Revealing the nature of double-strangeness pentaquark states via femtoscopic correlation functions

A new arXiv preprint argues that femtoscopic correlation functions could offer a way to probe the internal dynamics of two double-strangeness pentaquark candidates, Pcss(4493) and Pcss(4633).

Posted on June 15, 2026, the paper by Zheng-Ting Lai, Jun-Xu Lu, Zhi-Wei Liu, A. Martinez Torres, K. P. Khemchandani and Li-Sheng Geng focuses on whether these states behave like bound systems and how coupled-channel effects shape their interactions.

What the paper says

The authors study the candidates with spin-parity assignments that include J^P = 1/2^- for Pcss(4493) and J^P = 1/2^- or 3/2^- for Pcss(4633). In their analysis, femtoscopy is used as a probe of the short-range interaction between hadrons produced close together.

They report clear signatures of attractive interactions and say the pattern is consistent with bound-state behavior. They also find that the results change markedly when off-diagonal transitions are ignored, which they treat as evidence that coupled-channel dynamics matter for understanding these systems.

Why it matters

If the proposed signal can be measured experimentally, femtoscopic correlation functions could become another tool for separating molecular-like interpretations of exotic hadrons from more compact alternatives.

That matters because the internal structure of strange pentaquarks remains unsettled. The classification of these states affects how physicists interpret the growing family of exotic hadrons seen near threshold.

Background

The new paper builds on earlier work from the LHCb collaboration, which reported a strange pentaquark candidate, P_psi s^Lambda(4338)^0, in B- -> J/psi Lambda pbar decays in 2022. That measurement helped keep strange pentaquarks on the research agenda and added momentum to theory studies of related systems.

The same research group has also been using femtoscopy in recent studies of exotic hadrons, including work on P_psi s^Lambda(4338) and Pc states.

What comes next

The result is still theoretical: it is a preprint, not an experimental observation. The next steps would be independent theory checks, a journal version with more numerical detail, and eventual experimental studies to see whether the predicted correlation patterns can actually be measured.