Examinando por Autor "Antonov A."

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    First constraints on the Lμ− Lτ explanation of the muon g-2 anomaly from NA64-e at CERN
    (Springer Science and Business Media Deutschland GmbH, 2024-07) Andreev, Yu. M.; Antonov A.; Banerjee D.; Banto Oberhauser B.; Bernhard J.; Bisio P.; Celentano A.; Charitonidis N.; Cooke D.; Crivelli P.; Depero E.; Dermenev A.V.; Donskov S.V.; Dusaev R.R.; Enik T.; Frolov V.N.; Gardikiotis A.; Gertsenberger S.V.; Girod S.; Gninenko S.N.; Hösgen M.; Kachanov V.A.; Kambar Y.; Karneyeu A.E.; Kasianova E.A.; Kekelidze G.; Ketzer B.; Kirpichnikov D.V.; Kirsanov M.M.; Kolosov V.N.; Kramarenko V.A.; Kravchuk L.V.; Krasnikov N.V.; Kuleshov S.V.; Lyubovitskij V.E.; Lysan V.; Marini A.; Marsicano L.; Matveev V.A.; Mena Fredes R.; Mena Yanssen R.; Molina Bueno L.; Mongillo M.; Peshekhonov D.V.; Polyakov V.A.; Radics B.; Salamatin K.; Samoylenko V.D.; Sieber H.; Shchukin D.; Soto O.; Tikhomirov V.O.; Tlisova I.; Toropin A.N.; Tuzi M.; Ulloa P.; Volkov P.V.; Volkov, V. Yu.; Voronchikhin I.V.; Zamora-Saá J.
    The inclusion of an additional U(1) gauge Lμ − Lτ symmetry would release the tension between the measured and the predicted value of the anomalous muon magnetic moment: this paradigm assumes the existence of a new, light Z′ vector boson, with dominant coupling to μ and τ leptons and interacting with electrons via a loop mechanism. The Lμ − Lτ model can also explain the Dark Matter relic abundance, by assuming that the Z′ boson acts as a “portal” to a new Dark Sector of particles in Nature, not charged under known interactions. In this work we present the results of the Z′ search performed by the NA64-e experiment at CERN SPS, that collected ~ 9 × 1011 100 GeV electrons impinging on an active thick target. Despite the suppressed Z′ production yield with an electron beam, NA64-e provides the first accelerator-based results excluding the g − 2 preferred band of the Z′ parameter space in the 1 keV