2005/03/18 by Sun Hao, Zhang Ren-You, Zhou Pei-Jun +3
Physics and Astronomy · #Particle Detector Development and Performance #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.71.075005
published as Phys.Rev. D71 (2005) 075005 · To be appeard in Physical Review D
arxiv created 2005/03/18 · openalex publication_date 2005/04/15 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
In the framework of the large extra-dimensions (LED) model, the effects of LED on the processes \ensuremathγ\ensuremathγ\ensuremath→tth0 and e+e^\ensuremath-\ensuremath→tth0 at future linear colliders are investigated in both polarized and unpolarized collision modes. The results show that the virtual Kaluza-Klein graviton exchange can significantly modify the standard model expectations for these processes with certain polarizations of initial states. The process \ensuremathγ\ensuremathγ\ensuremath→tth0 with √(s)=3.5 TeV allows the effective scale \ensuremathΛT to be probed up to 7.8 and 8.6 TeV in the unpolarized and P_\ensuremathγ=0.9, J=2 polarized \ensuremathγ\ensuremathγ collision modes, respectively. For the e+e^\ensuremath-\ensuremath→tth0 process with √(s)=3.5 TeV, the upper limits of \ensuremathΛT to be observed can be 6.7 and 7.0 TeV in the unpolarized and P_e+=0.6, P_e^\ensuremath-=0.8, \ensuremath-+ polarized e+e^\ensuremath- collision modes, respectively. We find the \ensuremathγ\ensuremathγ\ensuremath→tth0 channel in J=2 polarized photon collision mode provides a possibility to improve the sensitivity to the graviton tower exchange.