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  • Letter
  • Open Access

Improved exclusion limit for light dark matter from e+e− annihilation in NA64

Yu. M. Andreev1, D. Banerjee2, J. Bernhard2, M. Bondì3, V. E. Burtsev4, A. Celentano3,*, N. Charitonidis2, A. G. Chumakov5,6, D. Cooke7 et al.

P. Crivelli8, E. Depero8, A. V. Dermenev1, S. V. Donskov9, R. R. Dusaev5, T. Enik4, A. Feshchenko4, V. N. Frolov4, A. Gardikiotis10, S. G. Gerassimov11,12, S. N. Gninenko1, M. Hösgen13, M. Jeckel2, V. A. Kachanov9, A. E. Karneyeu1, G. Kekelidze4, B. Ketzer13, D. V. Kirpichnikov1, M. M. Kirsanov1, V. N. Kolosov9, I. V. Konorov11,12, S. G. Kovalenko14,15, V. A. Kramarenko4,16, L. V. Kravchuk1, N. V. Krasnikov4,1, S. V. Kuleshov14,15, V. E. Lyubovitskij5,6,17,15, V. Lysan4, L. Marsicano3, V. A. Matveev4, Yu. V. Mikhailov9, L. Molina Bueno8,18, D. V. Peshekhonov4, V. A. Polyakov9, B. Radics8, R. Rojas17, A. Rubbia8, V. D. Samoylenko9, H. Sieber8, D. Shchukin12, V. O. Tikhomirov12, I. Tlisova1, A. N. Toropin1, A. Yu. Trifonov5,6, P. Ulloa14, B. I. Vasilishin5, G. Vasquez Arenas17, P. V. Volkov4,16, and V. Yu. Volkov16

  • 1Institute for Nuclear Research, 117312 Moscow, Russia
  • 2CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland
  • 3INFN, Sezione di Genova, 16147 Genova, Italia
  • 4Joint Institute for Nuclear Research, 141980 Dubna, Russia
  • 5Tomsk Polytechnic University, 634050 Tomsk, Russia
  • 6Tomsk State Pedagogical University, 634061 Tomsk, Russia
  • 7UCL Departement of Physics and Astronomy, University College London, Gower St. London WC1E 6BT, United Kingdom
  • 8ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
  • 9State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’ (IHEP), 142281 Protvino, Russia
  • 10Physics Department, University of Patras, 265 04 Patras, Greece
  • 11Technische Universität München, Physik Department, 85748 Garching, Germany
  • 12P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 119 991 Moscow, Russia
  • 13Universität Bonn, Helmholtz-Institut für Strahlen-und Kernphysik, 53115 Bonn, Germany
  • 14Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7 Santiago, Chile
  • 15Millennium Institute for Subatomic Physics at the High-Energy Frontier (SAPHIR), ICN2019_044 ANID, Chile
  • 16Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
  • 17Universidad Técnica Federico Santa María, 2390123 Valparaíso, Chile
  • 18Instituto de Fisica Corpuscular (CSIC/UV), Carrer del Catedrátic José Beltrán Martinez, 2, 46980 Paterna, Valencia, Spain

  • *Corresponding author. andrea.celentano@ge.infn.it
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Phys. Rev. D 104, L091701 – Published 19 November, 2021

DOI: https://doi.org/10.1103/PhysRevD.104.L091701

Abstract

The current most stringent constraints for the existence of sub-GeV dark matter coupling to Standard Model via a massive vector boson A′ were set by the NA64 experiment for the mass region mA′≲250  MeV, by analyzing data from the interaction of 2.84×1011 100-GeV electrons with an active thick target and searching for missing-energy events. In this work, by including A′ 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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Phys. Rev. D 104, L091701– Published 19 November, 2021
  • Received 16 August 2021
  • Accepted 15 October 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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