B. Shwartz
A5023174295- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Nuclear physics research studies
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- Radiation Detection and Scintillator Technologies
- Superconducting Materials and Applications
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Advanced NMR Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Atomic and Molecular Physics
- Superconducting and THz Device Technology
- Advanced Semiconductor Detectors and Materials
- Muon and positron interactions and applications
- Calibration and Measurement Techniques
- Experimental and Theoretical Physics Studies
Budker Institute of Nuclear Physics
2015-2024
Novosibirsk State University
2015-2024
Children’s Discovery Museum of San Jose
2023
Siberian Branch of the Russian Academy of Sciences
2013-2022
University of the Basque Country
2013-2022
University of Bonn
2013-2022
Chonnam National University
2018-2022
Duke University
2022
Campbell Collaboration
2012-2022
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
2020
This article reports world averages of measurements $b$-hadron, $c$-hadron, and $\tau$-lepton properties obtained by the Heavy Flavor Averaging Group using results available through summer 2016. For averaging, common input parameters used in various analyses are adjusted (rescaled) to values, known correlations taken into account. The include branching fractions, lifetimes, neutral meson mixing parameters, \CP~violation semileptonic decays CKM matrix elements.
This article reports world averages for measurements of b-hadron, c-hadron, and tau-lepton properties obtained by the Heavy Flavor Averaging Group (HFAG) using results available at least through end 2009. Some presented use data spring 2010. For averaging, common input parameters used in various analyses are adjusted (rescaled) to values, known correlations taken into account. The include branching fractions, lifetimes, neutral meson mixing parameters, CP violation semileptonic decays.
The ABC effect-a puzzling low-mass enhancement in the pipi invariant mass spectrum, first observed by Abashian, Booth, and Crowe-is well known from inclusive measurements of two-pion production nuclear fusion reactions. Here we report on exclusive kinematically complete most basic double-pionic reaction pn-->dpi;{0}pi;{0} at beam energies 1.03 1.35 GeV. measurements, which have been carried out CELSIUS-WASA, reveal effect to be a (pipi)_{I=L=0} channel phenomenon associated with both...
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...
We report the results of a search for charmonium-like state produced in process gamma --> omega J/psi 3.9-4.2 GeV/c^2 mass region. observe significant enhancement, which is well-described by resonant shape with M = (3915 +/- 3 2) MeV/c^2 and total width Gamma (17 10 3) MeV. This enhancement may be related to one or more three states so far reported 3.90-3.95
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 $|G_{E}/G_{M}| = 1.49 \pm 0.23 0.30$.
Exclusive measurements of the quasi-free $np \to np\pi^0\pi^0$ reaction have been performed by means $dp$ collisions at $T_d$ = 2.27 GeV using WASA detector setup COSY. Total and differential cross sections obtained covering energy region $\sqrt s$ (2.35 - 2.46) GeV, which includes ABC effect its associated $d^*(2380)$ resonance. Adding $d^*$ resonance amplitude to that for conventional processes leads a reasonable description data. The observed in total section is agreement with predictions...
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\%...
The process $e^+e^- \to K^+K^-\pi^+\pi^-$ has been studied in the center-of-mass energy range from 1500 to 2000\,MeV using a data sample of 23 pb$^{-1}$ collected with CMD-3 detector at VEPP-2000 $e^+e^-$ collider. Using about 24000 selected events, cross section measured systematic uncertainty decreasing 11.7\% 1500-1600\,MeV 6.1\% above 1800\,MeV. A preliminary study $K^+K^-\pi^+\pi^-$ production dynamics performed.
We report on a high-statistics measurement of the most basic double pionic fusion reaction $\vec{n}p \to d\pi^0\pi^0$ over energy region $d^*(2380)$ resonance by use polarized deuteron beam and observing in quasifree scattering mode. The measurements were performed with WASA detector setup at COSY. data reveal substantial analyzing powers confirm conclusions about $d^*$ obtained from unpolarized measurements. also previous under complementary kinematic conditions.
The process $e^+e^- \to K^+K^-$ has been studied using $1.7 \times 10^6$ events from a data sample corresponding to an integrated luminosity of 5.7 pb$^{-1}$ collected with the CMD-3 detector in center-of-mass energy range 1010--1060 MeV. cross section measured about 2\% systematic uncertainty and it is used calculate contribution anomalous magnetic moment muon $a_μ^{K^+K^-} = (19.33 \pm 0.40) 10^{-10}$, obtain $ϕ(1020)$ meson parameters. We consider relationship between K^0_SK^0_L$ sections...
The cross section of the process e+e−→π+π−π0 has been measured in c.m. energy range 984–1060 MeV with CMD-2 detector at VEPP-2M collider. obtained value Br(ϕ→e+e−)Br(ϕ→π+π−π0)=(4.51±0.16±0.11)×10−5 is good agreement previous measurements and best accuracy. Analysis Dalitz plot was performed. contributions dominant ϕ→ρπ mechanism as well a small direct ϕ→3π amplitude were determined.