Production of doubly charmed tetraquark $T_{cc}$ via photon-photon fusion at electron-positron colliders

TL;DR

This paper investigates the production of the doubly charmed tetraquark $T_{cc}$ through photon-photon fusion at electron-positron colliders, analyzing diquark configurations, hadronization models, and predicting observable cross sections at future colliders.

Contribution

It introduces a phenomenological diquark fragmentation model for $T_{cc}$ production, considering different diquark states and hadronization processes, and assesses their experimental detectability.

Findings

$T_{cc}$ production cross sections are significant at CEPC and ILC.

Production is dominated by the $(cc)[^3S_1]_{ar{3}}$ diquark configuration.

Cross sections depend strongly on charm quark mass and hadronization models.

Abstract

Within a phenomenological diquark fragmentation model, we study the production of doubly charmed tetraquark $T_{cc}$ via photon-photon fusion at electron-positron colliders. The production of $T_{cc}$ is divided into two steps: the perturbative production of heavy $(cc)$-diquark and its nonperturbative hadronization. Two diquark configurations of $(cc)[^3S_1]_{\bar{3}}$ and $(cc)[^1S_0]_{6}$ are considered, and the $(cc)[^3S_1]_{\bar{3}}$ state dominates the produciotn of $T_{cc}$. We discuss two hadronization models of $(cc)[^3S_1]_{\bar{3}}$ intermediate state into the tetraquark $T_{cc}$. It is found that it is promising to observe the tetraquark $T_{cc}$ via photon-photon fusion process both at the Circular Electron Positron Collider (CEPC) and the International Linear Collider (ILC). We find that the cross sections are sensitive to constituent charm quark mass of diquark, and they also have strong dependence on the hadronization models.