Abstract
Since the discovery of the top-quark at the Tevatron collider in 1995, enormous efforts have been devoted to the precise determination of its properties and in particular of its mass, mtop. Together with precision electroweak measurements, mtop can be used to check the Higgs boson mass (mH) dependencies on mtop and the W boson mass (mW) within the Standard Model, and to constrain the allowed mass range for heavy particles predicted by Standard Model extensions. In this paper a review of the current experimental and theoretical uncertainties affecting the top-quark mass measurements at the Tevatron and the LHC is provided: strategies and techniques adopted to evaluate the main systematic uncertainties within the various experiments are summarised and compared, highlighting, when appropriate, complementarities and differences which are important ingredients to set the basis of a future world mtop combination.
Highlights
The top-quark mass is a fundamental parameter of the Standard Model of particle physics (SM)
On the event modelling side, important ingredients are related to the description of the underlying event (UE), via Monte Carlo generator (MC) tunes, and the settings adopted for the modelling of colour reconnection (CR), extra QCD radiation and the description of additional interactions accompanying the hard scatter
The mtop uncertainty is currently dominated by the systematic contributions stemming from the modelling of signal events, and the knowledge of the jet energy scale for light- and bquark originated jets
Summary
The top-quark mass is a fundamental parameter of the Standard Model of particle physics (SM). A large effort has been undertaken to the precise mtop determination both at the Tevatron and the LHC colliders. The time evolution of the Tevatron and the LHC measurements is displayed in Figures 1 and 2, respectively. Except for the very early Tevatron measurements systematic uncertainties are dominating; these can be grouped into three main categories: theoretical, experimental and background related uncertainties. The discussion will be based on information from direct mtop measurements included either in the present Tevatron and LHC combinations, or presented for the first time at the TOP2012 conference [1, 2, 3]. Jet resolution and reconstruction ETmissmodelling in-situ jet energy scale stat. component
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