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

  • Banerjee D ETH Zürich, Institute for Particle Physics, CH-8093 Zürich, Switzerland.
  • Burtsev V Tomsk Polytechnic University, 634050 Tomsk, Russia.
  • Cooke D ETH Zürich, Institute for Particle Physics, CH-8093 Zürich, Switzerland.
  • Crivelli P ETH Zürich, Institute for Particle Physics, CH-8093 Zürich, Switzerland.
  • Depero E ETH Zürich, Institute for Particle Physics, CH-8093 Zürich, Switzerland.
  • Dermenev AV Institute for Nuclear Research, 117312 Moscow, Russia.
  • Donskov SV State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center 'Kurchatov Institute' (IHEP), 142281 Protvino, Russia.
  • Dubinin F P.N. Lebedev Physics Institute, Moscow, Russia, 119991 Moscow, Russia.
  • Dusaev RR Tomsk Polytechnic University, 634050 Tomsk, Russia.
  • Emmenegger S ETH Zürich, Institute for Particle Physics, CH-8093 Zürich, Switzerland.
  • Fabich A CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland.
  • Frolov VN Joint Institute for Nuclear Research, 141980 Dubna, Russia.
  • Gardikiotis A Physics Department, University of Patras, 26504 Patras, Greece.
  • Gninenko SN Institute for Nuclear Research, 117312 Moscow, Russia.
  • Hösgen M Universität Bonn, Helmholtz-Institut für Strahlen-und Kernphysik, 53115 Bonn, Germany.
  • Kachanov VA State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center 'Kurchatov Institute' (IHEP), 142281 Protvino, Russia.
  • Karneyeu AE Institute for Nuclear Research, 117312 Moscow, Russia.
  • Ketzer B Universität Bonn, Helmholtz-Institut für Strahlen-und Kernphysik, 53115 Bonn, Germany.
  • Kirpichnikov DV Institute for Nuclear Research, 117312 Moscow, Russia.
  • Kirsanov MM Institute for Nuclear Research, 117312 Moscow, Russia.
  • Kovalenko SG Universidad Técnica Federico Santa María, 2390123 Valparaíso, Chile.
  • Kramarenko VA Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia.
  • Kravchuk LV Institute for Nuclear Research, 117312 Moscow, Russia.
  • Krasnikov NV Institute for Nuclear Research, 117312 Moscow, Russia.
  • Kuleshov SV Universidad Técnica Federico Santa María, 2390123 Valparaíso, Chile.
  • Lyubovitskij VE Tomsk Polytechnic University, 634050 Tomsk, Russia.
  • Lysan V Joint Institute for Nuclear Research, 141980 Dubna, Russia.
  • Matveev VA Joint Institute for Nuclear Research, 141980 Dubna, Russia.
  • Mikhailov YV State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center 'Kurchatov Institute' (IHEP), 142281 Protvino, Russia.
  • Myalkovskiy VV Joint Institute for Nuclear Research, 141980 Dubna, Russia.
  • Peshekhonov VD Joint Institute for Nuclear Research, 141980 Dubna, Russia.
  • Peshekhonov DV Joint Institute for Nuclear Research, 141980 Dubna, Russia.
  • Petuhov O Institute for Nuclear Research, 117312 Moscow, Russia.
  • Polyakov VA State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center 'Kurchatov Institute' (IHEP), 142281 Protvino, Russia.
  • Radics B ETH Zürich, Institute for Particle Physics, CH-8093 Zürich, Switzerland.
  • Rubbia A ETH Zürich, Institute for Particle Physics, CH-8093 Zürich, Switzerland.
  • Samoylenko VD State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center 'Kurchatov Institute' (IHEP), 142281 Protvino, Russia.
  • Tikhomirov VO P.N. Lebedev Physics Institute, Moscow, Russia, 119991 Moscow, Russia.
  • Tlisov DA Institute for Nuclear Research, 117312 Moscow, Russia.
  • Toropin AN Institute for Nuclear Research, 117312 Moscow, Russia.
  • Trifonov AY Tomsk Polytechnic University, 634050 Tomsk, Russia.
  • Vasilishin B Tomsk Polytechnic University, 634050 Tomsk, Russia.
  • Vasquez Arenas G Universidad Técnica Federico Santa María, 2390123 Valparaíso, Chile.
  • Ulloa P Universidad Técnica Federico Santa María, 2390123 Valparaíso, Chile.
  • Zhukov K P.N. Lebedev Physics Institute, Moscow, Russia, 119991 Moscow, Russia.
  • Zioutas K Physics Department, University of Patras, 26504 Patras, Greece.
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  • 2017-01-21
Published in:
  • Physical review letters. - 2017
English 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 2.75×10^{9} 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 g_{μ}-2 anomaly.
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https://folia.unifr.ch/global/documents/265876
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