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T: Fachverband Teilchenphysik

T 51: Flavour Physics III

T 51.5: Vortrag

Mittwoch, 18. März 2026, 17:15–17:30, KH 01.011

Lineshape study of the χ_c1(3872) state with LHCb — •Robert Hentges¹, Mikhail Mikhasenko¹, Vanya Belyaev², and Matthew Needham³ — ¹Ruhr-University Bochum — ²Sapienza Universita e INFN, Roma — ³University of Edinburgh

After its dicovery in 2003, the χ_c1(3872) state, also known as X(3872), has been established as an exotic hadron. However, its exact nature as meson-anti-meson molecule, compact tetraquark, conventional charmonium or a mixture thereof is still being investigated. Using the full LHCb Run 1&2 data set of the inclusive b → (X(3872) → J/ψ π⁺π⁻)+Any and exclusive B⁺ → (X(3872) → J/ψ π⁺π⁻) K⁺ decays, this analysis probes different lineshapes in their ability to describe the recorded data. The probed lineshapes arise from diverse theoretical models, taking into account the proximity of the χ_c1(3872) state to the D⁰D^*0 threshold. From these lineshapes, this analysis aims at precise determination of the physical parameters mass m and width Γ, as well as the scattering parameters. Especially knowledge of its position relative to the D⁰D^*0 threshold is required to advance our understanding of the state. Thus, a special focus is set on the systematic uncertainty stemming from background interference.

Keywords: Charmonium; Exotic hadrons; Tetraquark; Lineshape Analysis; Background interference