Indirect production of doubly charmed tetraquark Tcc at high energy colliders

Abstract

The indirect production mechanisms of doubly charmed tetraquark Tcc through three decay channels, Higgs/Z0→⟨cc⟩3¯+c¯+c¯→Tccq¯q′¯+c¯+c¯ and W+→⟨cc⟩3¯+c¯+s¯→Tccq¯q′¯+c¯+s¯, are analyzed within the framework of nonrelativistic QCD. The intermediate ⟨cc⟩3¯ diquark cluster in color antitriplet evolves into tetraquark components via the fragmentation process by trapping two light antiquarks (q¯ and q′¯) from the vacuum. After the considered doubly charmed tetraquark components are summed, including Tccu¯u¯, Tccu¯d¯, Tccd¯d¯, Tccu¯s¯, and Tccd¯s¯, the decay widths, branching ratios, and produced events each year for the production of Tcc can be predicted at LHC and Circular Electron-Positron Collider (CEPC), respectively. The differential distributions and two main sources of theoretical uncertainty are also discussed. The results show that the produced events each year for Tcc via W+ decays is 1.80×105, nearly 2 orders of magnitude larger than that by Higgs decays (1.11×103) and Z0 decays (4.81×103) at LHC. However at CEPC, the largest contribution for the production of Tcc is through Z0 decays, about 1.63×106. There are only 4.79×10−1 and 2.03×102 Tcc events produced each year at CEPC through Higgs and W+ decay, respectively. Published by the American Physical Society 2025