IFIC Seminar: Probing the top quark mass using tt+jet production at the LHC

by Sebastian Wuchterl (CERN)

Tuesday 19 Sep 2023, 12:00 → 14:00 Europe/Madrid

1001-Primera-1-1-1 - Paterna. Seminario (Universe)

The top quark is the most massive elementary particle known. Its mass is a fundamental parameter of the standard model, and its value needs to be determined experimentally. From the theoretical point of view, the top quark mass cannot be defined uniquely, while experimentally, the usage of multi-purpose event generators complicates the interpretation of the results of direct top mass measurements. The attempt to shed light on this issue led to the development of complementary theoretical and experimental techniques to measure this parameter.
Currently, the most precise measurements of the top quark mass are achieved at the Large Hadron Collider (LHC) in proton-proton collisions by the ATLAS and CMS collaborations.
Processes like top quark-antiquark pair production can be used, for instance, to extract its value in different renormalization schemes or directly measure it by reconstruction of the final state particles.
In this seminar, I will present recent measurements of the top quark mass using events where the top quark-antiquark pair is produced in association with at least one additional jet.
I will highlight experimental advancements and prospects using machine-learning-based methods for event reconstruction explored at the LHC.
Recent developments in the theoretical predictions with implications on the experimental measurements are also discussed.
 

Wuchterl_ttjet.pdf