Understanding near-threshold strong interactions is essential for disentangling hadronic molecules and compact multiquark states in heavy-flavor spectroscopy. In this context, the doubly charmed tetraquark candidate Tcc(3875)+ serves as a critical benchmark because it lies very close to the D∗-D thresholds. Motivated by the interaction ambiguity reported recently [\href{https://doi.org/10.1103/kd4s-9rzr}{Phys.Rev.D 113, L031505 (2026)}], we evaluate the D∗-D scattering lengths and femtoscopic correlation functions for the molecular and molecule-compact admixture assignments of the Tcc(3875)+. We show that, although these scenarios yield similar invariant-mass line shapes, their corresponding femtoscopic correlation functions differ markedly and remain clearly distinguishable for typical particle-emitting sources created at the LHC. Our results indicate that femtoscopy can serve as a sensitive and complementary probe of the near-threshold dynamics of Tcc(3875)+, providing vital theoretical references for future LHC femtoscopy measurements.
@article{arxiv.2603.24980,
title = {$DD^*$ correlation functions in deciphering the nature of $T_{cc}(3875)^+$},
author = {Duo-Lun Ge and Zhi-Wei Liu and Li-Sheng Geng},
journal= {arXiv preprint arXiv:2603.24980},
year = {2026}
}