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We propose a new method to measure a theoretically well-defined top quarkmass at the LHC. This method is based on the "weight function method," which weproposed in our preceding paper. It requires only lepton energy distributionand is basically independent of the production process of the top quark. Weperform a simulation analysis of the top quark mass reconstruction with$t\bar{t}$ pair production and lepton+jets decay channel at the leading order.The estimated statistical error of the top quark mass is about $0.4$ GeV withan integrated luminosity of $100$ fb$^{-1}$ at $\sqrt{s}=14$ TeV. We alsoestimate some of the major systematic uncertainties and find that they areunder good control.

Weight function method for precise determination of top quark mass at Large Hadron Collider