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

Understand

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.