Search for Invisible Decays of Sub-GeV Dark Photons in Missing-Energy Events at the CERN SPS
Journal
Physical Review Letters
Date Issued
2017-01-05
Author(s)
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.
Kramarenko, V. A.
Kravchuk, L. V.
Krasnikov, N. 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.
DOI
10.1103/PhysRevLett.118.011802
Abstract
We report on a direct search for sub-GeV dark photons (A0
), which might be produced in the reaction
e−Z → e−ZA0 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 − A0 mixing strength and exclude the invisible A0 with a
mass ≲100 MeV as an explanation of the muon gμ − 2 anomaly.
), which might be produced in the reaction
e−Z → e−ZA0 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 − A0 mixing strength and exclude the invisible A0 with a
mass ≲100 MeV as an explanation of the muon gμ − 2 anomaly.
Subjects
