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Improved exclusion limit for light dark matter from $e^+e^-$ annihilation in NA64

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arxiv 2108.04195 v2 pith:EZDR63VW submitted 2021-08-09 hep-ex hep-ph

Yu. Andreev , D. Banerjee , J. Bernhard , M. Bondi , V. Burtsev , A. Celentano , N. Charitonidis , A. Chumakov
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D. Cooke P. Crivelli E. Depero A. Dermenev S. Donskov R. Dusaev T. Enik A. Feshchenko V. Frolov A. Gardikiotis S. Gerassimov S. Gninenko M. Hoesgen M. Jeckel V. Kachanov A. Karneyeu G. Kekelidze B. Ketzer D. Kirpichnikov M. Kirsanov V. Kolosov I. Konorov S. Kovalenko V. Kramarenko L. Kravchuk N. Krasnikov S. Kuleshov V. Lyubovitskij V. Lysan L. Marsicano V. Matveev Yu. Mikhailov L. Molina D. Peshekhonov V. Polyakov B. Radics R. Rojas A. Rubbia V. Samoylenko H. Sieber D. Shchukin V. Tikhomirov I. Tlisova A. Toropin A. Trifonov P. Ulloa B. Vasilishin G. Vasquez P. Volkov V. Volkov
This is my paper · ORCID
classification hep-exhep-ph
keywords annihilationdarkmatterprimeelectronsna64regionactive
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

The current most stringent constraints for the existence of sub-GeV dark matter coupling to Standard Model via a massive vector boson $A^\prime$ were set by the NA64 experiment for the mass region $m_{A^\prime}\lesssim 250$ MeV, by analyzing data from the interaction of $2.84\cdot10^{11}$ 100-GeV electrons with an active thick target and searching for missing-energy events. In this work, by including $A^\prime$ production via secondary positron annihilation with atomic electrons, we extend these limits in the $200$-$300$ MeV region by almost an order of magnitude, touching for the first time the dark matter relic density constrained parameter combinations. Our new results demonstrate the power of the resonant annihilation process in missing energy dark-matter searches, paving the road to future dedicated $e^+$ beam efforts.

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Cited by 4 Pith papers

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

  1. Proof of principle for a light dark matter search with low-energy positron beams at NA64

    hep-ex 2025-02 accept novelty 6.0 of 10

    A 70 GeV positron-beam missing-energy search at NA64 found zero signal events and set new dark photon limits, demonstrating the feasibility of a future low-energy positron program.

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    The DarkSHINE baseline design projects 90% C.L. sensitivity to dark photon kinetic mixing epsilon^2 as low as ~1e-12 for masses around 1-100 MeV with 3e14 electrons on target.

  3. A congruous approach with realistic cross section towards limiting sub-GeV dark matter from LUX-ZEPLIN

    hep-ph 2025-09 conditional novelty 4.0 of 10

    Using LZ nuclear recoil data, the authors derive 90% CL exclusion limits on cosmic-ray-boosted sub-GeV dark matter for two U(1)' mediator models, with energy-dependent cross sections improving the lower reach versus c...

  4. Blazar Boosted ALP and vector portal Dark matter confronting light mediator searches

    hep-ph 2025-01 conditional novelty 4.0 of 10

    Blazar-boosted dark matter scattering in Super-Kamiokande can exclude previously unconstrained parameter space for ALP- and vector-mediated sub-MeV dark matter, beating BaBar, NA64, beam dump, and stellar cooling limi...

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