Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 45: Higgs Physics V (HH and Trilinear Coupling)
T 45.2: Vortrag
Mittwoch, 2. April 2025, 16:30–16:45, ZHG104
Fake-τ background estimation for the Atlas HH → bbττ analysis — •Philipp Rincke1, 2, Stan Lai1, and Arnaud Ferrari2 — 1II. Physikalisches Institut, Georg-August-Universität Göttingen, Deutschland — 2Department of Physics and Astronomy, Uppsala University, Sweden
The HH → bbττ analysis has the highest expected sensitivity to the Standard Model (SM) Higgs boson pair production signal based on the legacy Run 2 results. Several SM processes contribute to this final state as backgrounds. One of the most important backgrounds consists of processes where quark- and gluon-initiated jets are mis-identified as hadronically decaying τ leptons (fake-τ leptons), which are difficult to model precisely with simulations. A better description of these backgrounds can be achieved using data-driven methods, such as the Fake Factor method.
This talk will present the Fake Factor method which is under development for the Run 2 + Run 3 analysis to model the QCD multijet background in the bbττ channel. The method relies on creating a fake-τ enriched template of events by inverting the τ lepton identification criteria. This template is then re-weighted using Fake Factors derived in control regions to model the QCD multijet background in the signal region, for which the current fake-τ background and uncertainty estimates will be shown.
Keywords: Di-Higgs; Taus; Fake Backgrounds