Production of the Bc meson at the CEPC

In this paper, we make a detailed study on the production of the B-c, B-c*, B-c(2(1) S-0), and B-c* (2(3) S-1) mesons via the three planned running modes (Z, W, and H) at the future Circular Electron-Positron Collider (CEPC). The fragmentation-function and full nonrelativistic QCD approaches are adopted to calculate the production cross sections. Considering the excited states shall decay to the ground B-c state (e.g. 1(1) S-0-state) with almost 100% probability, our numerical results show that up to next-to-leading order QCD corrections, there are about 1.4 x 10(8) B-c events to be accumulated via the Z mode (root s = m(z)) of the CEPC, but only about 1.6 x 10(4) and 1.1 x 10(4) B-c events to be accumulated via the W (root s = 160 GeV) and H (root s = 240 GeV) modes, respectively. Since the Z mode is the best mode among the three planned modes of the CEPC for studying the production of the B-c, B-c*, B-c (2(1) S-0), and B-c* (2(3) S-1) mesons and the differential distributions of these mesons may be measured precisely at this mode, we further present the differential cross sections d sigma /(dz dcos theta) and d sigma/dz via the Z mode of the CEPC.

Automated summary

In this study, we examine the production of B-c, B-c*, B-c(2(1) S-0), and B-c* (2(3) S-1) mesons at the future CEPC using the planned running modes (Z, W, and H). Our calculations utilize the fragmentation-function and full nonrelativistic QCD approaches to determine the production cross sections. The results show that the Z mode is the most effective mode for accumulating B-c events, and the differential cross sections d sigma /(dz dcos theta) and d sigma/dz via the Z mode are provided.