$\alpha_sv^2$ corrections to $\eta_c$ and $\chi_{cJ}$ production recoiled with a photon at $e^+e^-$ colliders

TL;DR

This paper calculates higher-order QCD and relativistic corrections to the production of specific charmonium states recoiled with a photon at electron-positron colliders, refining cross section predictions and aiding the search for exotic states.

Contribution

It introduces $ ext{O}( ext{alpha}_s v^2)$ corrections within NRQCD to improve predictions for charmonium production at BESIII and B-factories, including potential insights into exotic $XYZ$ states.

Findings

Refined cross section calculations with higher-order corrections.

Enhanced understanding of charmonium and exotic state production.

Potential guidance for experimental searches at colliders.

Abstract

We consider the production of the $\eta_c$ and $\chi_{cJ}$ states recoiled with a photon up to $\mathcal{O}(\alpha_s v^2)$ at BESIII and B-factories within the frame of NRQCD factorization. With the corrections, we revisit the numerical calculations to the cross sections for the $\eta_c(nS)$ and the $\chi_{cJ}(mP)$ states. We argue that the search for $XYZ$ states with even charge conjugation such as $X(3872)$, $X(3940)$, $X(4160)$, and $X(4350)$ recoiled with a photon at BESIII may help clarify the nature of these states. For completeness, the production of charmonium with even charge conjugation recoiled with a photon at B factories is also discussed.