Exclusive radiative production of fully-charmed tetraquarks at B factory

We apply a novel factorization formula recently developed within NRQCD framework to analyze the exclusive production of the fully-charmed tetraquark $T_{4c}$ plus a hard photon at super B factory. For simplicity, in this work we have concentrated on the production of the $0^{++}$ and $2^{++}$ $T_{4c}$ associated with a photon. With some rough estimates about the unknown nonperturbative NRQCD matrix elements in a simplified diquark-antidiquark model, we predict the production rates of these types of exclusive production channels at $\sqrt{s}=10.58$ GeV and also assess their observation prospect at Belle 2 experiment.