Analysis of Bc→τvτ at CEPC

• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: PARTICLES AND FIELDS
• 页码范围: 39-47
• 页数: 9页
• 语种: 英文
• DOI: 10.1088/1674-1137/abcf1f

摘要

Precise determination of the Bc → tvt branching ratio provides an advantageous opportunity for under-standing the electroweak structure of the Standard Model,measuring the CKM matrix element IVcbl,and probing new physics models.In this paper,we discuss the potential of measuring the process Bc—τvτ with r decaying leptonically at the proposed Circular Electron Positron Collider(CEPC).We conclude that during the Z pole opera-tion,the channel signal can achieve five-cr significance with～109 Z decays,and the signal strength accuracies for Bc → τvτ can reach around 1％level at the nominal CEPC Z pole statistics of one trillion Z decays,assuming the total Bc → τvτ yield is 3.6 × 106.Our theoretical analysis indicates the accuracy could provide a strong constraint on the general effective Hamiltonian for the b→ crv transition.If the total Bc yield can be determined to 0(1％)level of accuracy in the future,these results also imply |Vcb| could be measured up to 0(1％)level of accuracy.