N. Nikitin
A5079853539- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Particle Detector Development and Performance
- Laser-Plasma Interactions and Diagnostics
- Dark Matter and Cosmic Phenomena
- Laser Design and Applications
- Laser-induced spectroscopy and plasma
- Particle Accelerators and Free-Electron Lasers
- Laser-Matter Interactions and Applications
- Black Holes and Theoretical Physics
- Advanced Data Storage Technologies
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- Distributed and Parallel Computing Systems
- Radiation Detection and Scintillator Technologies
- Quantum Mechanics and Applications
- Computational Physics and Python Applications
- Atomic and Subatomic Physics Research
- Solid State Laser Technologies
- Optical Systems and Laser Technology
- Geomagnetism and Paleomagnetism Studies
- Quantum Information and Cryptography
- Laser Material Processing Techniques
European Organization for Nuclear Research
2004-2025
École Polytechnique Fédérale de Lausanne
2024-2025
Lomonosov Moscow State University
2013-2024
University of Zurich
2023-2024
Institute of Transport Engineering
2024
Institute for Nuclear Research
2023
Central Bank of the Russian Federation
2023
Kharkiv Institute of Physics and Technology
2023
Universitat de Barcelona
2023
Scientific Research Institute of Optoelectronic Instrumentation
1997-2022
We study long-distance effects in rare exclusive semileptonic decays $\stackrel{\ensuremath{\rightarrow}}{B}{(K,K}^{*})({\mathcal{l}}^{+}{\mathcal{l}}^{\ensuremath{-}},\ensuremath{\nu}\overline{\ensuremath{\nu}})$ and analyze dilepton spectra asymmetries within the framework of standard model. The form factors, describing meson transition amplitudes effective Hamiltonian, are calculated lattice-constrained dispersion quark model: factors given by representations through wave functions...
Recently a new class of time-dependent Bell inequalities in Wigner form was introduced. The structure the allows experimental studies quantum and open systems external fields. In this paper, we study properties using time evolution neutral pseudoscalar mesons with $CP$-violation effects taken into account. It is shown that it always possible to find range parameters test for violation an experimentally accessible area. effect relaxation large scales demonstrated.
The amplitude of the $\stackrel{\ensuremath{\rightarrow}}{B}\ensuremath{\rho}\ensuremath{\gamma}$ decay induced by flavor-changing neutral currents contains penguin contribution and weak annihilation generated 4-quark operators in effective Hamiltonian. is known quite well. We analyze which suppressed heavy-quark mass compared to contribution. In factorization approximation, represented terms leptonic constants meson-photon matrix elements currents. latter contain $B\ensuremath{\gamma},$...
The ATLAS High Level Trigger's (HLT) primary function of event selection will be accomplished with a Level-2 trigger farm and an filter (EF) farm, both running software components developed in the offline reconstruction framework. While this approach provides unified framework for selection, it poses strict requirements on critical trigger. A decision must typically within 10 ms multiple processing concurrent threads. To address these constraints, prototypes have been that incorporate...
We derive a class of time-dependent Bell inequalities in Wigner form under the assumption locality framework Kolmogorov's probability theory. consider violation obtained for three cases: spin correlations an external magnetic field, oscillations neutral pseudoscalar mesons, and decays into fermion-antifermion pair.
We propose a Wigner-like inequality suitable for testing the hypothesis of realism. show that this is identical neither to well-known Wigner nor Leggett-Garg in form. The obtained realism not only quantum mechanical systems, but also field systems. Also we mathematically consistent derivation form, which was recently presented literature, three and $n$ distinct moments time. Contrary these works, our rigor uses Kolmogorov axiomatics probability theory. pay special attention construction...
We obtain predictions for B(s) → e+e−γ and μ+μ−γ decays. All the contributions containing long-distance QCD effects are calculated in framework of relativistic quark model. The light vector-meson resonances related to virtual photon emission from valence quarks B-meson included. highest branching ratios radiative leptonic B-decays B(B̄0s e+e−γ) = 18.8×10−9 B(B0s μ+μ−γ) 12.2×10−9. also give distribution foward-backward asymmetry.
Following rigorous software design and analysis methods, an object-based architecture has been developed to derive the second- third-level trigger decisions for future ATLAS detector at LHC. The functional components within this system responsible generating elements of are algorithms running architecture. Relevant aspects reviewed along with concrete examples specific their performance in "vertical" slices various physics selection strategies.
The ATLAS trigger reduces the rate of interesting events to be recorded for off-line analysis in three successive levels from 40 MHz /spl sim/100 kHz, sim/2 kHz and sim/200 Hz. high level triggers data acquisition system are designed profit commodity computing networking components achieve required performance. In this paper, we discuss flow aspects design second (LVL2) present results performance measurements.
The Event Filter (EF) selection stage is a fundamental component of the ATLAS Trigger and Data Acquisition architecture. Its primary function reduction data flow rate to values acceptable by mass storage operations subsequent offline reconstruction analysis steps. computing instrument EF organized as set independent subfarms, each connected one output Builder (EB) switch fabric. Each subfarm comprises number processors analyzing several complete events in parallel. This paper describes...
The ATLAS combined test beam in the second half of 2004 saw first deployment High-Level Trigger (HLT). next steps are on pre-series farms experimental area during 2005, commissioning and cosmics tests with full detector 2006 collisions 2007. This paper reviews experience gained beam, describes current status discusses further enhancements to be made. We address issues related dataflow, integration selection algorithms, testing, software distribution, installation improvements.
In this paper we propose a time-independent \textit{equality} and time-dependent \textit{inequality}, suitable for an experimental test of the hypothesis realism. The derivation these relations is based on concept conditional probability Bayes' theorem in framework Kolmogorov's axiomatics theory. equality obtained intrinsically different from well known GHZ-equality its variants, because violation new might be tested experiments with only two microsystems maximally entangled Bell state...
During the runtime of any experiment, a central monitoring system that detects problems as soon they appear has an essential role. In large like ATLAS, online data acquisition is distributed across nodes farms, each them running several processes analyse fraction events. this architecture, it necessary to have process collects all from different nodes, produces full statistics histograms and analyses them. paper we present design such system, called gatherer. It allows collect object,...