SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 30: Higgs Charm, Di-Higgs

T 30.1: Vortrag

Dienstag, 21. März 2023, 17:00–17:15, HSZ/0105

Direct search for Higgs boson decay to a pair of charm quarks in the vector boson associated production mode at CMS — •Annika Stein¹, Bjorn Burkle², Xavier Coubez^1,2, Alena Dodonova¹, Manuella Guirgues¹, Luca Mastrolorenzo¹, Ming-Yan Lee¹, Spandan Mondal¹, Andrzej Novak¹, Andrey Pozdnyakov¹, Alexander Schmidt¹, and Valentyn Vaulin¹ — ¹III. Physikalisches Institut A, RWTH Aachen University, Aachen, Germany — ²Brown University, Providence, USA

The search targets Higgs bosons produced in association with a vector boson (W, Z) and probes the coupling of the Higgs boson to charm quarks via the H → cc decay, using full Run-2 data of the CMS experiment. Two topologies contribute to the full analysis, the "boosted" topology, where the two jets from a Higgs boson candidate are merged into one large-radius jet, and a "resolved" topology which utilizes two reconstructed small-radius jets. Compared to a previous search, the analysis techniques have been improved by exploiting a DNN-based charm jet tagging algorithm along with a new calibration method, improved jet-energy regression, and a "kinematic fit" to constrain momenta of the jets using leptons. The most stringent constraint on the Higgs-charm Yukawa coupling modifier, κ_c, at the observed (expected) 95% CL interval is set to 1.1 <|κ_c|< 5.5 (|κ_c|< 3.4). A validation of the analysis is carried out with a search for Z → cc in VZ events, which leads to its first observation at a hadron collider with a significance of 5.7 standard deviations. Further developments that feature novel machine learning methods will be discussed.