First constraints on the Lμ − Lτ explanation of the muon g-2 anomaly from NA64-e at CERN-Reference-Cited by-同舟云学术

First constraints on the Lμ − Lτ explanation of the muon g-2 anomaly from NA64-e at CERN

Published:2024-07-23 Issue:7 Volume:2024 Page:
ISSN:1029-8479
Container-title:Journal of High Energy Physics
language:en
Short-container-title:J. High Energ. Phys.

Author:

Andreev Yu. M.^ORCID,Antonov A.^ORCID,Banerjee D.^ORCID,Banto Oberhauser B.^ORCID,Bernhard J.^ORCID,Bisio P.^ORCID,Celentano A.^ORCID,Charitonidis N.^ORCID,Cooke D.,Crivelli P.^ORCID,Depero E.^ORCID,Dermenev A. V.^ORCID,Donskov S. V.^ORCID,Dusaev R. R.^ORCID,Enik T.^ORCID,Frolov V. N.,Gardikiotis A.^ORCID,Gertsenberger S. V.^ORCID,Girod S.,Gninenko S. N.^ORCID,Hösgen M.,Kachanov V. A.^ORCID,Kambar Y.^ORCID,Karneyeu A. E.^ORCID,Kasianova E. A.,Kekelidze G.^ORCID,Ketzer B.^ORCID,Kirpichnikov D. V.^ORCID,Kirsanov M. M.^ORCID,Kolosov V. N.,Kramarenko V. A.^ORCID,Kravchuk L. V.^ORCID,Krasnikov N. V.^ORCID,Kuleshov S. V.^ORCID,Lyubovitskij V. E.^ORCID,Lysan V.^ORCID,Marini A.^ORCID,Marsicano L.^ORCID,Matveev V. A.^ORCID,Mena Fredes R.,Mena Yanssen R.,Molina Bueno L.^ORCID,Mongillo M.^ORCID,Peshekhonov D. V.^ORCID,Polyakov V. A.^ORCID,Radics B.^ORCID,Salamatin K.^ORCID,Samoylenko V. D.,Sieber H.^ORCID,Shchukin D.^ORCID,Soto O.,Tikhomirov V. O.^ORCID,Tlisova I.^ORCID,Toropin A. N.^ORCID,Tuzi M.^ORCID,Ulloa P.^ORCID,Volkov P. V.^ORCID,Volkov V. Yu.^ORCID,Voronchikhin I. V.^ORCID,Zamora-Saá J.^ORCID,Zhevlakov A. S.^ORCID

Abstract

Abstract 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 <

$$ {m}_{Z^{\prime }} $$

m Z ′ ≲ 2 MeV range, in complementarity with the limits recently obtained by the NA64-μ experiment with a muon beam.

Publisher

Springer Science and Business Media LLC

Link

https://link.springer.com/content/pdf/10.1007/JHEP07(2024)212.pdf

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