Search for invisible decays of sub-GeV dark photons in missing-energy events at the CERN SPS

We report on a direct search for sub-GeV dark photons (A′), which might be produced in the reaction e-Z→e-ZA′ via kinetic mixing with photons by 100 GeV electrons incident on an active target in the NA64 experiment at the CERN SPS. The dark photons would decay invisibly into dark matter particles re...

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Detalles Bibliográficos
Autores principales: Banerjee, D., Burtsev, V., Cooke, D., Crivelli, P., Depero, E., Dermenev, A.V., Donskov, S.V., Dubinin, F., Dusaev, R.R., Emmenegger, S., Fabich, A., Frolov, V.N., Gardikiotis, A., Gninenko, S.N., Hösgen, M., Kachanov, V.A., Karneyeu, A.E., Ketzer, B., Kirpichnikov, D.V., Kirsanov, M.M., Kovalenko, S.G., Kramarenko, V.A., Kravchuk, L.V., Krasnikov, N.V., Kuleshov, S.V., Lyubovitskij, V.E., Lysan, V., Matveev, V.A., Mikhailov, Yu. V., Myalkovskiy, V.V., Peshekhonov, V.D., Peshekhonov, D.V., Petuhov, O., Polyakov, V.A., Radics, B., Rubbia, A., Samoylenko, V.D., Tikhomirov, V.O., Tlisov, D.A., Toropin, A.N., Trifonov, A.Yu., Vasilishin, B., Vasquez Arenas, G., Ulloa, P., Zhukov, K., Zioutas, K.
Lenguaje:eng
Publicado: 2016
Materias:
hep-ph
Particle Physics - Phenomenology
hep-ex
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.118.011802
http://cds.cern.ch/record/2223648
Descripción
Sumario:We report on a direct search for sub-GeV dark photons (A′), which might be produced in the reaction e-Z→e-ZA′ via kinetic mixing with photons by 100 GeV electrons incident on an active target in the NA64 experiment at the CERN SPS. The dark photons would decay invisibly into dark matter particles resulting in events with large missing energy. No evidence for such decays was found with 2.75×109 electrons on target. We set new limits on the γ-A′ mixing strength and exclude the invisible A′ with a mass ≲100  MeV as an explanation of the muon gμ-2 anomaly.

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