First constraints on the Lμ− Lτ explanation of the muon g-2 anomaly from NA64-e at CERN
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Fecha
2024-07
Profesor/a Guía
Facultad/escuela
Idioma
en
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Springer Science and Business Media Deutschland GmbH
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Licencia CC
CC BY 4.0 Attribution 4.0 International
Licencia CC
https://creativecommons.org/licenses/by/4.0/
Resumen
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 <mZ′ ≲ 2 MeV range, in complementarity with the limits recently obtained by the NA64-μ experiment with a muon beam.
Notas
Indexación: Scopus.
Palabras clave
Beyond Standard Model, Dark Matter, Fixed Target Experiments
Citación
Journal of High Energy Physics Open Access Volume 2024, Issue 7July 2024 Article number 212
DOI
10.1007/JHEP07(2024)212