Volume 82, Number 1, April 2008
Article Number 11002
Number of page(s) 5
Section The Physics of Elementary Particles and Fields
Published online 17 March 2008
EPL, 82 (2008) 11002
DOI: 10.1209/0295-5075/82/11002

New gauge boson Z$^\prime$ and the spin correction of top quark pair production at e+e- colliders

Y.-B. Liu1, X.-L. Wang2 and Q. Chang2

1  Henan Institute of Science and Technology - Xinxiang 453003, PRC
2  College of Physics and Information Engineering, Henan Normal University - Xinxiang 453007, PRC

received 21 December 2007; accepted in final form 13 February 2008; published April 2008
published online 17 March 2008

In the off-diagonal basis, we explore the effects of the extra neutral gauge boson Z$^\prime$ predicted by the SU(3) simple group model on the spin configuration of the top quark pair production in the high-energy linear e+e- collider (ILC). We find that the new gauge boson Z$^\prime$ exchange can generate significant corrections to the differential cross-sections for the $t\uparrow\bar{t}\downarrow$ and $t\downarrow\bar{t}\uparrow$ states. The production cross-sections for the like-spin states, which vanish in the standard model, can be significantly large as MZ' $\approx\sqrt{s}$. We expect that the effects of the new gauge boson Z$^\prime$ on the spin configurations of the top quark pairs production might be observed in future ILC experiments.

12.60.Cn - Extensions of electroweak gauge sector.
14.65.Ha - Top quarks.
14.70.Pw - Other gauge bosons.

© EPLA 2008