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Production of doubly charmed tetraquarks with exotic color configurations in electron-positron collisions
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Structure and production of doubly charmed tetraquarks T_cc (cc ubar dbar) are studied from the viewpoint of color configurations. Based on the diquark correlation, the tetraquark T_cc with I(JP)=0(1+) is considered to be stable against strong decay. We discuss that the mixing probability of color antitriplet and sextet cc components in T_cc is suppressed by 1/m_c^2, so the two configurations are separately realized in the heavy quark limit. Utilizing the nonrelativistic QCD framework, we evaluate the production cross sections of T_cc in electron-positron collisions. The momentum dependence of the cross section of color antitriplet is found to be different from that of sextet, which can be used to discriminate the color structure of the T_cc states in experimental measurements.
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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.
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