Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 101: Searches/BSM VI
T 101.1: Talk
Friday, March 20, 2026, 09:00–09:15, KH 02.018
Search for X → HY production in bbττ final states at the CMS experiment — •Moritz Molch1, Ulrich Husemann2, Nikita Shadskiy1, Nicolò Trevisani1, and Roger Wolf1 — 1Institute of Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT) — 2Deutsches Elektronen-Synchrotron (DESY), Hamburg
Extensions of the Standard Model (SM), like the Next-to-Minimal Supersymmetric Standard Model (NMSSM), introduce additional Higgs bosons in addition to the SM Higgs boson H. This talk presents a search for the resonant decay of a heavier scalar particle X into a lighter resonance Y and H at the CMS experiment, using data from the LHC Run 3. The analysis considers final states, in which either the Y or the H boson decays into a pair of bottom quarks, and the other one into a pair of τ leptons. Backgrounds from jets which are misidentified as hadronic τ lepton decays (τh) pose a challenge in this search as they are difficult to model in simulation. Therefore, data-driven techniques are used to control these backgrounds. For signal extraction, a parametric deep neural network is used, which enables the treatment of all signal hypotheses with a single neural network at once. Expected upper limits on the signal cross sections times branching fractions are presented to quantify the sensitivity of this search in the parameter space spanned by the unknown masses of the X and Y bosons.
Keywords: Extended Higgs sector; BSM Higgs pair production; b quarks; tau leptons; Next-to-minimal supersymmetric standard model