LHC Combination: Top mass

A combination of top-quark mass measurements performed by the ATLAS and CMS experiments at the LHC is presented. The dataset used corresponds to an integrated luminosity per experiment of up to 4.9~fb$^{-1}$ of proton-proton collisions at a centre-of-mass energy of 7~TeV. The combination includes measurements in the lepton+jets, di-lepton and all-jets channels. The resulting preliminary combined LHC measurement of the top-quark mass is $m_{\rm top} = 173.3 \pm 0.5 \mbox{ (stat)} \pm 1.3 \mbox{ (syst)}$ GeV, with a total uncertainty of $1.4$~GeV