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Implication of hidden sub-GeV bosons for the (g−2)μ, Be8−He4 anomaly, proton charge radius, EDM of fermions, and dark axion portal

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Physical Review D 2020年第9期102卷 095024-095024页

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

We discuss new physics phenomenology of hidden scalar (S), pseudoscalar (P), vector (V) and axial-vector (A) particles coupled to nucleons and leptons, which could give contributions to proton charge radius, (g−2)μ, Be8−He4 anomaly and electric dipole moment (EDM) of Standard Model (SM) particles. In particular, we estimate sensitivity of NA64μ experiment to observe muon missing energy events involving hidden scalar and vector particles. That analysis is based on geant4 Monte Carlo simulation of the signal process of muon scattering off target nuclei μN→μNS(V) followed by invisible boson decay into dark matter (DM) particles, S(V)→χχ. The existence of light sub-GeV bosons could possibly explain the muon (g−2) anomaly observed. We also summarize existing bounds on ATOMKI X17(JP=0−,1±) boson coupling with neutron, proton, and electron. We implement these constraints to estimate the contribution of P, V. and A particles to proton charge radius via direct 1-loop calculation of Sachs form factors. The analysis reveals the corresponding contribution is negligible. We also calculate bounds on dark axion portal couplings of dimension-five operators, which contribute to the EDMs of leptons and neutron.

关键词： Axions Composite models Electric moment Extensions of Higgs sector Extensions of gauge sector Form factors Magnetic moment Single-particle dynamics Parity Monte Carlo methods Nuclear structure & decays

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A Local Branching MIP Heuristic for a Real-World Curriculum-Based Course Timetabling Problem 18th

A Local Branching MIP Heuristic for a Real-World Curriculum-...

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18th International Conference on Mathematical Optimization theory and Operations Research, MOTOR 2019

作者： Avella, Pasquale Boccia, Maurizio Viglione, Sandro Vasilyev, Igor DING – Dipartimento di Ingegneria Università del Sannio Piazza Roma 21 Benevento82100 Italy DIETI – Dipartimento di Ingegneria Elettrica e delle Tecnologie dell’Informazione Universitá degli Studi di Napoli "Federico II" Naples Italy Matrosov Institute of System Dynamics and Control Theory Siberian Branch of Russian Academy of Sciences Lermontov str. 134 Irkutsk664033 Russia

ISBN: (纸本)9783030333935

Automated timetabling is a challenging area in the timetabling and scheduling theory and practice, intensively addressed in research papers in the last two decades. There are three main classes of problems, which are usually studied: school timetabling, course timetabling and examination timetabling. In this report, we address a case study of the Curriculum-Based Course Timetabling (CB-CTT) problem, arising at Engineering Department of Sannio University. In general, the problem consists of finding a feasible weekly assignment of course lectures to rooms and time periods while respecting a wide range of constraints, which have to be either strictly satisfied (hard constraints) or satisfied as much as possible (soft constraints). The case study here addressed here has many special requirements due to local organizational rules. We were able to model the complex requirements by an Integer Programming formulation. The solution approach consists of using an MIP solver, integrated with two local branching heuristics tailored for the problem. The effectiveness of the proposed approach is illustrated by the computational results on two real instances. © 2019, Springer Nature Switzerland AG.

关键词： Integer programming

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Deuteron EDM induced by CP violating couplings of pseudoscalar mesons

arXiv

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arXiv 2020年

作者： Zhevlakov, Alexey S. Lyubovitskij, Valery E. Department of Physics Tomsk State University Tomsk634050 Russia Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontov str. 134 Irkutsk664033 Russia Institut für Theoretische Physik Universität Tübingen Kepler Center for Astro and Particle Physics Auf der Morgenstelle 14 TübingenD-72076 Germany Departamento de Física y Centro Científico Tecnológico de Valparaíso-CCTVal Universidad Técnica Federico Santa María Casilla 110-V Valparaíso Chile

We analyze contributions to the electric dipole (EDM) and Schiff (SFM) moments of deuteron induced by the CP-violating three-pseudoscalar meson couplings using phenomenological Lagrangian approach involving nucleons and pseudoscalar mesons P = π, K, η, η0. Deuteron is considered as a proton-neutron bound state and its properties are defined by one- and two-body forces. One-body forces correspond to a picture there proton and neutron are quasi free constituents of deuteron and their contribution to the deuteron EDM (dEDM) is simply the sum of proton and neutron EDMs. Two-body forces in deuteron are induced by one-meson exchange between nucleons. They produce a contribution to the dEDM, which is estimated using corresponding potential approach. From numerical analysis of nucleon and deuteron EDMs we derive stringent limits on CP-violating hadronic couplings and θ¯ parameter. We showed that proposed measurements of proton and deuteron EDMs at level of ∼ 10−29 by the Store Ring EDM and JEDI Collaborations will provide more stringent upper limits on the CP violating parameters. Copyright © 2020, The Authors. All rights reserved.

关键词： Deuterium

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On cryptographic attacks using backdoors for SAT

arXiv

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arXiv 2018年

作者： Semenov, Alexander Zaikin, Oleg Otpuschennikov, Ilya Kochemazov, Stepan Ignatiev, Alexey Matrosov Institute for System Dynamics and Control Theory SB RAS Irkutsk Russia LASIGE Faculdade de Ciências Universidade de Lisboa Portugal

Propositional satisfiability (SAT) is at the nucleus of state-of-the-art approaches to a variety of computationally hard problems, one of which is cryptanalysis. Moreover, a number of practical applications of SAT can only be tackled efficiently by identifying and exploiting a subset of formula’s variables called backdoor set (or simply backdoors). This paper proposes a new class of backdoor sets for SAT used in the context of cryptographic attacks, namely guess-and-determine attacks. The idea is to identify the best set of backdoor variables subject to a statistically estimated hardness of the guess-and-determine attack using a SAT solver. Experimental results on weakened variants of the renowned encryption algorithms exhibit advantage of the proposed approach compared to the state of the art in terms of the estimated hardness of the resulting guess-and-determine attacks. Copyright © 2018, The Authors. All rights reserved.

关键词： Hardness

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An algorithm for packing circles of two types in a fixed size container with non-euclidean metric 6

An algorithm for packing circles of two types in a fixed siz...

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Supplementary 6th International Conference on Analysis of Images, Social Networks and Texts, AIST-SUP 2017

作者： Kazakov, Alexander L. Lempert, Anna A. Le, Quang Mung Matrosov Institute for System Dynamics and Control Theory SB RAS Irkutsk Russia Irkutsk National Research Technical University Irkutsk Russia

The paper deals with the problem of optimal packing of two sets of circles (2-D spheres) into a simply connected container. The number of circles is given. The radii of these circles are equal within each set, but, generally speaking, they differ between sets. There are two different statements of a such problem. The simplest one is when the circles of a larger radius are located first, and then smaller circles are packed into the gaps. Solving of a such problem, in fact, reduces to a two-fold solution of the equal circles packing problem. However, the procedure is complicated by the fact that in the second solution the container will be a multiply connected set. We consider a more complex formulation: it is required to maximize the radii of the circles when their ratio is fixed. The circle packing problem is usually studied in the case when the distance between points is Euclidean and even then belongs to the class of NP-hard problems. We assume that the distance is determined by means of some special metric, which, generally speaking, is not Euclidean. The special numerical algorithm is suggested and implemented. It based on optical-geometric approach, which is developed by the authors in recent years and previously used only for packing circles of equal radius. The results of computational experiment are presented and discussed.

关键词： Containers

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Tensor meson contribution to the Lamb shift and hyperfine splitting in muonic hydrogen

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Journal of Physics: Conference Series 2020年第1期1435卷

作者： A E Dorokhov A P Martynenko F A Martynenko A E Radzhabov Joint Institute of Nuclear Research BLTP 141980 Moscow region Dubna Russia Samara National Research University named after acad. S.P. Korolev 443086 Samara Russia Matrosov Institute for System Dynamics and Control Theory SB RAS 664033 Irkutsk Russia

We calculate the tensor meson exchange contribution to the interaction operator of muon and proton, which is determined by the tensor meson coupling with two photon state. For the construction of transition form factor T → γγ we use the monopole parametrization over photon four-momenta and experimental data on the decay width ΓTγγ. It is shown that tensor meson f2(1270) exchange gives essential contribution to the Lamb shift in muonic hydrogen ΔΕLs (2P – 2S) which should be taken into account for a comparison with precise experimental data.

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Precision adjustment of electromagnetic emitter of large-scale systems such as GLONASS

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IOP Conference Series: Materials Science and Engineering 2020年第1期760卷

作者： A V Banshchikov A V Daneev V A Rusanov A A Vetrov Matrosov Institute for System Dynamics and Control Theory of the Siberian Branch of the Russian Academy of Sciences 130 Lermontov ave. Irkutsk 664033 Russia Irkutsk State Transport University 15 Chernyshevskogo ave. 664074 Irkutsk Russia

The multidimensional nonlinear regression-tensor model is investigated in the substantiation of necessary and sufficient conditions for the optimal multi-factorial process of precision calibration of the parameters of the electromagnetic radiation source in the geostationary orbit (including the large-scale GLONASS system). A robust-adaptive strategy of a posteriori formation of the target functional of electromagnetic observability of a weighted-distributed signal in an established complex of stationary ground points is proposed on the basis of observations of this signal, made with a tolerance.

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Constraints on CP-odd ALP couplings from EDM limits of fermions.

arXiv

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arXiv 2020年

作者： Kirpichnikov, D.V. Lyubovitskij, Valery E. Zhevlakov, Alexey S. Institute for Nuclear Research of the Russian Academy of Sciences Moscow117312 Russia Institut für Theoretische Physik Universität Tübingen Kepler Center for Astro and Particle Physics Auf der Morgenstelle 14 TübingenD-72076 Germany Departamento de Física y Centro Científico Tecnológico de Valparaíso-CCTVal Universidad Técnica Federico Santa María Casilla 110-V Valparaíso Chile Department of Physics Tomsk State University Tomsk634050 Russia Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontov str. 134 Irkutsk664033 Russia

We discuss constraints on soft CP-violating couplings of axion-like particles (ALPs) with photon and fermions by using data on electric dipole moments (EDMs) of Standard Model (SM) particles. In particular, we derive bounds on CP-odd ALP-photon-photon coupling from data of the ACME Collaboration on electron EDM. We also discuss prospects of the Storage Ring experiment to constrain the ALP-photon-photon coupling from data on proton EDM. The regarding constraints from experimental bounds on the muon and neutron EDMs are weak. We set constraint on the CP-odd ALP coupling with electron and derive bounds on combinations of coupling constants, which involve soft CP-violating terms. Finally, we discuss a scenario of inducing of Yukawa-like interaction of SM fermions with ALP through the electro-weak symmetry breaking mechanism. Copyright © 2020, The Authors. All rights reserved.

关键词： Photons

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Necessary optimality condition with feedback controls for nonsmooth optimal impulsive control problems 8

Necessary optimality condition with feedback controls for no...

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8th International Conference on Optimization and Applications, OPTIMA 2017

作者： Sorokin, Stepan P. Staritsyn, Maxim V. Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontova St. 134 Irkutsk664033 Russia

The paper raises an optimal impulsive control problem with trajectories of bounded variation described by a nonsmooth measure differential equation. The addressed singular problem of dynamic optimization can be equivalently transformed to an ordinary terminally constrained optimal control problem of a specific structure. For the transformed problem, we present a new form of nonlocal necessary optimality condition. The condition, named the nonsmooth feedback maximum principle, operates with feedback inputs and performs the property of potential control improvement, while standing within standard objects of the nonsmooth maximum principle. A counter-positive version of the nonsmooth feedback maximum principle performs a conceptual iterative algorithm for optimal control, which can be used for numeric implementation of the optimal impulsive control problem. Since numeric analysis of the transformed model requires its discretization, a major portion of the paper is paid to a discrete-time counterpart of the transformed problem. For this class of optimization problems, a discrete-time version of a nonlocal necessary optimality condition is derived. Based on this optimality condition, an iterative numeric algorithm is developed. © Copyright by the paper's authors.

关键词： Maximum principle

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On a solution of fractional programs via D.C. optimization theory 8

On a solution of fractional programs via D.C. optimization t...

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8th International Conference on Optimization and Applications, OPTIMA 2017

作者： Gruzdeva, Tatiana V. Strekalovsky, Alexander S. Matrosov Institute for System Dynamics and Control Theory of SB RAS Lermontov str. 134 Irkutsk664033 Russia

This paper addresses the problems of fractional programming which data is given by d.c. functions. Such problems are, in general, nonconvex (with numerous local extrema). We develop an efficient global search method for fractional program based on two different approaches. The first approach develops the Dinkelbach's idea and uses a solution of an equation with the optimal value of an auxiliary d.c. optimization problem with a vector parameter. The second one deals with another auxiliary problem with nonconvex inequality constraints. Both auxiliary problems are d.c. optimization problems, which allows us to apply the Global Optimization theory and develop two corresponding global search algorithms. The algorithms have been substantiated and tested on an extended set of sum-of-ratios problems with up to 200 variables and 200 terms in the sum. Also we propose an algorithm for solving problems of fractional programming, which combines the two approaches. © Copyright by the paper's authors.

关键词： Global optimization

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