Pion radiative decays of excited hidden-charm pentaquark molecules: from Σc(*)D̅(*)(2S) molecules to the reported Pc states
Abstract
The discovery of the hidden-charm pentaquarks Pc(4312), Pc(4440) and Pc(4457) by the LHCb Collaboration are very likely to identify as the Σc(*)D̅(*) molecules. A natural and crucial extension is the existence of excited molecular partners built from a ground-state charmed baryon and a radially excited anti-charmed meson, namely Σc(*)D̅(*)(2S) molecules. In a framework of chiral quark model, we systematic study pion-emission decays of such excited molecules into the known ground-state Pc molecules. Our results show that the decay widths are sensitive to the spin structures and the coupled-channel interferences, i.e., the ΣcD̅(2S)/ΣcD̅*(2S)/Σc*D̅*(2S)[1/2(1/2-)] state decays to Pc(4440) with a width of several MeV, while the width to Pc(4457) is suppressed below 0.3 MeV due to destructive interference. The pion-emission decay can be the key to unveiling the excited molecular spectrum of hidden-charm pentaquarks and provides decisive experimental signatures. We expect the future experiments such as the LHCb and PANDA can verify our predictions.
Related
- Two-body strong decays of the Pcs(4338) as a hidden-charm pentaquark state via the QCD sum rules
- Analysis of the two-body strong decays of the hidden-charm pentaquark states in QCD sum rules
- Radiative and Dalitz decays of Υ(1S) in the light of the ATOMKI X17 anomaly
- Long-Distance Contributions to Light Vector Mesons and Radiative Decays of ηc
- Next-to-leading order QCD corrections to fully charm tetraquark radiative decays
BibTeX
@misc{tang2026pion,
title = {{Pion radiative decays of excited hidden-charm pentaquark molecules: from $Σ_c^(*)\barD^(*)(2S)$ molecules to the reported $P_c$ states}},
author = {Yu-Jie Tang and Wen-Yan Peng and Rui Chen and Fu-Lai Wang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2606.15619},
eprint = {2606.15619},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.15619},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Pion radiative decays of excited hidden-charm pentaquark molecules: from Σ_c^(*)D̅^(*)(2S) molecules to the reported P_c states
AU - Yu-Jie Tang
AU - Wen-Yan Peng
AU - Rui Chen
AU - Fu-Lai Wang
PY - 2026
DA - 2026/09/02
PB - arXiv
DO - 10.48550/arxiv.2606.15619
UR - https://arxiv.org/abs/2606.15619
AB - The discovery of the hidden-charm pentaquarks P_c(4312), P_c(4440) and P_c(4457) by the LHCb Collaboration are very likely to identify as the Σ_c^(*)D̅^(*) molecules. A natural and crucial extension is the existence of excited molecular partners built from a ground-state charmed baryon and a radially excited anti-charmed meson, namely Σ_c^(*)D̅^(*)(2S) molecules. In a framework of chiral quark model, we systematic study pion-emission decays of such excited molecules into the known ground-state P_c molecules. Our results show that the decay widths are sensitive to the spin structures and the coupled-channel interferences, i.e., the Σ_cD̅(2S)/Σ_cD̅^*(2S)/Σ_c^*D̅^*(2S)[1/2(1/2^-)] state decays to P_c(4440) with a width of several MeV, while the width to P_c(4457) is suppressed below 0.3 MeV due to destructive interference. The pion-emission decay can be the key to unveiling the excited molecular spectrum of hidden-charm pentaquarks and provides decisive experimental signatures. We expect the future experiments such as the LHCb and PANDA can verify our predictions.
ER -