Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 61: Experimentelle Methoden II

T 61.6: Talk

Wednesday, March 21, 2018, 17:45–18:00, Z6 - SR 1.013

Extrapolation of in-situ calibrations of large-radius jets to high p_T at ATLAS — •Eftychia Tzovara, Lucia Masetti, and Peter Berta — Institute of Physics, JGU Mainz, Germany

Data-based, so called "in-situ", methods are used to correct the jet energy and mass calibrations and to determine their systematic uncertainties. A very successful technique for extracting the jet mass scale and resolution, from resonance decays (e.g. W/Z, H, top) reconstructed in a single large-radius jet, is the "forward-folding" method. It is used to extract the relative difference in the jet mass response between data and simulation, by using non-parametric shapes for both the particle-level distribution and the response function, derived from the simulation. In order to use this method to set a systematic uncertainty on the jet mass scale and jet mass resolution for beyond Standard Model searches, an extrapolation to high p_T regions is necessary.

Monte Carlo (MC) simulations can be used to extrapolate the large-radius jet forward-folding results from the phase space region where it is performed (e.g. at low p_T), to regions that are inaccessible to the measurement in data. Particular attention is given to the MC modeling systematics that are expected to dominate the total uncertainty. In this talk, results from the extrapolation of the large-radius jet calibrations and their uncertainties to high p_T, at ATLAS for a center-of-mass energy of 13 TeV, are presented.