Hunting down the X17 boson at the CERN SPS.

Autor: Depero E; ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland., Andreev YM; Institute for Nuclear Research, 117312 Moscow, Russia., Banerjee D; CERN, EN-EA, 1211 Geneva 23, Switzerland.; University of Illinois at Urbana Champaign, Urbana, IL 61801-3080 USA., Bernhard J; CERN, EN-EA, 1211 Geneva 23, Switzerland., Burtsev VE; Joint Institute for Nuclear Research, 141980 Dubna, Russia., Charitonidis N; CERN, EN-EA, 1211 Geneva 23, Switzerland., Chumakov AG; Tomsk State Pedagogical University, 634061 Tomsk, Russia., Cooke D; UCL Department of Physics and Astronomy, University College London, Gower St., London, WC1E 6BT UK., Crivelli P; ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, 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., Dusaev RR; Tomsk Polytechnic University, 634050 Tomsk, Russia., Enik T; Joint Institute for Nuclear Research, 141980 Dubna, Russia., Feshchenko A; Joint Institute for Nuclear Research, 141980 Dubna, Russia., Frolov VN; Joint Institute for Nuclear Research, 141980 Dubna, Russia., Gardikiotis A; Physics Department, University of Patras, 265 04 Patras, Greece., Gerassimov SG; Physik Department, Technische Universität München, 85748 Garching, Germany.; P.N. Lebedev Physical Institute, 119 991 Moscow, Russia., Girod S; CERN, EN-EA, 1211 Geneva 23, Switzerland., 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., Kekelidze G; Joint Institute for Nuclear Research, 141980 Dubna, 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., Kolosov VN; State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center 'Kurchatov Institute' (IHEP), 142281 Protvino, Russia., Konorov IV; Physik Department, Technische Universität München, 85748 Garching, Germany.; P.N. Lebedev Physical Institute, 119 991 Moscow, Russia., Kovalenko SG; Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile., Kramarenko VA; Joint Institute for Nuclear Research, 141980 Dubna, Russia.; 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.; Joint Institute for Nuclear Research, 141980 Dubna, Russia., Kuleshov SV; Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile., Lyubovitskij VE; Tomsk State Pedagogical University, 634061 Tomsk, Russia.; Universidad Técnica Federico Santa María, 2390123 Valparaiso, Chile., 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., Bueno LM; ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland., Peshekhonov DV; Joint Institute for Nuclear Research, 141980 Dubna, 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 and Astrophysics, 8093 Zurich, Switzerland., Rojas R; Universidad Técnica Federico Santa María, 2390123 Valparaiso, Chile., Rubbia A; ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, 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., Shchukin D; P.N. Lebedev Physical Institute, 119 991 Moscow, Russia., Sieber H; ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland., Tikhomirov VO; P.N. Lebedev Physical Institute, 119 991 Moscow, Russia., Tlisova V; Institute for Nuclear Research, 117312 Moscow, Russia., Tlisov DA; Institute for Nuclear Research, 117312 Moscow, Russia., Toropin AN; Institute for Nuclear Research, 117312 Moscow, Russia., Trifonov AY; Tomsk State Pedagogical University, 634061 Tomsk, Russia., Vasilishin BI; Tomsk Polytechnic University, 634050 Tomsk, Russia., Arenas GV; Universidad Técnica Federico Santa María, 2390123 Valparaiso, Chile., Volkov PV; Joint Institute for Nuclear Research, 141980 Dubna, Russia.; Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia., Volkov VY; Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia., Ulloa P; Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile.
Jazyk: angličtina
Zdroj: The European physical journal. C, Particles and fields [Eur Phys J C Part Fields] 2020; Vol. 80 (12), pp. 1159. Date of Electronic Publication: 2020 Dec 15.
DOI: 10.1140/epjc/s10052-020-08725-x
Abstrakt: Recently, the ATOMKI experiment has reported new evidence for the excess of e + e - events with a mass ∼ 17 MeV in the nuclear transitions of 4 He, that they previously observed in measurements with 8 Be. These observations could be explained by the existence of a new vector X 17 boson. So far, the search for the decay X 17 → e + e - with the NA64 experiment at the CERN SPS gave negative results. Here, we present a new technique that could be implemented in NA64 aiming to improve the sensitivity and to cover the remaining X 17 parameter space. If a signal-like event is detected, an unambiguous observation is achieved by reconstructing the invariant mass of the X 17 decay with the proposed method. To reach this goal an optimization of the X 17 production target, as well as an efficient and accurate reconstruction of two close decay tracks, is required. A dedicated analysis of the available experimental data making use of the trackers information is presented. This method provides independent confirmation of the NA64 published results [1], validating the tracking procedure. The detailed Monte Carlo study of the proposed setup and the background estimate show that the goal of the proposed search is feasible.
(© The Author(s) 2020.)
Databáze: MEDLINE
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