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Volume 265 - XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2016) - WG4: Heavy flavours (charm, beauty and top)
Top quark mass calibration for Monte-Carlo event generators
M. Butenschoen, B. Dehnadi, A. Hoang,* V. Mateu, M. Preisser, I.W. Stewart
*corresponding author
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Published on: 2016 November 09
The most precise top quark mass measurements use kinematic reconstruction methods, determining the top mass parameter of a Monte Carlo event generator, m_t^MC. Due to the complicated interplay of hadronization and parton shower dynamics in Monte Carlo event generators, relating m_t^MC to field theory masses is a non-trivial task. In this talk we present a calibration procedure to determine this relation using hadron level QCD predictions for 2-Jettiness in e^+e^- annihilation, an observable which has kinematic top mass sensitivity and has a close relation to the invariant mass of the particles coming from the top decay. The theoretical ingredients of the QCD prediction are explained. Fitting e^+e^- 2-Jettiness calculations at NLL/NNLL order to Pythia 8.205, we find that
m_t^MC agrees with the MSR mass at the scale 1 GeV within uncertainties, m_t^MC ~ m_t^MSR(1 GeV), but differs from the pole mass by 900/600 MeV.
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