Search for Axionlike and Scalar Particles with the NA64 Experiment.

Autor: Banerjee D; CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland.; University of Illinois at Urbana Champaign, Urbana, Illinois 61801-3080, USA., Bernhard J; CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland., Burtsev VE; Joint Institute for Nuclear Research, Dubna 141980, Russia., Chumakov AG; Tomsk State Pedagogical University, Tomsk 634061, Russia., Cooke D; UCL Departement of Physics and Astronomy, University College London, Gower St., London WC1E 6BT, United Kingdom., Crivelli P; ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland., Depero E; ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland., Dermenev AV; Institute for Nuclear Research, Moscow 117312, Russia., Donskov SV; State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center 'Kurchatov Institute' (IHEP), Protvino 142281, Russia., Dusaev RR; Tomsk Polytechnic University, Tomsk 634050, Russia., Enik T; Joint Institute for Nuclear Research, Dubna 141980, Russia., Charitonidis N; CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland., Feshchenko A; Joint Institute for Nuclear Research, Dubna 141980, Russia., Frolov VN; Joint Institute for Nuclear Research, Dubna 141980, Russia., Gardikiotis A; Physics Department, University of Patras, 265 04 Patras, Greece., Gerassimov SG; Technische Universität München, Physik Department, Garching 85748, Germany.; P.N. Lebedev Physical Institute, Moscow 119991, Russia., Gninenko SN; Institute for Nuclear Research, Moscow 117312, Russia., Hösgen M; Universität Bonn, Helmholtz-Institut für Strahlen-und Kernphysik, Bonn 53115, Germany., Jeckel M; CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland., Kachanov VA; State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center 'Kurchatov Institute' (IHEP), Protvino 142281, Russia., Karneyeu AE; Institute for Nuclear Research, Moscow 117312, Russia., Kekelidze G; Joint Institute for Nuclear Research, Dubna 141980, Russia., Ketzer B; Universität Bonn, Helmholtz-Institut für Strahlen-und Kernphysik, Bonn 53115, Germany., Kirpichnikov DV; Institute for Nuclear Research, Moscow 117312, Russia., Kirsanov MM; Institute for Nuclear Research, Moscow 117312, Russia., Kolosov VN; State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center 'Kurchatov Institute' (IHEP), Protvino 142281, Russia., Konorov IV; Technische Universität München, Physik Department, Garching 85748, Germany.; P.N. Lebedev Physical Institute, Moscow 119991, Russia., Kovalenko SG; Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile., Kramarenko VA; Joint Institute for Nuclear Research, Dubna 141980, Russia.; Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow 119991, Russia., Kravchuk LV; Institute for Nuclear Research, Moscow 117312, Russia., Krasnikov NV; Joint Institute for Nuclear Research, Dubna 141980, Russia.; Institute for Nuclear Research, Moscow 117312, Russia., Kuleshov SV; Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile., Lyubovitskij VE; Tomsk State Pedagogical University, Tomsk 634061, Russia.; Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile., Lysan V; Joint Institute for Nuclear Research, Dubna 141980, Russia., Matveev VA; Joint Institute for Nuclear Research, Dubna 141980, Russia., Mikhailov YV; State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center 'Kurchatov Institute' (IHEP), Protvino 142281, Russia., Molina Bueno L; ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland., Peshekhonov DV; Joint Institute for Nuclear Research, Dubna 141980, Russia., Polyakov VA; State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center 'Kurchatov Institute' (IHEP), Protvino 142281, Russia., Radics B; ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland., Rojas R; Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile., Rubbia A; ETH Zürich, Institute for Particle Physics and Astrophysics, 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), Protvino 142281, Russia., Sieber H; ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland., Shchukin D; P.N. Lebedev Physical Institute, Moscow 119991, Russia., Tikhomirov VO; P.N. Lebedev Physical Institute, Moscow 119991, Russia., Tlisova I; Institute for Nuclear Research, Moscow 117312, Russia., Tlisov DA; Institute for Nuclear Research, Moscow 117312, Russia., Toropin AN; Institute for Nuclear Research, Moscow 117312, Russia., Trifonov AY; Tomsk State Pedagogical University, Tomsk 634061, Russia., Vasilishin BI; Tomsk Polytechnic University, Tomsk 634050, Russia., Vasquez Arenas G; Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile., Volkov PV; Joint Institute for Nuclear Research, Dubna 141980, Russia.; Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow 119991, Russia., Volkov VY; Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow 119991, Russia., Ulloa P; Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2020 Aug 21; Vol. 125 (8), pp. 081801.
DOI: 10.1103/PhysRevLett.125.081801
Abstrakt: 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.
Databáze: MEDLINE