On the impact of off-shell contributions on the top quark mass extraction in ttj events

TL;DR

This paper compares full off-shell calculations with narrow width approximation in ttj events to assess their impact on top quark mass measurements, highlighting the significance of off-shell effects.

Contribution

It provides a systematic comparison of off-shell and on-shell calculations for ttj production, quantifying their influence on top quark mass extraction.

Findings

Off-shell contributions significantly affect differential distribution shapes.

Non-resonant effects are non-negligible in top mass measurements.

Results inform more accurate modeling for top quark mass extraction.

Abstract

In this contribution we present a systematic comparison of the full off-shell calculation for pp -> ttj in the dileptonic decay channel with a description based on the narrow width approximation. The aim of this study is to estimate the size of off-shell and non-resonant contributions to the shape of differential distributions, that will be utilized in the top quark mass extraction using the template fit method.