NLO and off-shell effects in top quark mass determinations

A bstract We study the impact of different theoretical descriptions of top quark pair production on top quark mass measurements in the di-lepton channel. To this aim, the full NLO corrections to pp → W + W − b b ¯ → e + ν e μ − ν ¯ μ b b ¯ production are compared to calculations in the narrow width...

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Bibliographic Details
Published in:The journal of high energy physics 2018-07, Vol.2018 (7), p.1-37, Article 129
Main Authors: Heinrich, Gudrun, Maier, Andreas, Nisius, Richard, Schlenk, Johannes, Schulze, Markus, Scyboz, Ludovic, Winter, Jan
Format: Article
Language:English
Subjects:
Classical and Quantum Gravitation
Descriptions
Elementary Particles
High energy physics
Leptons
Mathematical analysis
NLO Computations
Offsets
Pair production
Physics
Physics and Astronomy
QCD Phenomenology
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Quarks
Regular Article - Theoretical Physics
Relativity Theory
Scientists
String Theory
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Summary:A bstract We study the impact of different theoretical descriptions of top quark pair production on top quark mass measurements in the di-lepton channel. To this aim, the full NLO corrections to pp → W + W − b b ¯ → e + ν e μ − ν ¯ μ b b ¯ production are compared to calculations in the narrow width approximation, where the production of a top quark pair is calculated at NLO and combined with three different descriptions of the top quark decay: leading order, next-to-leading order and via a parton shower. The different theory predictions then enter the calibration of template fit functions, which are used for a fit to pseudo-data. The offsets in the top quark mass resulting from the fits based on the various theoretical descriptions are determined.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP07(2018)129