Page 5 of 9 An inter-woven structure
An example of the
intended general structure, based on a modular construction around some of the tools
being developed by the collaboration, is depicted in the Figure below. Such a structure naturally allows analyses at
the colliders and in indirect detection. Such a structure reinforces the
complementarity of the teams involved in
the project.
As emphasized
above, one of the forte of the project revolves around the exploitation of the
automatic calculation of cross sections both at tree-level and, for SUSY, at
one-loop. We can therefore quite easily implement any new model of New Physics
at the Lagrangian level and pass it to micrOMEGAs
that originally was set up to generate cross sections for the relic density
calculations. micrOMEGAs can now also
provides cross sections for colliders and for indirect detection. This part of
the project is carried by the particle theorists team. These cross sections can
then be used for predictions for indirect detection. This step, however, requires a substantial input from the
theoretical astrophysicists as well as their experimental counterpart in the
team. Indeed the ongoing collaboration[12,23] intends to implement
sophisticated codes for the propagation of charged particles, modelling of the
halo profiles as well as detailed description of dense substructure (clumps).
An interface with PYTHIA and later HERWIG for fragmentation and decay is the
job of the experimental astrophysics team, whose other input is the modelling
of the background and full simulation including detector resolutions.
At the same time,
cross sections for the same New Physics model provided by micrOMEGAs will be exploited by the collider physics team. An
important tool here will be a generalisation of SFitter to models of New Physics other than supersymmetry. From a
simulation of well chosen observables, SFitter
will return ``measurements" on the fundamental and underlying parameters of the New Physics. In the context of Dark Matter this can serve
for a ``collider determination of the relic density" to be compared with the
more direct value extracted from a combination of cosmological and
astrophysical measurements. This is another reason we would also like to
generalise micrOMEGAs to take into
account scenarios for the early universe that deviate from the pure assumption
of thermal relics and radiation domination (kination[2], etc..). A collaboration between the two theory teams is
foreseen. Of course, at this point, comparison of data or simulations from the
colliders and from the astrophysics experiments is also to be carried within
our collaboration, with due care to the astrophysical uncertainties for
example.
We want, within
this project, to improve even further on
this scheme, especially as concerns supersymmetry. This is another important
facet of our project. micrOMEGAs,
though very complete, is to a large extent
based on tree-level calculations. It is crucial, especially in order to
match the accuracy of PLANCK and the ILC, to give predictions at the loop
level. We are developing the automatic code SloopS
for this purpose. This code will then be exploited by micrOMEGAs and SFitter,
as well as SDECAY. The most
characteristic signal of DM annihilation into monochromatic gamma rays is also
loop induced and therefore can be tackled by SloopS. We therefore view the development of SloopS as essential.
The problem of
flavour is also on our agenda, in particular some effort is being devoted to a
new powerful routine for bÒs γ[22].
This observable is very sensitive to New Physics.
Having
all these tools and codes at our disposal we will be able to conduct
trustworthy global analyses of the kind described in. One more important
addition, with the automatic codes we are developing and the modular structure
we are setting up, it will be easy for us to implement novel models swiftly.
Should for example the LHC hint at new signals that would be hard to interpret
within today's popular scenarios, our task force can react rapidly by
implementing new effective theories and confirming the consistency of the
proposal both at the LHC, indirect precision measurements (g-2, bÒs γ..)
and in astrophysics experiments.
Let us
now turn to some of the details and in part technicalities of the project.
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