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NA64 Papers

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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 / Andreev, Yu.M. (Unlisted) ; Antonov, A. (INFN, Genoa) ; Banerjee, D. (CERN) ; Banto Oberhauser, B. (Zurich, ETH) ; Bernhard, J. (CERN) ; Bisio, P. (Kobe U. ; INFN, Genoa ; Genoa U.) ; Bondí, M. (INFN, Catania) ; Celentano, A. (INFN, Genoa) ; Charitonidis, N. (CERN) ; Cooke, D. (University Coll. London) et al.
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, 2023 - 6. Draft (restricted): PDF; Fulltext: CERN-EP-2023-192 - PDF; 2308.15612 - PDF;

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2023-07-06
08:11
Search for Light Dark Matter with NA64 at CERN / NA64 Collaboration
Thermal dark matter models with particle $\chi$ 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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2023-05-27
00:27
Measurement of the intrinsic hadronic contamination in the NA64<math altimg="si2.svg" display="inline" id="d1e670"><mrow><mo>−</mo><mi>e</mi></mrow></math> high-purity <math altimg="si3.svg" display="inline" id="d1e678"><mrow><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><mo>/</mo><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math> beam at CERN / Andreev, Yu.M. (Unlisted) ; Banerjee, D. (CERN) ; Oberhauser, B. Banto (Zurich, ETH) ; Bernhard, J. (CERN) ; Bisio, P. (INFN, Genoa ; Genoa U.) ; Bondí, M. (INFN, Catania) ; Celentano, A. (INFN, Genoa) ; Charitonidis, N. (CERN) ; Chumakov, A.G. (Unlisted) ; Cooke, D. (University Coll. London) et al.
In this study, we present the measurement of the intrinsic hadronic contamination at the CERN SPS H4 beamline configured to transport electrons and positrons at 100 GeV/c momentum. The analysis was performed using data collected by the NA64-$e$ experiment in 2022. [...]
arXiv:2305.19411; CERN-EP-2023-108.- Geneva : CERN, 2023-10-12 - 8 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1057 (2023) 168776 Draft (restricted): PDF; Fulltext: 2305.19411 - PDF; Publication - PDF; CERN-EP-2023-108 - PDF;

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2023-05-25
04:05
Constraining light thermal inelastic dark matter with NA64 / Mongillo, Martina (Zurich, ETH) ; Abdullahi, Asli (Fermilab ; Durham U., IPPP) ; Oberhauser, Benjamin Banto (Zurich, ETH) ; Crivelli, Paolo (Zurich, ETH) ; Hostert, Matheus (Cambridge U., DAMTP ; Perimeter Inst. Theor. Phys. ; Minnesota U. ; Minnesota U., Theor. Phys. Inst.) ; Massaro, Daniele (Bologna U. ; INFN, Bologna ; Louvain U., CP3) ; Bueno, Laura Molina (Valencia U., IFIC) ; Pascoli, Silvia (Bologna U. ; INFN, Bologna ; CERN)
A vector portal between the Standard Model and the dark sector is a predictive and compelling framework for thermal dark matter. Through co-annihilations, models of inelastic dark matter (iDM) and inelastic Dirac dark matter (i2DM) can reproduce the observed relic density in the MeV to GeV mass range without violating cosmological limits. [...]
arXiv:2302.05414; IRMP-CP3-23-09; FERMILAB-PUB-23-066-T.- 2023-05-10 - 14 p. - Published in : Eur. Phys. J. C 83 (2023) 391 Fulltext: FERMILAB-PUB-23-066-T - PDF; 2302.05414 - PDF; Fulltext from Publisher: PDF; External link: Fermilab Library Server

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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 Area. It uses the electron beam from the H4 beamline and the muon beam from the M2 beamline with an aim to detect the dark photons from the interaction of the beam in an active target, an electromagnetic calorimeter (ECAL). [...]
2022 - 11 p. - Published in : 10.1007/978-3-031-05625-3_11
In : Advances in cosmology, pp.183-193

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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

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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 - 6 p. - Published in : Phys. Rev. Lett. 129 (2022) 161801 Fulltext: PDF;

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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: 2202.04410 - PDF; Publication - PDF;

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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;

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