The dark photon A^{'} and the dark Higgs boson h^{'} are hypothetical particles predicted in many dark sector models. We search for the simultaneous production of A^{'} and h^{'} in the dark Higgsstrahlung process e^{+}e^{-}→A^{'}h^{'} with A^{'}→μ^{+}μ^{-} and h^{'} invisible in electron-positron collisions at a center-of-mass energy of 10.58 GeV in data collected by the Belle II experiment in 2019. With an integrated luminosity of 8.34  fb^{-1}, we observe no evidence for signal. We obtain exclusion limits at 90% Bayesian credibility in the range of 1.7-5.0 fb on the cross section and in the range of 1.7×10^{-8}-200×10^{-8} on the effective coupling ϵ^{2}×α_{D} for the A^{'} mass in the range of 4.0  GeV/c^{2}<9.7  GeV/c^{2} and for the h^{'} mass M_{h^{'}}

Search for a Dark Photon and an Invisible Dark Higgs Boson in μ+μ− and Missing Energy Final States with the Belle II Experiment / Abudinén, F., Adachi, I., Aggarwal, L., Aihara, H., Akopov, N., Aloisio, A., Anh Ky, N., Asner, D. M., Atmacan, H., Aushev, T., Aushev, V., Babu, V., Bahinipati, S., Bambade, P., Banerjee, Sw., Bansal, S., Baudot, J., Baur, A., Beaubien, A., Becker, J., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 130/2023:7(2023), pp. 071804."-"-071804."-". [10.1103/PhysRevLett.130.071804]

Search for a Dark Photon and an Invisible Dark Higgs Boson in μ+μ− and Missing Energy Final States with the Belle II Experiment

Ganiev, E.;Manfredi, R.;Raiz, S.;Vitale, L.;
2023-01-01

Abstract

The dark photon A^{'} and the dark Higgs boson h^{'} are hypothetical particles predicted in many dark sector models. We search for the simultaneous production of A^{'} and h^{'} in the dark Higgsstrahlung process e^{+}e^{-}→A^{'}h^{'} with A^{'}→μ^{+}μ^{-} and h^{'} invisible in electron-positron collisions at a center-of-mass energy of 10.58 GeV in data collected by the Belle II experiment in 2019. With an integrated luminosity of 8.34  fb^{-1}, we observe no evidence for signal. We obtain exclusion limits at 90% Bayesian credibility in the range of 1.7-5.0 fb on the cross section and in the range of 1.7×10^{-8}-200×10^{-8} on the effective coupling ϵ^{2}×α_{D} for the A^{'} mass in the range of 4.0  GeV/c^{2}<9.7  GeV/c^{2} and for the h^{'} mass M_{h^{'}}
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3068420
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