CERN Accelerating science

NA64 Papers

Latest additions:
2023-01-28
12:56
NA64—Search for Dark Sector Particles / Banerjee, Dipanwita (CERN)
NA64 is a fixed target dark matter experiment at the CERN SPS searching for dark photons ( $$A'$$ ) in the sub-GeV mass range at the secondary beamlines of the CERN North....
2022. - 11 p.

Detailed record - Similar records
2023-01-11
06:08
Physics Beyond Colliders: The Conventional Beams Working Group / Mussolini, Carlo Alberto (CERN ; JAI, UK ; Oxford U.) ; Banerjee, Dipanwita (CERN) ; Baratto Roldan, Anna (CERN) ; Bernhard, Johannes (CERN) ; Brugger, Markus (CERN) ; Charitonidis, Nikolaos (CERN) ; D'Alessandro, Gian Luigi (CERN) ; Gatignon, Laurent (CERN ; Lancaster U.) ; Gerbershagen, Alexander (CERN) ; Metzger, Fabian (CERN ; Bonn U., HISKP) et al.
The Physics Beyond Colliders initiative aims to exploit the full scientific potential of the CERN accelerator complex and its scientific infrastructure for particle physics studies, complementary to current and future collider experiments. Several experiments have been proposed to fully utilize and further advance the beam options for the existing fixed target experiments present in the North and East Experimental Areas of the CERN SPS and PS accelerators. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 1745-1748 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1745-1748

Detailed record - Similar records
2022-07-23
04:03
Search for a New $B$ - $L$ $Z'$ Gauge Boson with the NA64 Experiment at CERN / NA64 Collaboration
A search for a new $Z'$ gauge boson associated with (un)broken B-L symmetry in the keV-GeV mass range is carried out for the first time using the missing-energy technique in the NA64 experiment at the CERN SPS. From the analysis of the data with 3.22e11 electrons on target collected during 2016-2021 runs no signal events were found. [...]
arXiv:2207.09979; CERN-EP-2022-156.- 2022-10-12 - 7 p. - Published in : Phys. Rev. Lett. 129 (2022) 161801 Fulltext: PDF;

Detailed record - Similar records
2022-07-08
04:18
Leptonic scalar portal: Origin of muon g-2 anomaly and dark matter? / Gninenko, S.N. (Moscow, INR) ; Krasnikov, N.V. (Moscow, INR ; Dubna, JINR) /NA64 Collaboration
We present a model explaining both the 4.2 $\sigma$ muon $g-2$ anomaly and the relic density of dark matter (DM) in which DM interacts with the Standard Model (SM) via a scalar portal boson $\varphi$ carrying both dark and SM leptonic numbers, and mediating a nondiagonal interaction between the electron and muon that allows $e \leftrightarrow \mu$ transitions. The $\varphi$ could be produced in high-energy electron scattering off a target nuclei in the reaction $e Z \to \mu Z\varphi$ followed by the prompt invisible decay $\varphi~\to$~DM particles and searched for in events with large missing energy accompanied by a single outgoing muon in the final state. [...]
arXiv:2202.04410.- 2022-07-01 - 6 p. - Published in : Phys. Rev. D 106 (2022) 015003 Fulltext: PDF;

Detailed record - Similar records
2022-06-24
04:59
Search for a light $Z′$ in the $L_μ-L_τ$ scenario with the NA64-$e$ experiment at CERN / NA64 Collaboration
The extension of Standard Model made by inclusion of additional $U(1)$ gauge $L_\mu-L_\tau$ symmetry can explain the difference between the measured and the predicted value of the muon magnetic moment and solve the tension in $B$ meson decays. This model predicts the existence of a new, light $Z^\prime$ vector boson, predominantly coupled to second and third generation leptons, whose interaction with electrons is due to a loop mechanism involving muons and taus. [...]
arXiv:2206.03101.- 2022-08-01 - 11 p. - Published in : Phys. Rev. D 106 (2022) 032015 Fulltext: PhysRevD.106.032015 - PDF; 2206.03101 - PDF;

Detailed record - Similar records
2022-06-01
16:42
Search for a light muon-philic Z′ with the NA64-e experiment at CERN / Andreev, Yu. M. ; Banerjee, D. ; Banto Oberhauser, B. ; Bernhard, J. ; Bisio, P. ; Bondì, M. ; Burtsev, V. E. ; Celentano, A. ; Charitonidis, N. ; Chumakov, A. G. et al.
The extension of Standard Model made by inclusion of additional U (1) gauge L_μ − L_τ symmetry can explain the difference between the measured and the predicted value of the muon magnetic moment and solve the tension in B meson decays. This model predicts the existence of a new, light Z′ vector boson, predominantly coupled to second and third generation leptons, whose interaction with electrons is due to a loop mechanism involving muons and taus. [...]
CERN-EP-2022-118.- Geneva : CERN, 2022 Draft (restricted): PDF; Fulltext: CERN-EP-2022-118 - PDF; CERN-EP-2022-118_2 - PDF;

Detailed record - Similar records
2022-01-12
06:18
Search for light dark matter in the NA64 experiment / Gninenko, S N (Moscow, INR) ; Krasnikov, N V (Moscow, INR ; Dubna, JINR) ; Matveev, V A (Moscow, INR ; Dubna, JINR)
We review the most important models of light dark matter and discuss the NA64 experiment aimed at searching for hypothetical particles, including dark matter, in the mass range $\le \it {O}\rm{(1)}$ GeV with the use of electron and muon beams at the Super Proton Synchrotron (SPS) accelerator at CERN. We consider the methods and results of searches in the NA64 and other accelerator experiments and also discuss their further prospects..
2021 - 26 p. - Published in : Uspekhi Fiz. Nauk 191 (2021) 1361-1386 External link: Fulltext

Detailed record - Similar records
2021-08-12
10:11
$X_{17}$ 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

Detailed record - Similar records
2021-07-02
11:17
Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel / Cazzaniga, C. (Zurich, ETH) ; Odagiu, P. (Zurich, ETH ; EPFL, Lausanne, FSL) ; Depero, E. (Zurich, ETH) ; Bueno, L. Molina (Zurich, ETH ; Valencia U., IFIC) ; Andreev, Yu. M. (Moscow, INR) ; Banerjee, D. (CERN ; Illinois U., Urbana (main)) ; Bernhard, J. (CERN) ; Burtsev, V.E. (Dubna, JINR) ; Charitonidis, N. (CERN) ; Chumakov, A.G. (Tomsk Pedagogical Inst. ; Tomsk Polytechnic U.) et al.
We report the results of a search for a new vector boson ($\gp$) decaying into two dark matter particles $\chi_1 \chi_2$ of different mass. The heavier $\chi_2$ particle subsequently decays to $\chi_1$ and $\gp \to \pair$. [...]
arXiv:2107.02021.- Geneva : CERN, 2021-10-30 - 6. - Published in : Eur. Phys. J. C 81 (2021) 959 Draft (restricted): PDF; Fulltext: 2107.02021 - PDF; document - PDF; CERN-EP-2021-129 - PDF;

Detailed record - Similar records
2021-04-30
04:20
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;

Detailed record - Similar records