First combination of Tevatron and LHC measurements of the top-quark mass

Understand

We present a combination of measurements of the mass of the top quark, $m_{\rm top}$, performed by the CDF and D0 experiments at the Tevatron collider and the ATLAS and CMS experiments at the Large Hadron Collider (LHC).

• The Tevatron data correspond to an integrated luminosity of up to 8.7 fb${^{-1}}$ of proton-antiproton collisions from Run II of the Tevatron at a centre-of-mass energy of 1.96 TeV.
• The LHC data correspond to an integrated luminosity of up to 4.9 fb${^{-1}}$ of proton-proton collisions from the run at a centre-of-mass energy of 7 TeV.
• The combination includes measurements in the $t\bar t\to$ lepton+jets, $t\bar t\to$ dilepton, $t\bar t\to$ all jets and $t\bar t\to$ $E_{\rm T}^{\rm miss}$+jets final states.