@article{b5f779f18dec4a6eb2ff35f828111ffe,
title = "Probing light dark matter with positron beams at NA64",
abstract = "We present the results of a missing-energy search for light dark matter which has a new interaction with ordinary matter transmitted by a vector boson, called dark photon A′. For the first time, this search is performed with a positron beam by using the significantly enhanced production of A′ in the resonant annihilation of positrons with atomic electrons of the target nuclei, followed by the invisible decay of A′ into dark matter. No events were found in the signal region with (10.1±0.1)×109 positrons on target with 100 GeV energy. This allowed us to set new exclusion limits that, relative to the collected statistics, prove the power of this experimental technique. This measurement is a crucial first step toward a future exploration program with positron beams, whose estimated sensitivity is here presented.",
author = "{(NA64 Collaboration)} and Andreev, {Yu M.} and A. Antonov and D. Banerjee and {Banto Oberhauser}, B. and J. Bernhard and P. Bisio and M. Bond{\'i} and A. Celentano and N. Charitonidis and D. Cooke and P. Crivelli and E. Depero and Dermenev, {A. V.} and Donskov, {S. V.} and Dusaev, {R. R.} and T. Enik and Frolov, {V. N.} and A. Gardikiotis and Gninenko, {S. N.} and M. H{\"o}sgen and Kachanov, {V. A.} and Y. Kambar and Karneyeu, {A. E.} and G. Kekelidze and B. Ketzer and Kirpichnikov, {D. V.} and Kirsanov, {M. M.} and Kolosov, {V. N.} and Gertsenberger, {S. V.} and S. Girod and Kasianova, {E. A.} and Kramarenko, {V. A.} and Kravchuk, {L. V.} and Krasnikov, {N. V.} and Kuleshov, {S. V.} and Lyubovitskij, {V. E.} and V. Lysan and A. Marini and L. Marsicano and Matveev, {V. A.} and {Mena Fredes}, R. and {Mena Yanssen}, R. and {Molina Bueno}, L. and M. Mongillo and Peshekhonov, {D. V.} and Polyakov, {V. A.} and B. Radics and K. Salamatin and P. Ulloa and J. Zamora-Sa{\'a}",
note = "Publisher Copyright: {\textcopyright} 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the {"}https://creativecommons.org/licenses/by/4.0/{"}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.",
year = "2024",
month = feb,
day = "1",
doi = "10.1103/PhysRevD.109.L031103",
language = "English",
volume = "109",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "3",
}