分类: 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间: 2017-11-10
摘要: It is difficult to measure the WW-fusion Higgs production process (e+e− ! ¯ h) at a lepton collider with a center of mass energy of 240-250 GeV due to its small rate and the large background from the Higgsstrahlung process with an invisible Z(e+e− ! hZ, Z ! ¯ ). We construct a modified recoil mass variable, mp recoil,defined using only the 3-momentum of the reconstructed Higgs particle, and show that it can better separate the WW-fusion and Higgsstrahlung events than the original recoil mass variable mrecoil. Consequently, the mp recoil variable can be used to improve the overall precisions of the extracted Higgs couplings, in both the conventional framework and the effective-field-theory framework. We also explore the application of the mp recoil variable in the inclusive cross section measurements of the Higgsstrahlung process, while a quantitive analysis is left for future studies.