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0001 EV1_nFinal (D=-1) Number of outgoing particles of POWHEG Born level process
0002 (i.e. not counting additional POWHEG radiation)
0003 If negative, the program tried to find it out automatically.
0004 Note that the automatic finding will not work for QCD processes
0005 without top quarks
0006
0007 EV1_vetoOn (D=true) This is needed if one needs to veto only on MPI (see below)
0008
0009 EV1_maxVetoCount (D=10) After 'maxVetoCount' accepted emissions in a row, no more emissions
0010 are checked.
0011
0012 EV1_pThardMode (D=1) Selection of pThard (note, for events where there is no
0013 radiation, pThard is always set to be Q_fac):
0014 0 - pThard = Q_fac
0015 1 - the pT of the POWHEG emission is tested against all other
0016 incoming and outgoing partons, with the minimal value chosen
0017 2 - the pT of all final-state partons is tested against all other
0018 incoming and outgoing partons, with the minimal value chosen
0019
0020 EV1_pTempMode (D=0) Selection of pTemp:
0021 0 - pTemp is pT of the emitted parton w.r.t. radiating parton
0022 1 - pT of the emission is checked against all incoming and outgoing
0023 partons. pTemp is set to the minimum of these values
0024 2 - the pT of all final-state partons is tested against all other
0025 incoming and outgoing partons, with the minimal value chosen
0026
0027 EV1_emittedMode (D=0) Selection of emitted parton for FSR
0028 0 - Pythia definition of emitted
0029 1 - Pythia definition of radiator
0030 2 - Random selection of emitted or radiator
0031 3 - Both emitted and radiator are tried
0032
0033 EV1_pTdefMode (D=1) pT definitions
0034 0 - POWHEG ISR pT definition is used for both ISR and FSR
0035 1 - POWHEG ISR pT and FSR d_ij definitions
0036 2 - Pythia definitions
0037
0038 EV1_MPIvetoOn (D=false) MPI vetoing
0039 false - No MPI vetoing is done
0040 true - When there is no radiation, MPIs with a scale above pT_1 are
0041 vetoed, else MPIs with a scale above (pT_1 + pT_2 + pT_3) / 2
0042 are vetoed
0043 Attention! If true add 'MultipartonInteractions:pTmaxMatch = 2' to pythia
0044 parameters.
0045
0046 EV1_QEDvetoMode (D=0) Treatment of non-QCD radiation.
0047 0 - Colorless partons are not included in pT calculated from the shower for pTemt>0 .
0048 1 - Colorless partons are included for pTemt>0.
0049 2 - Colorless partons are included for pTemt>0. Additionally, if a colorless parton is emitted with pT > pThard in Born-level events, then the entire event is accepted. This is relevant for all values of pTemt .
0050
0051 EV1_nFinalMode (D=0) Specification of nfinal.
0052 0 - nfinal needs to be specified and is cross-checked against the final state particle content in the event to estimate whether we are dealing with radiation or not.
0053 1 - nfinal doesn't need to be specified (same as neg. value of nfinal) but will be estimated. Result will be cross checked as in mode 0.
0054 2 - nfinal is not specified, the Powheg emission will be estimated by looking for particles that are a light quark(5F)/gluon that comes from a light quark/gluon (not resonance, nor top)
0055 3 - same is nfinalmode = 0, except that the nFinal check now accepts nFinal - 1 in addition to nFinal and nFinal + 1 particles (this is useful for POWHEG WGamma generation, in which there are some W-only born events); should be used with ptHardMode = 0, since the emission variables in doVetoMPIStep are not set correctly when there are three possible particle Born particle counts
