Wrong threshold for ve photon > e- w+

Hi,

You have the following line in your run_card:
10 = ptl ! minimum pt for the charged leptons

Therefore the threshold is 10GeV higher.

Cheers,

Olivier
On Nov 24, 2013, at 1:11 AM, Heng-Yu Chen <email address hidden> wrote:

> New question #239718 on MadGraph5:
> https://answers.launchpad.net/madgraph5/+question/239718
>
> Dear Sir:
> I use the website to generate the code for ve photon > e- w+.
> Apparently the threshold should be about 82 GeV.
> But the threshold I get is about 92GeV. And it is physically wrong.
> I do turn off the PDF and adjust the polarization of ve to -100.
> I also use ve vm > ve vm as an exercise to test the code and it is consistent with my hand derived result.
> I am confused and can't figure out why.
> Could you give some suggestions for the possible errors?
> The following is my run cards dat.
> I really appreciate your help. Thanks!
>
> 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. *
> #*********************************************************************
> 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
> 45.59 = ebeam1 ! beam 1 total energy in GeV
> 45.59 = ebeam2 ! beam 2 total energy in GeV
> #*********************************************************************
> # Beam polarization from -100 (left-handed) to 100 (right-handed) *
> #*********************************************************************
> -100 = 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 *
> #*********************************************************************
> T = 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
> 5 = asrwgtflavor ! highest quark flavor for a_s reweight
> #*********************************************************************
> # 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 (for max, -1 means no cut) *
> #*********************************************************************
> 20 = ptj ! minimum pt for the jets
> 0 = ptb ! minimum pt for the b
> 10 = pta ! minimum pt for the photons
> 10 = 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
> -1 = ptjmax ! maximum pt for the jets
> -1 = ptbmax ! maximum pt for the b
> -1 = ptamax ! maximum pt for the photons
> -1 = ptlmax ! maximum pt for the charged leptons
> -1 = 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
> -1 = ejmax ! maximum E for the jets
> -1 = ebmax ! maximum E for the b
> -1 = eamax ! maximum E for the photons
> -1 = elmax ! maximum E for the charged leptons
> #*********************************************************************
> # Maximum and minimum absolute rapidity (for max, -1 means no cut) *
> #*********************************************************************
> 5 = etaj ! max rap for the jets
> -1 = etab ! max rap for the b
> 2.5 = etaa ! max rap for the photons
> 2.5 = etal ! max rap for the charged leptons
> 0.6 = etaonium ! max rap for the quarkonium states
> 0 = etajmin ! min rap for the jets
> 0 = etabmin ! min rap for the b
> 0 = etaamin ! min rap for the photons
> 0 = etalmin ! main rap for the charged leptons
> #*********************************************************************
> # Minimum and maximum DeltaR distance *
> #*********************************************************************
> 0.4 = drjj ! min distance between jets
> 0 = drbb ! min distance between b's
> 0.4 = drll ! min distance between leptons
> 0.4 = draa ! min distance between gammas
> 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 = drab ! min distance between gamma and b
> 0 = drbl ! min distance between b and lepton
> 0.4 = dral ! min distance between gamma and lepton
> -1 = drjjmax ! max distance between jets
> -1 = drbbmax ! max distance between b's
> -1 = drllmax ! max distance between leptons
> -1 = draamax ! max distance between gammas
> -1 = drbjmax ! max distance between b and jet
> -1 = drajmax ! max distance between gamma and jet
> -1 = drjlmax ! max distance between jet and lepton
> -1 = drabmax ! max distance between gamma and b
> -1 = drblmax ! max distance between b and lepton
> -1 = 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
> -1 = mmjjmax ! max invariant mass of a jet pair
> -1 = mmbbmax ! max invariant mass of a b pair
> -1 = mmaamax ! max invariant mass of gamma gamma pair
> -1 = 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)
> -1 = 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)
> -1 = 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
> -1 = ptj1max ! maximum pt for the leading jet in pt
> -1 = ptj2max ! maximum pt for the second jet in pt
> -1 = ptj3max ! maximum pt for the third jet in pt
> -1 = 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
> -1 = ptl1max ! maximum pt for the leading lepton in pt
> -1 = ptl2max ! maximum pt for the second lepton in pt
> -1 = ptl3max ! maximum pt for the third lepton in pt
> -1 = 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)
> -1 = htjmax ! maximum jet HT=Sum(jet pt)
> 0 = ihtmin !inclusive Ht for all partons (including b)
> -1 = 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
> -1 = ht2max ! maximum Ht for the two leading jets
> -1 = ht3max ! maximum Ht for the three leading jets
> -1 = 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
> #*********************************************************************
>
>
>
>
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Hi, Olivier!
The problem is solved!
I really appreciate your help.

Best!