Würzburg 2018 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 3: Higgs I
T 3.8: Vortrag
Montag, 19. März 2018, 17:45–18:00, Philo-HS3
Optimizing the measurement of the signal strength for Higgs-boson production in the H → ττ → 2ℓ 4ν decay using multivariate techniques at √s = 13 TeV with the ATLAS detector — •Benjamin Rottler1, Markus Schumacher1, and Duc Bao Ta2 — 1Albert-Ludwigs-Universität Freiburg — 2Johannes Gutenberg-Universität Mainz
The analysis of the decay of the Higgs boson to τ-leptons allows the determination of the τ-lepton Yukawa coupling as well as the coupling strength and structure of the Higgs boson to weak gauge bosons and gluons. Both the ATLAS and CMS experiment observed individually evidence for the Higgs to τ-lepton decay in Run-1. In Run-2 a higher sensitivity of this decay is expected due to the larger integrated luminosity and the enhanced cross-section at √s=13 TeV.
The selection for Run-2 can be optimized to the new run conditions and reconstruction tools with the help of multivariate analysis (MVA) techniques by maximizing the expected significance. In this talk an approach based on boosted decision trees (BDTs) is developed to increase the sensitivity of the H → ττ → 2ℓ 4ν channel for the full 2015 and 2016 Run-2 datasets corresponding to an integrated luminosity of 36.1 fb−1 at a center-of-mass energy of √s=13 TeV. The choice of the BDT hyperparameters and collection of input variables used in the BDTs are optimized using a k-fold cross-validation method.