A. A. Osipov
A5000854985- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Theoretical and Computational Physics
- Dark Matter and Cosmic Phenomena
- Nonlinear Waves and Solitons
- Algebraic structures and combinatorial models
- Cosmology and Gravitation Theories
- Physics of Superconductivity and Magnetism
- Neutrino Physics Research
- Advanced Topics in Algebra
- Quantum chaos and dynamical systems
- Pulsars and Gravitational Waves Research
- Atomic and Subatomic Physics Research
- Noncommutative and Quantum Gravity Theories
- High-pressure geophysics and materials
- Molecular spectroscopy and chirality
- Experimental and Theoretical Physics Studies
- Nuclear reactor physics and engineering
- Quantum, superfluid, helium dynamics
- Spectral Theory in Mathematical Physics
- Algebraic and Geometric Analysis
- Particle accelerators and beam dynamics
- Stochastic processes and statistical mechanics
Joint Institute for Nuclear Research
2011-2024
Budker Institute of Nuclear Physics
2011-2023
Novosibirsk State University
2015-2022
Institute of Modern Physics
2018-2019
Chinese Academy of Sciences
2018-2019
University of Coimbra
2008-2018
Universidad de Salamanca
2018
Laboratoire de Physique Théorique
1992
Dubna State University
1991
Institute for Nuclear Research
1989-1991
It is shown that $U(3)_L\times U(3)_R$ eight-quark interactions stabilize the asymmetric ground state of well-known model with four-quark Nambu -- Jona-Lasinio and six-quark 't Hooft interactions. The result remains when reduced SU(3) f\mbox{}lavour symmetry explicitly broken by general current quark mass term $\hat{m}_u\neq\hat{m}_d\neq\hat{m}_s$.
Using the KEDR detector at VEPP-4M $e^+e^-$ collider, we have measured values of $R_{\text{uds}}$ and $R$ seven points center-of-mass energy between 3.12 3.72 GeV. The total achieved accuracy is about or better than $3.3\%$ most with a systematic uncertainty $2.1\%$. At moment it accurate measurement $R(s)$ in this range.
It is shown that the end point of first-order transition line, which merges into a crossover regime in phase diagram Nambu--Jona-Lasinio model, extended to include six-quark 't Hooft and eight-quark interaction Lagrangians, pushed toward vanishing chemical potential higher temperatures with increasing strength Okubo-Zweig-Iizuka--violating interactions. We clarify connection between location mechanism chiral symmetry breaking at quark level. show how $8q$ interactions affect number effective...
We present the analysis of all KEDR data on determination J/ψ and ψ(2S) masses. The comprise six scans seven which were performed at VEPP-4M e+e− collider in 2002–2008. beam energy was determined using resonance depolarization method. detector accelerator conditions during very different that increases reliability averaged results. accounts for partial correlations systematic uncertainties following mass values obtained:MJ/ψ=3096.900±0.002±0.006 MeV,Mψ(2S)=3686.099±0.004±0.009 MeV. These...
Using the KEDR detector at VEPP-4M $e^+e^-$ collider, we have determined values of $R$ thirteen points center-of-mass energy between 1.84 and 3.05 GeV. The achieved accuracy is about or better than $3.9\%$ most with a systematic uncertainty less $2.4\%$.
We report the final results of a study ψ(3770) meson using data sample collected with KEDR detector at VEPP-4M electron–positron collider. The analysis takes into account interference between resonant and nonresonant DD¯ production, where latter is related to part energy-dependent form factor FD. vector dominance approach several empirical parameterizations have been tried for FDNR(s). Our mass total width areM=3779.2−1.7+1.8−0.7+0.5−0.3+0.3MeV,Γ=24.9−4.0+4.6−0.6+0.5−0.9+0.2MeV, first,...
A high-precision determination of the main parameters \psi(2S) resonance has been performed with KEDR detector at VEPP-4M e^{+}e^{-} collider in three scans -- \psi(3770) energy range. Fitting dependence multihadron cross section vicinity we obtained mass value M = 3686.114 +- 0.007 0.011 ^{+0.002}_{-0.012} MeV and product electron partial width by branching fraction into hadrons \Gamma_{ee}*B_{h} 2.233 0.015 0.037 0.020 keV. The third error quoted is an estimate model result due to...
In a long distance Lagrangian approach to the low lying meson phenomenology, we present and discuss most general spin zero multiquark interaction vertices of nonderivative type which include set effective interactions proportional current quark masses, breaking explicitly chiral $SU(3{)}_{L}\ifmmode\times\else\texttimes\fi{}SU(3{)}_{R}$ ${U}_{A}(1)$ symmetries. These are same order in ${N}_{c}$, counting as 't Hooft flavor determinant eight extend original four Lagrangian, leading Nambu...
It is shown that a first order transition associated with jump in the strange quark mass appears generalized 3 flavour Nambu--Jona-Lasinio (NJL) treatment of matter. The generalization Lagrangian displays complete set spin 0 interactions at leading and subleading orders (LO NLO) $\frac{1}{N_c}$counting, including recently derived NLO explicit chiral symmetry breaking which are same as 't Hooft determinant. parameters model tightly constrained by low energy characteristics both pseudoscalar...
The present work continues a series of the KEDR measurements $R$ value that started in 2010 at VEPP-4M $e^+e^-$ collider. By combining new data with our previous results this energy range we measured values $R_{\text{uds}}$ and nine center-of-mass energies between 3.08 3.72 GeV. total accuracy is about or better than $2.6\%$ most points systematic uncertainty $1.9\%$. Together precise measurement 1.84-3.05 GeV, it constitutes detailed high-precision near charmonium production threshold.
Using the inclusive photon spectrum based on a data sample collected at $J/\psi$ peak with KEDR detector VEPP-4M $e^+e^-$ collider, we measured rate of radiative decay $J/\psi\to\gamma\eta_{\rm c}$ as well $\eta_{\rm mass and width. Taking into account an asymmetric lineshape obtained $\Gamma^0_{\gamma\eta_{\rm c}}=2.98\pm0.18 \phantom{|}^{+0.15}_{-0.33}$ keV, $M_{\eta_{\rm c}} = 2983.5 \pm 1.4 \phantom{|}^{+1.6}_{-3.6}$ MeV/$c^2$, $\Gamma_{\eta_{\rm 27.2 3.1 \phantom{|}^{+5.4}_{-2.6}$ MeV.
It is shown that eight-quark interactions, which are needed to stabilize the ground state of combined three flavor Nambu–Jona-Lasinio and 't Hooft Lagrangians, play also an important role in determining critical temperature at transitions occur from dynamically broken chiral phase symmetric phase.
It is shown that flavor mixing of the strange and light quarks allows for existence a much larger baryonic chemical potential window formation stable dual chiral-wave state as compared to well known two case. In addition, strangeness catalyzes occurrence new branch non-homogeneous solutions at moderate densities. This case study addressed zero temperature within SU(3) Nambu-Jona-Lasinio model with 't Hooft determinantal interaction. The modulation chiral condensates in quark sector taken be...
The result of removing heavy non-equal mass particles from the theory can be described, at low energy, by effective action, which is a series in inverse-square powers mass. We propose new efficient tool to calculate leading terms this based on Schwinger proper-time method. Unequal masses give rise large number vertices describing explicit flavor symmetry breaking effects with well-defined coupling constants. Our method pertinent and spontaneous chiral breaking, gauge theory, standard beyond...
We present a derivation of the low-energy effective meson Lagrangian Nambu -- Jona-Lasinio (NJL) model on basis Schwinger's proper-time regularization one-loop fermion determinant. consider case in which $SU(2)\times SU(2)$ chiral symmetry NJL is broken by current quark mass matrix with $\hat{m}_u\ne\hat{m}_d$. The non-degeneracy $d$ and $u$ masses destroys one most crucial features expansion chiral-invariant structure Seeley DeWitt coefficients. show however that systematic resummations...
A new mathematical framework for the diagonalization of nondiagonal vector--scalar and axial-vector--pseudoscalar mixing in effective meson Lagrangian is described. This procedure has unexpected connections with Hadamard product $n\times n$ matrices describing couplings, masses, fields involved. The approach shown to be much more efficient as compared standard methods employed previously. difference especially noticeable if chiral symmetry broken explicitly. paper ends an illustrative...
We work out the low-energy expansion of anomalous ${f}_{1}(1285)\ensuremath{\rightarrow}\ensuremath{\rho}\ensuremath{\gamma}$ decay amplitude by using Nambu--Jona-Lasinio model with $U(2)\ifmmode\times\else\texttimes\fi{}U(2)$ chiral symmetric four-quark interactions in one-quark-loop approximation. The related processes ${f}_{1}(1285)\ensuremath{\rightarrow}\ensuremath{\omega}\ensuremath{\gamma}$, ${a}_{1}(1260)\ensuremath{\rightarrow}\ensuremath{\omega}\ensuremath{\gamma}$, and...