Cross Section and Higgs Mass Measurement with Higgsstrahlung at the CEPC

Abstract

The Circular Electron Positron Collider (CEPC) is a future Higgs factory proposed by the Chinese high energy physics community. It will operate at a center-of-mass energy of 240-250 GeV. The CEPC will accumulate an integrated luminosity of 5 ab${}^{-1}$ in ten years' operation, producing one million Higgs bosons via the Higgsstrahlung and vector boson fusion processes. This sample allows a percent or even sub-percent level determination of the Higgs boson couplings. With GEANT4-based full simulation and dedicated fast simulation tool, we evaluated the statistical precisions of the Higgstrahlung cross section ${\sigma }_{ZH}$ and the Higgs mass $m_H$ measurement at the CEPC in the $Z\to {\mu }^{+}{\mu }^{-}$ channel. The statistical precision of ${\sigma }_{ZH}$ ($m_H$) measurement could reach 0.97\% (6.9 MeV) in the model-independent analysis which uses only the information of Z boson decay. For the standard model Higgs boson, the $m_H$ precision could be improved to 5.4 MeV by including the information of Higgs decays. Impact of the TPC size to these measurements is investigated. In addition, we studied the prospect of measuring the Higgs boson decaying into invisible final states at the CEPC. With the standard model $ZH$ production rate, the upper limit of $\mathcal{B}(H\to inv.)$ could reach 1.2\% at 95\% confidence level.

To be published in Chinese Physics C

References in corpus (8)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Combined Measurement of the Higgs Boson Mass in $pp$ Collisions at $\sqrt{s}=7$ and 8 TeV with the ATLAS and CMS Experiments
• Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV
• Search for invisible decays of Higgs bosons in the vector boson fusion and associated ZH production modes
• Physics cross sections and event generation of $e^{+}{e}^{-}$ annihilations at the CEPC
• Measurement of the Higgs boson mass and $e^{+}{e}^{-}\to ZH$ cross section using $Z\to {\mu }^{+}{\mu }^{-}$ and $Z\to e^{+}{e}^{-}$ at the ILC
• Study of the Beamstrahlung Effects at the CEPC

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