Münster 2017 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 40: Top Quark (Theorie) 2
T 40.5: Vortrag
Dienstag, 28. März 2017, 12:00–12:15, VSH 05
Calibration of the top quark mass for Monte Carlo event generators — •Bahman Dehnadi1, Andre H. Hoang2, Vicent Mateu3, Moritz Preisser2, and Iain W. Stewart4 — 1University of siegen, Siegen, Germany — 2University of Vienna, Vienna, Austria — 3Universidad de Salamanca, Salamanca, Spain — 4MIT, Cambridge, Massachusetts, USA
The most precise top quark mass measurements use direct reconstruction methods, determining the top mass parameter of a Monte Carlo event generator, mtMC. Due to hadronization and parton shower dynamics, relating mtMC to a field theory mass is difficult. We present a calibration procedure to determine this relation by exploiting hadron level QCD predictions for observables closely related to reconstruction. We demonstrate the procedure using fits to the 2-Jettiness distribution in e+ e− annihilation and show the calibration results for mtMC in Pythia 8.205 for the MSR mass at the scale 1 GeV and the pole mass at NNLL+NLO accuracy. To the extend that a given MC makes consistent descriptions of experimental data for e+ e− versus pp collisions our method may be used to calibrate measurements of mtMC in current LHC and Tevatron analyses in terms of field theory mass schemes.