Abstract
In this paper we investigate the effects of the large extradimensions on the two processes e+e−→H0Z0Z0 ande+e−→H0H0Z0 at linearcolliders in both unpolarized and polarized collision modes. Wefind that the virtual Kaluza–Klein graviton exchange cansignificantly enhance the cross section from their standard modelexpectations for these two processes. The results show that theLED effect on the process e+e−→H0Z0Z0allows the observation limits onthe effective scale MS to be probed up to 9.75 TeV and 10.1 TeVin the unpolarized and +-(λe+ = 1/2,λe− = −1/2) polarized beam collision modes (with\U0001d4abe+ = 0.6, \U0001d4abe− = 0.8), respectively.For the process e+e−→H0H0Z0, these limits on MS can beprobed up to 6.06 TeV and 6.38 TeV in the unpolarized and polarizedcollision modes separately. We find that the λe+ = 1/2,λe− = −1/2 polarization collision mode in bothprocess e+e−→H0Z0Z0 and e+e−→H0H0Z0may provide a possibility to improve thesensitivity in probing the LED effects.
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