The exclusive production of a fully heavy tetraquark and a photon in electron-positron collision

TL;DR

This paper calculates the production of fully heavy tetraquarks with a photon in electron-positron collisions using non-relativistic QCD, concluding such events are unlikely to be observed at current or future colliders.

Contribution

It provides the first detailed theoretical analysis of exclusive fully heavy tetraquark production in electron-positron collisions, considering different internal structures.

Findings

Production rates are extremely low at Belle II.

Production rates are extremely low at future Z factories.

Observation of such tetraquarks in these processes is unlikely.

Abstract

The exclusive production of fully heavy tetraquark ($T(bb\bar{b}\bar{b})$, $T(cc\bar{c}\bar{c})$ and $T(bc\bar{b}\bar{c})$) in association with a hard photon in electron-positron collisions is calculated within the framework of non-relativistic QCD. Both inner structures of molecule-like state and compact state with $J=0,1,2$ for the fully heavy tetraquark are discussed. We find that it is dismal to observe any fully heavy tetraquarks in either the compact configuration or the molecule-like configuration through such exclusive processes at either Belle II or future Z factories like CEPC and FCC-ee.