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

We study the expected sensitivity to measure the branching ratio of Higgs boson decays to invisible particles at a future circular \epem collider (FCC-ee) in the process \(e^+e^-\to HZ\) with \(Z\to \ell^+\ell^-\) (\(\ell=e\) or \(\mu\)) using an integrated luminosity of 3.5 ab\(^{-1}\) at a center-...

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Bibliographic Details
Published in:arXiv.org 2017-02
Main Authors: Olmo Cerri, de Gruttola, Michele, Pierini, Maurizio, Podo, Alessandro, Rolandi, Gigi
Format: Article
Language:English
Subjects:
Higgs bosons
Leptons
Luminosity
Particle decay
Quarks
Reconstruction
Sensors
Online Access:Get full text
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Summary:We study the expected sensitivity to measure the branching ratio of Higgs boson decays to invisible particles at a future circular \epem collider (FCC-ee) in the process \(e^+e^-\to HZ\) with \(Z\to \ell^+\ell^-\) (\(\ell=e\) or \(\mu\)) using an integrated luminosity of 3.5 ab\(^{-1}\) at a center-of-mass energy \(\sqrt{s}=240\) GeV. The impact of the energy spread of the FCC-ee beam and of the resolution in the reconstruction of the leptons is discussed. %Two different detector concepts are considered: a detector corresponding to the CMS reconstruction performances and the expected design of the ILC detector. The minimum branching ratio for a \(5\sigma\) observation after 3.5ab\(^{-1}\) of data taking is \(1.7\pm 0.1\%(stat+syst) \). The branching ratio exclusion limit at 95\% CL is \(0.63 \pm 0.22\%((stat+syst))\).
ISSN:2331-8422
DOI:10.48550/arxiv.1605.00100