Open Access

Electromagnetic probes revealing the inner structure of the $Λ_{c} (2940)$

Ping Chen^*, Zi-Le Zhang^†, and Yu Zhuge^‡

School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China; Research Center for Hadron and CSR Physics, Lanzhou University and Institute of Modern Physics of CAS, Lanzhou 730000, China; and Lanzhou Center for Theoretical Physics, Key Laboratory of Theoretical Physics of Gansu Province, Gansu Provincial Research Center for Basic Disciplines of Quantum Physics, Key Laboratory of Quantum Theory and Applications of MoE, and MoE Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, China

^*Contact author: chenp21@lzu.edu.cn
^†Contact author: zhangzl2023@lzu.edu.cn
^‡Contact author: 220220940231@lzu.edu.cn

Phys. Rev. D 112, 056019 – Published 16 September, 2025

DOI: https://doi.org/10.1103/tcnp-2hc5

Abstract

The $Λ_{c} (2940)$ , an open-charm baryon discovered in 2006, has sparked interest due to its “low mass puzzle,” paralleling the $X (3872)$ in the charmoniumlike sector. Both states challenge conventional hadronic interpretations, with the $X (3872)$ understood as a $D^{*} \bar{D}$ molecular state and the $Λ_{c} (2940)$ hypothesized as a $D^{*} N$ molecular state. This work investigates the radiative decay modes $Λ_{c} (2940) \to Λ_{c} (2286) γ$ , $Λ_{c} (2940) \to Λ_{c} (2595) γ$ , and $Λ_{c} (2940) \to Λ_{c} (2765) γ$ , analogous to radiative transitions observed in the $X (3872)$ . Using the one-boson-exchange model to obtain the $D^{*} N$ molecular spatial wave function as input, we calculate decay widths and their ratios, finding differences with different quantum number assumptions. Our findings underscore the potential of electromagnetic probes in revealing its nature and highlight the need for dedicated experimental studies to validate these theoretical predictions.

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Phys. Rev. D 112, 056019– Published 16 September, 2025

Vol. 112, Iss. 5 — 1 September 2025

Received 22 June 2025
Accepted 26 August 2025

DOI: https://doi.org/10.1103/tcnp-2hc5

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Electromagnetic probes revealing the inner structure of the $Λ_{c} (2940)$

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Electromagnetic probes revealing the inner structure of the Λc(2940)

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Electromagnetic probes revealing the inner structure of the $Λ_{c} (2940)$