Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 13: Higgs Physics II

T 13.1: Vortrag

Montag, 16. März 2026, 16:15–16:30, KH 02.013

Search for light pseudoscalar Higgs boson decays in the flavour-asymmetric µ⁺ µ⁻ cc final state with the CMS detector — Kai Fabian Adamowicz, Danyer Perez Adan, Lutz Feld, Philipp Nattland, and •Keitlin Sejdarasi — 1. Physikalisches Institut B, RWTH Aachen

A search for exotic decays of the Standard Model (SM) Higgs boson into pairs of light pseudoscalar Higgs bosons a decaying in the flavour-asymmetric final state a → µ⁺ µ⁻ and a → cc is presented. This channel exploits both the clean experimental signature provided by the excellent detector resolution for muons and the large branching fraction of the pseudoscalar decay into charm quarks, as predicted by the two-Higgs-doublet model extended by a singlet (2HDM+S). Pseudoscalar masses in the range 4-11 GeV are probed, corresponding to a kinematic regime where they exhibit a significant Lorentz boost. The resulting, highly collimated decay products lead to a distinctive topology: the dimuon invariant mass is used as the primary discriminating observable to extract any potential signal, while in the hadronic channel, the decay to charm quarks can be reconstructed using existing charm-jet identification techniques. In this talk, results obtained using the newly acquired Run 3 CMS data from 2024, at a center-of-mass energy of 13.6 TeV, are presented, aiming at improving the sensitivity through increased statistics. In addition, the performance and suitability of newly developed charm jet identification algorithms for Run 3 are investigated in the context of this search.

Keywords: Higgs physics; Beyond Standard Model; charm jet tagging; muon; CMS detector