Production of doubly charmed tetraquarks with exotic color configurations in electron-positron collisions

Structure and production of doubly charmed tetraquarks Tcc (ccu¯d¯) are studied from the viewpoint of color configurations. Based on the diquark correlation, the tetraquark Tcc 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 Tcc is suppressed by 1/mc2, so the two configurations are separately realized in the heavy quark limit. Utilizing the nonrelativistic QCD framework, we evaluate the production cross sections of Tcc 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 Tcc states in experimental measurements.