%0 Journal Article
%T Search for a light Z' in the L-mu – L-tau scenario with the NA64-e experiment at CERN
%A NA64 Collaboration (Andreev, Y. M. et al
%A Molina Bueno, L.
%J Physical Review D
%D 2022
%V 106
%N 3
%I Amer Physical Soc
%@ 2470-0010
%G English
%F NA64CollaborationAndreev+MolinaBueno2022
%O WOS:000862798400003
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=5376), last updated on Wed, 19 Oct 2022 07:28:36 +0000
%X The extension of Standard Model made by inclusion of additional U(1) gauge L-mu – L-tau 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 x 10(11) 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.
%R 10.1103/PhysRevD.106.032015
%U https://arxiv.org/abs/2206.03101
%U https://doi.org/10.1103/PhysRevD.106.032015
%P 032015-12pp