Search for invisible decays of the Higgs boson produced at the CEPC

• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2020,（12）
• 所属期刊栏目: PARTICLES AND FIELDS
• 页码范围: 1-8
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1137/abb4d8

摘要

The Circular Electron Positron Collider (CEPC),proposed as a future Higgs boson factory,will operate at a center-of-mass energy of 240 GeV and will accumulate 5.6 ab-1 of integrated luminosity in 7 years.In this study,we estimate the upper limit of BR(H → inv) for three independent channels,including two leptonic channels and one hadronic channel,at the CEPC.Based on the full simulation analysis,the upper limit of BR(H → inv) could reach 0.26％ at the 95％ confidence level.In the Stand Model (SM),the Higgs boson can only decay invisibly via H → ZZ* → v(v)v(v),so any evidence of invisible Higgs decays that exceed BR(H → inv) of the SM will indicate a phe-nomenon that is beyond the SM (BSM).The invariant mass resolution of the visible hadronic decay system ZH(Z → qq,H → inv) is simulated,and the physics requirement at the CEPC detector for reaching this is given.