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Herwig  7.2.1
Interfaces defined for the Herwig::MEPP2VVPowheg class.
Brief class description:
The MEPP2VVPowheg class implements the NLO matrix elements for the production ofpairs of electroweak vector bosons.
See also Herwig::MEPP2VVPowheg

Name: minPt
Type: Parameter

Description:
The pT cut on hardest emision generation2*(1-Beta)*exp(-sqr(intrinsicpT/RMS))/sqr(RMS)
Default value: 2
Minimum value: 0
Maximum value: 100000

Name: Prefactorgqbar
Type: Parameter

Description:
The prefactor for the sampling of the g qbar channel
Default value: 3
Minimum value: 0
Maximum value: 1000

Name: Prefactorqg
Type: Parameter

Description:
The prefactor for the sampling of the q g channel
Default value: 3
Minimum value: 0
Maximum value: 1000

Name: Prefactorqqbar
Type: Parameter

Description:
The prefactor for the sampling of the q qbar channel
Default value: 5
Minimum value: 0
Maximum value: 1000

Name: Power
Type: Parameter

Description:
The power for the sampling of the matrix elements
Default value: 2
Minimum value: 1
Maximum value: 10

Name: Coupling
Type: Reference to objects of class Herwig::ShowerAlpha

Description:
The object calculating the strong coupling constant

Name: SpinCorrelations
Type: Switch

Description:
Flag to select leading order spin correlations or a calculation taking into account the real NLO effects
Registered options:
0(LeadingOrder)
Decay bosons using a leading order 2->2 calculation of the production spin density matrix
1(RealNLO)
Decay bosons using a production spin density matrix which takes into account the effects of real radiation
Default value: 1

Name: RenormalizationScaleValue
Type: Parameter

Description:
Value to use for the EW and QCD renormalization scales if fixed scales have been requested with the ScaleOption interface.
Default value: 100
Minimum value: 50
Maximum value: 500

Name: FactorizationScaleValue
Type: Parameter

Description:
Value to use for the QCD factorization scale if fixed scaleshave been requested with the ScaleOption interface.
Default value: 100
Minimum value: 50
Maximum value: 500

Name: ScaleOption
Type: Switch

Description:
Option for running / fixing EW and QCD factorization & renormalization scales
Registered options:
1(Dynamic)
QCD factorization & renormalization scales are sqr(pV1+pV2). EW scale is (mV1^2+mV2^2)/2 (similar to MCatNLO)
2(Fixed)
QCD factorization fixed to value by FactorizationScaleValue.EW and QCD renormalization scales fixed by RenormalizationScaleValue.
Default value: 1

Name: removebr
Type: Switch

Description:
Whether to multiply the event weights by the MCFM branching ratios
Registered options:
0(No)
Multiply by MCFM branching ratios for comparison/debugging purposes
1(Yes)
Do not multiply in the branching ratios (default running)
Default value: 1

Name: FixedNLOalphaS
Type: Parameter

Description:
The value of alphaS to use for the nlo weight if nlo_alphaS_opt_=1
Default value: 0.118035
Minimum value: 0
Maximum value: 1

Name: NLOalphaSopt
Type: Switch

Description:
An option allowing you to supply a fixed value of alpha_S through the FixedNLOAlphaS interface.
Registered options:
0(RunningAlphaS)
Use the usual running QCD coupling evaluated at scale mu_UV2()
1(FixedAlphaS)
Use a constant QCD coupling for comparison/debugging purposes
Default value: 0

Name: Channels
Type: Switch

Description:
Which channels to include in the cross section
Registered options:
0(All)
All channels required for the full NLO cross section: qqb, qg, gqb
1(Annihilation)
Only include the qqb annihilation channel, omitting qg and gqb channels
2(Compton)
Only include the qg and gqb compton channels, omitting all qqb processes
Default value: 0

Name: Contribution
Type: Switch

Description:
Which contributions to the cross section to include
Registered options:
0(LeadingOrder)
Just generate the leading order cross section
1(PositiveNLO)
Generate the positive contribution to the full NLO cross section
2(NegativeNLO)
Generate the negative contribution to the full NLO cross section
Default value: 1

There may be interfaces inherited from the Herwig::MEPP2VV class.