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We calculate the production rates of the second Kaluza-Klein (KK) photon$\gamma^{(2)}$ and Z boson $Z^{(2)}$ at the LHC including all significantprocesses in the minimal Universal Extra Dimension (MUED) model. Fordiscrimination of the MUED model from other TeV scale models at the LHC,$\gamma^{(2)}$ and $Z^{(2)}$ play a crucial role. In order to discuss thediscrimination and calculate their production rates, we derive KK numberviolating operators including the contribution of the top Yukawa coupling.Using these operators, we accurately calculate branching ratios of second KKparticles. In addition we find that these KK number violating operators providenew processes for $\gamma^{(2)}$ and $Z^{(2)}$ productions, such as cascadedecay from second KK quarks produced through these operators. They have largecontributions to their total production rates. In particular, these productionprocesses give the dominant contribution for $\gamma^{(2)}$ production for $1/R\gtrsim 800$ GeV. As a result, with an integrated luminosity of 100 fb$^{-1}$,the number of produced $\gamma^{(2)}$ and $Z^{(2)}$ are estimated as 10$^6$ -10$^2$ for the compactification scale between 400 GeV and 2000 GeV.

Productions of second Kaluza-Klein gauge bosons in the minimal universal extra dimension model at LHC