Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-08-09
Phys.Rev.D76:054003,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
Accepted by Phys. Rev. D
Scientific paper
10.1103/PhysRevD.76.054003
We investigate the process \rreeG at the future International Linear Collider(ILC), where G_n is the Kaluza-Klein graviton in the Large Extra Dimension Model. When the fundamental energy scale is of a few ${\rm TeV}$, the cross section of this process can reach several hundred fb at a photon-photon collider with $\sqrt{s}=500 \sim 1000 GeV$, and the cross section in J=2 polarized photon collision mode is much larger than that in J=0 polarized photon collision mode. We present strategies to distinguish the graviton signal from numerous SM backgrounds, and find that the graviton signal with extra dimensions $\delta=3$ can be detected when ${\rm M_S} \le 2.67(1.40) {\rm TeV}$ and $\gamma \gamma$ c.m.s. energy $\sqrt{s}=1000(500) {\rm GeV}$ in unpolarized photon collision mode, while the detecting upper limit can be increased to 2.79(1.44) ${\rm TeV}$ in $+ -$ ($\lambda_1=1$, $\lambda_2=-1$) polarized photon collision mode(with photon polarization efficiency $P_{\gamma}=0.9$).
Liang Han
Ren-You Zhang
Wen-gan Ma
Ya-Jin Zhou
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