Spin configuration of top quark pair production with large extra dimensions at photon-photon colliders

Abstract

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.

18 pages, 4 figures, ReVTeX

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• Top quark Kaluza-Klein mode mixing in the Randall-Sundrum bulk Standard Model and B -> X_s gamma
• Large Extra Dimension effects through Light-by-Light Scattering at the CERN LHC
• Effects of unparticle on top spin correlation at the Large Hadron Collider
• Enhancement of the Higgs pair production at LHC; the MSSM and extra dimension effects
• Probing Z' gauge boson with the spin configuration of top quark pair production at future $e^{-}{e}^{+}$ linear colliders
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• Collider Implications of Multiple Non-Universal Extra Dimensions
• The scalars from the topcolor scenario and the spin correlations of the top pair production at the LHC
• Measuring the Spin of Invisible Massive Graviton Excitations at Future Linear Colliders
• Neutral Triple Gauge Boson production in the large extra dimensions model at linear colliders