DOI 10.1007/s100529800981
Gluon polarization in :
polar angle dependence and beam polarization effects
S. Groote - J.G. Körner - J.A. Leyva
Institut für Physik, Johannes-Gutenberg-Universität, Staudinger Weg 7, D-55099 Mainz, Germany
Received: 29 June 1998 / Published online: 19 October 1998
Abstract
We calculate the linear and circular polarization of gluons produced in
conjunction with massive quarks in the annihilation process
. The linear polarization is calculated in the
hadron event plane as well as in the gluon-beam plane. Beam polarization
and polar orientation effects are included in our discussion. For typical
top pair production energies at the Next-Linear-Collider (NLC) the degree
of linear polarization in the hadron event plane remains close to its soft
gluon value of 100% over most of the energy spectrum of the gluon. The
linear polarization in the gluon-beam plane is generally smaller but peaks
toward the hard end of the gluon spectrum. The dependence of the linear
polarization on beam polarization and on the polar orientation of the
gluon is small. The circular polarization is largest for maximal gluon
energies and shows a strong dependence on the longitudinal beam
polarization. The longitudinal polarization of the beam may therefore be
used to tune the circular polarization of the gluon. The massive quark
results are compared with the corresponding results for the massless quark
case.
Copyright Springer-Verlag