Erlangen 2026 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 15: Searches/BSM I
T 15.6: Vortrag
Montag, 16. März 2026, 17:30–17:45, KH 02.018
Search for long-lived dark scalars at the LHCb experiment — •Penelope Hoffmann and Christoph Langenbruch — Physikalisches Institut, Universität Heidelberg, Germany
In the minimal dark scalar portal model, a potential dark scalar sector is expected to couple to the Standard Model Higgs boson, with a dark scalar particle acting as a mediator for dark matter. At LHC energies, flavour-changing neutral current decays of K and B mesons are excellent probes for dark scalar particles in the MeV/c2 to GeV/c2 mass region.
This talk presents a search for a dark sector scalar particle χ, produced via the decay B0→ K*0χ(→µµ), in data recorded in late 2025 with the LHCb detector. Tracks from final state particles originating from long-lived scalar particles that decay outside the LHCb vertex detector (VELO) are reconstructed using only information from the LHCb upstream tracker (UT) and the downstream tracking system (SciFi). These tracks are referred to as downstream tracks.
Employing an improved downstream track reconstruction and a new dedicated trigger line, the preliminary expected limit presented in this talk showcases the promising potential of using downstream tracks in the search for a dark scalar particle at LHCb.
Keywords: LHCb; Dark Scalars; Long-Lived Particles