Effects of color reconnection on t(t)over-bar final states at the LHC

Research output: Contribution to journalArticle

Abstract

The modeling of color reconnection has become one of the dominant sources of systematic uncertainty in the top mass determination at hadron colliders. The uncertainty on the top mass due to color reconnection is conventionally estimated by taking the difference in the predictions of a model with and a model without color reconnection. We show that this procedure underestimates the uncertainty when applied to the existing models in PYTHIA 8. We introduce two new classes of color reconnection models, each containing several variants, which encompass a variety of scenarios that could be realized in nature and we study how they affect the reconstruction of the top mass. After tuning the new models to existing LHC data, the remaining spread of predictions is used to derive a more realistic uncertainty for the top mass, which is found to be around 500 MeV. We also propose how future LHC measurements with t (t) over bar events can be used to further constrain these models and reduce the associated modeling uncertainty.

Details

Authors
Organisations
External organisations
  • German Electron Synchrotron (DESY)
  • Lunds universitet, Naturvetenskapliga fakulteten
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics

Keywords

  • QCD Phenomenology, Monte Carlo Simulations
Original languageEnglish
Article number043
JournalJournal of High Energy Physics
Issue number11
Publication statusPublished - 2014
Publication categoryResearch
Peer-reviewedYes