Useful References for Group 9 (from Y. Nir)

 
Here are a few thoughts (and potentially useful references) about
the questions that we want to answer.
 
Standard Model:
---------------
Buras has tried, in the last few years, to see how the unitarity
triangle might look in the future. We might want to look in his
work, e.g. hep-ph/9509329.

 We should use the input from other groups
to see how well we can do with (a) CP asymmetries alone, (b) B factory
measurements alone and (c) all available data combined.
We may also want to think whether, for various purposes, different
presentations (beyond the \rho-\eta or \sin2\alpha-\sin2\beta planes)
might be useful.
 
New Physics:
------------
We should distinguish, in our investigation, between models that can
be `discovered' in (but not excluded by) a B factory and extensions
that can be excluded.
 
The best examples for the first type are extensions of the quark sector
(e.g. down quark singlets or, less likely, a fourth generation) and
certain types of supersymmetry (e.g. "heavy supersymmetry" -- see
Cohen, Kaplan, Nelson in hep-ph/9610252, or "alignment models" --
see my own work in hep-ph/9607415). For these, we should ask:
(1) What are the maximal possible effects, namely what precision
would it take to start probing the parameter space of the model?
(2) What are the central values of the effects, namely with what
precision are we really likely to see a signal if this New Physics
is there.
Note that we can never exclude these models with CP asymmetries,
because the phases -- even if independent of the CKM phase --
might accidentally have values within the SM ranges, thus giving
the same asymmetries.
 
The best examples of models that can be excluded are
(a) Models of quark mass matrices, e.g. horizontal symmetries
(expect a relevant paper by Barbieri and Hall in the very near future)
or (less interesting) ansatze. These models sometimes allow only a very
narrow range for the CP asymmetries.
(b) Models where all CP violating phases are small and therefore all
the asymmetries are expected to be very small. (I remember one paper
by Pomarol in the SUSY framework, but there are more -- I will send you
the references when I find them.)
 
Regarding New Physics, there appeared two very relevant works recently:
Gronau and London, hep-ph/9608
Silva and Wolfenstein, hep-ph/9610208. 
Both may be useful for thinking about the questions we want to answer.