Exclusive production of Bc mesons in e+e− colliders**Supported by Natural Science Foundation of Shandong Province, China (ZR2015AQ006), National Natural Science Foundation of China (11521505, 11621131001, 11447009, 11505098, 11765012), R. H. Li is partly supported by the plan of Young Creative Talents under the Talent of the Prairie project of the Inner Mongolia

Abstract

Within the framework of the perturbative QCD approach, we calculate the time-like form factors F(Q2) and A2(Q2). We include relativistic corrections and QCD corrections, either of which can give about 20% correction to the leading-order contribution, but there are cancellation effects between them. We calculate the cross sections of the processes. The cross sections are enhanced at the Z pole to be σPP(Q = mZ) ∼ 1.3 × 10−5 pb and σPV(Q = mZ) ∼ 2.5 × 10−5pb, which are still too small to be detected by proposed e+e− colliders such as the Circular Electron Positron Collider.