Possibility of determining gluon polarization via polarized top pairs in gamma-proton scattering

Ataǧ, S.; Billur, A.A.

doi:10.1016/j.physletb.2009.04.073

Possibility of determining gluon polarization via polarized top pairs in gamma-proton scattering

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol.676, no.4-5, pp.155-160, 2009 (SCI-Expanded)

Publication Type: Article / Article
Volume: 676 Issue: 4-5
Publication Date: 2009
Doi Number: 10.1016/j.physletb.2009.04.073
Journal Name: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Page Numbers: pp.155-160
Ankara University Affiliated: Yes

Abstract

We study the possibility for directly measuring the polarized gluon distribution in the process γ p → over(t, ̄) t. It is shown that polarization asymmetry of the final top quarks is proportional to the gluon polarization. With available energy and luminosity, the collision of a polarized proton beam and a Compton backscattered photon beam can create polarized top quarks which carry the spin information of the process. Energy dependence and angular distributions of the polarization asymmetry of the top pairs has been discussed including statistical uncertainty. © 2009 Elsevier B.V. All rights reserved.