V. Lysan
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View article: Proof of principle for a light dark matter search with low-energy positron beams at NA64
Proof of principle for a light dark matter search with low-energy positron beams at NA64 Open
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…
View article: High efficiency veto hadron calorimeter in the NA64 experiment at CERN
High efficiency veto hadron calorimeter in the NA64 experiment at CERN Open
NA64 is a fixed-target experiment at the CERN SPS designed to search for Light particle Dark Matter (LDM) candidates with masses in the sub-GeV range. During the 2016-2022 runs, the experiment obtained the world-leading constraints, leavin…
View article: Proof of principle for a light dark matter search with low-energy positron beams at NA64
Proof of principle for a light dark matter search with low-energy positron beams at NA64 Open
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…
View article: Shedding light on dark sectors with high-energy muons at the NA64 experiment at the CERN SPS
Shedding light on dark sectors with high-energy muons at the NA64 experiment at the CERN SPS Open
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…
View article: Shedding light on Dark Sectors with high-energy muons at the NA64 experiment at the CERN SPS
Shedding light on Dark Sectors with high-energy muons at the NA64 experiment at the CERN SPS Open
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…
View article: First Results in the Search for Dark Sectors at NA64 with the CERN SPS High Energy Muon Beam
First Results in the Search for Dark Sectors at NA64 with the CERN SPS High Energy Muon Beam Open
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 …
View article: First constraints on the $L_μ-L_τ$ explanation of the muon $g-2$ anomaly from NA64-$e$ at CERN
First constraints on the $L_μ-L_τ$ explanation of the muon $g-2$ anomaly from NA64-$e$ at CERN Open
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…
View article: Searches for the light invisible axion-like particle in $$K^{+} \rightarrow \pi ^{+}\pi ^{0} a$$ decay
Searches for the light invisible axion-like particle in $$K^{+} \rightarrow \pi ^{+}\pi ^{0} a$$ decay Open
A high-statistics data sample of the $$K^{+}$$ decays is recorded by the OKA collaboration. A missing mass analysis is performed to search for a light invisible pseudoscalar axion-like particle (ALP) a in the decay $$K^{+} \rightarrow …
View article: Probing light dark matter with positron beams at NA64
Probing light dark matter with positron beams at NA64 Open
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…
View article: Exploration of the Muon $g-2$ and Light Dark Matter explanations in NA64 with the CERN SPS high energy muon beam
Exploration of the Muon $g-2$ and Light Dark Matter explanations in NA64 with the CERN SPS high energy muon beam Open
We report on a search for a new $Z'$ ($L_μ-L_τ$) 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 …
View article: Search for Light Dark Matter with NA64 at CERN
Search for Light Dark Matter with NA64 at CERN Open
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…
View article: Probing Light Dark Matter with positron beams at NA64
Probing Light Dark Matter with positron beams at NA64 Open
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…
View article: Search for Light Dark Matter with NA64 at CERN
Search for Light Dark Matter with NA64 at CERN Open
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…
View article: Improved exclusion limit for light dark matter from $e^+e^-$ annihilation in NA64
Improved exclusion limit for light dark matter from $e^+e^-$ annihilation in NA64 Open
The current most stringent constraints for the existence of sub-GeV dark matter coupling to Standard Model via a massive vector boson $A^\prime$ were set by the NA64 experiment for the mass region $m_{A^\prime}\lesssim 250$ MeV, by analyzi…
View article: Constraints on New Physics in Electron <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>g</mml:mi><mml:mo>−</mml:mo><mml:mn>2</mml:mn></mml:math> from a Search for Invisible Decays of a Scalar, Pseudoscalar, Vector, and Axial Vector
Constraints on New Physics in Electron from a Search for Invisible Decays of a Scalar, Pseudoscalar, Vector, and Axial Vector Open
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…
View article: Search for pseudoscalar bosons decaying into $e^+e^-$ pairs
Search for pseudoscalar bosons decaying into $e^+e^-$ pairs Open
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…
View article: Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel
Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel Open
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…
View article: Hunting down the X17 boson at the CERN SPS
Hunting down the X17 boson at the CERN SPS Open
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…
View article: Search for Axionlike and Scalar Particles with the NA64 Experiment
Search for Axionlike and Scalar Particles with the NA64 Experiment Open
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…
View article: Search for scalar and axionlike particles with the NA64 experiment
Search for scalar and axionlike particles with the NA64 experiment Open
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…
View article: Dark Matter Search in Missing Energy Events with NA64
Dark Matter Search in Missing Energy Events with NA64 Open
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.…
View article: Measurement of the $$K^+\rightarrow {\mu ^+}{\nu _{\mu }}{\gamma }$$ decay form factors in the OKA experiment
Measurement of the $$K^+\rightarrow {\mu ^+}{\nu _{\mu }}{\gamma }$$ decay form factors in the OKA experiment Open
A precise measurement of the vector and axial-vector form factors difference\n$F_V-F_A$ in the $K^+\\rightarrow{\\mu^+}{\\nu_{\\mu}}{\\gamma}$ decay is presented.\nAbout 95K events of $K^+\\rightarrow{\\mu^+}{\\nu_{\\mu}}{\\gamma}$ are sel…
View article: Search for a Hypothetical 16.7 MeV Gauge Boson and Dark Photons in the NA64 Experiment at CERN
Search for a Hypothetical 16.7 MeV Gauge Boson and Dark Photons in the NA64 Experiment at CERN Open
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…
View article: Search for vector mediator of dark matter production in invisible decay mode
Search for vector mediator of dark matter production in invisible decay mode Open
A search is performed for a new sub-GeV vector boson (A′) mediated production of dark matter (χ) in the fixed-target experiment, NA64, at the CERN SPS. The A′, called dark photon, can be generated in the reaction e-Z→e-ZA′ of 100 GeV elect…
View article: Search for a new X(16.7) boson and dark photons in the NA64 experiment at CERN
Search for a new X(16.7) boson and dark photons in the NA64 experiment at CERN Open
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 8Be* nucleus decays. Due to its coupling to electrons, the X could be produced in th…
View article: Search for Invisible Decays of Sub-GeV Dark Photons in Missing-Energy Events at the CERN SPS
Search for Invisible Decays of Sub-GeV Dark Photons in Missing-Energy Events at the CERN SPS Open
We report on a direct search for sub-GeV dark photons (A^{'}), which might be produced in the reaction e^{-}Z→e^{-}ZA^{'} via kinetic mixing with photons by 100 GeV electrons incident on an active target in the NA64 experiment at the CERN …