PoS - Proceedings of Science
Volume 260 - Loops and Legs in Quantum Field Theory (LL2016) - Parallel B3
Summing logarithms and factorization for massive quark initiated jets and the Pythia top quark mass
M. Butenschoen, B. Dehnadi, A. Hoang*, V. Mateu, M. Preisser and I.W. Stewart
Full text: pdf
Published on: October 06, 2016
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.
DOI: https://doi.org/10.22323/1.260.0066
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