Abstract
The large extra dimension model is a promising way to solve the hierarchy problem of the standard model. In this paper we investigate the associated production of $t\overline{t}H$ at the LHC within the large extra dimension model. We present the dependence of the cross section on the fundamental scale ${\mathrm{M}}_{\mathrm{S}}$, and also give the ${p}_{T}$ distribution of the final state particles. The large extra dimension effects enhance the cross section significantly. We also give the discovery limits of ${\mathrm{M}}_{\mathrm{S}}$ on the process $pp\ensuremath{\rightarrow}t\overline{t}H$, which are 14.295, 9.595, 6.93, and 1.235 TeV when the extra dimensions are 3, 4, 5, and 6, respectively.
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