Электронный каталог

Статья

Andreev, Yu.M.
First Constraints on the L&sub(*m)-L&sub(*t) Explanation of the Muon g-2 Anomaly from NA64-e at CERN / Yu.M.Andreev, T.Enik, V.N.Frolov, S.V.Gertsenberger, Y.Kambar, E.A.Kasianova, G.Kekelidze, V.A.Kramarenko, N.V.Krasnikov, V.Lysan, V.A.Matveev, D.V.Peshekhonov, K.Salamatin, P.V.Volkov, A.S.Zhevlakov, [NA64 Collab.] // Journal of High Energy Physics [Electronic resource]. – 2024. – Vol. 2024, No. 7. – P. 212. – URL: https://doi.org/10.1007/JHEP07(2024)212. – Bibliogr.: 49.

The inclusion of an additional U(1) gauge L&sub(*m)-L&sub(*t) 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 L&sub(*m)-L&sub(*t) 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 × 10*1*1 100 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 < mZ′ ≲ 2 MeV range, in complementarity with the limits recently obtained by the NA64-μ experiment with a muon beam.



ОИЯИ = ОИЯИ (JINR)2024
Спец.(статьи,препринты) = С 346.3а - Основные свойства мю-мезонов: масса, типы и времена распадов
Спец.(статьи,препринты) = С 346.2в - Взаимодействие протонов с протонами
Спец.(статьи,препринты) = С 322.1 - Общая теория относительности и гравитация
Бюллетени = 43/024