CERN Accelerating science

CERN Document Server 16 ჩანაწერია ნაპოვნი  1 - 10შემდეგი  ჩანაწერთან გადასვლა: ძიებას დასჭირდა 0.63 წამი. 
1.
Proof of principle for a light dark matter search with low-energy positron beams at NA64 / NA64 Collaboration
Thermal light dark matter (LDM) with particle masses in the 1 MeV - 1 GeV range could successfully explain the observed dark matter abundance as a relic from the primordial Universe. [...]
arXiv:2502.04053.
- 34.
Fulltext
2.
Proof of principle for a light dark matter search with low-energy positron beams at NA64 / Andreev, Yu. M. ; Antonov, A. ; Ayala Torres, M. A. ; Banerjee, D. ; Banto Oberhauser, B. ; Bautin, V. ; Bernhard, J. ; Bisio, P. ; Bondì, M. ; Celentano, A. et al.
Thermal light dark matter (LDM) with particle masses in the 1 MeV - 1 GeV range could successfully explain the observed dark matter abundance as a relic from the primordial Universe. In this picture, a new feeble interaction acts as a “portal” between the Standard Model and LDM particles, allowing for the exploration of this paradigm at accelerator experiments. [...]
CERN-EP-2025-016.- Geneva : CERN, 2025 Draft (restricted): PDF; Fulltext: PDF;
3.
The Ultra-Low material budget GEM based TPC for tracking with VMM3a readout / Garcia, F. (Helsinki U.) ; Flöthner, K.J. (CERN ; Bonn U., HISKP) ; Amato, A. (PSI, Villigen) ; Biswas, S. (PSI, Villigen) ; Brunbauer, F.M. (CERN) ; Heiss, M.W. (PSI, Villigen) ; Janka, G. (PSI, Villigen) ; Janssens, D. (CERN) ; Lisowska, M. (CERN ; U. Paris-Saclay) ; Meurer, M. (CERN ; Munich U.) et al.
The Gaseous Electron Multiplier-based Time Projection Chamber (GEM-TPC) in TWIN configuration for particle tracking has been consolidated after extensive investigations in different facilities to study its tracking performance. [...]
arXiv:2501.09587.
- 7.
Fulltext
4.
Application of the VMM3a/SRS: A t0-less TWIN GEM-based TPC / Flöthner, K.J. (CERN ; Bonn U., HISKP) ; Garcia, F. (Helsinki U.) ; Oberhauser, B. (PSI, Villigen ; Zurich, ETH) ; Brunbauer, F. (CERN) ; Heiss, M.W. (PSI, Villigen) ; Janssens, D. (CERN ; Brussels U., IIHE ; Vrije U., Brussels) ; Ketzer, B. (Bonn U., HISKP) ; Lisowska, M. (CERN) ; Meurer, M. (CERN ; Munich U.) ; Muller, H. (CERN ; Bonn U.) et al.
Integrating the ATLAS/BNL VMM3a ASIC (Application Specific Integrated Circuit) into the RD51/SRS (Scalable Readout System) provides a self-triggered continuous readout system for various gaseous detectors. [...]
arXiv:2501.10207.
- 6.
Fulltext
5.
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;
6.
Shedding light on dark sectors with high-energy muons at the NA64 experiment at the CERN SPS / NA64 Collaboration
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, 2024-12-01 - 23 p. - Published in : Phys. Rev. D 110 (2024) 112015 Draft (restricted): PDF; Fulltext: CERN-EP-2024-236 - PDF; 2409.10128 - PDF; Publication - PDF;
7.
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
8.
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; NA64-PAPER-24-02 - PDF; 2404.06982 - PDF; document - PDF;
9.
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; 2401.01708 - PDF; Publication - PDF;
10.
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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