CERN Accelerating science

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1.
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;
2.
Advanced accelerator concepts for dark sector searches and fast muon acceleration / Zimmermann, Frank (CERN) ; Pukhov, Alexander (Heinrich Heine U., Dusseldorf) ; Badiali, Chiara (Lisbon U.) ; Schulte, Daniel (CERN) ; Franchetti, Giuliano (Darmstadt, GSI ; Frankfurt U.) ; Krasny, Mieczyslaw (LPNHE, Paris) ; Crivelli, Paolo (Zurich, ETH) ; Ischebeck, Rasmus (PSI, Villigen) ; Dadashi Motlagh, Raziyeh (PSI, Villigen ; Ecole Polytechnique, Lausanne) ; Moebius, Silke (Bern U.) et al.
Dielectric laser acceleration (DLA) is a promising approach to accelerate single electrons at a high repetition rate to GeV energies, for indirect dark matter searches. Relevant concepts include the integration of the dielectric structure inside the laser oscillator. [...]
2024 - 4 p. - Published in : JACoW IPAC 2024 (2024) MOPR17 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.MOPR17
3.
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, μNμNX, followed by their decays, Xinvisible. [...]
arXiv:2409.10128; CERN-EP-2024-236.- Geneva : CERN, 2024 - 24 p. Draft (restricted): PDF; Fulltext: CERN-EP-2024-236 - PDF; 2409.10128 - PDF;
4.
NA64 Status Report 2024 / Crivelli, P ; Molina Bueno, L ; Banto Oberhauser, B
In this report, we focus mostly on the results obtained after unblinding the 2022 data using 160 GeV muons at the M2 beamline. [...]
CERN-SPSC-2024-024 ; SPSC-SR-352.
- 2024.
Full text
5.
First constraints on the Lμ− Lτ explanation of the muon g-2 anomaly from NA64-e at CERN / NA64 Collaboration
The inclusion of an additional U(1) gauge LμLτ 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 vector boson, with dominant coupling to μ and τ leptons and interacting with electrons via a loop mechanism. The LμLτ model can also explain the Dark Matter relic abundance, by assuming that the Z 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;
6.
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 (LμLτ) 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;
7.
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). 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. [...]
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;
8.
NA64 status report 2023 / Molina Bueno, Laura ; Crivelli, Paolo ; NA64 collaboration, The
In this report, we summarise the 2016-2022 combined analysis on Ainvisible searches with 9.37×1011 electrons on target. [...]
CERN-SPSC-2023-023 ; SPSC-SR-332.
- 2023.
Fulltext
9.
Production of antihydrogen atoms by 6 keV antiprotons through a positronium cloud / Adrich, P. (NCBJ, Swierk) ; Blumer, P. (Zurich, ETH) ; Caratsch, G. (Zurich, ETH) ; Chung, M. (UNIST, Ulsan) ; Cladé, P. (Paris, Lab. Kastler Brossel) ; Comini, P. (IRFU, Saclay) ; Crivelli, P. (Zurich, ETH) ; Dalkarov, O. (Unlisted) ; Debu, P. (IRFU, Saclay) ; Douillet, A. (Paris, Lab. Kastler Brossel ; U. Evry) et al.
We report on the first production of an antihydrogen beam by charge exchange of 6.1 keV antiprotons with a cloud of positronium in the GBAR experiment at CERN. The antiproton beam was delivered by the AD/ELENA facility. [...]
arXiv:2306.15801.- 2023-11-06 - 18 p. - Published in : Eur. Phys. J. C Fulltext: 2306.15801 - PDF; Publication - PDF; Erratum - PDF;
10.
Search for Light Dark Matter with NA64 at CERN / NA64 Collaboration
Thermal dark matter models with particle χ masses below the electroweak scale can provide an explanation for the observed relic dark matter density. This would imply the existence of a new feeble interaction between the dark and ordinary matter. [...]
arXiv:2307.02404; CERN-EP-2023-130.- 2023-10-16 - 7 p. - Published in : Phys. Rev. Lett. 131 (2023) 161801 Fulltext: 2307.02404 - PDF; Publication - PDF;

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