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

TL;DR

This paper investigates the structure and production mechanisms of doubly charmed tetraquarks in electron-positron collisions, emphasizing the role of color configurations and their experimental signatures.

Contribution

It introduces a detailed analysis of color configurations in T_cc tetraquarks and evaluates their production cross sections using nonrelativistic QCD, highlighting differences in momentum dependence.

Findings

Color antitriplet and sextet configurations have distinct momentum-dependent cross sections.

The mixing probability of different color components is suppressed by 1/m_c^2.

Production cross sections can help distinguish the tetraquark's color structure experimentally.

Abstract

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.