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CERN Document Server 2,032 εγγραφές βρέθηκαν  1 - 10επόμενοτέλος  μετάβαση στην εγγραφή: Η έρευνα πήρε 1.11 δευτερόλεπτα. 
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Search for pseudoscalar bosons decaying into e+e- pairs / Banerjee, D ; Bernhard, J ; Burtsev, V ; Chumakov, A ; Cooke, D ; Crivelli, P ; Depero, E ; Dermenev, A ; Donskov, S ; Dusaev, R et al. /NA64
We report the results of a search for a light pseudoscalar particle $a$ that couples to electrons and decays to $e^+e^-$ performed using the high-energy CERN SPS H4 electron beam. If such pseudoscalar with a mass $\simeq 17$ MeV exists, it could explain the ATOMKI anomaly. [...]
CERN-EP-2021-069.- Geneva : CERN, 2021 - 6. Draft (restricted): PDF; Fulltext: PDF;
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Search for pseudoscalar bosons decaying into e+e- pairs in the NA64 experiment at the CERN SPS / NA64 Collaboration
We report the results of a search for a light pseudoscalar particle $a$ that couples to electrons and decays to $e^+e^-$ performed using the high-energy CERN SPS H4 electron beam. If such pseudoscalar with a mass $\simeq 17$ MeV exists, it could explain the ATOMKI anomaly. [...]
arXiv:2104.13342.- 2021-12-01 - 5 p. - Published in : Phys. Rev. D 104 (2021) L111102 Fulltext: 2104.13342 - PDF; PhysRevD.104.L111102 (1) - PDF; PhysRevD.104.L111102 - PDF;
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$X_{17}$ anomaly and prospects for its verification with NA64 experiment / Molina Bueno, Laura (Zurich, ETH) /NA64 Collaboration
The ATOMKI collaboration reported a 7$\sigma$ excess in the angular distribution of $e^{+}e^{-}$ events in the nuclear de-excitation of $^8$Be, which was recently confirmed by new results on other nuclei, $^4$He. This anomaly could be explained by the existence of a new boson $X_{17}$ with a mass around 17 MeV and spin 0 or 1. [...]
SISSA, 2021 - 6 p. - Published in : PoS LHCP2020 (2021) 177 Fulltext: PDF;
In : 8th Conference of Large Hadron Collider Physics (LHCP), Online, 25 - 30 May 2020, pp.177
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Photoproduction of axionlike particles in the NA64 experiment / Dusaev, R.R. (Tomsk State U.) ; Kirpichnikov, D.V. (Moscow, INR) ; Kirsanov, M.M. (Moscow, INR)
Axion-like particles $a$ (ALPs) that couple to the Standard Model (SM) gauge fields could be observed in the high-energy photon scattering $\gamma N\to N a$ off nuclei followed by the $a\to \gamma\gamma$ decay. In the present paper we describe the calculation of the ALP production cross-section and the properties of this production. [...]
arXiv:2004.04469.- 2020-09-29 - 8 p. - Published in : Phys. Rev. D 102 (2020) 055018 Article from SCOAP3: PDF; Fulltext: PDF;
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The 8Be excess and search for the X → e+e− decay of a new light boson with NA64 detector / Gninenko, Sergei
The X → e+e− decay of a new short-lived neutral boson X with a mass mX = 16.7 MeV and coupling to electrons in the range 10−4 < εe < 10−3 could explain the excess of e+e− pairs recently observed in the excited 8Be nucleus decays. [...]
CERN-SPSC-2017-016 ; SPSC-SR-211. - 2017.
Fulltext
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Light dark matter search with positron beams at NA64 / Bisio, P ; Bondi, M ; Celentano, A ; Marini, A ; Marsicano, L ; NA64, collaboration
We propose to extend the current NA64 scientific program to include a positron-beam, missing-energy search for light dark matter (LDM) in the mass region above 100 MeV, exploiting the high-quality CERN $e^+$ beam at the SPS H4 beamline. [...]
CERN-SPSC-2024-003 ; SPSC-P-348-ADD-4. - 2024.
Fulltext - Original Document (SPSC-P-348)
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NA64 status report 2023 / Molina Bueno, Laura ; Crivelli, Paolo ; NA64 collaboration, The
In this report, we summarise the 2016-2022 combined analysis on A$'\rightarrow$invisible searches with 9.37$\times10^{11}$ electrons on target. [...]
CERN-SPSC-2023-023 ; SPSC-SR-332. - 2023.
Fulltext
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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
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CERN-PHOTO-202111-172
© 2021-2023 CERN 		NA64 electron and muon experiments and its collaboration
NA64 electron and muon experiments and its collabo [...]
10-11-2021
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Constraints on New Physics in the Electron g-2 from a Search for Invisible Decays of a Scalar, Pseudoscalar, Vector, and Axial Vector / NA64 Collaboration
We performed a search for a new generic $X$ boson, which could be a scalar ($S$), pseudoscalar ($P$), vector ($V$) or an axial vector ($A$) particle produced in the 100 GeV electron scattering off nuclei, $e^- Z \to e^- Z X$, followed by its invisible decay in the NA64 experiment at CERN. No evidence for such process was found in the full NA64 data set of $2.84\times 10^{11}$ electrons on target. [...]
arXiv:2102.01885; CERN-EP-2021-017.- 2021-05-26 - 6 p. - Published in : Phys. Rev. Lett. 126 (2021) 21 Article from SCOAP3: PDF; Fulltext: PDF;
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