Erlangen 2026 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Hadron Structure and Spectroscopy VI

HK 30.3: Talk

Thursday, March 19, 2026, 14:45–15:00, PHIL A 401

Amplitude Analysis of the decay Λ_b⁰ → Λ_c⁺ D⁰ K⁻ — •Ellinor Eckstein, Kai Sebastian Habermann, and Sebastian Neubert — Helmholtz-Institut für Strahlen- und Kernphysik, Bonn

Understanding the internal structure of exotic hadrons remains one of the central challenges in hadron physics over the past two decades. Many of these unconventional states have been observed in decays of b-flavored hadrons, which are produced in large quantities at the LHCb experiment located at the LHC. A precise description of such decay processes requires a detailed modelling of the various resonant contributions that arise in hadronic two-body subsystems. The full decay amplitude must account for all relevant decay topologies as well as the interference between overlapping resonances.

In this talk, I will present the first amplitude analysis of the decay Λ_b⁰ → Λ_c⁺ D⁰ K⁻, observed with the LHCb experiment. The decay channel is dominated by D_s resonances in the intermediate state decaying to D⁰ K⁻ and also recieves contributions from Ξ_c resonances in the Λ_c⁺ K⁻ subsystem. Particularly interesting is the Λ_c⁺ D⁰ subsystem, because it consists of the same valence quark content as the well established pentaquark states observed in the J/ψ p system of the decay Λ_b⁰ → J/ψ p K⁻. Studying the possible coupling of these pentaquark states to the Λ_c⁺ D⁰ system offers a new avenue to probe their internal structure and gain deeper insight into the nature of exotic hadrons.