Optimizing Higgs factories by modifying the recoil mass

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Jiayin Gu and Ying-Ying Li. Optimizing Higgs factories by modifying the recoil mass[J]. Chinese Physics C, 2018, 42(3): 033102. doi: 10.1088/1674-1137/42/3/033102
Jiayin Gu and Ying-Ying Li. Optimizing Higgs factories by modifying the recoil mass[J]. Chinese Physics C, 2018, 42(3): 033102.  doi: 10.1088/1674-1137/42/3/033102 shu
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Received: 2017-12-23
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    JG is Supported by an International Postdoctoral Exchange Fellowship Program between the Office of the National Administrative Committee of Postdoctoral Researchers of China (ONACPR) and DESY. YYL is Supported by Hong Kong PhD Fellowship (HKPFS) and the Collaborative Research Fund (CRF) (HUKST4/CRF/13G)

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Optimizing Higgs factories by modifying the recoil mass

    Corresponding author: Jiayin Gu,
    Corresponding author: Ying-Ying Li,
  • 1. DESY, Notkestraß
  • 2. Center for Future High Energy Physics, Institute of High Energy Physics, 19 B YuquanLu, Chinese Academy of Sciences, Beijing 100049, China
  • 3.  Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong S. A. R., China
Fund Project:  JG is Supported by an International Postdoctoral Exchange Fellowship Program between the Office of the National Administrative Committee of Postdoctoral Researchers of China (ONACPR) and DESY. YYL is Supported by Hong Kong PhD Fellowship (HKPFS) and the Collaborative Research Fund (CRF) (HUKST4/CRF/13G)

Abstract: It is difficult to measure the m WW-fusion Higgs production process (e+e-→ννh) at a lepton collider with a center of mass energy of 240-250GeV due to its small rate and the large background from the Higgsstrahlung process with an invisible Z (e+e-→hZ,Z→νν). We construct a modified recoil mass variable, mrecoilp, defined using only the 3-momentum of the reconstructed Higgs particle, and show that it can separate the m WW-fusion and Higgsstrahlung events better than the original recoil mass variable mrecoil. Consequently, the mrecoilp 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 mrecoilp variable in the inclusive cross section measurements of the Higgsstrahlung process, while a quantitive analysis is left for future studies.

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