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Deep inelastic e−τ and μ−τ conversion in the NA64 experiment at the CERN SPS

Physical Review D 2018年第1期98卷 015007-015007页

作者： Sergei Gninenko Sergey Kovalenko Serguei Kuleshov Valery E. Lyubovitskij Alexey S. Zhevlakov Institute for Nuclear Research 117312 Moscow Russia Departamento de Física y Centro Científico Tecnológico de Valparaíso-CCTVal Universidad Técnica Federico Santa María Casilla 110-V Valparaíso Chile Institut für Theoretische Physik Universität Tübingen Kepler Center for Astro and Particle Physics Auf der Morgenstelle 14 D-72076 Tübingen Germany Department of Physics Tomsk State University 634050 Tomsk Russia Tomsk State Pedagogical University 634061 Tomsk Russia Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontov str. 134 664033 Irkutsk Russia

We study the lepton flavor violating (LFV) e(μ)−τ conversion in deep inelastic scattering (DIS) of electrons (muons) on fixed-target nuclei. Our model-independent analysis is based on the set of low-energy effective four-fermion LFV operators composed of leptons and quarks with the corresponding mass scales Λk for each operator. Using the estimated sensitivity of the search for this LFV process in events with large missing energy in the NA64 experiment at the CERN SPS, we derive lower limits for Λk and compared them with the corresponding limits existing in the literature. We show that the DIS e(μ)−τ conversion is able to provide a plenty of new limits as yet nonexisting in the literature. We also analyzed the energy spectrum of the final-state τ and discussed the viability of the observation of this process in the NA64 experiment and ones akin to it. The case of polarized beams and targets is also discussed.

关键词： Particle interactions

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Pauli form factor of quark and nontrivial topological structure of the QCD

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Physical Review D 2017年第5期96卷 054030-054030页

作者： Baiyang Zhang Andrey Radzhabov Nikolai Kochelev Pengming Zhang Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China University of Chinese Academy of Sciences Beijing 100049 China Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontov street 134 664033 Irkutsk Russia Bogoliubov Laboratory of Theoretical Physics Joint Institute for Nuclear Research Dubna Moscow Region 141980 Russia

We calculate the electromagnetic Pauli form factor of quark induced by the nontrivial topological fluctuations of QCD vacuum called instantons. It is shown that such a contribution is significant. We discuss the possible implications of our result in the photon-hadron reactions and in the dynamics of quark-photon interactions in the dense/hot quark matter.

关键词： Effective field theory Form factors Instantons Particle interactions Quark model

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Spin dynamics and magnetic field induced polarization of excitons in ultrathin GaAs/AlAs quantum wells with indirect band gap and type-II band alignment

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Physical Review B 2017年第3期96卷 035302-035302页

作者： T. S. Shamirzaev J. Rautert D. R. Yakovlev J. Debus A. Yu. Gornov M. M. Glazov E. L. Ivchenko M. Bayer Rzhanov Institute of Semiconductor Physics Siberian Branch of the Russian Academy of Sciences 630090 Novosibirsk Russia Ural Federal University 620002 Yekaterinburg Russia Experimentelle Physik 2 Technische Universität Dortmund 44227 Dortmund Germany Ioffe Institute Russian Academy of Sciences 194021 St. Petersburg Russia Institute for System Dynamics and Control Theory Siberian Branch of the Russian Academy of Sciences 664033 Irkutsk Russia

The exciton spin dynamics are investigated both experimentally and theoretically in two-monolayer-thick GaAs/AlAs quantum wells with an indirect band gap and a type-II band alignment. The magnetic field induced circular polarization of photoluminescence Pc is studied as function of the magnetic field strength and direction as well as sample temperature. The observed nonmonotonic behavior of these functions is provided by the interplay of bright and dark exciton states contributing to the emission. To interpret the experiment, we have developed a kinetic master equation model which accounts for the dynamics of the spin states in this exciton quartet, radiative and nonradiative recombination processes, and redistribution of excitons between these states as result of spin relaxation. The model offers quantitative agreement with experiment and allows us to evaluate, for the studied structure, the heavy-hole g factor, ghh=+3.5, and the spin relaxation times of electron, τse=33μs, and hole, τsh=3μs, bound in the exciton.

关键词： Electronic structure Excitons Luminescence Semiconductors Spin polarization Spin relaxation

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On the Construction of Triples of Diagonal Latin Squares of Order 10

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Electronic Notes in Discrete Mathematics 2016年 54卷 307-312页

作者： Zaikin, Oleg Zhuravlev, Alexey Kochemazov, Stepan Vatutin, Eduard Matrosov Institute for System Dynamics and Control Theory of SB RAS Irkutsk Russian Federation Internet-portal BOINC.ru Moscow Russian Federation Southwest State University Kursk Russian Federation

We provide a triple of diagonal Latin squares of order 10 that is the closest to being a triple of mutually orthogonal diagonal Latin squares found so far. It was obtained by constructing all orthogonal mates for diagonal Latin squares generated according to a specific scheme. We also show that a triple of mutually orthogonal diagonal Latin squares of order 10 cannot be constructed based on diagonal Latin squares from specific families. © 2016 Elsevier B.V.

关键词： diagonality Latin square orthogonality SAT

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Using grid systems for enumerating combinatorial objects on example of diagonal Latin squares 7

Using grid systems for enumerating combinatorial objects on ...

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7th International Conference Distributed Computing and Gridtechnologies in Science and Education, GRID 2016

作者： Vatutin, E.I. Zaikin, O.S. Zhuravlev, A.D. Manzyuk, M.O. Kochemazov, S.E. Titov, V.S. Southwest State University Kursk Russia Matrosov Institute for System Dynamics and Control Theory of SB RAS Irkutsk Russia Internet Portal BOINC.ru Moscow Russia

In this paper we consider the problem of enumerating diagonal Latin squares of small order. In particular we discuss possible algorithmic approaches to this problem and show our results in this regard. Surprisingly, our research showed that the best algorithm for enumerating diagonal Latin squares consists of a number of fixed loops, and its effectiveness can be significantly increased by careful tuning and applying special heuristics. We used the constructed algorithm to enumerate all diagonal Latin squares of order 8. Also, it is being used to carry out large-scale computational experiment aimed at enumeration of diagonal Latin squares of order 9. © 2016 Eduard I. Vatutin, Oleg S. Zaikin, Alexey D. Zhuravlev, Maxim O. Manzyuk, Stepan E. Kochemazov, Vitaliy S. Titov.

关键词： Combinatorial mathematics

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Deep inelastic e - τ and μ - τ conversion in the NA64 experiment at the CERN SPS

arXiv

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arXiv 2018年

作者： Gninenko, Sergei Kovalenko, Sergey Kuleshov, Serguei Lyubovitskij, Valery E. Zhevlakov, Alexey S. Institute for Nuclear Research Moscow117312 Russia Departamento de Fisica y Centro Científico Tecnológico de Valparaíso-CCTVal Universidad Técnica Federico Santa María Casilla110-V Chile Institut für Theoretische Physik Universität Tübingen Kepler Center for Astro and Particle Physics Auf der Morgenstelle 14 TübingenD-72076 Germany Department of Physics Tomsk State University Tomsk634050 Russia Tomsk State Pedagogical University Tomsk634061 Russia Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontov str. 134 Irkutsk664033 Russia

We study the Lepton Flavor Violating (LFV) e(μ) - τ conversion in Deep Inelastic Scattering (DIS) of electrons (muons) on fixed-target nuclei. Our model-independent analysis is based on the set of low-energy effective four-fermion LFV operators composed of leptons and quarks with the corresponding mass scales Λkfor each operator. Using the estimated sensitivity of the search for this LFV process in events with large missing energy in the NA64 experiment at the CERN SPS, we derive lower limits for Λkand compared them with the corresponding limits existing in the literature. We show that the DIS e(μ) - τ conversion is able to provide a plenty of new limits as yet nonexisting in the literature. We also analyzed the energy spectrum of the final-state τ and discussed the viability of the observation of this process in the NA64 experiment and ones akin to it. The case of polarized beams and targets is also discussed. Copyright © 2018, The Authors. All rights reserved.

关键词： Distribution functions

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Conceptual Model of Problem-oriented Heterogeneous Distributed Computing Environment with Multi-agent Management

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Procedia Computer Science 2017年 103卷 162-167页

作者： I. Bychkov G. Oparin A. Tchernykh A. Feoktistov V. Bogdanova S. Gorsky Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontov str. 134 Irkutsk Post Box 292 664033 Russia CICESE Research Center Computer Science Department Carretera Ensenada-Tijuana No. 3918 Zona Playitas Codigo Postal 22860 Apdo. Postal 360 Ensenada B.C. Mexico

One of the promising approaches to the efficient management in a heterogeneous distributed computing environment is the use of multi-agent systems. When researchers want to solve tasks in such an environment, they need utilities for the description of the processing in the specific domain, and knowledge about a software-hardware infrastructure. This multi-component knowledge is used for effective decision-making. Practice and experience of multi-agent systems show that knowledge representation is non-trivial problems. We proposed an approach to the design of the conceptual model of a heterogeneous distributed computing environment based on multi-agent management. An important component of the model is algorithmic knowledge, which provides the support of planning, resources allocation and dynamic decomposition of a problem to subproblems. This knowledge is represented as a semantic network, which describe semantic relations between concepts. Unlike to Semantic Web Services and Semantic Grids, our approach provides advanced planning abilities to support parallelism and scalability. We develop specialized high-level tools for designing and using the conceptual models.

关键词： multi-agent systems knowledge representation distributed computing environment.

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Stabilization of Multi-AUV formation with digital control

Stabilization of Multi-AUV formation with digital control

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International Convention on Information and Communication Technology, Electronics and Microelectronics

作者： S. A. Ul'yanov N. N. Maximkin Institute for System Dynamics and Control Theory / Department of Information Control Systems Irkutsk Russia

ISBN: (纸本)9781509025435

Formation stability problem for a team of autonomous underwater vehicles (AUV) with digital control is investigated. A leader-follower formation control algorithm for multi-AUV system is proposed. Feedback control signal for the follower, which is piecewise constant, is computed on the basis of discrete measurements of the distance and the bearing angle to the leader. A discrete observer for estimation of the derivatives of the distance and the bearing angle are used to improve the control performance. The parameters of the controller and observer are synthesized using a digital control system design method based on the vector Lyapunov functions that allows one to take into account the uncertainties of the plant, measurement errors, and control constraints. Numerical simulations are carried out to demonstrate the effectiveness of the proposed control scheme.

关键词： Observers Digital control Vehicle dynamics Stability analysis Feedback control Lyapunov methods

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A heat wave problem for a degenerate nonlinear parabolic equation with a specified source function

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AIP Conference Proceedings 2018年第1期2053卷

作者： A. L. Kazakov P. A. Kuznetsov L. F. Spevak 1Matrosov Institute for System Dynamics and Control Theory Siberian Branch of the Russian Academy of Sciences 134 Lermontova St. 664033 Irkutsk Russia 2Institute of Engineering Science Ural Branch of the Russian Academy of Sciences 34 Komsomolskaya St. 620049 Ekaterinburg Russia

A nonlinear parabolic heat conduction equation with a source is discussed, for which solutions of the heat wave propagating against a cold background at a finite velocity are studied. A new theorem of the existence and uniqueness of heat waves is proved. A particular case is studied in detail, when the heat wave is invariant and its construction reduces to solving an ordinary differential equation. For the numerical construction of invariant heat waves, an algorithm based on the boundary element method is proposed. Test examples are solved.

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Infrastructural approach and geospatial data processing services in the tasks of territorial development management

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IOP Conference Series: Earth and Environmental Science 2018年第1期190卷

作者： I V Bychkov G M Ruzhnikov V V Paramonov A S Shumilov R K Fedorov K G Levi S Demberel Siberian Branch of Russian Academy of Sciences Irkutsk Scientific Center Irkutsk Russia Matrosov Institute for System Dynamics and Control Theory of Siberian Branch of Russian Academy of Sciences Irkutsk Russia Institute of the Earth Crust of Siberian Branch of Russian Academy of Sciences Irkutsk Russia Institute of Astronomy and Geophysics of the Mongolian Academy of Sciences Ulaanbaatar Mongolia

The technology for creating an information and analytical environment (IAE) for spatial data processing based on the use of spatial data infrastructure (SDI) components and a service-oriented paradigm was proposed for the management of territorial development. The environment is characterized by its spatial nature and distribution of territorial information resources. At the same time, emphasis is placed on the transition from a standard SDI, as an access medium for the exchange of spatial data, to an SDI of an integration type, as an environment for access, exchange, creation, storage of new sets of spatial and thematic data and processing services. The use of Service-oriented Architecture (SOA), open standards by OGC (Open Geospatial Consortium), Web technologies, standardization of the browser's interface and Web services, allowed to move from local to distributed and 'cloud' computing in which information and computing resources are provided as Web services. The technology for creating an information and analytical environment involves the use of sets (combinations) of thematic Web services with standardized interfaces integrated with standard protocols (SOAP, WSDL, etc.).

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