# Probing baryon-meson dynamics with $\Lambda^0_b$ and $\Xi^0_b$ decays to three-body states at LHCb

- Institution: CERN
- Department: LHC Seminar
- Speaker: Luis Miguel Garcia Martin
- Year: 2025
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3023014)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

Decays of beauty baryons to multibody states provide a unique window to search for intermediate resonances, including exotic states such as pentaquarks.

In this seminar, we present the first observation of the $\Xi^0_b \to J/\psi \Xi^-\pi^+$ decay and the most precise measurement of the branching fraction of the $\Lambda^0_b \to J/\psi \Xi^-K^+$ decay, using 5.4~fb$^{-1}$ of $pp$ collision data at $\sqrt{s} = 13$~TeV collected by the LHCb experiment. These decay channels offer new insights into the dynamics of baryon-meson systems. In particular, the $\Lambda^0_b \to J/\psi\,\Xi^-K^+$ decay provides an ideal probe to isolate the $I = 0$ contribution in the interaction between kaons and nucleons, which is essential for understanding the structure of the $\Lambda(1405)$ resonance. We also examine the invariant mass spectra to explore possible intermediate resonant states, setting the stage for further detailed amplitude studies.

Refreshments will be served at 10h30 .

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## Lectures

1. [Probing baryon-meson dynamics with $\Lambda^0_b$ and $\Xi^0_b$ decays to three-body states at LHCb](https://invisiblenetwork.ai/learn/cern/3023014/09a9b74bbd66), 45 min (CERN's player)