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DD* correlation functions in deciphering the nature of Tcc(3875)+

Duo-Lun Ge1, Zhi-Wei Liu2,3,*, and Li-Sheng Geng1,4,5,6,†

  • 1School of Physics, Beihang University, Beijing 102206, China
  • 2Institute for Advanced Study in Nuclear Energy and Safety, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
  • 3Shenzhen Key Laboratory of Nuclear and Radiation Safety, Shenzhen 518060, China
  • 4Sino-French Carbon Neutrality Research Center, École Centrale de Pékin/School of General Engineering, Beihang University, Beijing 100191, China
  • 5Peng Huanwu Collaborative Center for Research and Education, Beihang University, Beijing 100191, China
  • 6Southern Center for Nuclear-Science Theory (SCNT), Institute of Modern Physics, Chinese Academy of Sciences, Huizhou 516000, China

  • *Contact author: liuzhw@szu.edu.cn
  • †Contact author: lisheng.geng@buaa.edu.cn
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Phys. Rev. D 114, 014054 – Published 28 July, 2026

DOI: https://doi.org/10.1103/xgks-ft1w

Abstract

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 [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.

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Phys. Rev. D 114, 014054– Published 28 July, 2026
  • Received 3 April 2026
  • Accepted 1 July 2026
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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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