Search for Invisible Decays of Sub-GeV Dark Photons in Missing-Energy Events at the CERN SPS

D. Banerjee, V. Burtsev, D. Cooke, P. Crivelli, E. Depero, A. V. Dermenev, S. V. Donskov, F. Dubinin, R. R. Dusaev, S. Emmenegger, A. Fabich, V. N. Frolov, A. Gardikiotis, S. N. Gninenko, M. Hösgen, V. A. Kachanov, A. E. Karneyeu, B. Ketzer, D. V. Kirpichnikov, M. M. KirsanovS. G. Kovalenko, V. A. Kramarenko, L. V. Kravchuk, N. V. Krasnikov, S. V. Kuleshov, V. E. Lyubovitskij, V. Lysan, V. A. Matveev, Yu V. Mikhailov, V. V. Myalkovskiy, V. D. Peshekhonov, D. V. Peshekhonov, O. Petuhov, V. A. Polyakov, B. Radics, A. Rubbia, V. D. Samoylenko, V. O. Tikhomirov, D. A. Tlisov, A. N. Toropin, Adrey Yurievich Trifonov, Bogdan Ivanovich Vasilishin, G. Vasquez Arenas, P. Ulloa, V. K. Zhukov, K. Zioutas, NA64 Collaboration

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Abstract

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.

Original languageEnglish
Article number011802
JournalPhysical Review Letters
Volume118
Issue number1
DOIs
Publication statusPublished - 5 Jan 2017

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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., ... NA64 Collaboration (2017). Search for Invisible Decays of Sub-GeV Dark Photons in Missing-Energy Events at the CERN SPS. Physical Review Letters, 118(1), [011802]. https://doi.org/10.1103/PhysRevLett.118.011802