Search Results - "Lysan, V"
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Dark Matter Search in Missing Energy Events with NA64
Published in Physical review letters (20-09-2019)“…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…”
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2
Search for Axionlike and Scalar Particles with the NA64 Experiment
Published in Physical review letters (21-08-2020)“…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…”
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3
Search for a Hypothetical 16.7 MeV Gauge Boson and Dark Photons in the NA64 Experiment at CERN
Published in Physical review letters (08-06-2018)“…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…”
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4
Search for Invisible Decays of Sub-GeV Dark Photons in Missing-Energy Events at the CERN SPS
Published in Physical review letters (06-01-2017)“…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…”
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5
Constraints on New Physics in Electron g − 2 from a Search for Invisible Decays of a Scalar, Pseudoscalar, Vector, and Axial Vector
Published in Physical review letters (28-05-2021)“…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…”
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6
Search for a New B − L Z ′ Gauge Boson with the NA64 Experiment at CERN
Published in Physical review letters (14-10-2022)Get full text
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Search for Light Dark Matter with NA64 at CERN
Published in Physical review letters (20-10-2023)“…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…”
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8
Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel
Published in The European physical journal. C, Particles and fields (01-10-2021)“…We report the results of a search for a new vector boson ( A ′ ) decaying into two dark matter particles χ 1 χ 2 of different mass. The heavier χ 2 particle…”
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9
First Results in the Search for Dark Sectors at NA64 with the CERN SPS High Energy Muon Beam
Published in Physical review letters (24-05-2024)“…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…”
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10
Hunting down the X17 boson at the CERN SPS
Published in The European physical journal. C, Particles and fields (01-12-2020)“…Recently, the ATOMKI experiment has reported new evidence for the excess of e + e - events with a mass ∼ 17 MeV in the nuclear transitions of 4 He, that they…”
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11
First constraints on the Lμ− Lτ explanation of the muon g-2 anomaly from NA64-e at CERN
Published in The journal of high energy physics (23-07-2024)“…A bstract 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…”
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12
Measurement of the intrinsic hadronic contamination in the NA64−e high-purity e+/e− beam at CERN
Published in Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment (01-12-2023)“…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…”
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13
Observation of K+→π+π0π0γ decay
Published in The European physical journal. C, Particles and fields (01-04-2024)“…The K + → π + π 0 π 0 γ decay is observed by the OKA collaboration. About 60 events of the decay observed with signal:noise ≈ 1 . The branching ratio obtained…”
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14
Searches for the light invisible axion-like particle in K+→π+π0a decay
Published in The European physical journal. C, Particles and fields (13-03-2024)“…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…”
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15
High purity 100 GeV electron identification with synchrotron radiation
Published in Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment (11-09-2017)“…In high energy experiments such as active beam dump searches for rare decays and missing energy events, the beam purity is a crucial parameter. In this paper…”
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16
Performance of Multiplexed XY Resistive Micromegas detectors in a high intensity beam
Published in Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment (11-02-2018)“…We present the performance of multiplexed XY resistive Micromegas detectors tested in the CERN SPS 100 GeV/c electron beam at intensities up to…”
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17
Study of K+→π0e+νγ decay with OKA setup
Published in The European physical journal. C, Particles and fields (01-02-2021)“…Results of a study of the K + → π 0 e + ν γ decay at OKA setup are presented. More than 32,000 events of this decay are observed. The differential spectra over…”
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18
Stability study and time resolution measurement of straw tube detectors
Published in Pramāṇa (2021)“…Straw tube detectors are single wire proportional counters that are widely used as tracking devices. We have carried out R&D activity with a straw tube…”
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Measurement of the T-Odd Correlation in the K+ → π0e+νeγ Radiative Decay at the OKA Setup
Published in JETP letters (2022)“…The T -odd correlation , which is the mixed product of the momenta of , , and γ in the system of rest of the kaon divided by , has been measured in the K + → π…”
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20
Straw Chambers for the NA64 Experiment
Published in Physics of particles and nuclei letters (01-11-2019)“…The aim of this work is to describe the characteristics and properties of the particle-tracking detectors created at the Joint Institute for Nuclear Research…”
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