Search for a light <i>Z</i>′ in the <i>L</i><sub>μ</sub> - <i>L</i><sub>τ</sub> scenario with the NA64-<i>e</i> experiment at CERN

Andreev, Yu M, Banerjee, D, Oberhauser, B Banto, Bernhard, J, Bisio, P, Bondi, M, Burtsev, VE, Celentano, A, Charitonidis, N, Chumakov, AG
et al (show 51 more authors) (2022) Search for a light <i>Z</i>′ in the <i>L</i><sub>μ</sub> - <i>L</i><sub>τ</sub> scenario with the NA64-<i>e</i> experiment at CERN. PHYSICAL REVIEW D, 106 (3). 032015-.

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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.

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 22 Feb 2023 16:22
Last Modified: 17 Mar 2024 15:10
DOI: 10.1103/PhysRevD.106.032015
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