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The top partner as a hallmark of the Littlest Higgs model with $T$-parity(LHT model) has been extensively searched for during the Large Hadron Collider(LHC) Run-1. With the increasing mass limits on the top partner, the singleproduction of the top partner will be dominant over the pair production. Underthe constraints from the Higgs data, the electroweak precision observables and$R_b$, we find that the mass of $T$-even top partner ($T_+$) has to be heavierthan 730 GeV. Then, we investigate the observability of the single $T$-even toppartner production through the process $pp \to T_+ j$ with the sequent decay$T_+ \to th$ in the di-photon channel in the LHT model at the LHC. We find thatthe mass of $T_+$ can be excluded up to 800 GeV at $2\sigma$ level at 14 TeVLHC with the integrated luminosity ${\cal L}=3$ ab$^{-1}$.

Single top partner production in the Higgs to diphoton channel in the Littlest Higgs Model with $T$-parity