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Associated Productions of HZZ and HHZ at Linear Colliders in Large Extra Dimension Model
Authors:ZHOU Ya-Jin  MA Wen-Gan  HAN Liang  ZHANG Ren-You  JIANG Yi
Institution:Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
Abstract:In this paper we investigate the effects of the large extra dimensions on the two processes e+e-→ H0Z0Z0 and e+e-→ H0Z0Z0 at linear colliders in both unpolarized and polarized collision modes. We find that the virtual Kaluza-Klein graviton exchange can significantly enhance the cross section from their standard model expectations for these two processes. The results show that the LED effect on the process e+e-→ H0Z0Z0 allows the observation limits on the effective scale MS to be probed up to 9.75 TeV and 10.1 TeV in the unpolarized and +-(λe+=1/2, λe-=-1/2) polarized beam collision modes (with Pe+=0.6, Pe-=0.8), respectively. For the process e+e-→ H0Z0Z0, these limits on MS can be probed up to 6.06 TeV and 6.38 TeV in the unpolarized and polarized collision modes separately. We find that the λe+=1/2, λe-=-1/2 polarization collision mode in both process e+e-→ H0Z0Z0 and e+e-→ H0Z0Z0 may provide a possibility to improve the sensitivity in probing the LED effects.
Keywords:large extra dimensions    linear collider  Higgs boson  gauge boson                                                                                                                                        
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