V. O. Tikhomirov
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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: Searching for Light Dark Matter and Dark Sectors with the NA64 experiment at the CERN SPS
Searching for Light Dark Matter and Dark Sectors with the NA64 experiment at the CERN SPS Open
Since its approval in 2016, NA64 has pioneered light dark matter (LDM) searches with electron, positron, muon, and hadron beams. The experiment has successfully met its primary objectives, as outlined in the EPPS input (2018), and even exc…
View article: Development of the interaction trigger system for study of nucleus – nucleus collisions at BM@N/NICA experiment
Development of the interaction trigger system for study of nucleus – nucleus collisions at BM@N/NICA experiment Open
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: Dark-Sector Search via Pion-Produced <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>η</mml:mi></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>η</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math> Mesons Decaying Invisibly in the NA64h Detector
Dark-Sector Search via Pion-Produced and Mesons Decaying Invisibly in the NA64h Detector Open
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…
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 constraints on the Lμ − Lτ explanation of the muon g-2 anomaly from NA64-e at CERN
First constraints on the Lμ − Lτ explanation of the muon g-2 anomaly from NA64-e at CERN Open
View article: 50 GeV $π^-$ in, nothing out: a sensitive probe of invisible $η$ and $η'$ decays with NA64h
50 GeV $π^-$ in, nothing out: a sensitive probe of invisible $η$ and $η'$ decays with NA64h Open
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 …
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: 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: Measurement of the intrinsic hadronic contamination in the NA64<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.svg" display="inline" id="d1e670"><mml:mrow><mml:mo>−</mml:mo><mml:mi>e</mml:mi></mml:mrow></mml:math> high-purity <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si3.svg" display="inline" id="d1e678"><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:mo>/</mml:mo><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math> beam at CERN
Measurement of the intrinsic hadronic contamination in the NA64 high-purity beam at CERN Open
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 …
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: Measurement of the intrinsic hadronic contamination in the NA64$-e$ high-purity $e^+/e^-$ beam at CERN
Measurement of the intrinsic hadronic contamination in the NA64$-e$ high-purity $e^+/e^-$ beam at CERN Open
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…
View article: Search for a New <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi><mml:mo>−</mml:mo><mml:mi>L</mml:mi></mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>Z</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math> Gauge Boson with the NA64 Experiment at CERN
Search for a New Gauge Boson with the NA64 Experiment at CERN Open
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…
View article: Search for a light <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>Z</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math> in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>L</mml:mi><mml:mi>μ</mml:mi></mml:msub><mml:mo>−</mml:mo><mml:msub><mml:mi>L</mml:mi><mml:mi>τ</mml:mi></mml:msub></mml:math> scenario with the NA64-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>e</mml:mi></mml:math> experiment at CERN
Search for a light in the scenario with the NA64- experiment at CERN Open
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…
View article: Search for a New B-L Z' Gauge Boson with the NA64 Experiment at CERN
Search for a New B-L Z' Gauge Boson with the NA64 Experiment at CERN Open
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 dat…
View article: Search for pseudoscalar bosons decaying into <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> pairs in the NA64 experiment at the CERN SPS
Search for pseudoscalar bosons decaying into pairs in the NA64 experiment at the CERN SPS Open
We report the results of a search for a light pseudoscalar particle $a$ that\ncouples to electrons and decays to $e^+e^-$ performed using the high-energy\nCERN SPS H4 electron beam. If such pseudoscalar with a mass $\\simeq 17$ MeV\nexists…
View article: Improved exclusion limit for light dark matter from <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> annihilation in NA64
Improved exclusion limit for light dark matter from 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 ${A}^{\ensuremath{'}}$ were set by the NA64 experiment for the mass region ${m}_{{A}^{\ensuremath{'}}}\en…
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
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: A concept of the transition radiation detector for a hadron separation in a forward direction of the LHC experiments
A concept of the transition radiation detector for a hadron separation in a forward direction of the LHC experiments Open
Studying of hadron production in forward direction at the LHC energy has a great interest both for understanding of the fundamental QCD processes and also in applied areas such as the description of ultra-high energy cosmic particle intera…
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 $$^8$$ B…