6,324 research outputs found
Top quark spin in ep collision
We discuss the degree of spin polarization of single top quarks produced via
fusion process in collision at TESLA+HERAp and CLIC+LHC energies
and 5.3 TeV. A description on how to combine the cross sections
of and processes is given.
-beam direction is taken to be the favorite top quark spin decomposition
axis in its rest frame and it is found to be comparable with the ones in
collision. It is argued that theoretical simplicity and experimental clearness
are the advantage of collision.Comment: 2 eps figure
Top Quark Spin Polarization in ep Collision
We discuss the degree of spin polarization of single top quarks produced via
fusion process in collision at TESLA+HERAp and CLIC+LHC energies
and 5.3 TeV. For subprocess we show that
the top quark spin is completely polarized when the spin basis is chosen in the
direction of the incoming positron beam in the rest frame of top quark. A
description on how to combine the cross sections of and
processes is given. -beam direction is
taken to be the favorite top quark spin decomposition axis in its rest frame
and it is found to be comparable with the ones in collision. It is argued
that theoretical simplicity and experimental clearness are the advantage of
collision.Comment: Revised version of Phys. Rev. D69 (2004)03401
Top Quark Spin Polarization in e \gamma Collision
We investigate the degree of spin polarization of single top quarks in the
collision via the process
with center of mass energies =0.5, 1 and 1.5 TeV of the parental
linear collider. Dominant spin fractions and spin asymmetries for
the various top quark spin bases are investigated. We show that -beam
direction is the favorite top quark spin decomposition axis. It is found to be
comparable with the ones in and collisions.Comment: 5 pages, 3 figure
Top quark and Electroweak measurements at the Tevatron
We present recent preliminary measurements at the Tevatron of t-tbar and
single top production cross section, top quark mass and width, top pair spin
correlations and forward-backward asymmetry. In the electroweak sector, we
present the Tevatron average of the W boson width, and preliminary measurements
of the W and Z forward-backward asymmetries and WZ, ZZ diboson production cross
sections. All measurements are based on larger amount of collision data than
previously used and are in agreement with the standard model.Comment: 6 pages, 6 figures; In proceedings of the 16th International
Symposium on Particles, Strings and Cosmology, Valencia (Spain) 201
Top quark properties
The multi-purpose experiments at CERN's Large Hadron Collider have a very
rich programme in top quark physics. The large amount of data allows for
measuring the top quark properties with an unprecedented precision. This
document presents some of the properties that have been measured using top
quark pair events produced in proton-proton collisions with a centre-of-mass
energy of 13 TeV. The focus lies on the measurements of the colour flow, the
charge asymmetry and spin correlations in top quark pair events.Comment: 5 pages, 6 figures, TOP2018 conference proceeding
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