Hi, I'm trying to generate stop production and dileptonic decay directly in MG5 (banner card appended below), but the actual process generated only goes down to the ws, and doesn't decay the ws leptonically like I want. I don't think I'm running into the limit on the number of particles in the final state, but is there some limit to the number of steps you can ask for in a decay chain? Cheers, Rakhi

# MG version : 5.1.4.6 # model version : usrmod_1.0.5 #************************************************************ #* MadGraph 5 * #* * #* * * * #* * * * * * #* * * * * 5 * * * * * #* * * * * * #* * * * #* * #* * #* VERSION 1.4.6 2012-05-16 * #* * #* The MadGraph Development Team - Please visit us at * #* https://server06.fynu.ucl.ac.be/projects/madgraph * #* * #************************************************************ #* * #* Command File for MadGraph 5 * #* * #* run as ./bin/mg5 filename * #* * #************************************************************ import model sm import model_v4 stop generate p p > t1 t1~, (t1 > t n1, t > w+ b, w+ > e+ ve), (t1~ > t~ n1, t~ > w- b~, w- > e- ve~) output ststbdilepton #********************************************************************* # MadGraph/MadEvent * # http://madgraph.hep.uiuc.edu * # * # proc_card.dat * #********************************************************************* # * # This Files is generated by MADGRAPH 5 * # * # WARNING: This Files is generated for MADEVENT (compatibility issue)* # This files is NOT a valid MG4 proc_card.dat * # Running this in MG4 will NEVER reproduce the result of MG5* # * #********************************************************************* #********************************************************************* # Process(es) requested : mg2 input * #********************************************************************* # Begin PROCESS # This is TAG. Do not modify this line p p > t1 t1~ , (t1 > t n1 , t > w+ b , w+ > e+ ve) , (t1~ > t~ n1 , t~ > w- b~ , w- > e- ve~) #Process # Be carefull the coupling are here in MG5 convention end_coup # End the couplings input done # this tells MG there are no more procs # End PROCESS # This is TAG. Do not modify this line #********************************************************************* # Model information * #********************************************************************* # Begin MODEL # This is TAG. Do not modify this line stop # End MODEL # This is TAG. Do not modify this line #********************************************************************* # Start multiparticle definitions * #********************************************************************* # Begin MULTIPARTICLES # This is TAG. Do not modify this line # End MULTIPARTICLES # This is TAG. Do not modify this line #********************************************************************* # MadGraph/MadEvent * # http://madgraph.hep.uiuc.edu * # * # param_card.dat * # * # Les Houches friendly file for the SM parameters of MadGraph * # Spectrum and decay widths produced by SMCalc * # * # Please note the following IMPORTANT issues: * # * # 0. REFRAIN from editing this file by hand! Some of the parame- * # ters are not independent * # (such as G_Fermi, alpha_em, sin(theta_W),MZ,MW) and serious * # problems might be encountered (such as violation of unitarity * # or gauge invariance). Always use a calculator. * # * # 1. alpha_S(MZ) has been used in the calculation of the parameters * # but, for consistency, it will be reset by madgraph to the * # value expected IF the pdfs for collisions with hadrons are * # used. This value is KEPT by madgraph when no pdf are used * # lpp(i)=0 . * # * # 2. Values of the charm and bottom kinematic (pole) masses are * # those used in the matrix elements and phase space UNLESS they * # are set to ZERO from the start in the model (particles.dat) * # This happens, for example, when using 5-flavor QCD where * # charm and bottom are treated as partons in the initial state * # and a zero mass might be hardwired in the model definition. * # * ##******************************************************************** Block MODSEL # Select Model 0 1 # 0 1 = SM Block SMINPUTS # Standard Model inputs 1 1.27900000E+02 # alpha_em(MZ)(-1) SM MSbar 2 1.16600000E-05 # G_Fermi 3 1.18000000E-01 # alpha_s(MZ) SM MSbar 4 9.15445065E+01 # Z mass (as input parameter) Block MGYUKAWA # Yukawa masses m/v=y/sqrt(2) # PDG YMASS 5 4.20000000E+00 # mbottom for the Yukawa y_b 4 1.25000000E+00 # mcharm for the Yukawa y_c 6 1.74300000E+02 # mtop for the Yukawa y_t 15 1.77700000E+00 # mtau for the Yukawa y_ta Block MGCKM # CKM elements for MadGraph 1 1 9.75000000E-01 # Vud for Cabibbo matrix #=========================================================== # QUANTUM NUMBERS OF NEW STATE(S) (NON SM PDG CODE) IF ANY # (see below for masses and decay tables) # These blocks are automatically created by the MadGraph # qnumbers.pl script from the particles.dat model file #=========================================================== # END of QNUMBERS blocks #=========================================================== Block MASS # Mass spectrum (kinematic masses) # PDG Mass 4 1.40000000E+00 # charm pole mass 5 4.20000000E+00 # bottom pole mass 6 1.73500000E+02 # top pole mass 15 1.77700000E+00 # tau mass 23 9.15445065E+01 # Z mass 24 8.02673592E+01 # W mass 25 1.20000000E+02 # H mass 1000006 4.00000000e+02 # MT1 1000022 2.00000000e+02 # MN1 # PDG Width DECAY 1000006 4.87257483e-01 # t1 decays # BR NDA ID1 ID2 1.00000000e+00 2 1000022 6 # BR(t1 -> n1 t ) # DECAY -1000006 4.87792385e-01 # t1~ decays # BR NDA ID1 ID2 1.00000000e+00 2 -6 1000022 # BR(t1~ -> t~ n1 ) # DECAY 6 1.50530838e+00 # t decays # BR NDA ID1 ID2 1.00000000e+00 2 5 24 # BR(t -> b w+ ) # DECAY -6 1.50213703e+00 # t~ decays # BR NDA ID1 ID2 1.00000000e+00 2 -5 -24 # BR(t~ -> b~ w- ) # DECAY 24 2.03211963e+00 # w+ decays # BR NDA ID1 ID2 3.31965773e-01 2 2 -1 # BR(w+ -> u d~ ) 3.34295852e-01 2 4 -3 # BR(w+ -> c s~ ) 1.11419809e-01 2 12 -11 # BR(w+ -> ve e+ ) 1.10905350e-01 2 14 -13 # BR(w+ -> vm mu+ ) 1.11413216e-01 2 16 -15 # BR(w+ -> vt ta+ ) # DECAY -24 2.04265247e+00 # w- decays # BR NDA ID1 ID2 3.34080231e-01 2 1 -2 # BR(w- -> d u~ ) 3.34794486e-01 2 3 -4 # BR(w- -> s c~ ) 1.09609664e-01 2 11 -12 # BR(w- -> e- ve~ ) 1.10449835e-01 2 13 -14 # BR(w- -> mu- vm~ ) 1.11065784e-01 2 15 -16 # BR(w- -> ta- vt~ ) # DECAY 1000022 1.00000000e+00 # WN1 DECAY 23 2.44639985E+00 # Z width DECAY 25 6.79485838E-03 # H width BLOCK MGUSER 1 0.00000000e+00 # a_cp ,first variable name 2 0.00000000e+00 # b_cp ,second variable name 3 0.00000000e+00 # c_cp ,second variable name #********************************************************************* # MadGraph/MadEvent * # http://madgraph.hep.uiuc.edu * # * # run_card.dat * # * # 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 * #********************************************************************* # #******************* # Running parameters #******************* # #********************************************************************* # Tag name for the run (one word) * #********************************************************************* tag_1 = run_tag ! name of the run #********************************************************************* # Run to generate the grid pack * #********************************************************************* .false. = gridpack !True = setting up the grid pack #********************************************************************* # 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. * #********************************************************************* 20000 = nevents ! Number of unweighted events requested 31 = iseed ! rnd seed (0=assigned automatically=default)) #********************************************************************* # Collider type and energy * #********************************************************************* 1 = lpp1 ! beam 1 type (0=NO PDF) 1 = lpp2 ! beam 2 type (0=NO PDF) 4000 = ebeam1 ! beam 1 energy in GeV 4000 = ebeam2 ! beam 2 energy in GeV #********************************************************************* # Beam polarization from -100 (left-handed) to 100 (right-handed) * #********************************************************************* 0 = polbeam1 ! beam polarization for beam 1 0 = polbeam2 ! beam polarization for beam 2 #********************************************************************* # PDF CHOICE: this automatically fixes also alpha_s and its evol. * #********************************************************************* 'cteq6l1' = pdlabel ! PDF set #********************************************************************* # Renormalization and factorization scales * #********************************************************************* F = fixed_ren_scale ! if .true. use fixed ren scale F = fixed_fac_scale ! if .true. use fixed fac scale 91.1880 = scale ! fixed ren scale 91.1880 = dsqrt_q2fact1 ! fixed fact scale for pdf1 91.1880 = dsqrt_q2fact2 ! fixed fact scale for pdf2 1 = scalefact ! scale factor for event-by-event scales #********************************************************************* # Matching - Warning! ickkw > 1 is still beta #********************************************************************* 0 = ickkw ! 0 no matching, 1 MLM, 2 CKKW matching 1 = highestmult ! for ickkw=2, highest mult group 1 = ktscheme ! for ickkw=1, 1 Durham kT, 2 Pythia pTE 1 = alpsfact ! scale factor for QCD emission vx F = chcluster ! cluster only according to channel diag T = pdfwgt ! for ickkw=1, perform pdf reweighting #********************************************************************* # Automatic ptj and mjj cuts if xqcut > 0 # (turn off for VBF and single top processes) #********************************************************** T = auto_ptj_mjj ! Automatic setting of ptj and mjj #********************************************************** # #********************************** # BW cutoff (M+/-bwcutoff*Gamma) #********************************** 15 = bwcutoff ! (M+/-bwcutoff*Gamma) #********************************************************** # Apply pt/E/eta/dr/mij cuts on decay products or not # (note that etmiss/ptll/ptheavy/ht/sorted cuts always apply) #********************************************************** T = cut_decays ! Cut decay products #************************************************************* # Number of helicities to sum per event (0 = all helicities) # 0 gives more stable result, but longer run time (needed for # long decay chains e.g.). # Use >=2 if most helicities contribute, e.g. pure QCD. #************************************************************* 0 = nhel ! Number of helicities used per event #******************* # Standard Cuts #******************* # #********************************************************************* # Minimum and maximum pt's * #********************************************************************* 0 = ptj ! minimum pt for the jets 0 = ptb ! minimum pt for the b 0 = pta ! minimum pt for the photons 0 = ptl ! minimum pt for the charged leptons 0 = misset ! minimum missing Et (sum of neutrino's momenta) 0 = ptheavy ! minimum pt for one heavy final state 1.0 = ptonium ! minimum pt for the quarkonium states 1d5 = ptjmax ! maximum pt for the jets 1d5 = ptbmax ! maximum pt for the b 1d5 = ptamax ! maximum pt for the photons 1d5 = ptlmax ! maximum pt for the charged leptons 1d5 = missetmax ! maximum missing Et (sum of neutrino's momenta) #********************************************************************* # Minimum and maximum E's (in the lab frame) * #********************************************************************* 0 = ej ! minimum E for the jets 0 = eb ! minimum E for the b 0 = ea ! minimum E for the photons 0 = el ! minimum E for the charged leptons 1d5 = ejmax ! maximum E for the jets 1d5 = ebmax ! maximum E for the b 1d5 = eamax ! maximum E for the photons 1d5 = elmax ! maximum E for the charged leptons #********************************************************************* # Maximum and minimum rapidity * #********************************************************************* 1d2 = etaj ! max rap for the jets 1d2 = etab ! max rap for the b 1d2 = etaa ! max rap for the photons 1d2 = etal ! max rap for the charged leptons 1d2 = etaonium ! max rap for the quarkonium states 0d0 = etajmin ! min rap for the jets 0d0 = etabmin ! min rap for the b 0d0 = etaamin ! min rap for the photons 0d0 = etalmin ! main rap for the charged leptons #********************************************************************* # Minimum and maximum DeltaR distance * #********************************************************************* 0 = drjj ! min distance between jets 0 = drbb ! min distance between b's 0 = drll ! min distance between leptons 0 = draa ! min distance between gammas 0 = drbj ! min distance between b and jet 0 = draj ! min distance between gamma and jet 0 = drjl ! min distance between jet and lepton 0 = drab ! min distance between gamma and b 0 = drbl ! min distance between b and lepton 0 = dral ! min distance between gamma and lepton 1d2 = drjjmax ! max distance between jets 1d2 = drbbmax ! max distance between b's 1d2 = drllmax ! max distance between leptons 1d2 = draamax ! max distance between gammas 1d2 = drbjmax ! max distance between b and jet 1d2 = drajmax ! max distance between gamma and jet 1d2 = drjlmax ! max distance between jet and lepton 1d2 = drabmax ! max distance between gamma and b 1d2 = drblmax ! max distance between b and lepton 1d2 = dralmax ! maxdistance between gamma and lepton #********************************************************************* # Minimum and maximum invariant mass for pairs * #********************************************************************* 0 = mmjj ! min invariant mass of a jet pair 0 = mmbb ! min invariant mass of a b pair 0 = mmaa ! min invariant mass of gamma gamma pair 0 = mmll ! min invariant mass of l+l- (same flavour) lepton pair 1d5 = mmjjmax ! max invariant mass of a jet pair 1d5 = mmbbmax ! max invariant mass of a b pair 1d5 = mmaamax ! max invariant mass of gamma gamma pair 1d5 = mmllmax ! max invariant mass of l+l- (same flavour) lepton pair #********************************************************************* # Minimum and maximum invariant mass for all letpons * #********************************************************************* 0 = mmnl ! min invariant mass for all letpons (l+- and vl) 1d5 = mmnlmax ! max invariant mass for all letpons (l+- and vl) #********************************************************************* # Minimum and maximum pt for 4-momenta sum of leptons * #********************************************************************* 0 = ptllmin ! Minimum pt for 4-momenta sum of leptons(l and vl) 1d5 = ptllmax ! Maximum pt for 4-momenta sum of leptons(l and vl) #********************************************************************* # Inclusive cuts * #********************************************************************* 0 = xptj ! minimum pt for at least one jet 0 = xptb ! minimum pt for at least one b 0 = xpta ! minimum pt for at least one photon 0 = xptl ! minimum pt for at least one charged lepton #********************************************************************* # Control the pt's of the jets sorted by pt * #********************************************************************* 0 = ptj1min ! minimum pt for the leading jet in pt 0 = ptj2min ! minimum pt for the second jet in pt 0 = ptj3min ! minimum pt for the third jet in pt 0 = ptj4min ! minimum pt for the fourth jet in pt 1d5 = ptj1max ! maximum pt for the leading jet in pt 1d5 = ptj2max ! maximum pt for the second jet in pt 1d5 = ptj3max ! maximum pt for the third jet in pt 1d5 = 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 = ptl1min ! minimum pt for the leading lepton in pt 0 = ptl2min ! minimum pt for the second lepton in pt 0 = ptl3min ! minimum pt for the third lepton in pt 0 = ptl4min ! minimum pt for the fourth lepton in pt 1d5 = ptl1max ! maximum pt for the leading lepton in pt 1d5 = ptl2max ! maximum pt for the second lepton in pt 1d5 = ptl3max ! maximum pt for the third lepton in pt 1d5 = ptl4max ! maximum pt for the fourth lepton in pt #********************************************************************* # Control the Ht(k)=Sum of k leading jets * #********************************************************************* 0 = htjmin ! minimum jet HT=Sum(jet pt) 1d5 = htjmax ! maximum jet HT=Sum(jet pt) 0 = ihtmin !inclusive Ht for all partons (including b) 1d5 = ihtmax !inclusive Ht for all partons (including b) 0 = ht2min ! minimum Ht for the two leading jets 0 = ht3min ! minimum Ht for the three leading jets 0 = ht4min ! minimum Ht for the four leading jets 1d5 = ht2max ! maximum Ht for the two leading jets 1d5 = ht3max ! maximum Ht for the three leading jets 1d5 = ht4max ! maximum Ht for the four leading jets #********************************************************************* # WBF cuts * #********************************************************************* 0 = xetamin ! minimum rapidity for two jets in the WBF case 0 = deltaeta ! minimum rapidity for two jets in the WBF case #********************************************************************* # maximal pdg code for quark to be considered as a light jet * # (otherwise b cuts are applied) * #********************************************************************* 4 = maxjetflavor ! Maximum jet pdg code #********************************************************************* # Jet measure cuts * #********************************************************************* 0 = xqcut ! minimum kt jet measure between partons #********************************************************************* # Number of Events : 20000 # Integrated weight (pb) : .38415E+00 # Truncated wgt (pb) : .00000E+00 # Unit wgt : .19207E-04

When	Who	Action	New State
2012-10-04	Johan Alwall	Answer	Answered
2012-10-04	Rakhi Mahbubani	Confirm	Solved
2012-10-04	Rakhi Mahbubani	Confirm	Solved

MadGraph5_aMC@NLO

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