DOI: 10.1140/epjc/s2002-01094-1
Multi-parameter fits to the
threshold observables
at a future
e+e- linear collider
M. Martinez1 and R. Miquel2
1 Institut de Física d'Altes Energies, Univ. Aut. de Barcelona, 08193 Bellaterra (Barcelona), Spain
2 Lawrence Berkeley National Laboratory, Physics Division, 1 Cyclotron Road, Berkeley, CA 94720, USA
(Received: 25 July 2002 / Revised version: 23 October 2002 / Published online: 13 December 2002 )
Abstract
A realistic study of the physics reach of a
threshold
scan at a
future
e+e- linear collider is presented.
The results obtained take into account experimental and, to a
large extent,
theoretical systematic errors, as well as beam effects. Because
of
the large correlations between the physical parameters that can
be extracted
from the threshold scan, a multi-parameter
fit is seen as mandatory. It is shown that the top mass, the
top width and
can
be extracted simultaneously with uncertainties around 20 MeV,
30 MeV and 0.0012,
respectively, while
the top Yukawa coupling can be measured, with the previous three
parameters, to
an uncertainty of about 35%, after
assuming an external prior on
of
.
© Società Italiana di Fisica, Springer-Verlag 2003
