Tau Energy calibration in the ATLAS experiment

Amelia Jean BRENNAN
2014 Proceedings of The European Physical Society Conference on High Energy Physics — PoS(EPS-HEP 2013)   unpublished
We describe the energy scale calibration of hadronic τ decays and the associated uncertainty using 4.5 fb −1 of data at √ s = 8 TeV recorded in 2012 with the ATLAS detector at the LHC. The calibration is based on simulated τ decays, while the systematic uncertainty includes contributions from the single particle response measurements, pile-up and material modeling. The systematic uncertainty on the hadronic τ energy scale for p τ T > 20 GeV and |η τ | < 2.5 is found to be ≤ 3% for the hadronic
more » ... % for the hadronic decay modes with exactly one reconstructed track, and ≤ 4% for the hadronic decay modes with at least two reconstructed tracks. The systematic uncertainty is obtained with a deconvolution method, and is checked using an in-situ analysis of the visible mass of reconstructed Z boson decays into one leptonically and one hadronically decaying τ. These two methods yield results that are compatible within the calculated uncertainties.
doi:10.22323/1.180.0041 fatcat:d2v5go6xvbh7pb4oqgizz3iboe