F.V. Ignatov
A5017197868- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Computational Physics and Python Applications
- Medical Imaging Techniques and Applications
- Muon and positron interactions and applications
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Distributed and Parallel Computing Systems
- Astrophysics and Cosmic Phenomena
- Radiation Therapy and Dosimetry
- Advanced Data Storage Technologies
- Advanced X-ray and CT Imaging
- Cosmology and Gravitation Theories
- Nuclear Physics and Applications
- Radiomics and Machine Learning in Medical Imaging
- COVID-19 diagnosis using AI
- Black Holes and Theoretical Physics
- Life Cycle Costing Analysis
- Information Systems and Technology Applications
Novosibirsk State University
2014-2024
Budker Institute of Nuclear Physics
2015-2024
Siberian Branch of the Russian Academy of Sciences
2015-2024
University of Liverpool
2023-2024
Moscow Institute of Physics and Technology
2023
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2020
Novosibirsk State Technical University
2017
University of Victoria
2017
Russian Academy of Sciences
2008-2015
Yale University
2004
We review the present status of Standard Model calculation anomalous magnetic moment muon. This is performed in a perturbative expansion fine-structure constant $\alpha$ and broken down into pure QED, electroweak, hadronic contributions. The QED contribution by far largest has been evaluated up to including $\mathcal{O}(\alpha^5)$ with negligible numerical uncertainty. electroweak suppressed $(m_\mu/M_W)^2$ only shows at level seventh significant digit. It two loops known better than one...
The final results of the search for lepton flavour violating decay $$\mathrm {\mu }^+ \rightarrow \mathrm {e}^+ {\gamma }$$ based on full dataset collected by MEG experiment at Paul Scherrer Institut in period 2009–2013 and totalling $$7.5\times 10^{14}$$ stopped muons target are presented. No significant excess events is observed with respect to expected background a new upper limit branching ratio this $$ \mathcal{B} (\mu ^+ \mathrm{e}^+ \gamma ) < 4.2 \times 10^{-13}$$ (90 % confidence...
The analysis of a combined data set, totaling 3.6 × 10(14) stopped muons on target, in the search for lepton flavor violating decay μ(+) → e(+)γ is presented. collected by MEG experiment at Paul Scherrer Institut show no excess events compared to background expectations and yield new upper limit branching ratio this 5.7 10(-13) (90% confidence level). This represents four times more stringent than previous world best set MEG.
The MEG experiment, designed to search for the mu+->e+ gamma decay at a 10^-13 sensitivity level, completed data taking in 2013. In order increase reach of experiment by an magnitude level 6 x 10-14 branching ratio, total upgrade, involving substantial changes has been undertaken, known as II. We present both motivation upgrade and detailed overview design expected detector performance.
We present a new result based on an analysis of the data collected by MEG detector at Paul Scherrer Institut in 2009 and 2010, search lepton-flavor-violating decay μ+→e+γ. The likelihood combined sample, which corresponds to total 1.8×1014 muon decays, gives 90% C.L. upper limit 2.4×10−12 branching ratio μ+→e+γ decay, constituting most stringent existence this date.Received 31 July 2011DOI:https://doi.org/10.1103/PhysRevLett.107.171801© 2011 American Physical Society
The cross section of the process <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msup><a:mi>e</a:mi><a:mo>+</a:mo></a:msup><a:msup><a:mi>e</a:mi><a:mo>−</a:mo></a:msup><a:mo stretchy="false">→</a:mo><a:msup><a:mi>π</a:mi><a:mo>+</a:mo></a:msup><a:msup><a:mi>π</a:mi><a:mo>−</a:mo></a:msup></a:math> has been measured in center mass energy range from 0.32 to 1.2 GeV with CMD-3 detector at electron-positron collider VEPP-2000. measurement is based on a full dataset...
The cross section of the process <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msup><a:mi>e</a:mi><a:mo>+</a:mo></a:msup><a:msup><a:mi>e</a:mi><a:mo>−</a:mo></a:msup><a:mo stretchy="false">→</a:mo><a:msup><a:mi>π</a:mi><a:mo>+</a:mo></a:msup><a:msup><a:mi>π</a:mi><a:mo>−</a:mo></a:msup></a:math> has been measured in center-of-mass energy range from 0.32 to 1.2 GeV with CMD-3 detector at electron-positron collider VEPP-2000. measurement is based on an integrated...
Abstract The MEG II experiment, based at the Paul Scherrer Institut in Switzerland, reports result of a search for decay $$\upmu ^+ \rightarrow {\textrm{e}}^+ \upgamma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mtext>e</mml:mtext> </mml:mrow> <mml:mi>γ</mml:mi> </mml:math> from data taken first physics run 2021. No excess events over expected background is observed, yielding an...
The cross-section of the process e+e−→π+π− has been measured using about 11 4000 events collected by CMD-2 detector at VEPP-2M e+e− collider in center-of-mass energy range from 0.61 to 0.96 GeV. Results pion form factor determination with a 0.6% systematic uncertainty are presented. following values ρ- and ω-meson parameters were found: Mρ=(776.09±0.81) MeV, Γρ=(144.46±1.55) Γ(ρ→e+e−)=(6.86±0.12) keV, Br(ω→π+π−)=(1.33±0.25)%. Implications for hadronic contribution muon anomalous magnetic...
The MEG (Mu to Electron Gamma) experiment has been running at the Paul Scherrer Institut (PSI), Switzerland since 2008 search for decay μ +→e+ γ by using one of most intense continuous + beams in world. This paper presents components: positron spectrometer, including a thin target, superconducting magnet, set drift chambers measuring muon vertex and momentum, timing counter time, liquid xenon detector photon energy, position time. trigger system, read-out electronics data acquisition system...
The cross section of the process $e^+e^-\to\pi^+\pi^-$ has been measured in center mass energy range from 0.32 to 1.2 GeV with CMD-3 detector at electron-positron collider VEPP-2000. measurement is based on a full dataset collected below 1 during three data taking seasons, corresponding an integrated luminosity about 62 pb$^{-1}$. In dominant $\rho$-resonance region, systematic uncertainty 0.7% reached. At energies around $\phi$-resonance $\pi^+\pi^-$ production was for first time high beam...
Abstract 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 $$\upmu ^+ \rightarrow {\textrm{e}}^+ \upgamma $$ <mml:math...
Using a data sample of 6.8 pb$^{-1}$ collected with the CMD-3 detector at VEPP-2000 $e^+e^-$ collider we select about 2700 events $e^+e^- \to p\bar{p}$ process and measure its cross section 12 energy ponts 6\% systematic uncertainty. From angular distribution produced nucleons obtain ratio $|G_{E}/G_{M}| = 1.49 \pm 0.23 0.30$.
The Technical Design for the COMET Phase-I experiment is presented in this paper. an at J-PARC, Japan, which will search neutrinoless conversion of muons into electrons field aluminium nucleus ($\mu-e$ conversion, $\mu^- N \to e^- N$); a lepton flavor violating process. experimental sensitivity goal process $3.1\times10^{-15}$, or 90 % upper limit branching ratio $7\times 10^{-15}$, factor 100 improvement over existing limit. expected number background events 0.032. To achieve target and...
The MEG experiment took data at the Paul Scherrer Institute in years 2009–2013 to test violation of lepton flavor conservation law, which originates from an accidental symmetry that Standard Model elementary particle physics has, and published most stringent limit on charged violating decay μ+→e+γ: BR(μ+→e+γ) <4.2×10−13 90% confidence level. detector has been upgraded order reach a sensitivity 6×10−14. basic principle II is achieve highest possible using full muon beam intensity (7×107...
Abstract The cylindrical drift chamber is the most innovative part of MEG II detector, upgraded version experiment. differs from one because it a single volume structure, instead segmented one, chosen to improve its resolutions and efficiency in detecting low energy positrons muon decays at rest. In this paper, we show characteristics performances fundamental apparatus discuss impact higher resolution on sensitivity Because structure high quality will be cornerstone development an ideal...
The cross section of the process e+e−→3(π+π−) has been measured using a data sample 22pb−1 collected with CMD-3 detector at VEPP-2000 e+e− collider. 7956 signal events are selected in center-of-mass energy range 1.5–2.0 GeV. exhibits sharp drop near pp¯ threshold. A first study dynamics six-pion production performed.
The $e^+ e^- \to K^0_{S}K^0_{L}$ cross section has been measured in the center-of-mass energy range 1004--1060 MeV at 25 points using $6.1 \times 10^5$ events with $K^0_{S}\to π^+π^-$ decay. analysis is based on 5.9 pb$^{-1}$ of an integrated luminosity collected CMD-3 detector VEPP-2000 e^-$ collider. To obtain $ϕ(1020)$ meson parameters approximated according to Vector Meson Dominance model as a sum $ρ, ω, ϕ$-like amplitudes and their excitations. This most precise measurement 1.8\%...