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NA64 Papers

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2024-12-06
06:16
Search for Dark Matter at NA62 and NA64 experiments / Duk, Viacheslav (INFN, Perugia) ; Kirsanov, Mikhail (Moscow, INR) /NA62 Collaboration ; NA64 Collaboration
Searches for Dark Matter with the NA62 and NA64 experiments at CERN are presented. In the NA62 experiment the search is in the decays $A^\prime \to \mu \mu$ and $A^\prime \to e e$, where $A^\prime$ is a new vector particle corresponding to a vector mediator field. [...]
2024 - 4 p. - Published in : PoS LHCP2023 (2024) 178 Fulltext: PDF;
In : 11th Large Hadron Collider Physics Conference 2023, Belgrade, Serbia, 22 - 26 May 2023, pp.178

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2024-12-04
07:42
Dark sector searches at NA64-$e$ / Celentano, Andrea (INFN, Genoa) /NA64 Collaboration
The Light Dark Matter (LDM) hypothesis identifies dark matter particles with new sub-GeV "Hidden Sector'' states, neutral under Standard Model interactions and interfacing with our world through a new force. In the simplest model, the new interaction is mediated by a massive vector particle, also called "dark photon'' ($A^\prime$), kinetically mixed with the ordinary photon. [...]
2024 - 6 p. - Published in : PoS WIFAI2023 (2024) 014 Fulltext: PDF;
In : Workshop Italiano sulla Fisica ad Alta Intensita (WIFAI 2023), Rome, Italy, 8 - 10 Nov 2023, pp.014

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2024-11-14
08:02
Dark-Sector Search via Pion-Produced η and η′ Mesons Decaying Invisibly in the NA64h Detector / NA64 Collaboration
We present the first results from a proof-of-concept search for dark sectors via invisible decays of pseudoscalar η and η′ mesons in the NA64h experiment at the CERN SPS. Our novel technique uses the charge-exchange reaction of 50 GeV π- on nuclei of an active target as the source of neutral mesons. [...]
2024 - 6 p. - Published in : Phys. Rev. Lett. 133 (2024) 121803 Fulltext: PDF;

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2024-09-10
15:33
Shedding light on Dark Sectors with high-energy muons at the NA64 experiment at the CERN SPS / Andreev, Yu.M. (Unlisted) ; Banerjee, D. (CERN) ; Banto Oberhauser, B. (Zurich, ETH) ; Bernhard, J. (CERN) ; Bisio, P. (Kobe U. ; INFN, Genoa) ; Charitonidis, N. (CERN) ; Crivelli, P. (Zurich, ETH) ; Depero, E. (Zurich, ETH) ; Dermenev, A.V. (Unlisted) ; Donskov, S.V. (Unlisted) et al. /NA64
A search for Dark Sectors is performed using the unique M2 beam line at the CERN Super Proton Synchrotron. New particles ($X$) could be produced in the bremsstrahlung-like reaction of high energy 160 GeV muons impinging on an active target, $\mu N\rightarrow\mu NX$, followed by their decays, $X\rightarrow\text{invisible}$. [...]
arXiv:2409.10128; CERN-EP-2024-236.- Geneva : CERN, 2024 - 24 p. Draft (restricted): PDF; Fulltext: CERN-EP-2024-236 - PDF; 2409.10128 - PDF;

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2024-05-30
08:56
50 GeV π− in, nothing out: a sensitive probe of invisible η and η′ decays with NA64h / Andreev, Yu.M. (Unlisted) ; Antonov, A. (INFN, Genoa) ; Ayala Torres, M.A. (Andres Bello Natl. U. ; SAPHIR Millennium Inst.) ; Banerjee, D. (CERN) ; Oberhauser, B. Banto (Zurich, ETH) ; Bernhard, J. (CERN) ; Bisio, P. (INFN, Genoa ; U. Genoa) ; Celentano, A. (INFN, Genoa) ; Charitonidis, N. (CERN) ; Cooke, D. (University Coll. London) et al. /NA64
We present the first results from a proof-of-concept search for dark sectors via invisible decays of pseudoscalar η and η′ mesons in the NA64h experiment at the CERN SPS. Our novel technique uses the charge-exchange reaction of 50 GeV π− on nuclei of an active target as the source of neutral mesons. [...]
arXiv:2406.01990; CERN-EP-2024-153.- Geneva : CERN, 2024 - 5 p. Fulltext: 2406.01990 - PDF; CERN-EP-DRAFT-NA64-2024-002_v2 - PDF; CERN-EP-DRAFT-NA64-2024-002 - PDF;

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2024-04-08
21:04
First constraints on the L$_{μ}$− L$_{τ}$ explanation of the muon g-2 anomaly from NA64-e at CERN / NA64 Collaboration
The inclusion of an additional $U(1)$ gauge $L_\mu-L_\tau$ 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 $Z^\prime$ vector boson, with dominant coupling to $\mu$ and $\tau$ leptons and interacting with electrons via a loop mechanism. The $L_\mu-L_\tau$ model can also explain the Dark Matter relic abundance, by assuming that the $Z^\prime$ boson acts as a ``portal'' to a new Dark Sector of particles in Nature, not charged under known interactions. [...]
arXiv:2404.06982; CERN-EP-2024-103.- Geneva : CERN, 2024-07-23 - 15 p. - Published in : JHEP 2407 (2024) 212 Draft (restricted): PDF; Fulltext: CERN-EP-2024-103 - PDF; document - PDF; NA64-PAPER-24-02 - PDF; 2404.06982 - PDF;

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2024-03-21
08:14
THE NA64$\mu$ Experiment at the CERN SPS / Gertsenberger, S V (Dubna, JINR)
The NA64 experiment is a fixed-target experiment at the CERN Super Proton Synchrotron combining the active beam dump and missing energy techniques to search for rare events with 100–150 GeV electron or muon beams. The article presents the program of the NA64 experiment to explore dark sectors coupled to muons, NA64$\mu$. [...]
2024 - 5 p. - Published in : Phys. At. Nucl. 86 (2023) 1310-1314

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2023-12-18
23:31
First Results in the Search for Dark Sectors at NA64 with the CERN SPS High Energy Muon Beam / NA64 Collaboration
We report on a search for a new $Z'$ ($L_\mu-L_\tau$) vector boson performed at the NA64 experiment employing a high energy muon beam and a missing energy-momentum technique. Muons from the M2 beamline at the CERN Super Proton Synchrotron with a momentum of 160 GeV/c are directed to an active target. [...]
arXiv:2401.01708; CERN-EP-2023-306.- Geneva : CERN, 2024-05-21 - 5 p. - Published in : Phys. Rev. Lett. 132 (2024) 211803 Draft (restricted): PDF; Fulltext: CERN-EP-2023-306 - PDF; Publication - PDF; 2401.01708 - PDF;

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2023-09-06
06:06
Latest results and future prospects of the NA64 experiment at CERN SPS / Marsicano, Luca (INFN, Genoa) /NA64 Collaboration
The search for Dark Matter (DM) is one of the hottest topics of modern physics. Despite the various astrophysical and cosmological observations proving its existence, its elementary properties remain to date unknown. [...]
2022 - 6 p. - Published in : PoS: ICHEP2022, pp. 174
Fulltext: PDF;
In : 41st International Conference on High Energy Physics (ICHEP 2022), Bologna, Italy, 6 - 13 Jul 2022, pp.174

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2023-08-28
18:35
Probing light dark matter with positron beams at NA64 / NA64 Collaboration
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 ($A^\prime$). For the first time, this search is performed with a positron beam by using the significantly enhanced production of $A^\prime$ in the resonant annihilation of positrons with atomic electrons of the target nuclei, followed by the invisible decay of $A^\prime$ into dark matter. [...]
arXiv:2308.15612; CERN-EP-2023-192.- Geneva : CERN, 2024-02-01 - 6 p. - Published in : Phys. Rev. D 109 (2024) L031103 Draft (restricted): PDF; Fulltext: CERN-EP-2023-192 - PDF; 2308.15612 - PDF; Publication - PDF;

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