Search for a light Z′ in the Lμ-Lτ scenario with the NA64-e experiment at CERN

(NA64 Collaboration)

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva


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.

Idioma originalInglés
Número de artículo032015
PublicaciónPhysical Review D
EstadoPublicada - 1 ago. 2022

Áreas temáticas de ASJC Scopus

  • Física nuclear y de alta energía


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