Explanipedia

Proof of principle for a light dark matter search with low-energy positron beams at NA64 Open

Yuri Andreev, А. Антонов, M. Ayala-Torres, D. Banerjee, B. Banto Oberhauser , et al. · 2025

A bstract 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 a…

Proof of principle for a light dark matter search with low-energy positron beams at NA64 Open

Yuri Andreev, А. Антонов, D. Banerjee, B. Banto Oberhauser, V. Bautin , et al. · 2025

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 "por…

Shedding light on dark sectors with high-energy muons at the NA64 experiment at the CERN SPS Open

Yuri Andreev, D. Banerjee, B. Banto Oberhauser, J. Bernhard, P. Bisio , et al. · 2024

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 positively charged muons impinging on…

Probing hidden leptonic scalar portals using the NA64 experiment at CERN Open

Axel Pontén, H. Sieber, B. Banto Oberhauser, P. Crivelli, D. Kirpichnikov , et al. · 2024

In this study, we demonstrate the potential of the NA64 experiment at CERN SPS to search for New Physics processes involving $$e\rightarrow \mu $$ transitions after the collision of 100 GeV electrons with target nuclei. A new Dark Sec…

Dark-Sector Search via Pion-Produced and Mesons Decaying Invisibly in the NA64h Detector Open

Yuri Andreev, A. Antonov, M. Ayala-Torres, D. Banerjee, B. Banto Oberhauser , et al. · 2024

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− o…

Shedding light on Dark Sectors with high-energy muons at the NA64 experiment at the CERN SPS Open

Yuri Andreev, D. Banerjee, B. Banto Oberhauser, J. Bernhard, P. Bisio , et al. · 2024

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…

First constraints on the Lμ − Lτ explanation of the muon g-2 anomaly from NA64-e at CERN Open

Yuri Andreev, A. Antonov, D. Banerjee, B. Banto Oberhauser, J. Bernhard , et al. · 2024

50 GeV $π^-$ in, nothing out: a sensitive probe of invisible $η$ and $η'$ decays with NA64h Open

Yuri Andreev, A. Antonov, M. Ayala-Torres, D. Banerjee, B. Banto Oberhauser , et al. · 2024

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 …

First Results in the Search for Dark Sectors at NA64 with the CERN SPS High Energy Muon Beam Open

Yuri Andreev, D. Banerjee, B. Banto Oberhauser, J. Bernhard, P. Bisio , et al. · 2024

We report the first search for dark sectors 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 …

Probing Hidden Leptonic Scalar Portals using the NA64 Experiment at CERN Open

Axel Ponten, H. Sieber, B. Banto Oberhauser, P. Crivelli, D. Kirpichnikov , et al. · 2024

In this study, we demonstrate the potential of the NA64 experiment at CERN SPS to search for New Physics processes involving $e\rightarrowμ$ transitions after the collision of 100 GeV electrons with target nuclei. A new Dark Sector leptoni…

First constraints on the $L_μ-L_τ$ explanation of the muon $g-2$ anomaly from NA64-$e$ at CERN Open

Yuri Andreev, А. Антонов, D. Banerjee, B. Banto Oberhauser, J. Bernhard , et al. · 2024

The inclusion of an additional $U(1)$ gauge $L_μ-L_τ$ 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 $Z^\prime$ vec…

Probing light dark matter with positron beams at NA64 Open

Yuri Andreev, A. Antonov, D. Banerjee, B. Banto Oberhauser, J. Bernhard , et al. · 2024

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 bea…

Search for Light Dark Matter with NA64 at CERN Open

Yuri Andreev, D. Banerjee, B. Banto Oberhauser, J. Bernhard, P. Bisio , et al. · 2023

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 m…

Measurement of the intrinsic hadronic contamination in the NA64 high-purity beam at CERN Open

Yuri Andreev, D. Banerjee, B. Banto Oberhauser, J. Bernhard, P. Bisio , et al. · 2023

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. The analysis, performed using data collected by the NA64-e experiment in 2022, is …

Probing Light Dark Matter with positron beams at NA64 Open

Yuri Andreev, А. Антонов, D. Banerjee, B. Banto Oberhauser, J. Bernhard , et al. · 2023

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 posi…

Search for Light Dark Matter with NA64 at CERN Open

Yuri Andreev, D. Banerjee, B. Banto Oberhauser, J. Bernhard, P. Bisio , et al. · 2023

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…

Measurement of the intrinsic hadronic contamination in the NA64$-e$ high-purity $e^+/e^-$ beam at CERN Open

Yuri Andreev, D. Banerjee, B. Banto Oberhauser, J. Bernhard, P. Bisio , et al. · 2023

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 NA6…

Search for a New Gauge Boson with the NA64 Experiment at CERN Open

Yuri Andreev, D. Banerjee, B. Banto Oberhauser, J. Bernhard, P. Bisio , et al. · 2022

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 da…

Search for a light in the scenario with the NA64- experiment at CERN Open

Yuri Andreev, D. Banerjee, B. Banto Oberhauser, J. Bernhard, P. Bisio , et al. · 2022

The extension of Standard Model made by inclusion of additional U(1) gauge Lμ-Lτ 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 mod…

Search for pseudoscalar bosons decaying into pairs in the NA64 experiment at the CERN SPS Open

Yuri Andreev, D. Banerjee, J. Bernhard, V.E. Burtsev, N. Charitonidis , et al. · 2021

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 light pseudoscalar exists, it could explain the ATOMKI an…

Improved exclusion limit for light dark matter from annihilation in NA64 Open

Yuri Andreev, D. Banerjee, J. Bernhard, M. Bondì, V.E. Burtsev , et al. · 2021

The current most stringent constraints for the existence of sub-GeV dark matter coupling to Standard Model via a massive vector boson ${A}^{\ensuremath{'}}$ were set by the NA64 experiment for the mass region ${m}_{{A}^{\ensuremath{'}}}\en…

Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel Open

Cesare Cazzaniga, P. Odagiu, E. Depero, L. Molina Bueno, Yuri Andreev , et al. · 2021

Constraints on New Physics in Electron from a Search for Invisible Decays of a Scalar, Pseudoscalar, Vector, and Axial Vector Open

Yuri Andreev, D. Banerjee, J. Bernhard, V.E. Burtsev, А. Г. Чумаков , et al. · 2021

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→e-ZX, followed by its invisible decay i…

Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel Open

Cesare Cazzaniga, P. Odagiu, E. Depero, L. Molina Bueno, Yuri Andreev , et al. · 2021

We report the results of a search for a new vector boson ($A'$) decaying into\ntwo dark matter particles $\\chi_1 \\chi_2$ of different mass. The heavier\n$\\chi_2$ particle subsequently decays to $\\chi_1$ and $A' \\to e^- e^+$. For a\nsu…

Hunting down the X17 boson at the CERN SPS Open

E. Depero, Yuri Andreev, D. Banerjee, J. Bernhard, V.E. Burtsev , et al. · 2020

Recently, the ATOMKI experiment has reported new evidence for the excess of $e^+ e^-$ events with a mass $\sim$17 MeV in the nuclear transitions of $^4$He, that they previously observed in measurements with $^8$Be. These observations could…

Search for Axionlike and Scalar Particles with the NA64 Experiment Open

D. Banerjee, J. Bernhard, V.E. Burtsev, А. Г. Чумаков, D. Cooke , et al. · 2020

We carried out a model-independent search for light scalar (s) and pseudoscalar axionlike (a) particles that couple to two photons by using the high-energy CERN SPS H4 electron beam. The new particles, if they exist, could be produced thro…

Search for scalar and axionlike particles with the NA64 experiment Open

D. Banerjee, J. Bernhard, V.E. Burtsev, А. Г. Чумаков, D. Cooke , et al. · 2020

We carried out a model-independent search for light scalar (s) and pseudoscalar axionlike (a) particles that couple to two photons by using the high-energy CERN SPS H4 electron beam. The new particles, if they exist, could be produced thro…

Improved limits on a hypothetical boson and a dark photon decaying into pairs Open

D. Banerjee, J. Bernhard, V.E. Burtsev, А. Г. Чумаков, D. Cooke , et al. · 2020

The improved results on a direct search for a new X(16.7 MeV) boson which\ncould explain the anomalous excess of $e^+e^-$ pairs observed in the excited\n8Be nucleus decays ("Berillium anomaly") are reported. Due to its coupling to\nelectro…

Dark Matter Search in Missing Energy Events with NA64 Open

D. Banerjee, V.E. Burtsev, А. Г. Чумаков, D. Cooke, P. Crivelli , et al. · 2019

A search for sub-GeV dark matter production mediated by a new vector boson A^{'}, called a dark photon, is performed by the NA64 experiment in missing energy events from 100 GeV electron interactions in an active beam dump at the CERN SPS.…

Search for a Hypothetical 16.7 MeV Gauge Boson and Dark Photons in the NA64 Experiment at CERN Open

D. Banerjee, V.E. Burtsev, А. Г. Чумаков, D. Cooke, P. Crivelli , et al. · 2018

We report the first results on a direct search for a new 16.7 MeV boson (X) which could explain the anomalous excess of e^{+}e^{-} pairs observed in the excited ^{8}Be^{*} nucleus decays. Because of its coupling to electrons, the X could b…

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