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Paper   IPM / Particles / 14676
School of Particles and Accelerator
  Title:   Constraining Higgs boson effective couplings at electron-positron colliders
1.  Hamzeh Khanpour
2.  Mojtaba Mohammadi Najafabadi
  Status:   Published
  Journal: Phys. Rev. D
  No.:  055026
  Vol.:  95
  Year:  2017
  Supported by:  IPM
We probe the dimension-six operators contributing to Higgs production in association with a Z boson at the future high luminosity electron-positron colliders. Potential constraints on dimension-six operators in the Higgs sector are determined by performing a shape analysis on the differential angular distribution of the Higgs and Z bosons decay products. The analysis is performed at the center-of-mass energies of 350 GeV and 500 GeV including a realistic detector simulation and the main sources of background processes. The 68% and 95% confidence level upper limits are obtained on the contributing anomalous couplings considering only the decay of Higgs boson into a pair of b-quarks and leptonic Z boson decay. Our results show that angular observables provide a great sensitivity to the anomalous couplings, in particular at high luminosity regime.

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