Proposed topics:
1. Measurement of the top mass
We should first of all collect
information on the studies done by Atlas and CMS. We need a list of measurement
strategies, and for each of these a study of the respective experimental
and theoretical systematics. Theoretical systematics fall in two categories:
-
perturbative (presumably relevant for
measurement with accuracy at the 2 GeV level):
-
dependence of mtop on jet definitions
-
effect of initial and final state radiation
-
effects of higher-order matrix element
corrections
-
non-perturbative (presumably relevant
for measurement with accuracy at the 1 GeV and below level):
-
interconnection issues
-
effects of the underlying event
-
definition of the top mass
As a minimal goal for the Workshop,
we should aim at
-
proving that a measurement with a 1.5-2
GeV accuracy is possible
-
listing and defining the problems that
have to be solved to improve the accuracy to the level of 1 GeV
-
review the impact of a given top-mass
precision on theoretical expectations for the top mass (both within and
beyond the SM)
Names of people potentially interested
in this subject:
Theory: G. Corcella, V. Khoze, T. Sjostrand,
A. Hoang, M. Kraemer, J. Ellis , O. Yakovlev
Atlas:
CMS:
2. Cross-sections and distributions
Goals:
-
Update theoretical predictions on cross-sections
and production properties. This can include:
-
spin correlations
-
production asymmetries
-
finite-width effects on production
kinematics and rates
-
Incorporate refinements in the description
of production and decay in the MC event generators
-
Study the accuracy with which the above
distributions can be measured
-
Study limits on possible new physics
which can be set using these measurements. For example:
-
limits on resonances in the m(t-tbar)
spectrum
-
limits on contact interactions from
the top pt spectrum
-
studies of CP violation in the production
and decay
Names of people potentially interested
in this subject:
Theory: E. Berger, W. Bernreuther, S. Catani,
V. Khoze, J. Kuehn, G. Mahlon, P.Nason, S. Parke, R. Pittau
, T. Sjostrand , O. Yakovlev
Atlas:
CMS:
3. Single-top production
and EWK properties of the top quark
Goals:
-
Update theoretical predictions on single-top
cross-sections and production properties.
-
Incorporate refinements in the description
of production and decay in the MC event generators
-
Study the accuracy with which the above
distributions can be measured, and produce a set of benchmarks for the
possible measurements of
-
top polarization
-
Vtb
-
W polarization in top decays
Names of people potentially interested
in this subject:
Theory: S. Willenbrock, T. Stelzer, Z.
Sullivan, G. Mahlon, S. Martin, T. Tait, C-P Yuan
Atlas:
CMS:
4. Rare decays
Goal is the study of rare decays
within and beyond the SM:
-
FCNC decays: t->cZ, t-> c gamma, etc.
-
decays to charged Higgses
-
SM rare decays: t->sW, t->dW, t->WZb,
etc.
-
.....
We should determine at which level
can these decays be measured, or limits on the BR be set. We should investigate
what can be learned from the relative results, on the SM and on its possible
extensions.
Names of people potentially interested
in this subject:
Theory: S. Slabospitski, T. Han,
C. Kao, K. Matchev, B. Mele, L. Reina, Z. Sullivan ,
M. Lola
Atlas:
CMS:
5. Anomalous couplings and other
unusual production mechanisms
Goals:
Names of people potentially interested
in this subject:
Theory: S. Slabospitski,
Atlas:
CMS:
6. Monte Carlo simulations for
the backgrounds
Topics:
-
W b bbar + jets
-
multijets
-
Interfaces to parton-shower MC's
-
.....
7. Fourth generation heavy quarks