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T: Fachverband Teilchenphysik

T 111: Experimentelle Methoden 4 (Rekonstruktion)

T 111.8: Vortrag

Donnerstag, 30. März 2017, 18:30–18:45, JUR 253

Extrapolation of in-situ calibrations of large-radius jets to high p_T at ATLAS — •Eftychia Tzovara, Lucia Masetti, and Sabrina Groh — Institute of Physics, University of Mainz

Data-based, so called "in-situ", methods are used to correct the jet energy and mass calibrations and to determine their systematic uncertainties. A new 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 higher p_T regions is necessary.

Monte Carlo simulations can be used to extrapolate the large-radius jet forward-folding result from the phase space region where it is performed, to regions that are inaccessible to the measurement in data. However, since the extraction of the jet mass scale and resolution from a hadronic resonance requires the particle-level spectrum as input, its precision is limited by the corresponding modeling uncertainties. In this talk, methods to extrapolate large-radius jet calibrations to high p_T and to determine their uncertainties, with data collected by the ATLAS experiment at the center-of-mass energy of 13 TeV, are presented.