V. A. Baranov
A5101840511- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Historical and Religious Studies of Rome
- Particle Accelerators and Free-Electron Lasers
- Byzantine Studies and History
- Radioactive Decay and Measurement Techniques
- Medical Imaging Techniques and Applications
- Quantum and electron transport phenomena
- Spacecraft and Cryogenic Technologies
- Astro and Planetary Science
- Earthquake Detection and Analysis
- Advanced NMR Techniques and Applications
- Renaissance Literature and Culture
- Heat Transfer Mechanisms
- Muon and positron interactions and applications
- Superconducting Materials and Applications
- Heat Transfer and Optimization
- Electronic and Structural Properties of Oxides
- Physics of Superconductivity and Magnetism
Joint Institute for Nuclear Research
2008-2023
Kryachkov Novosibirsk State University of Architecture, Design and Arts
2021
University of Antwerp
2015
Paul Scherrer Institute
2009
National Centre for Nuclear Research
2009
Tbilisi State University
2009
University of Zurich
2009
Rudjer Boskovic Institute
2009
University of Virginia
2009
Dubna State University
1991
We present a new measurement of the positive muon magnetic anomaly, a_{μ}≡(g_{μ}-2)/2, from Fermilab Muon g-2 Experiment using data collected in 2019 and 2020. have analyzed more than 4 times number positrons decay our previous result 2018 data. The systematic error is reduced by factor 2 due to better running conditions, stable beam, improved knowledge field weighted distribution, ω[over ˜]_{p}^{'}, anomalous precession frequency corrected for beam dynamics effects, ω_{a}. From ratio...
Using a large acceptance calorimeter and stopped pion beam we have made precise measurement of the rare ${\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{e}^{+}\ensuremath{\nu}$ (${\ensuremath{\pi}}_{\ensuremath{\beta}}$) decay branching ratio. We evaluated ratio by normalizing number observed ${\ensuremath{\pi}}_{\ensuremath{\beta}}$ decays to ${\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{e}^{+}\ensuremath{\nu}$ (${\ensuremath{\pi}}_{e2}$) decays. find value...
The first dedicated search for the rare neutral-kaon decay $K_L^0\to\pi^0\nu\bar{\nu}$ has been carried out in E391a experiment at KEK 12-GeV proton synchrotron. final upper limit of 2.6 $\times 10^{-8}$ 90% confidence level was set on branching ratio decay.
We have measured the pi+-->e+ nugamma branching ratio over a wide region of phase space, based on total 65 460 events acquired using PIBETA detector. Minimum-chi2 fits to (E(e+), E(gamma) energy distributions result in weak form factor value F(A)=0.0119(1) with fixed F(V)=0.0259. An unconstrained fit yields F(V)=0.0258(17) and F(A)=0.0117(17). In addition, we a=0.10(6) for dependence F(V) q2, e+ nu pair invariant mass squared, parametrized as F(V)(q2)=F(V)(0)(1+aq(2)). The kinematic...
We have studied radiative pion decays pi(+)-->e(+)nugamma in three broad kinematic regions using the PIBETA detector and a stopped beam. Based on Dalitz distributions of 41 601 events we evaluated absolute pi-->enugamma branching ratios regions. Minimum chi(2) fits to integral differential (E(e(+)),E(gamma)) result axial-to-vector weak form factor ratio gamma identical with F(A)/F(V)=0.443(15), or F(A)=0.0115(4) F(V)=0.0259. However, deviations from standard model predictions...
We performed a search for the ${K}_{L}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ decay at KEK 12-GeV proton synchrotron. No candidate events were observed. An upper limit on branching ratio was set to be $6.7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ 90% confidence level.
We performed a search for light pseudoscalar particle $X$ in the decay $K_L^0->pi0pi0X$, $X->\gamma\gamma$ with E391a detector at KEK. Such mass of 214.3 MeV/$c^2$ was suggested by HyperCP experiment. found no evidence and set an upper limit on product branching ratio $2.4 \times 10^{-7}$ 90% confidence level. Upper limits ratios region from 194.3 to 219.3 are also presented.
The superconducting state in one-dimensional nanosystems is very delicate. While fluctuations of the phase wave function lead to spontaneous decay persistent supercurrents thin wires and nanocircuits, discrete phase-slip can also more exotic phenomena, such as appearance metastable states current-bearing wires. Here we show that switching between different δ-MoN nanowires be effectively manipulated by introducing small amplitude electrical noise. Furthermore, deterministic with numbers...
The MEG II experiment, based at the Paul Scherrer Institut in Switzerland, reports result of a search for decay $\mu^+\to e^+\gamma$ from data taken first physics run 2021. No excess events over expected background is observed, yielding an upper limit on branching ratio B($\mu^+\to e^+\gamma$) < $7.5 \times 10^{-13}$ (90% C.L.). combination this and obtained by gives $3.1 C.L.), which most stringent to date. A ten-fold larger sample being collected during years 2022-2023, data-taking will...
The first dedicated experiment for the rare kaon decay ${K}_{L}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ has been performed by E391a Collaboration at KEK 12-GeV proton synchrotron. A new upper limit of $2.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$ 90% confidence level was set branching ratio using about 10% data collected during period taking.
The rare decay K0(L) --> pi0 nu nu-bar was studied with the E391a detector at KEK 12-GeV proton synchrotron. Based on 9.4 x 10^9 K0L decays, an upper limit of 8.1 10^{-7} obtained for branching fraction 90% confidence level. We also set a X (X invisible particles) process; varied from 7.0 to 4.0 10^{-5} mass ranging 50 MeV/c^2 200 MeV/c^2.
Simple dynamics, few available decay channels, and highly controlled radiative loop corrections, make pion muon decays a sensitive means of exploring details the underlying symmetries. We review current status rare decays: π + → e ν (π e2 ), νγ e2γ 0 e3 [Formula: see text]. For latter we report new preliminary values for branching ratio B(E γ > 10 MeV , θ eγ 30°) = 4.365 (9) stat (42) syst × -3 parameter text], both in excellent agreement with standard model predictions. recent...
The MEG II experiment, located at the Paul Scherrer Institut (PSI) in Switzerland, is successor to which completed data taking 2013. started fully operational 2021, with goal of improving sensitivity mu+ -> e+ gamma decay down 6e-14 almost an order magnitude better than current limit. In this paper, we describe operation and performance experiment give a new estimate its versus acquisition time.
The first search for the rare kaon decay KL→π0π0ν¯ν has been performed by E391a collaboration at KEK 12-GeV proton synchrotron. An upper limit of 4.7×10−5 90% confidence level was set branching ratio using about 10% data collected during period taking. First limits mode KL→π0π0P, where P is a pseudoscalar particle, were also set.Received 31 January 2007DOI:https://doi.org/10.1103/PhysRevD.76.011101©2007 American Physical Society
We performed a search for the decay ${K}_{L}^{0}\ensuremath{\rightarrow}3\ensuremath{\gamma}$ with E391a detector at KEK. In data accumulated in 2005, no event was observed signal region. Based on assumption of proceeding via parity-violation, we obtained single sensitivity to be $(3.23\ifmmode\pm\else\textpm\fi{}0.14)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$, and set an upper limit branching ratio $7.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ 90% confidence...
A new measurement of Bπe2, the π+→e+ν(γ) decay branching ratio, is currently under way at Paul Scherrer Institute. The present experimental result on Bπe2 constitutes most accurate test lepton universality available. accuracy, however, still lags behind theoretical precision by over an order magnitude. Because large helicity suppression πe2 decay, its ratio susceptible to significant contributions from physics, making this a particularly suitable subject study.
Building on the rare pion and muon decay results of PIBETA experiment, PEN collaboration has undertaken a precise measurement B_{\pi e2} = R^\pi_{e/\mu}, \pi^+ -> e^+\nu(\gamma) branching ratio, at Paul Scherrer Institute, to reduce present 40\times experimental precision lag behind theory ~ 6-7\times. Because large helicity suppression, R^\pi_{e/\mu} is uniquely sensitive contributions from non-(V-A) physics, making this particularly suitable subject study. Even current precision, value...
With few open channels and uncomplicated theoretical description, charged pion decays are uniquely sensitive to certain standard model (SM) symmetries, the universality of weak fermion couplings, aspects structure chiral dynamics. We review current knowledge electronic decay $π^+ \to e^+ ν_e(γ)$, or $π_{e2(γ)}$, resulting limits on non-SM processes. Focusing PEN experiment at Paul Scherrer Institute (PSI), Switzerland, we examine prospects for further improvement in near term.
A search with the large solid angle spectrometer (ARES) for lepton-number-nonconserving decay mu + to e+e+e- has been carried out. Cylindrical multiwire proportional chambers and cylindrical scintillation hodoscopes were used. The upper limit branching ratio Gamma ( e+e+e-)/ e+ nu e )<or=3.6*10-11 (90% C.L.) derived.