Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Hadron Structure and Spectroscopy V

HK 41.6: Talk

Thursday, March 13, 2025, 15:15–15:30, HS 3 Physik

Search for χ_c1(3872) → p p in B⁺ → p p K ⁺ — •Kai Habermann, Sebastian Neubert, and Jascha Grabowski — HISKP, University of Bonn, Germany

We present and analysis, that aims to measure the branching ratio of the χ_c1(3871) decaying into the ( pp ) final state using data collected by the LHCb experiment. The ultimate goal is to enable the observation and study of the χ_c1(3871) formed in pp collisions, paving the way for future experiments. The χ_c1(3871) , commonly known as X(3872) , is an enigmatic state in the charmonium spectrum, widely studied due to its unconventional properties, including its proximity to the D⁰D^*0 threshold and its debated nature as a likely exotic state such as a tetraquark or hadronic molecule. This study utilizes the B → ppK decay channel to extract the charmonium spectrum in the pp subsytem. In addition to the χ_c1(3871) , this allows for precise measurements of the mass and width of the η_c(1S) and η_c(2S) states. Furthermore, a first measurement of the branching fraction of the ψ(3770)→ p p.

Keywords: X(3872); Spectroscopy; B decays