flag
Vincia:CheckAntennae
(default = on
)mode
Vincia:nPointsCheck
(default = 1000
; minimum = 0
; maximum = 1e6
)parm
Vincia:PacceptFuss
(default = 1.05
; minimum = 1.0
; maximum = 2.0
)parm
Vincia:PacceptFussPT0
(default = 1.0
; minimum = 0.0
; maximum = 10.0
)flag
Vincia:PrintPacceptVariations
(default = off
)flag
Vincia:PrintReWeightVariations
(default = off
)parm
Vincia:deadZoneAvoidance
(default = 0.0001
; minimum = 0.0
; maximum = 1.0
)Within the antenna formalism, the collinear singularity of two gluons j and k is distributed between two neighboring antennae. One contains the singularity for j becoming soft, one the singularity for k becoming soft. In showers based on so-called global antenna functions (as opposed to sector functions, which are no longer implemented in VINCIA), the two antennae share the collinear singularity, j||k, point by point in phase space, and only after summing over both is the full collinear AP splitting kernel recovered. The parameter below controls the repartition ambiguity and gives the value of "half" the gluon splitting function on its finite end.
parm
Vincia:octetPartitioning
(default = 0.0
; minimum = 0.0
; maximum = 1.0
)Note that the sector shower cannot be used in this version of VINCIA. In order to use the sector shower shower for the final state in electron-positron annihilation we refer to Vincia version 1.X.
Note that the one-loop matching cannot be used in this version of Vincia. In order to use it for Z decay electron-positron annihilation we refer to Vincia version 1.X.
flag
Vincia:hyperjet
(default = off
)on
, VINCIA will automatically
use modified gluon emission antenna functions, in which the Eikonal (soft)
terms have been subtracted out, for the showers off the hardest
interaction. The gluon splitting antennae and the gluon emission
antennae for radiation inside resonance decays (and for showers off
MPI) are left
unmodified. Since the modified gluon emission antennae no longer contain
a soft singularity, this will NOT generate the correct DGLAP evolution
if used together with normal matrix elements for the hard
process. This option is therefore only intended for use together with
matrix element events in which the soft Eikonal has already been
resummed, such as when VINCIA is used together with J. Andersen's
high-energy-limit matrix elements. Since these matrix element
expressions are correct in the high-y-per-jet limit,
we have dubbed this running mode HyperJet
.
flag
Vincia:postponeMarkov
(default = off
)