We study the expected sensitivity to measure the branching ratio of Higgs boson decays to invisible particles at a future circular e + e - collider (FCC-ee) in the process e + e - → HZ with Z→ ℓ + ℓ - (ℓ= e or μ) using an integrated luminosity of 3.5 ab - 1 at a center-of-mass energy s=240 GeV. The impact of the energy spread of the FCC-ee beam and of the resolution in the reconstruction of the leptons is discussed. The minimum branching ratio for a 5 σ observation after 3.5 ab - 1 of data taking is 1.7 ± 0.1 % (stat+ syst). The branching ratio exclusion limit at 95% CL is 0.63 ± 0.22 % ((stat+ syst)).
Study the effect of beam energy spread and detector resolution on the search for Higgs boson decays to invisible particles at a future e + e - circular collider
Cerri, Olmo;PIERINI, Maurizio;Podo, Alessandro;Rolandi, Luigi
2017
Abstract
We study the expected sensitivity to measure the branching ratio of Higgs boson decays to invisible particles at a future circular e + e - collider (FCC-ee) in the process e + e - → HZ with Z→ ℓ + ℓ - (ℓ= e or μ) using an integrated luminosity of 3.5 ab - 1 at a center-of-mass energy s=240 GeV. The impact of the energy spread of the FCC-ee beam and of the resolution in the reconstruction of the leptons is discussed. The minimum branching ratio for a 5 σ observation after 3.5 ab - 1 of data taking is 1.7 ± 0.1 % (stat+ syst). The branching ratio exclusion limit at 95% CL is 0.63 ± 0.22 % ((stat+ syst)).File in questo prodotto:
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