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Photoproduction of doubly charmed tetraquark Tcc via photon-gluon fusion at ILC and CLIC

Juan-Juan Niu* and Hong-Hao Ma†

  • *Contact author: niujj@gxnu.edu.cn
  • †Contact author: mahonghao@pku.edu.cn
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Phys. Rev. D 112, 054002 – Published 2 September, 2025

DOI: https://doi.org/10.1103/7qf8-77kl

Abstract

The photoproduction of doubly charmed tetraquark Tcc is predicted through the resolved channel γ+g→⟨cc⟩[n]+c¯+c¯→Tcc+c¯+c¯ at ILC and CLIC. At e+e− colliders, the initial photons γ can be produced from two primary sources, well-delineated within the Weizäcker Williams approximation (WWA) and the laser backscattering (LBS). And the initial gluon can be emitted from the photon. The spin and color quantum number [n] of the intermediate diquark configuration can be ⟨cc⟩[S31]3¯. Then its nonperturbative hadronization to Tcc was discussed in the phenomenological potential models. Finally, the differential distributions and theoretical uncertainty of the doubly charmed tetraquark Tcc were analyzed. As the collision energy increases, the contribution of the resolved photon channel will become increasingly significant, and it may even dominate the production of Tcc with the laser backscattering spectrum. The conclusion is that it is promising to observe Tcc via the resolved channel of photoproduction both at the ILC and CLIC, and the results have a strong dependence on the mass of constituent charm quark mc and the potential model.

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Phys. Rev. D 112, 054002– Published 2 September, 2025
  • Received 29 June 2025
  • Accepted 11 August 2025
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