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Search for Axionlike and Scalar Particles with the NA64 Experiment.
Banerjee, D; Bernhard, J; Burtsev, V E; Chumakov, A G; Cooke, D; Crivelli, P; Depero, E; Dermenev, A V; Donskov, S V; Dusaev, R R; Enik, T; Charitonidis, N; Feshchenko, A; Frolov, V N; Gardikiotis, A; Gerassimov, S G; Gninenko, S N; Hösgen, M; Jeckel, M; Kachanov, V A; Karneyeu, A E; Kekelidze, G; Ketzer, B; Kirpichnikov, D V; Kirsanov, M M; Kolosov, V N; Konorov, I V; 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; Molina Bueno, L; Peshekhonov, D V; Polyakov, V A; Radics, B; Rojas, R; Rubbia, A; Samoylenko, V D; Sieber, H; Shchukin, D; Tikhomirov, V O; Tlisova, I; Tlisov, D A; Toropin, A N; Trifonov, A Yu.
Affiliation
  • Banerjee D; CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland.
  • Bernhard J; University of Illinois at Urbana Champaign, Urbana, Illinois 61801-3080, USA.
  • Burtsev VE; CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland.
  • Chumakov AG; Joint Institute for Nuclear Research, Dubna 141980, Russia.
  • Cooke D; Tomsk State Pedagogical University, Tomsk 634061, Russia.
  • Crivelli P; UCL Departement of Physics and Astronomy, University College London, Gower St., London WC1E 6BT, United Kingdom.
  • Depero E; ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland.
  • Dermenev AV; ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland.
  • Donskov SV; Institute for Nuclear Research, Moscow 117312, Russia.
  • Dusaev RR; State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center "Kurchatov Institute" (IHEP), Protvino 142281, Russia.
  • Enik T; Tomsk Polytechnic University, Tomsk 634050, Russia.
  • Charitonidis N; Joint Institute for Nuclear Research, Dubna 141980, Russia.
  • Feshchenko A; CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland.
  • Frolov VN; Joint Institute for Nuclear Research, Dubna 141980, Russia.
  • Gardikiotis A; Joint Institute for Nuclear Research, Dubna 141980, Russia.
  • Gerassimov SG; Physics Department, University of Patras, 265 04 Patras, Greece.
  • Gninenko SN; Technische Universität München, Physik Department, Garching 85748, Germany.
  • Hösgen M; P.N. Lebedev Physical Institute, Moscow 119991, Russia.
  • Jeckel M; Institute for Nuclear Research, Moscow 117312, Russia.
  • Kachanov VA; Universität Bonn, Helmholtz-Institut für Strahlen-und Kernphysik, Bonn 53115, Germany.
  • Karneyeu AE; CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland.
  • Kekelidze G; State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center "Kurchatov Institute" (IHEP), Protvino 142281, Russia.
  • Ketzer B; Institute for Nuclear Research, Moscow 117312, Russia.
  • Kirpichnikov DV; Joint Institute for Nuclear Research, Dubna 141980, Russia.
  • Kirsanov MM; Universität Bonn, Helmholtz-Institut für Strahlen-und Kernphysik, Bonn 53115, Germany.
  • Kolosov VN; Institute for Nuclear Research, Moscow 117312, Russia.
  • Konorov IV; Institute for Nuclear Research, Moscow 117312, Russia.
  • Kovalenko SG; State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center "Kurchatov Institute" (IHEP), Protvino 142281, Russia.
  • Kramarenko VA; Technische Universität München, Physik Department, Garching 85748, Germany.
  • Kravchuk LV; P.N. Lebedev Physical Institute, Moscow 119991, Russia.
  • Krasnikov NV; Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile.
  • Kuleshov SV; Joint Institute for Nuclear Research, Dubna 141980, Russia.
  • Lyubovitskij VE; Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow 119991, Russia.
  • Lysan V; Institute for Nuclear Research, Moscow 117312, Russia.
  • Matveev VA; Joint Institute for Nuclear Research, Dubna 141980, Russia.
  • Mikhailov YV; Institute for Nuclear Research, Moscow 117312, Russia.
  • Molina Bueno L; Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile.
  • Peshekhonov DV; Tomsk State Pedagogical University, Tomsk 634061, Russia.
  • Polyakov VA; Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile.
  • Radics B; Joint Institute for Nuclear Research, Dubna 141980, Russia.
  • Rojas R; Joint Institute for Nuclear Research, Dubna 141980, Russia.
  • Rubbia A; State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center "Kurchatov Institute" (IHEP), Protvino 142281, Russia.
  • Samoylenko VD; ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland.
  • Sieber H; Joint Institute for Nuclear Research, Dubna 141980, Russia.
  • Shchukin D; State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center "Kurchatov Institute" (IHEP), Protvino 142281, Russia.
  • Tikhomirov VO; ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland.
  • Tlisova I; Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile.
  • Tlisov DA; ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland.
  • Toropin AN; State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center "Kurchatov Institute" (IHEP), Protvino 142281, Russia.
  • Trifonov AY; ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland.
Phys Rev Lett ; 125(8): 081801, 2020 Aug 21.
Article in En | MEDLINE | ID: mdl-32909809
ABSTRACT
We carried out a model-independent search for light scalar (s) and pseudoscalar axionlike (a) particles that couple to two photons by using the high-energy CERN SPS H4 electron beam. The new particles, if they exist, could be produced through the Primakoff effect in interactions of hard bremsstrahlung photons generated by 100 GeV electrons in the NA64 active dump with virtual photons provided by the nuclei of the dump. The a(s) would penetrate the downstream HCAL module, serving as a shield, and would be observed either through their a(s)→γγ decay in the rest of the HCAL detector, or as events with a large missing energy if the a(s) decays downstream of the HCAL. This method allows for the probing of the a(s) parameter space, including those from generic axion models, inaccessible to previous experiments. No evidence of such processes has been found from the analysis of the data corresponding to 2.84×10^{11} electrons on target, allowing us to set new limits on the a(s)γγ-coupling strength for a(s) masses below 55 MeV.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2020 Type: Article Affiliation country: Switzerland
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2020 Type: Article Affiliation country: Switzerland