Production of the Bc meson at the CEPC

• Published in: The European physical journal. C, Particles and fields Particles and fields, 2022-03, Vol.82 (3)
• Main Authors: Zhang, Ze-Yang, Zheng, Xu-Chang, Wu, Xing-Gang
• Format: Article
• Language: English
• Subjects: Astronomy; Astrophysics and Cosmology; Cross-sections; Elementary Particles; Hadrons; Heavy Ions; Measurement Science and Instrumentation; Mesons; Nuclear Energy; Nuclear Physics; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Regular Article - Theoretical Physics; String Theory
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-022-10212-4

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 × 10 8 B c events to be accumulated via the Z mode ( s = m Z ) of the CEPC, but only about 1.6 × 10 4 and 1.1 × 10 4 B c events to be accumulated via the W ( s = 160 GeV ) and H ( 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 σ / ( d z d cos θ ) and d σ / d z via the Z mode of the CEPC.