Photoproduction of doubly charmed tetraquark $T_{cc}$ via photon-gluon fusion at ILC and CLIC

The photoproduction of doubly charmed tetraquark $T_{cc}$ is predicted through the resolved channel $\gamma +g\to \to ⟨cc⟩[n]+\bar{c}+\bar{c}\to T_{cc}+\bar{c}+\bar{c}$ at ILC and CLIC. At $e^{+}{e}^{-}$ colliders, the initial photons $\gamma$ can be produced from two primary sources, well-delineated within the $Weiz\ddot{a}cker$ Williams approximation (WWA) and the laser back-scattering (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 $⟨cc⟩{[}^3{S}_1{]}_{\bar{3}}$. Then its nonperturbative hadronization to $T_{cc}$ was discussed in the phenomenological potential models. Finally, the differential distributions and theoretical uncertainty of the doubly charmed tetraquark $T_{cc}$ were analyzed. The conclusion is that it is promising to observe $T_{cc}$ 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 $m_c$ and the potential model.