NLO QCD corrections to Bc(B*c) production around the Z pole at an e+e-collider

• 来源期刊: 中国科学:物理学 力学 天文学（英文版）
• 年，卷（期）: 2018,（3）
• 页码范围: 34-46
• 页数: 13页
• 语种: 英文

摘要

The production of Bc and Bc* mesons at a Z-factory (an e+e-collider operating at energies around the Z pole) is calculated up to the next-to-leading order (NLO) QCD accuracy.The results show that the dependence of the total cross sections on the renormalization scale μ is suppressed by the corrections,and the NLO corrections enhance the total cross sections of Bc by 52％ and of Bc* by 33％ when the renormalization scale is taken at μ =2mb.To observe the various behaviors of the production of the mesons Bc and Bc*,such as the differential cross section vs.the out-going angle,the forward-backward asymmetry,and the distribution vs.the energy fraction z up to NLO QCD accuracy as well as the relevant K-factor (NLO to LO) for the production,are calculated,and it is pointed out that some of the observables obtained in the present work may be used as a specific precision test of the standard model.