Eur. Phys. J. C (2020) 80: 740
https://doi.org/10.1140/epjc/s10052-020-8276-0

Regular Article - Theoretical Physics

Prompt photoproduction within the non-relativistic QCD framework at the CEPC

¹ Institute of High Energy Physics (IHEP), Chinese Academy of Sciences (CAS), 19B Yuquan Road, Shijingshan District, Beijing, 100049, China
² University of Chinese Academy of Sciences (UCAS), Chinese Academy of Sciences (CAS), 19(A) Yuquanlu Road, Shijingshan District, Beijing, 100049, China

^* e-mail: zhanxj@ihep.ac.cn

Received: 18 May 2020
Accepted: 21 July 2020
Published online: 13 August 2020

Abstract

The prompt photoproduction within the non-relativistic QCD (NRQCD) framework at the future Circular Electron Positron Collider (CEPC) is studied, including the contributions from both direct and resolved photons. Employing different sets of long distance matrix elements, the total cross section is dominated by the color-octet channel. We present different kinematic distributions of production and the results show there will be about 50 events when the transverse momentum of is up to 20 GeV. It renders that the photoprodution at the CEPC is a well laboratory to test the NRQCD and further clarify the universality problem in NRQCD between electron positron collider and hadron collider.