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Search for a Hypothetical 16.7 MeV Gauge Boson and Dark Photons in the NA64 Experiment at CERN

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arxiv 1803.07748 v2 pith:BG3AIILE submitted 2018-03-21 hep-ex hep-ph

D. Banerjee , V.E. Burtsev , A. G.Chumakov , D. Cooke , P.Crivelli , E. Depero , A. V. Dermenev , S. V. Donskov
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R. R. Dusaev T. Enik N. Charitonidis A. Feshchenko V. N. Frolov A. Gardikiotis S. G. Gerassimov S. N. Gninenko M. Hosgen M. Jeckel A. E. Karneyeu G. Kekelidze B. Ketzer D. V. Kirpichnikov M. M. Kirsanov I. V. Konorov S. G. Kovalenko V. A. Kramarenko L. V. Kravchuk N. V. Krasnikov S. V. Kuleshov V. E. Lyubovitskij V. Lysan V. A. Matveev Yu. V. Mikhailov D. V. Peshekhonov V. A. Polyakov B. Radics R. Rojas A. Rubbia V. D. Samoylenko V. O. Tikhomirov D. A. Tlisov A. N. Toropin A. Yu. Trifonov B. I. Vasilishin G. Vasquez Arenas P. V. Volkov V. Volkov P. Ulloa
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classification hep-exhep-ph
keywords photonstimesbosonbremsstrahlungcerncouplingdarkdecay
verification ladder T0 review T1 audit T2 compute T3 formal
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We report the first results on a direct search for a new 16.7 MeV boson (X) which could explain the anomalous excess of e+e- pairs observed in the excited Be-8 nucleus decays. Due to its coupling to electrons, the X could be produced in the bremsstrahlung reaction e- Z -> e- Z X by a 100 GeV e- beam incident on an active target in the NA64 experiment at the CERN SPS and observed through the subsequent decay into an e+e- pair. With 5.4\times 10^{10} electrons on target, no evidence for such decays was found, allowing to set first limits on the X-e^- coupling in the range 1.3\times 10^{-4} < \epsilon_e < 4.2\times 10^{-4} excluding part of the allowed parameter space. We also set new bounds on the mixing strength of photons with dark photons (A') from non-observation of the decay A'->e+e- of the bremsstrahlung A' with a mass <~ 23 MeV.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Flavor specific chiral $U(1)_X$ framework for explaining the ATOMKI anomaly

    hep-ph 2026-04 unverdicted novelty 6.0 of 10

    A gauged, flavor-specific U(1)_X two-Higgs-doublet model can realize the axial-vector Z' couplings needed to explain the ATOMKI 8Be and 4He anomalies while evading current bounds.

  2. Probing the ATOMKI X17 vector boson using Dalitz decays $V\to Pe^+e^-$

    hep-ph 2025-06 conditional novelty 6.0 of 10

    In a quark-model calculation, X17 contributions to D*, B*, and J/psi Dalitz decays are too small to explain the BESIII D*0 e+e- excess unless quark couplings are far outside ATOMKI-favored ranges.

  3. Where to find $X(17)$?

    hep-ph 2026-01 reject novelty 4.0 of 10

    Combining existing bounds with a new parity-violating Møller asymmetry constraint, the paper's body claims no surviving parameter space for scalar, pseudoscalar, vector, axial-vector, or V±A X(17)-electron couplings.

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