Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 100: Higgs 4 (coupling to taus, CP, rare decays)
T 100.1: Talk
Thursday, March 7, 2024, 16:00–16:15, Geb. 30.41: HS 2
H→ ττ cross-section measurement in the VBF production mode with focus on the non-τ background — •Lena Herrmann, Christian Grefe, Philip Bechtle, and Klaus Desch — Physikalisches Institut, University of Bonn
Precision measurements of the Higgs boson properties are promising to show evidence of physics beyond the Standard Model. One aspect of interest is the Yukawa-interaction which can be directly investigated by a cross-section measurement in the di-τ final state.
Differential measurements in the vector-boson fusion production mode are performed in a binned maximum-likelihood fit of the di-τ mass in various pTH and mjj bins using the "Simplified Template Cross Section" framework (STXS). The main backgrounds of this analysis are, besides Z→ τ τ events, misidentified τ leptons – so called Fakes. This background has a non-negligible impact on the final sensitivity and is therefore a central topic in developing strategies to improve the measurement. Apart from introducing a more accurate reconstruction of misidentified tau leptons, effort has been made to define fake reduced signal regions and to stabilize the fit setup by decreasing statistical uncertainties on the shape of the background in question.
This presentation will discuss several studies related to the fake estimate. These include strategies applied in the current analysis as well as promising ideas for future fit setups which are already validated in preparatory studies. In addition, fit results will be presented to probe the Standard Model prediction in the vector-boson fusion production mode.
Keywords: STXS; fakes; Higgs; cross-section; tau