Compositeness Processes
Compositeness scenarios may give rise to sharp resonances of excited
quarks and leptons. An excited copy of the first generation is
implemented, consisting of spin 1/2 particles.
The current implementation contains gauge interaction production
by quark-gluon fusion or lepton-photon fusion and contact interaction
production by quark-quark or quark-antiquark scattering. In additions
to the compositness scale and couplings listed below, you are expected
to change the excited-fermion masses in accordance with what is desired.
See [Bau90] for conventions.
A non-trivial angular dependence is included in the decay for the
2 -> 1 processes, but has not been included for the
2 -> 2 ones.
Production processes
A few different production processes have been implemented, which normally
would not overlap and therefore could be run together.
flag ExcitedFermion:all
(default = off)
Common switch for the group of implemented processes that produce an
excited fermion.
flag ExcitedFermion:dg2dStar
(default = off)
Scatterings d g -> d^*.
Code 4001.
flag ExcitedFermion:ug2uStar
(default = off)
Scatterings u g -> u^*.
Code 4002.
flag ExcitedFermion:sg2sStar
(default = off)
Scatterings s g -> s^*.
Code 4003.
flag ExcitedFermion:cg2cStar
(default = off)
Scatterings c g -> c^*.
Code 4004.
flag ExcitedFermion:bg2bStar
(default = off)
Scatterings b g -> b^*.
Code 4005.
flag ExcitedFermion:egm2eStar
(default = off)
Scatterings e gamma -> e^*.
Code 4011.
flag ExcitedFermion:mugm2muStar
(default = off)
Scatterings mu gamma -> mu^*.
Code 4013.
flag ExcitedFermion:taugm2tauStar
(default = off)
Scatterings tau gamma -> tau^*.
Code 4015.
flag ExcitedFermion:qq2dStarq
(default = off)
Scatterings q q(bar) -> d^* q(bar).
Code 4021.
flag ExcitedFermion:qq2uStarq
(default = off)
Scatterings q q(bar) -> u^* q(bar).
Code 4022.
flag ExcitedFermion:qq2sStarq
(default = off)
Scatterings q q(bar) -> s^* q(bar).
Code 4023.
flag ExcitedFermion:qq2cStarq
(default = off)
Scatterings q q(bar) -> c^* q(bar).
Code 4024.
flag ExcitedFermion:qq2bStarq
(default = off)
Scatterings q q(bar) -> b^* q(bar).
Code 4025.
flag ExcitedFermion:qqbar2eStare
(default = off)
Scatterings q qbar -> e^*+- e^-+.
Code 4031.
flag ExcitedFermion:qqbar2nueStarnue
(default = off)
Scatterings q qbar -> nu_e^* nu_ebar.
Code 4032.
flag ExcitedFermion:qqbar2muStarmu
(default = off)
Scatterings q qbar -> mu^*+- mu^-+.
Code 4033.
flag ExcitedFermion:qqbar2numuStarnumu
(default = off)
Scatterings q qbar -> nu_mu^* nu_mubar.
Code 4034.
flag ExcitedFermion:qqbar2tauStartau
(default = off)
Scatterings q qbar -> tau^*+- tau^-+.
Code 4035.
flag ExcitedFermion:qqbar2nutauStarnutau
(default = off)
Scatterings q qbar -> nu_tau^* nu_taubar.
Code 4036.
Parameters
The basic couplings of the model are
parm ExcitedFermion:Lambda
(default = 1000.; minimum = 100.)
compositeness scale Lambda in GeV.
parm ExcitedFermion:coupF
(default = 1.0; minimum = 0.0)
strength f of the SU(2) coupling.
parm ExcitedFermion:coupFprime
(default = 1.0; minimum = 0.0)
strength f' of the U(1) coupling.
parm ExcitedFermion:coupFcol
(default = 1.0; minimum = 0.0)
strength f_c of the SU(3) coupling.