Examinando por Autor "Kovalenko, S.G."

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    Search for a light Z′ in the Lμ-Lτ scenario with the NA64-e experiment at CERN
    (American Physical Society, 2022-08) Andreev, Yu. M.; Banerjee, D.; Banto Oberhauser, B.; Bernhard, J.; Bisio, P.; Bondí, M.; Burtsev, V.E.; Celentano, A.; Charitonidis, N.; Chumakov, A.G.; Cooke, D.; Crivelli, P.; Depero, E.; Dermenev, A.V.; Donskov, S.V.; Dusaev, R.R.; Enik, T.; 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.; Marsicano, L.; Matveev, V.A.; Mikhailov, Yu. V.; Molina Bueno, L.; Peshekhonov, D.V.; Polyakov, V.A.; Radics, B.; Rojas, R.; Rubbia, A.; Salamatin, K.M.; Samoylenko, V.D.; Sieber, H.; Shchukin, D.; Tikhomirov, V.O.; Tlisova, I.; Toropin, A.N.; Trifonov, A. Yu.; Ulloa, P.; Vasilishin, B.I.; Vasquez Arenas, G.; Volkov, P.V.; Volkov, V. Yu.; Voronchikhin, I.
    The extension of Standard Model made by inclusion of additional U(1) gauge Lμ-Lτ symmetry can explain the difference between the measured and the predicted value of the muon magnetic moment and solve the tension in B meson decays. This model predicts the existence of a new, light Z′ vector boson, predominantly coupled to second and third generation leptons, whose interaction with electrons is due to a loop mechanism involving muons and taus. In this work, we present a rigorous evaluation of the upper limits in the Z′ parameter space, obtained from the analysis of the data collected by the NA64-e experiment at CERN SPS, that performed a search for light dark matter with 2.84×1011 electrons impinging with 100 GeV on an active thick target. The resulting limits touch the muon g-2 preferred band for values of the Z′ mass of order of 1 MeV, while the sensitivity projections for the future high-statistics NA64-e runs demonstrate the power of the electrons/positron beam approach in this theoretical scenario. © 2022 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
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    Search for a New B-L Z′ Gauge Boson with the NA64 Experiment at CERN
    (American Physical Society, 2022-10-14) Andreev, Yu. M.; Banerjee, D.; Oberhauser B., Banto; Bernhard, J.; Bisio, P.; Burtsev, V.E.; Celentano, A.; Charitonidis, N.; Chumakov, A.G.; Cooke, D.; Crivelli, P.; Depero, E.; Dermenev, A.V.; Donskov, S.V.; Dusaev, R.R.; Enik, T.; 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.; Kovalenko, S.G.; Kramarenko, V.A.; Kravchuk, L.V.; Krasnikov, N.V.; Kuleshov, S.V.; Lyubovitskij, V.E.; Lysan, V.; Marsicano, L.; Matveev, V.A.; Mikhailov, Yu. V.; Molina Bueno, L.; Peshekhonov, D.V.; Polyakov, V.A.; Radics, B.; Rubbia, A.; Samalantin, K.M.; Samoylenko, V.D.; Sieber, H.; Shchukin, D.; Soto, O.; Tikhomirov, V.O.; Tlisova, I.V.; Toropin, A.N.; Vasilishin, B.I.; Volkov, P.V.; Volkov, V. Yu.; Voronchikhin, I.; Zamora Saá, J.
    A search for a new Z′ gauge boson associated with (un)broken B-L symmetry in the keV-GeV mass range is carried out for the first time using the missing-energy technique in the NA64 experiment at the CERN SPS. From the analysis of the data with 3.22×1011 electrons on target collected during 2016-2021 runs, no signal events were found. This allows us to derive new constraints on the Z′-e coupling strength, which, for the mass range 0.3mZ′ 100 MeV, are more stringent compared to those obtained from the neutrino-electron scattering data. © 2022 authors. Published by the American Physical Society.