Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-10-25
Phys.Rev. D61 (2000) 074005
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 4 figures, ReVTeX
Scientific paper
10.1103/PhysRevD.61.074005
Top quark pair production at photon-photon colliders is studied in low scale quantum gravity scenario. From the dependence of the cross sections on the spin configuration of the top quark and anti-quark, we introduce a new observable, top spin asymmetry. It is shown that there exists a special top spin basis where with the polarized parent electron beams the top spin asymmetry vanishes in the standard model but retains substantial values with the large extra dimension effects. We also present lower bounds of the quantum gravity scale $M_S$ from total cross sections with various combinations of the laser, electron beam, and top quark pair polarizations. The measurements of the top spin state $(t_\uparrow\bar{t}_\downarrow)$ with unpolarized initial beams are shown to be most effective, enhancing by about 5% the $M_S$ bounds with respect to totally unpolarized case.
Lee Kang Young
Park Seong Chan
Song Hee Sung
Song Jeonhyeon
Yu Chaehyun
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