A. Yu. Polyarush
A5084513269- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Neutrino Physics Research
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Superconducting Materials and Applications
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Quantum, superfluid, helium dynamics
- Cosmology and Gravitation Theories
- Spacecraft and Cryogenic Technologies
- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
- Magnetic confinement fusion research
- Computer Graphics and Visualization Techniques
- Labour Market and Migration
- Pulsars and Gravitational Waves Research
- Nuclear and radioactivity studies
- Particle accelerators and beam dynamics
- Image Enhancement Techniques
Institute for Nuclear Research
2013-2024
Joint Institute for Nuclear Research
2017
University of Calabria
2000-2011
Russian Academy of Sciences
2001-2008
University of South Carolina
2000
Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
2000
Australian Nuclear Science and Technology Organisation
2000
Roma Tre University
2000
University of Perugia
2000
Institute for High Energy Physics
1977-1990
The decay K−→π0μ−ν has been studied using in-flight decays detected with the "STRA+" spectrometer. About 540K events were collected for analysis. λ+ and λ0 slope parameters of form-factors f+(t), f0(t) have measured: λ+=0.0277±0.0013(stat)±0.0009(syst), λ0=0.0183±0.0011(stat)±0.0006(syst), dλ0/dλ+=−0.348. limits on possible tensor scalar couplings derived: fT/f+(0)=−0.0007±0.0071, fS/f+(0)=0.0017±0.0014. No visible non-linearity in observed.
A high statistics data sample of the $$K^{+}\rightarrow \mu ^{+}\nu _{\mu }$$ decay was accumulated by OKA experiment in 2012. The missing mass analysis performed to search for channel _{H}$$ with a hypothetic stable heavy neutrino final state. obtained spectrum does not show peaks that could be attributed existence neutrinos range $$(270< m_{\nu _{H}} < 375)$$ MeV $$/c^{2}$$ . As result, upper limits on branching ratio and value mixing element $$|U_{\mu H}|^{2}$$ are obtained.
Results of a study the $K^+ \rightarrow \pi^{0} e^{+} \nu \gamma $ decay at OKA setup are presented. More than 32000 events this observed. The differential spectra over photon energy and photon-electron opening angle in kaon rest frame branching ratios, normalized to that $K_{e3}$ calculated for different cuts $E^*_\gamma$ $cos\Theta^{*}_{e\gamma}$. In particular, ratio $E^{*}_{\gamma}>30$ MeV $\Theta^{*}_{e \gamma}>20^{\circ}$ is measured R = $\frac{Br(K^+ \nu_{e} \gamma) } {Br(K^+...
The radiative decay K->mu nu gamma has been studied at ISTRA+ setup in a new kinematical region. About 22K events of K^- -> mu^- nu_mu have observed. sign and value Fv-Fa measured for the first time. result is Fv-Fa=0.21(4)(4).
The Dalitz plot slope parameters g, h and k for the K−→π0π0π− decay have been measured using in-flight decays detected with ISTRA+ setup operating in 25 GeV negative secondary beam of U-70 PS. About 252 K events four-momenta π− four involved photons were used analysis. values obtained g=0.627±0.004(stat)±0.010(syst), h=0.046±0.004(stat)±0.012(syst), k=0.001±0.001(stat)±0.002(syst) are consistent world averages dominated by K+ data, but significantly smaller errors.
A precise measurement of the vector and axial-vector form factors difference $F_V-F_A$ in $K^+\rightarrow{\mu^+}{\nu_{\mu}}{\gamma}$ decay is presented. About 95K events are selected OKA experiment. The result $F_V-F_A=0.134\pm0.021(stat)\pm0.027(syst)$. Both errors smaller than previous measurements.
A search for the light pseudoscalar sgoldstino production in three-body K− decay K−→π−π0P has been performed with "ISTRA+" detector exposed to 25 GeV/c negative secondary beam of U-70 proton synchrotron. No signal is observed. An upper limit branching ratio Br(K−→π−π0P), at 90% confidence level, determined be ∼9×10−6 effective mass mP range from 0 200 MeV/c2, excluding region near mπ0 where it degrades ∼3.5×10−5.