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Production mechanism of doubly charmed exotic mesons Tcc

Hee-Jin Kim1 and Hyun-Chul Kim1,2,3

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Phys. Rev. D 112, 094025 – Published 14 November, 2025

DOI: https://doi.org/10.1103/5v1l-bqfw

Abstract

We investigate the production mechanism for doubly charmed tetraquark mesons within a coupled-channel formalism. The two-body Feynman kernel amplitudes are constructed using effective Lagrangians that respect heavy quark symmetry, chiral symmetry, SU(3) flavor symmetry, and hidden local symmetry. The fully off-shell coupled scattering equations are solved within the Blankenbecler-Sugar reduction scheme. We find three positive-parity and one negative-parity tetraquark states with total spin J=1. Among them, two positive-parity states appear as bound states in the isoscalar and isovector DD* channels, while another appears as a resonance in the D*D* channel. A negative-parity resonance is also predicted in the isoscalar channel. We analyze the coupling strengths of these tetraquark states to various channels. The dependence of the results on the reduced cutoff mass Λ0 is examined. The most significant tetraquark state remains stable within the range of Λ0=(600–700)  MeV.

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Phys. Rev. D 112, 094025– Published 14 November, 2025
  • Received 16 July 2025
  • Accepted 27 October 2025
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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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