Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 54: Higgs Physics VI

T 54.6: Vortrag

Mittwoch, 18. März 2026, 17:30–17:45, KH 01.019

Jet Matching Performance with SPANet and GN3 in the Search for Charged Higgs Bosons Decaying to a cs Final State with the ATLAS Experiment — •Johannes Klas, Tatjana Lenz, and Jochen Dingfelder — Universität Bonn

The discovery of the Higgs boson solved the mystery of particle masses. Although the Standard Model requires the existence of only one Higgs boson, an extension of the Higgs sector with at least four Higgs bosons is possible and required by many theories beyond the Standard Model, e.g. SUSY. This leads to the existence of a pair of charged Higgs bosons with the same mass and opposite electric charges. The main production mechanism is pp→ WbbH^± and the H^±→ cs decay is one of the favoured decay modes. Below the top quark mass this is realized via pp→ tt→ WbbH^±. The search targets leptonic decays of the W, resulting in a final state with at least four expected jets and one lepton. Matching these jets to the appropriate particles is a difficult task. New developments like SPANet offer improved performance in jet matching and signal/background separation. The possibility of further improvements using the GN3 flavour tagger, which is currently in development, is being investigated. This is especially relevant when considering improvements in the correct matching of the s-jet and the rejection of gluon-initiated jets.

Keywords: Charged Higgs; SPANet; BSM; ATLAS