Feasibility study of CP violation in τ-→KSπ-vτ decays at the Super Tau Charm Facility

• 作者: Haoyu Sang Xiaodong Shi Xiaorong Zhou Xianwei Kang Jianbei Liu
• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: PARTICLES AND FIELDS
• 页码范围: 29-38
• 页数: 10页
• 语种: 英文
• DOI: 10.1088/1674-1137/abeb07

摘要

We report a feasibility study for violation in τ-→ KSπ-vτ decays at a Super Tau Charm Facility (STCF).With an expected luminosity of 1 ab-1 collected by STCF per year at a center-of-mass energy of 4.26 GeV,the statistical sensitivity for CP violation is determined to be of order 9.7 × 10-4 by measuring the decay-rate difference between τ+ → KSπ+-vτ and τ-→ KSπ-vτ.The analysis is performed using a reliable fast simulation software package,which can describe the detector responses properly and vary the responses flexibly for further optimization.Moreover,the energy-dependent efficiencies for reconstructing τ-→ KSπ-vτ are presented.The expected CP sensitivity is proportional to 1/√(￡) in the energy region from 4.0 to 5.0 GeV.The sensitivity of CP violation is of order 3.1 × 10-4 with 10 ab-1 integrated luminosity,which is equivalent to ten years' data taking in this energy region at STCF.