MG5_aMC_v2_6_4/madgraph/interface/madevent_interface.py", line 2469, in do_generate_events
> self.run_generate_events(switch_mode, args)
> File "/Users/alessandrodavoli/Library/MG5_aMC_v2_6_4/madgraph/interface/common_run_interface.py", line 6801, in new_fct
> original_fct(obj, *args, **opts)
> File "/Users/alessandrodavoli/Library/MG5_aMC_v2_6_4/madgraph/interface/madevent_interface.py", line 2511, in run_generate_events
> self.exec_cmd('refine %s' % nb_event, postcmd=False)
> File "/Users/alessandrodavoli/Library/MG5_aMC_v2_6_4/madgraph/interface/extended_cmd.py", line 1528, in exec_cmd
> stop = Cmd.onecmd_orig(current_interface, line, **opt)
> File "/Users/alessandrodavoli/Library/MG5_aMC_v2_6_4/madgraph/interface/extended_cmd.py", line 1450, in onecmd_orig
> return func(arg, **opt)
> File "/Users/alessandrodavoli/Library/MG5_aMC_v2_6_4/madgraph/interface/madevent_interface.py", line 3421, in do_refine
> x_improve.launch() # create the ajob for the refinment.
> File "/Users/alessandrodavoli/Library/MG5_aMC_v2_6_4/madgraph/madevent/gen_ximprove.py", line 861, in launch
> main_dir=pjoin(self.cmd.me_dir,'SubProcesses')) #main_dir is for gridpack readonly mode
> File "/Users/alessandrodavoli/Library/MG5_aMC_v2_6_4/madgraph/madevent/sum_html.py", line 734, in collect_result
> P_comb.add_results(os.path.basename(G), path, mfactors[G])
> File "/Users/alessandrodavoli/Library/MG5_aMC_v2_6_4/madgraph/madevent/sum_html.py", line 412, in add_results
> oneresult.read_results(filepath)
> File "/Users/alessandrodavoli/Library/MG5_aMC_v2_6_4/madgraph/madevent/sum_html.py", line 306, in read_results
> self.xsec = data[:10]
> ValueError: need more than 5 values to unpack
> Run Options
> -----------
> stdout_level : 20 (user set)
>
> MadEvent Options
> ----------------
> automatic_html_opening : False (user set)
> notification_center : True
> cluster_temp_path : None
> cluster_memory : None (user set)
> cluster_size : 100
> cluster_queue : None (user set)
> nb_core : 8 (user set)
> cluster_time : 8 (user set)
> run_mode : 2
>
> Configuration Options
> ---------------------
> text_editor : nano (user set)
> cluster_local_path : None
> cluster_status_update : (600, 30)
> pythia8_path : None (user set)
> hwpp_path : None (user set)
> pythia-pgs_path : None (user set)
> td_path : None (user set)
> delphes_path : None (user set)
> thepeg_path : None (user set)
> cluster_type : condor
> madanalysis5_path : None (user set)
> cluster_nb_retry : 1
> eps_viewer : None
> web_browser : None
> syscalc_path : None (user set)
> madanalysis_path : None (user set)
> lhapdf : lhapdf-config
> f2py_compiler : None
> hepmc_path : None (user set)
> cluster_retry_wait : 300
> fortran_compiler : None
> auto_update : 7 (user set)
> exrootanalysis_path : None (user set)
> timeout : 60
> cpp_compiler : None
> #************************************************************
> #* MadGraph5_aMC@NLO *
> #* *
> #* * * *
> #* * * * * *
> #* * * * * 5 * * * * *
> #* * * * * *
> #* * * *
> #* *
> #* *
> #* VERSION 2.6.4 2018-11-09 *
> #* *
> #* 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 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~
> import model /Users/alessandrodavoli/Library/MG5_aMC_v2_6_4/models/SO7\
> _SO5xSO2_eff
> generate ~eta ~eta > h h
> output test
> ######################################################################
> ## PARAM_CARD AUTOMATICALY GENERATED BY MG5 ####
> ######################################################################
> ###################################
> ## INFORMATION FOR CKMBLOCK
> ###################################
> BLOCK CKMBLOCK #
> 1 2.277360e-01 # cabi
> ###################################
> ## INFORMATION FOR FRBLOCK
> ###################################
> BLOCK FRBLOCK #
> 1 1.250000e+02 # masshiggs
> 2 3.947840e+01 # c2
> 3 1.000000e+00 # c4
> 4 9.869600e+00 # c5
> 5 1.013210e-01 # c6
> 6 1.000000e+00 # c7
> 7 9.869600e+00 # c8
> 8 0.000000e+00 # c9
> 9 1.225000e-01 # cg1
> 10 1.225000e-01 # cg2
> 11 4.225000e-01 # cg3
> 12 4.225000e-01 # cg4
> 13 2.000000e+00 # yl
> 14 6.290000e+00 # yr
> 15 8.000000e-02 # xi
> 16 5.000000e-02 # beta
> 17 1.545120e+00 # thetat
> 18 5.000000e-01 # thetab
> 19 1.256640e+01 # gstar
> 20 -1.90397e-01 # lambdaeta
> 21 0.0e-01 # geta
> 22 1.000000e+00 # tauv
> 23 1.000000e+00 # chiv
> 24 1.000000e+00 # kv
> 25 2.000000e+02 # mvd
> ###################################
> ## 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 1.720000e+02 # mt
> 11 5.110000e-04 # me
> 13 1.056600e-01 # mmu
> 15 1.777000e+00 # mta
> 23 9.118760e+01 # mz
> 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 7.982436e+01 # w+ : cmath.sqrt(mz__exp__2/2. + cmath.sqrt(mz__exp__4/4. - (aew*cmath.pi*mz__exp__2)/(gf*sqrt__2)))
> 101 7.730163e+03 # ~h0 : cmath.sqrt((gstar__exp__2*vev__exp__2*(-(c2*c2t)/(8.*cmath.pi**2) - ((c2t*c5 + c8)*ct__exp__2*xi)/(4.*cmath.pi**2)))/xi)
> 102 7.730408e+03 # a0 : cmath.sqrt((masshiggs__exp__2*xi)/2. + (gstar__exp__2*vev__exp__2*(-(c2*c2t)/(8.*cmath.pi**2) - (c2t*(c5 + c8)*ct__exp__2*xi)/(4.*cmath.pi**2)))/xi)
> 103 7.729658e+03 # h+ : cmath.sqrt(-masshiggs__exp__2/2. + (gstar__exp__2*vev__exp__2*(-(c2*c2t)/(8.*cmath.pi**2) + ((c5 - c8)*xi*cmath.sin(2*thetat)**2)/(16.*cmath.pi**2)))/xi)
> 104 2.001587e+02 # ~eta : cmath.sqrt((c2*ct__exp__2*gstar__exp__2*vev__exp__2)/(8.*cmath.pi**2*xi) + (masshiggs__exp__2*xi)/2.)
> 105 7.732714e+03 # ~kap : cmath.sqrt((c2*gstar__exp__2*st__exp__2*vev__exp__2)/xi)/(2.*cmath.pi*sqrt__2)
> 240 2.000000e+02 # vd : mvd
> 25 1.250000e+02 # h : masshiggs
> ###################################
> ## INFORMATION FOR SMINPUTS
> ###################################
> BLOCK SMINPUTS #
> 1 1.279000e+02 # aewm1
> 2 1.166370e-05 # gf
> 3 1.184000e-01 # as
> ###################################
> ## 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 1.720000e+02 # ymt
> 11 5.110000e-04 # yme
> 13 1.056600e-01 # ymm
> 15 1.777000e+00 # ymtau
> ###################################
> ## INFORMATION FOR DECAY
> ###################################
> DECAY 6 1.508336e+00 # wt
> DECAY 23 2.495200e+00 # wz
> DECAY 24 2.085000e+00 # ww
> DECAY 25 4.070000e-03 # wh
> DECAY 101 1.000000e+00 # wh0
> DECAY 102 1.000000e+00 # wa0
> DECAY 103 1.000000e+00 # whp
> DECAY 104 1.000000e+00 # weta
> DECAY 105 1.000000e+00 # wkap
> DECAY 240 2.085000e+00 # wvd
> 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 240
> ###################################
> BLOCK QNUMBERS 240 # vd
> 1 0 # 3 times electric charge
> 2 3 # 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 102
> ###################################
> BLOCK QNUMBERS 102 # a0
> 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/antiparticle distinction (0=own anti)
> ###################################
> ## INFORMATION FOR QNUMBERS 103
> ###################################
> BLOCK QNUMBERS 103 # h+
> 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 104
> ###################################
> BLOCK QNUMBERS 104 # ~eta
> 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/antiparticle distinction (0=own anti)
> ###################################
> ## INFORMATION FOR QNUMBERS 105
> ###################################
> BLOCK QNUMBERS 105 # ~kap
> 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/antiparticle distinction (0=own anti)
> ###################################
> ## INFORMATION FOR QNUMBERS 101
> ###################################
> BLOCK QNUMBERS 101 # ~h0
> 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/antiparticle distinction (0=own anti)
>
> #*********************************************************************
> # 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 full_run_card *
> #*********************************************************************
> #
> #*******************
> # Running parameters
> #*******************
> #
> #*********************************************************************
> # Tag name for the run (one word) *
> #*********************************************************************
> tag_1 = run_tag ! name of the run
> #*********************************************************************
> # Number of events and rnd seed *
> # Warning: Do not generate more than 1M events in a single run *
> # If you want to run Pythia, avoid more than 50k events in a run. *
> #*********************************************************************
> 10000 = 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=photon from proton, *
> # 3=photon from electron *
> #*********************************************************************
> 0 = lpp1 ! beam 1 type
> 0 = lpp2 ! beam 2 type
> 207.364 = ebeam1 ! beam 1 total energy in GeV
> 207.364 = ebeam2 ! beam 2 total energy in GeV
> # To see polarised beam options: type "update beam_pol"
> #*********************************************************************
> # PDF CHOICE: this automatically fixes also alpha_s and its evol. *
> #*********************************************************************
> 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)
> 3.0 = lhe_version ! Change the way clustering information pass to shower.
> True = clusinfo ! include clustering tag in output
> average = event_norm ! average/sum. Normalization of the weight in the LHEF
>
> #*********************************************************************
> # Matching parameter (MLM only)
> #*********************************************************************
> 0 = ickkw ! 0 no matching, 1 MLM
> 1.0 = alpsfact ! scale factor for QCD emission vx
> False = chcluster ! cluster only according to channel diag
> 5 = asrwgtflavor ! highest quark flavor for a_s reweight
> False = auto_ptj_mjj ! Automatic setting of ptj and mjj if xqcut >0
> ! (turn off for VBF and single top processes)
> 0.0 = xqcut ! minimum kt jet measure between partons
> #*********************************************************************
> #
> #*********************************************************************
> # handling of the helicities:
> # 0: sum over all helicities
> # 1: importance sampling over helicities
> #*********************************************************************
> 0 = nhel ! using helicities importance sampling or not.
> #*********************************************************************
> # Generation bias, check the wiki page below for more information: *
> # 'cp3.irmp.ucl.ac.be/projects/madgraph/wiki/LOEventGenerationBias' *
> #*********************************************************************
> None = bias_module ! Bias type of bias, [None, ptj_bias, -custom_folder-]
> {} = bias_parameters ! Specifies the parameters of the module.
> #
> #*******************************
> # Parton level cuts definition *
> #*******************************
> #
> #
> #*********************************************************************
> # BW cutoff (M+/-bwcutoff*Gamma) ! Define on/off-shell for "$" and decay
> #*********************************************************************
> 15.0 = bwcutoff ! (M+/-bwcutoff*Gamma)
> #*********************************************************************
> # Apply pt/E/eta/dr/mij/kt_durham cuts on decay products or not
> # (note that etmiss/ptll/ptheavy/ht/sorted cuts always apply)
> #*********************************************************************
> False = cut_decays ! Cut decay products
> #*********************************************************************
> # Standard Cuts *
> #*********************************************************************
> # Minimum and maximum pt's (for max, -1 means no cut) *
> #*********************************************************************
> 20.0 = ptj ! minimum pt for the jets
> 0.0 = ptb ! minimum pt for the b
> 10.0 = pta ! minimum pt for the photons
> 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 = ptbmax ! maximum pt for the b
> -1.0 = ptamax ! maximum pt for the photons
> -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})
> #*********************************************************************
> # Minimum and maximum E's (in the center of mass frame) *
> #*********************************************************************
> 0.0 = ej ! minimum E for the jets
> 0.0 = eb ! minimum E for the b
> 0.0 = ea ! minimum E for the photons
> 0.0 = el ! minimum E for the charged leptons
> -1.0 = ejmax ! maximum E for the jets
> -1.0 = ebmax ! maximum E for the b
> -1.0 = eamax ! maximum E for the photons
> -1.0 = elmax ! maximum E for the charged leptons
> {} = e_min_pdg ! E cut for other particles (use pdg code). Applied on particle and anti-particle
> {} = e_max_pdg ! E cut for other particles (syntax e.g. {6: 100, 25: 50})
> #*********************************************************************
> # Maximum and minimum absolute rapidity (for max, -1 means no cut) *
> #*********************************************************************
> 5.0 = etaj ! max rap for the jets
> -1.0 = etab ! max rap for the b
> 2.5 = etaa ! max rap for the photons
> 2.5 = etal ! max rap for the charged leptons
> 0.0 = etajmin ! min rap for the jets
> 0.0 = etabmin ! min rap for the b
> 0.0 = etaamin ! min rap for the photons
> 0.0 = etalmin ! main 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 *
> #*********************************************************************
> 0.4 = drjj ! min distance between jets
> 0.0 = drbb ! min distance between b's
> 0.4 = drll ! min distance between leptons
> 0.4 = draa ! min distance between gammas
> 0.0 = drbj ! min distance between b and jet
> 0.4 = draj ! min distance between gamma and jet
> 0.4 = drjl ! min distance between jet and lepton
> 0.0 = drab ! min distance between gamma and b
> 0.0 = drbl ! min distance between b and lepton
> 0.4 = dral ! min distance between gamma and lepton
> -1.0 = drjjmax ! max distance between jets
> -1.0 = drbbmax ! max distance between b's
> -1.0 = drllmax ! max distance between leptons
> -1.0 = draamax ! max distance between gammas
> -1.0 = drbjmax ! max distance between b and jet
> -1.0 = drajmax ! max distance between gamma and jet
> -1.0 = drjlmax ! max distance between jet and lepton
> -1.0 = drabmax ! max distance between gamma and b
> -1.0 = drblmax ! max distance between b and lepton
> -1.0 = dralmax ! maxdistance between gamma and lepton
> #*********************************************************************
> # Minimum and maximum invariant mass for pairs *
> # WARNING: for four lepton final state mmll cut require to have *
> # different lepton masses for each flavor! *
> #*********************************************************************
> 0.0 = mmjj ! min invariant mass of a jet pair
> 0.0 = mmbb ! min invariant mass of a b pair
> 0.0 = mmaa ! min invariant mass of gamma gamma pair
> 0.0 = mmll ! min invariant mass of l+l- (same flavour) lepton pair
> -1.0 = mmjjmax ! max invariant mass of a jet pair
> -1.0 = mmbbmax ! max invariant mass of a b pair
> -1.0 = mmaamax ! max invariant mass of gamma gamma pair
> -1.0 = mmllmax ! max invariant mass of l+l- (same flavour) lepton 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 *
> #*********************************************************************
> 0.0 = ptllmin ! Minimum pt for 4-momenta sum of leptons(l and vl)
> -1.0 = ptllmax ! Maximum pt for 4-momenta sum of leptons(l and vl)
> #*********************************************************************
> # Inclusive cuts *
> #*********************************************************************
> 0.0 = ptheavy ! minimum pt for at least one heavy final state
> 0.0 = xptj ! minimum pt for at least one jet
> 0.0 = xptb ! minimum pt for at least one b
> 0.0 = xpta ! minimum pt for at least one photon
> 0.0 = xptl ! minimum pt for at least one charged lepton
> #*********************************************************************
> # 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
> 0.0 = ptj3min ! minimum pt for the third jet in pt
> 0.0 = ptj4min ! minimum pt for the fourth 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
> -1.0 = ptj3max ! maximum pt for the third jet in pt
> -1.0 = ptj4max ! maximum pt for the fourth jet in pt
> 0 = cutuse ! reject event if fails any (0) / all (1) jet pt cuts
> #*********************************************************************
> # Control the pt's of leptons sorted by pt *
> #*********************************************************************
> 0.0 = ptl1min ! minimum pt for the leading lepton in pt
> 0.0 = ptl2min ! minimum pt for the second lepton in pt
> 0.0 = ptl3min ! minimum pt for the third lepton in pt
> 0.0 = ptl4min ! minimum pt for the fourth lepton in pt
> -1.0 = ptl1max ! maximum pt for the leading lepton in pt
> -1.0 = ptl2max ! maximum pt for the second lepton in pt
> -1.0 = ptl3max ! maximum pt for the third lepton in pt
> -1.0 = ptl4max ! maximum pt for the fourth lepton in pt
> #*********************************************************************
> # 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)
> 0.0 = ht2min ! minimum Ht for the two leading jets
> 0.0 = ht3min ! minimum Ht for the three leading jets
> 0.0 = ht4min ! minimum Ht for the four leading jets
> -1.0 = ht2max ! maximum Ht for the two leading jets
> -1.0 = ht3max ! maximum Ht for the three leading jets
> -1.0 = ht4max ! maximum Ht for the four leading jets
> #***********************************************************************
> # Photon-isolation cuts, according to hep-ph/9801442 *
> # When ptgmin=0, all the other parameters are ignored *
> # When ptgmin>0, pta and draj are not going to be used *
> #***********************************************************************
> 0.0 = ptgmin ! Min photon transverse momentum
> 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)
> #*********************************************************************
> # 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
> #***********************************************************************
> # Turn on either the ktdurham or ptlund cut to activate *
> # CKKW(L) merging with Pythia8 [arXiv:1410.3012, arXiv:1109.4829] *
> #***********************************************************************
> -1.0 = ktdurham
> 0.4 = dparameter
> -1.0 = ptlund
> 1, 2, 3, 4, 5, 6, 21 = pdgs_for_merging_cut ! PDGs for two cuts above
> #*********************************************************************
> # maximal pdg code for quark to be considered as a light jet *
> # (otherwise b cuts are applied) *
> #*********************************************************************
> 4 = maxjetflavor ! Maximum jet pdg code
> #*********************************************************************
> #
> #*********************************************************************
> # Store info for systematics studies *
> # WARNING: Do not use for interference type of computation *
> #*********************************************************************
> False = 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
> # Syscalc is deprecated but to see the associate options type'update syscalc'
>
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Hi Olivier,

1) yes, it displays also the four-points interaction.
2) so, this could explain why setting the "cubic" couplings to 0 gives me an error. However, if I understand correctly, when they are very small but different from zero, the quartic vertex should give the dominant contribution.

 Let me know if sending the UFO to you by email can be useful.

Thanks,

Alessandro

Hi,

One solution when you face the issue with point 2 is to use a restrict_model:
See https://answers.launchpad.net/mg5amcnlo/+faq/2312
This allows to quickly create a model without such three point vertex such that madgraph does not face that issue (and this also fasten your computation. by avoiding to compute zero contribution)

 However, if I understand correctly, when they are very small but different from zero, the quartic vertex should give the dominant contribution.

Yes that's correct.

Cheers,

Olivier

On 22 Jan 2019, at 21:13, Alessandro Davoli <<email address hidden><mailto:<email address hidden>>> wrote:

Question #677995 on MadGraph5_aMC@NLO changed:
https://answers.launchpad.net/mg5amcnlo/+question/677995

   Status: Answered => Open

Alessandro Davoli is still having a problem:
Hi Olivier,

1) yes, it displays also the four-points interaction.
2) so, this could explain why setting the "cubic" couplings to 0 gives me an error. However, if I understand correctly, when they are very small but different from zero, the quartic vertex should give the dominant contribution.

Let me know if sending the UFO to you by email can be useful.

Thanks,

Alessandro

--
You received this question notification because you are an answer
contact for MadGraph5_aMC@NLO.

Hi Olivier,

the problem is that if i set the cubic interactions very small, the whole cross section is vanishingly small, as if the quartic interaction was simply completely ignored. So, I am not sured your suggestion of restriction really helps.

Cheers,
Alessandro

At least with that restriction you would be computing ONLY the quartic contribution and
this can be a nice test to see in that case if you still have that very small contribution.
and be able to get that contribution in a clean way.

Cheers,

Olivier

> On 22 Jan 2019, at 21:57, Alessandro Davoli <email address hidden> wrote:
>
> Question #677995 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/677995
>
> Alessandro Davoli posted a new comment:
> Hi Olivier,
>
> the problem is that if i set the cubic interactions very small, the
> whole cross section is vanishingly small, as if the quartic interaction
> was simply completely ignored. So, I am not sured your suggestion of
> restriction really helps.
>
> Cheers,
> Alessandro
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Hi Olivier,

I tried with the restriction, but this didn't solve the problem.
If I set the cubic coupling to zero, it correctly shows the quartic diagram only. But when I launch it, I get the same error

Ok,

So does it says which results.dat is not correctly formatted?
if so in the same directory it should have a log file.
can you copy-paste the last 50 lines of that files?

One know bug of that version is the support of some colored particle in the default dynamical choice.
Maybe something to test as well.

Cheers,

Olivier

> On 23 Jan 2019, at 08:52, Alessandro Davoli <email address hidden> wrote:
>
> Question #677995 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/677995
>
> Alessandro Davoli posted a new comment:
> Hi Olivier,
>
> I tried with the restriction, but this didn't solve the problem.
> If I set the cubic coupling to zero, it correctly shows the quartic diagram only. But when I launch it, I get the same error
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Hi Olivier,

it says

Error when reading /Users/alessandrodavoli/Library/MG5_aMC_v2_6_4/bin/test/SubProcesses/P1_xetaxeta_hh/G1/results.dat,

 but that file only contains the line "end code not correct 3".

In the past, I had problems with dynamical scale (https://answers.launchpad.net/mg5amcnlo/+question/676416), but in this case it does not fix the problem.

Cheers
Alessandro

could you try with this tarball:
https://bazaar.launchpad.net/~maddevelopers/mg5amcnlo/2.6.5_bug_mlm/tarball/299

If this does not work, could you send me your UFO model by email?

Cheers,

Olivier

On 23 Jan 2019, at 09:49, Alessandro Davoli <<email address hidden><mailto:<email address hidden>>> wrote:

Question #677995 on MadGraph5_aMC@NLO changed:
https://answers.launchpad.net/mg5amcnlo/+question/677995

Alessandro Davoli posted a new comment:
Hi Olivier,

it says

Error when reading
/Users/alessandrodavoli/Library/MG5_aMC_v2_6_4/bin/test/SubProcesses/P1_xetaxeta_hh/G1/results.dat,

but that file only contains the line "end code not correct 3".

In the past, I had problems with dynamical scale
(https://answers.launchpad.net/mg5amcnlo/+question/676416), but in this
case it does not fix the problem.

Cheers
Alessandro

--
You received this question notification because you are an answer
contact for MadGraph5_aMC@NLO.

Hi,

Thanks for the model.
I'm fully checking this for the moment, but as a quick patch the following should work:

=== modified file 'Template/LO/SubProcesses/reweight.f'
--- Template/LO/SubProcesses/reweight.f 2019-01-23 09:00:02 +0000
+++ Template/LO/SubProcesses/reweight.f 2019-01-23 13:43:44 +0000
@@ -399,7 +399,7 @@
 c exotic q > gluon q'
         ipart(1,imo)=ipart(1,ida1)
         ipart(2,imo)=0
- else if (get_color(idmo).eq.1) then
+ else if (get_color(idmo).eq.1.or.get_color(idmo).eq.2) then
 c Color singlet
          ipart(1,imo)=ipart(1,ida1)
          ipart(2,imo)=ipart(1,ida2)

Cheers,

Olivier

Hi Olivier,

should I close the ticket or should I wait for another solution from you?

Cheers
Alessandro

Thanks Olivier Mattelaer, that solved my question.