Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-05-30
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 4 figures. To be published in the proceedings of the theory meeting on physics at Linear Colliders, 15 - 17 March 20
Scientific paper
We explore signatures of large extra dimensions with a polarized electron/positrn beam at the Joint Linear Collider (JLC). We point out that spin informations can be useful to study indirect signals for large extra dimensions due to spin-2 nature of Kaluza-Klein gravitons. The spin configurations of the top quark pair production at $e^+ e^-$ and $\gamma \gamma$ collisions provide an unique testing ground to search for effects of the large extra dimensions. Especially we show the forward-backward asymmetry is a good probe at $e^+ e^- \to t \bar{t}$ process and we can define a new asymmetry observable effective for $\gamma \gamma \to t \bar{t}$ process.
Lee Kang Young
Park Seong Chan
Song Hee Sung
Song JeongHyeon
Yu Chaehyun
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