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

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Effects of color reconnection on t(t)over-bar final states at the LHC. / Argyropoulos, Spyros; Sjöstrand, Torbjörn.

In: Journal of High Energy Physics, No. 11, 043, 2014.

Research output: Contribution to journalArticle

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TY - JOUR

T1 - Effects of color reconnection on t(t)over-bar final states at the LHC

AU - Argyropoulos, Spyros

AU - Sjöstrand, Torbjörn

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

KW - QCD Phenomenology

KW - Monte Carlo Simulations

U2 - 10.1007/JHEP11(2014)043

DO - 10.1007/JHEP11(2014)043

M3 - Article

JO - Journal of High Energy Physics

T2 - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1126-6708

IS - 11

M1 - 043

ER -