- Brief class description:
- Administers the space-like shower.
See also Pythia7::SpaceShowerHandler
Name: Q2StartFrac
Type: Parameter
- Description:
- Mimimum gap in values to allow iteration when parton density vanishes.
Default value: 0.9
Minimum value: 0
Maximum value: 1
Name: HeavyMax
Type: Parameter
- Description:
- Maximum allowed x when reconstructing back to heavy flavour from gluon or photon.
Default value: 0.5
Minimum value: 0
Maximum value: 1
Name: ExtraPreweight
Type: Parameter
- Description:
- Extra preweight in QED shower evolution, to avoid maximum violation.
Default value: 0.1
Minimum value: 0
Maximum value: 1
Name: HeavyEvol
Type: Parameter
- Description:
- Safety margin in x that heavy flavour evolution is at all possible.
Default value: 0.8
Minimum value: 0
Maximum value: 1
Name: TinyKinPrec
Type: Parameter
- Description:
- Vanishingly small recoil mass in branching kinematics reconstruction.
Default value: 1e-10
Minimum value: 0
Maximum value: 1
Name: TinyKernelPDF
Type: Parameter
- Description:
- Vanishingly small product of splitting kernels and parton density ratios.
Default value: 1e-05
Minimum value: 0
Maximum value: 1
Name: TinyPDF
Type: Parameter
- Description:
- Vanishingly small parton density.
Default value: 1e-10
Minimum value: 0
Maximum value: 1
Name: TinyQChg
Type: Parameter
- Description:
- Smallest particle mass for QED evolution (= electron mass).
Default value: 0.00051
Minimum value: 0
Maximum value: 1
Name: XMinEmittedChg
Type: Parameter
- Description:
- Minimum x fraction of emitted photon - matched to treatment of photon PDF.
Default value: 1e-10
Minimum value: 0
Maximum value: 1
Name: ZMinEmitted
Type: Parameter
- Description:
- Minimum fraction 1 - z of emitted QCD parton, in addition to other limits.
Default value: 0.001
Minimum value: 0
Maximum value: 1
Name: EMinEmitted
Type: Parameter
- Description:
- Minimum energy of emitted QCD parton in rest frame of subprocess.
Default value: 2
Minimum value: 0
Maximum value: 1e+10
Name: AlphaEMFix
Type: Parameter
- Description:
- Fixed value.
Default value: 0.0073
Minimum value: 0
Maximum value: 10
Name: Lambda5
Type: Parameter
- Description:
- (five flavours) in alpha_strong for AlphaSMode >= 1.
Default value: 0.18
Minimum value: 0
Maximum value: 10
Name: AlphaSFix
Type: Parameter
- Description:
- Fixed alpha_strong value for AlphaSMode == 0.
Default value: 0.2
Minimum value: 0
Maximum value: 10
Name: Q0ChgL
Type: Parameter
- Description:
- Parton shower cut-off mass for pure QED branchings. Assumed <= Q0ChgQ.
Default value: 0.001 (May be changed by member function.)
Minimum value: 0
Maximum value: 1e+10
Name: Q0ChgQ
Type: Parameter
- Description:
- Parton shower cut-off mass for photon coupling to coloured particle.
Default value: 1
Minimum value: 0
Maximum value: 1e+10
Name: Q0
Type: Parameter
- Description:
- Parton shower cut-off mass for QCD emissions.
Default value: 1
Minimum value: 0
Maximum value: 1e+10
Name: RespectScale
Type: Switch
- Description:
- Use the scale variable of original partons to restrict branchings.
Registered options:
- 0(
No
)
- Don't restrict.
- 1(
Q2
)
- Restrict scale of original parton.
- 2(
PT2
)
- Restrict scale of original parton.
- 3(
ETheta2
)
- Restrict scale of original parton.
- 4(
Theta2
)
- Restrict scale of original parton.
Default value: 0
Name: PhiCoherAsym
Type: Switch
- Description:
- Azimuthal asymmetry induced by colour coherence.
Registered options:
- 0(
No
)
- Don't use Azimuthal asymmetry.
- 1(
Yes
)
- Use Azimuthal asymmetry.
Default value: 1
Name: PhiPolAsym
Type: Switch
- Description:
- Azimuthal asymmetry induced by gluon polarization.
Registered options:
- 0(
No
)
- Don't use Azimuthal asymmetry.
- 1(
Yes
)
- Use Azimuthal asymmetry.
Default value: 1
Name: AngularOrdering
Type: Switch
- Description:
- Determines whether the space-like shower should use angular ordering or not.
Registered options:
- 0(
No
)
- Don't use angular ordering.
- 1(
Yes
)
- Use angular ordering.
Default value: 1
Name: Q2Order
Type: Switch
- Description:
- Usage of strict Q2 ordering.
Registered options:
- 0(
Yes
)
- Use ordering
- 1(
No
)
- No ordering, use maximum kinematically allowed in each branching (toy scenario to be developed).
Default value: 0
Name: FinalCone
Type: Switch
- Description:
- Restrict first emission within cone given by colour flow in hard process.
Registered options:
- 0(
No
)
- No restriction.
- 1(
Yes
)
- Use cone with isotropic phi-angle inside.
- 2(
Anisotropic
)
- Use cone with anisotropic phi-angle inside.
Default value: 2
Name: SoftGluonResum
Type: Switch
- Description:
- Resum the effect of multiple soft gluon emissions.
Registered options:
- 0(
No
)
- Don't use resummation.
- 1(
Yes
)
- Use resummation.
Default value: 1
Name: MEMode
Type: Switch
- Description:
- Use of matrix element corrections.
Registered options:
- 0(
No
)
- Don't use matrix element corrections.
- 1(
Yes
)
- Use matrix element corrections.
Default value: 1
Name: MaxVirtuality
Type: Switch
- Description:
- Maximum virtuality setting the starting point of the evolution.
Registered options:
- 0(
S
)
- Total invariant mass squared.
- 1(
SHat
)
- Invariant mass squared of hard sub-process.
- 2(
MT2
)
- Average of hard sub-process.
- 3(
MinMT2
)
- Smallest in hard sub-process.
Default value: 0
Name: AlphaSMode
Type: Switch
- Description:
- Running of alpha_S in evolution.
Registered options:
- 0(
Fixed
)
- Use fixed .
- 1(
Q2
)
- Running with scale .
- 2(
PT2
)
- Running with scale .
Default value: 2
Name: NQuarks
Type: Integer parameter
- Description:
- Number of allowed quark flavours in branching.
Default value: 5
Minimum value: 0
Maximum value: 8
Name: LeptonShower
Type: Switch
- Description:
- Which kind of ISR shower is allowed for incoming leptons.
Registered options:
- 0(
None
)
- No ISR allowed.
- 1(
Photon
)
- Only photon emission.
- 2(
SpacePhoton
)
- Photon emission and space-like photon branchings (if supported by the PDF).
Default value: 1
Name: HadronShower
Type: Switch
- Description:
- Which kind of ISR shower is allowed for incoming hadrons.
Registered options:
- 0(
None
)
- No ISR allowed.
- 1(
QCD
)
- Only QCD emissions.
- 2(
Photon
)
- QCD and photon emissions.
- 3(
SpacePhoton
)
- QCD, photon emissions and space-like photon branchings (if supported by the PDF).
Default value: 2
Generated on Thu Apr 29 12:45:33 2010 for Pythia7 by
1.5.5