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 < \( {m}_{Z^{\prime }} \) ≲ 2 MeV range, in complementarity with the limits recently obtained by the NA64-μ experiment with a muon beam.
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Acknowledgments
We gratefully acknowledge the support of the CERN management and staff, and the technical staffs of the participating institutions for their vital contributions. This result is part of a project that has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme, Grant agreement No. 947715 (POKER). This work was supported by the HISKP, University of Bonn (Germany), ETH Zurich and SNSF Grant No. 186181, No. 186158, No. 197346, No. 216602 (Switzerland), and FONDECYT (Chile) under Grant No. 1240066, and ANID - Millenium Science Initiative Program - ICN2019 044 (Chile), and RyC-030551-I and PID2021-123955NA-100 funded by MCIN/AEI/ 10.13039/501100011033/FEDER, UE (Spain), and COST Action COSMIC WISPers CA21106, supported by COST (European Cooperation in Science and Technology.
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ArXiv ePrint: 2404.06982
Yu. M. Andreev, A. V. Dermenev, S. V. Donskov, R. R. Dusaev, S. N. Gninenko, V. A. Kachanov, A. E. Karneyeu, D. V. Kirpichnikov, M. M. Kirsanov, V. N. Kolosov, V. A. Kramarenko, L. V. Kravchuk, N. V. Krasnikov, V. E. Lyubovitskij, V. A. Polyakov, V. D. Samoylenko, D. Shchukin, V. O. Tikhomirov, I. Tlisova, A. N. Toropin, P. V. Volkov, V. Yu. Volkov and I. V. Voronchikhin are affiliated with an institute covered by a cooperation agreement with CERN
T. Enik, V. N. Frolov, S. V. Gertsenberger, Y. Kambar, E. A. Kasianova, G. Kekelidze, V. A. Kramarenko, N. V. Krasnikov, V. Lysan, V. A. Matveev, D. V. Peshekhonov, K. Salamatin, P. V. Volkov and A. S. Zhevlakov are affiliated with an international laboratory covered by a cooperation agreement with CERN
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Andreev, Y.M., Antonov, A., Banerjee, D. et al. First constraints on the Lμ − Lτ explanation of the muon g-2 anomaly from NA64-e at CERN. J. High Energ. Phys. 2024, 212 (2024). https://doi.org/10.1007/JHEP07(2024)212
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DOI: https://doi.org/10.1007/JHEP07(2024)212