Associated production of a graviton with an e(+)e(-) pair via photon-photon collisions at a linear collider

作者：Zhou Ya Jin^*; Ma Wen Gan; Han Liang; Zhang Ren You

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2007, 76(5): 054003.

DOI：10.1103/PhysRevD.76.054003

We investigate the process gamma gamma -> e(+)e(-)G(n) 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 TeV, the cross section of this process can reach several hundred fb at a photon-photon collider with root s=500-1000 GeV, and the cross section in the J=2 polarized photon collision mode is much larger than that in the 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 M-S <= 2.67(1.40) TeV and gamma gamma center of mass system energy root s=1000(500) GeV in unpolarized photon collision mode, while the detecting upper limit can be increased to 2.79(1.44) TeV in +- (lambda(1)=1, lambda(2)=-1) polarized photon collision mode (with photon polarization efficiency P-gamma=0.9).

• 出版日期2007-9
• 单位中国科学技术大学