Higgs Processes
This page contains Higgs production within and beyond the Standard Model.
It is at a very early stage.
Standard-Model Higgs
flag
SMHiggs:all
(default = off
)
Common switch for the group of Higgs production within the Standard Model.
flag
SMHiggs:ffbar2H
(default = off
)
Scattering f fbar -> H^0, where f sums over available
flavours except top.
Code 801.
flag
SMHiggs:gg2H
(default = off
)
Scattering g g -> H^0.
Code 802.
flag
SMHiggs:gmgm2H
(default = off
)
Scattering gamma gamma -> H^0.
Code 803.
flag
SMHiggs:ffbar2HZ
(default = off
)
Scattering f fbar -> H^0 Z^0.
Code 804.
flag
SMHiggs:ffbar2HW
(default = off
)
Scattering f fbar -> H^0 W^+-.
Code 805.
flag
SMHiggs:qg2Hq
(default = off
)
Scattering q g -> H^0 q. This process gives first-order
corrections to the f fbar -> H^0 one above (for
f = q ), so both cannot be used simultaneously without
unphysical doublecounting. The current one should only be used to study
the high-pT tail, while f g -> H^0 f should be used for
inclusive production. Therefore this process is not switched on by
the SMHiggs:all
flag.
Code 806.
Parameters for Higgs production and decay
flag
ResonanceH::linearWidthWWZZ
(default = on
)
The partial width of a Higgs particle to a pair of gauge bosons,
W^+ W^- or Z^0 Z^0, depends cubically on the
Higgs mass. When selecting the Higgs according to a Breit-Wigner,
so that the actual mass mHat does not agree with the
nominal m_Higgs one, an ambiguity arises which of the
two to use [Sey95]. The default is to use a linear
dependence on mHat, i.e. a width proportional to
m_Higgs^2 * mHat, while off
gives a
mHat^3 dependence. This does not affect the width to
fermions, which only depends on mHat.
mode
SMHiggs:parity
(default = 1
; minimum = 0
; maximum = 3
)
possibility to modify angular decay correlations in Higgs decay to
Z^0 Z^0 or W^+ W^- to four fermions. Currently it
does not affect the partial width of the channels.
option
0 : isotropic decays.
option
1 : assuming the Higgs is a pure scalar (CP-even),
as in the Standard Model.
option
2 : assuming the Higgs is a pure pseudoscalar
(CP-odd).
option
3 : assuming the Higgs is a mixture of the two,
including the CP-violating interference term. The parameter
eta, see below, sets the strength of the CP-odd admixture,
with the interference term being proportional to eta
and the CP-odd one to eta^2.
parm
SMHiggs:etaParity
(default = 0.
)
The eta value of CP-violation in the
SMHiggs:parity = 2
option.