A diquark fragmentation model predicts that photon-photon fusion at CEPC and ILC can produce the doubly charmed tetraquark Tcc with thousands of events per year.
Evidence for Colour-Octet Mechanism from CERN LEP2 gamma gamma -> J/psi + X Data
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We present theoretical predictions for the transverse-momentum distribution of J/psi mesons promptly produced in gamma gamma collisions within the factorization formalism of nonrelativistic quantum chromodynamics, including the contributions from both direct and resolved photons, and we perform a conservative error analysis. The fraction of J/psi mesons from decays of bottom-flavoured hadrons is estimated to be negligibly small. New data taken by the DELPHI Collaboration at LEP2 nicely confirm these predictions, while they disfavour those obtained within the traditional colour-singlet model.
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Production of doubly charmed tetraquark $T_{cc}$ via photon-photon fusion at electron-positron colliders
A diquark fragmentation model predicts that photon-photon fusion at CEPC and ILC can produce the doubly charmed tetraquark Tcc with thousands of events per year.