VINCIA Antenna Functions
2->3 Antennae
qqbar gluon emission antenna
The default coefficients are derived from Z decay and absorb
the tree-level matrix element for Z->qgqbar into the shower off Z->qqbar.
flag
Vincia:qQ:emit
(default = on
)
parm
Vincia:qQ:emit:chargeFactor
(default = 2.66666667
)
parm
Vincia:qQ:emit:LaurentC(-1,-1)
(default = 2.0
)
parm
Vincia:qQ:emit:LaurentC(-1,0)
(default = -2.0
)
parm
Vincia:qQ:emit:LaurentC(0,-1)
(default = -2.0
)
parm
Vincia:qQ:emit:LaurentC(-1,1)
(default = 1.0
)
parm
Vincia:qQ:emit:LaurentC(1,-1)
(default = 1.0
)
parm
Vincia:qQ:emit:LaurentC(0,0)
(default = 0.0
)
parm
Vincia:qQ:emit:LaurentC(1,0)
(default = 0.0
)
parm
Vincia:qQ:emit:LaurentC(0,1)
(default = 0.0
)
qg gluon emission antenna
The GGG coefficients were derived from neutralino decays and do not
absorb any particular physically relevant matrix element into the
shower. We have therefore here modified the color factor and the
finite terms by comparing to Z->qggqbar. By charge conjugation symmetry,
the code also uses this function for qbar-g antennae,
with appropriate swapping of invariants.
flag
Vincia:qg:emit
(default = on
)
parm
Vincia:qg:emit:chargeFactor
(default = 2.8333333
)
parm
Vincia:qg:emit:LaurentC(-1,-1)
(default = 2.0
)
parm
Vincia:qg:emit:LaurentC(-1,0)
(default = -2.0
)
parm
Vincia:qg:emit:LaurentC(0,-1)
(default = -2.0
)
parm
Vincia:qg:emit:LaurentC(1,-1)
(default = 1.0
)
parm
Vincia:qg:emit:LaurentC(-1,1)
(default = 1.0
)
parm
Vincia:qg:emit:LaurentC(2,-1)
(default = -1.0
)
parm
Vincia:qg:emit:LaurentC(0,0)
(default = 1.5
)
parm
Vincia:qg:emit:LaurentC(1,0)
(default = -1.0
)
parm
Vincia:qg:emit:LaurentC(0,1)
(default = -0.5
)
gg gluon emission antenna
The default coefficients are derived from H->gg(g) decay and absorb
the tree-level matrix element for H->ggg into the shower off H->gg.
flag
Vincia:gg:emit
(default = on
)
parm
Vincia:gg:emit:chargeFactor
(default = 3.0
)
parm
Vincia:gg:emit:LaurentC(-1,-1)
(default = 2.0
)
parm
Vincia:gg:emit:LaurentC(-1,0)
(default = -2.0
)
parm
Vincia:gg:emit:LaurentC(0,-1)
(default = -2.0
)
parm
Vincia:gg:emit:LaurentC(-1,1)
(default = 1.0
)
parm
Vincia:gg:emit:LaurentC(1,-1)
(default = 1.0
)
parm
Vincia:gg:emit:LaurentC(2,-1)
(default = -1.0
)
parm
Vincia:gg:emit:LaurentC(-1,2)
(default = -1.0
)
parm
Vincia:gg:emit:LaurentC(0,0)
(default = 2.66666667
)
parm
Vincia:gg:emit:LaurentC(1,0)
(default = -1.0
)
parm
Vincia:gg:emit:LaurentC(0,1)
(default = -1.0
)
qg gluon splitting antenna
The default values are derived from neutralino decays and do not
absorb any particular physically relevant matrix element into the
shower. However, the finite terms have been reduced from GGG,
in order to avoid the finite terms being solely responsible for large dead zones.
Note: only half a gluon is splitting here.
flag
Vincia:qg:split
(default = on
)
parm
Vincia:qg:split:chargeFactor
(default = 1.0
)
parm
Vincia:qg:split:LaurentC(-1,-1)
(default = 0.0
)
parm
Vincia:qg:split:LaurentC(-1,0)
(default = 0.0
)
parm
Vincia:qg:split:LaurentC(-1,1)
(default = 0.0
)
parm
Vincia:qg:split:LaurentC(0,-1)
(default = 0.5
)
parm
Vincia:qg:split:LaurentC(1,-1)
(default = -1.0
)
parm
Vincia:qg:split:LaurentC(2,-1)
(default = 1.0
)
parm
Vincia:qg:split:LaurentC(0,0)
(default = -0.4
)
parm
Vincia:qg:split:LaurentC(1,0)
(default = 0.8
)
parm
Vincia:qg:split:LaurentC(0,1)
(default = 0.0
)
gg gluon splitting antenna
The default coefficients are derived from H->gg->gqbarq decays and absorb
the tree-level matrix element for H->gqbarq into the shower off
H->gg. However, the finite terms have been scaled down a bit here,
in order to avoid the finite terms being solely responsible for large dead zones.
Note: only half of each gluon is splitting here.
flag
Vincia:gg:split
(default = on
)
parm
Vincia:gg:split:chargeFactor
(default = 1.0
)
Note: the two permutations g-g -> g-qbar+qbar and g-g -> qbar+q-g are
explicitly summed over in the code (with appropriate swapping of
invariants in the latter case).
parm
Vincia:gg:split:LaurentC(-1,-1)
(default = 0.0
)
parm
Vincia:gg:split:LaurentC(-1,0)
(default = 0.0
)
parm
Vincia:gg:split:LaurentC(-1,1)
(default = 0.0
)
parm
Vincia:gg:split:LaurentC(0,-1)
(default = 0.5
)
parm
Vincia:gg:split:LaurentC(1,-1)
(default = -1.0
)
parm
Vincia:gg:split:LaurentC(2,-1)
(default = 1.0
)
parm
Vincia:gg:split:LaurentC(0,0)
(default = -0.8
)
parm
Vincia:gg:split:LaurentC(1,0)
(default = 0.8
)
parm
Vincia:gg:split:LaurentC(0,1)
(default = 0.4
)
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