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Study of the top reconstruction in top‐partner events at the LHC

In the Littlest Higgs model with T‐parity (LHT), top‐partners (T−) are produced in pairs at the Large Hadron Collider (LHC). Each top‐partner decays into a top quark (t) and the lightest T‐odd gauge partner AH. We demonstrate reconstruction of the tt system decaying hadronically and measurement of the top‐partner mass from the mT2 distribution. A top quark from a T− decay is polarized, and we discuss the effect of this polarization on the decay distributions.