Selected Science Opportunities for the EicC

Abstract

An electron ion collider has been proposed in China (EicC). It is anticipated that the facility would provide polarised electrons, protons and ion beams, in collisions with large centre-of-mass energy. This discussion highlights its potential to address issues that are central to understanding the emergence of mass within the Standard Model, using examples that range from the exploration of light-meson structure, through measurements of near-threshold heavy-quarkonia production, and on to studies of the spectrum of exotic hadrons. Contents

Contact interaction analysis of pion GTMDs

“…with the matrix elements 4). Evidently, the kernel is only defined after the gap equation has been solved.…”

“…It is anticipated that an electron ion collider will be operating in the USA by 2030 [1,2]; construction of a similar machine is being discussed in China [3,4]; new capabilities are expected at Conseil Européen pour la Recherche Nucléaire (CERN) [5]; and the Jefferson Laboratory (JLab) is currently operating at 12 GeV [6]. Each of these facilities has given high a e-mail: jlzhang@njnu.edu.cn b e-mail: phycui@nju.edu.cn c e-mail: jlping@njnu.edu.cn d e-mail: cdroberts@nju.edu.cn (corresponding author) priority to experiments that can yield data that may be used to draw three-dimensional (3D) images of hadrons, i.e.…”

An analysis of parton distribution functions of the pion and the kaon with the maximum entropy input

“…Especially, the kaon structure experiment is highly needed, as there are few data on the kaon structure for now. In the future, the updating and the new facilities will provide much more data in settling down the questions, such as the COM-PASS++/AMBER with the pion and kaon beams [69], JLab [70], EicC [6,60] and EIC [61] with the tagged DIS techniques.…”

“…Therefore it is impossible to determine the parameter R for the kaon with accuracy. The small-x data on the kaon structure are needed, which could be accessed with the future electronion colliders [6,60,61]. In this work, we let the parameter R to be the same for both the pion and the kaon, for they are in the same meson octet and both of the Glodstone boson nature.…”

“…Pion and kaon, as the pseudo-Goldstone bosons [1,2], are the important objects for understanding the dynamical chiral symmetry breaking. As the mass low-lying mesons, their internal structures are crucial for us to see the emergence of hadron mass from quantum chromodynamics (QCD) of strong interaction [3][4][5][6], together with the inquiring of the origin of proton mass [7][8][9][10]. Pion, as the lightest meson, plays a dominant role in mediating the nuclear force.…”