Calibration of the top quark mass for Monte-Carlo event generators
Nov 15, 2016
8 pages
Part of Proceedings, 38th International Conference on High Energy Physics (ICHEP 2016) : Chicago, IL, USA, August 3-10, 2016, 698
Published in:
- PoS ICHEP2016 (2016) 698
Contribution to:
- , 698
- ICHEP 2016
- Published: Nov 15, 2016 by SISSA
DOI:
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Abstract: (PoS)
The most precise top quark mass measurements use kinematic reconstruction methods, deter- mining the top mass parameter of a Monte Carlo event generator, m MC t . Due to the complicated interplay of hadronization and parton shower dynamics in Monte Carlo event generators, relating m MC t 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 P YTHIA 8.205, we find that m MC t agrees with the MSR mass at the scale 1 GeV within uncertainties, m MC t ' m MSR t , 1 GeV , but differs from the pole mass by 900/600 MeV.- top: mass
- mass: pole
- top: decay
- electron positron: annihilation
- parton: showers
- hadronization
- Monte Carlo
- quantum chromodynamics
- higher-order: 1
- higher-order: 2
References(28)
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