The link between ordinary Standard Model (SM) photons and both dark photons and axion-like particles (ALPs) can be introduced through the dark axion portal coupling. Given the dark axion portal setup, in the present p...
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The link between ordinary Standard Model (SM) photons and both dark photons and axion-like particles (ALPs) can be introduced through the dark axion portal coupling. Given the dark axion portal setup, in the present paper we refer to the dark photon as the mediator between SM and dark matter (DM) particles, implying that it decays predominantly into a pair of DM fermions. Furthermore, we discuss in detail the implication of the dark axion portal scenario for the lepton (electron and muon) fixed-target experiments. In particular, for the specific fixed-target facility we study the missing-energy signatures of the dark photon production followed by its invisible decay into stable DM particles. We investigate the potential to probe dark axion portal vertices with regarding signatures and derive the expected sensitivities of NA64e, NA64μ, LDMX and M3. Moreover, we estimate the expected reach of NA64e from the projected statistics of the J/ψ vector meson invisible decays. We also recast the BABAR monophoton bounds for the specific dark axion portal scenario. In addition, we modify the dark axion portal setup by including in the model both the hadron- and lepton-specific ALP couplings. As a result, we obtain the bounds on the combination of fermion-specific couplings of ALP from the fixed-target experiments. We discuss the implication of the modified dark axion portal scenario for the electric dipole moments (EDMs) of SM fermions. In addition, we derive novel constraints on the combination of the CP-violating neutron-specific ALP couplings from the existing bounds on neutron EDMs by taking into account the neutron anomalous magnetic moment.
The report addresses the application of ADSkit approach and related software tool for creating agent-based models describing the technical state dynamics of unique mechanical systems (UMS)s. UMSs are manufactured in v...
The report addresses the application of ADSkit approach and related software tool for creating agent-based models describing the technical state dynamics of unique mechanical systems (UMS)s. UMSs are manufactured in very few copies and furthermore the conditions of their exploitation can significantly diverse from each other. Also as a part of complex technical systems, UMS implements extreme technological operations. The step by step description of the ABSM development process for UMS is considered in the paper. In particular, the UMS ontology acts as a main source for model entities interpretation whereas their behavior mostly described in a rule-based or workflow manner. The testing simulations are carried out based on the ADSkit functionality related to the computational experiment management tool.
The data collected during various kinds of scientific research may be represented both by well known binary file formats and by custom formats specially developed for some unique device. While thorough understanding o...
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Sequences of Genocchi numbers of the first and second kind are considered. For these numbers, an approach based on their representation using sequences of polynomials is developed. Based on this approach, for these nu...
This article discusses the implementation of the basic components of spatial data infrastructure for the implementation of interdisciplinary research. The main purpose of the components is to provide a common platform...
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Under consideration is the problem of stability of switched discrete systems with the generalized homogeneous right-hand sides. The conditions are obtained for the existence of the common Lyapunov function, and a meth...
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The paper presents a problem formulation for the development of a theoretical and software framework for creating systems of data extraction from arbitrary spreadsheet tables. The problem covers the tasks of the autom...
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Charged wave packets with non-Gaussian spatial profiles are shown to possess intrinsic multipole moments. The magnetic dipole moment and the electric quadrupole moment are found for a wide class of packets, including ...
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Charged wave packets with non-Gaussian spatial profiles are shown to possess intrinsic multipole moments. The magnetic dipole moment and the electric quadrupole moment are found for a wide class of packets, including the vortex electrons with orbital angular momentum ℓ, the Airy beams, the so-called Schrödinger-cat states, and their generalizations. For the packets with no phase vortices, the electric quadrupole moment is shown to grow quadratically with the packet's width |Qαβ|∼eσ⊥2, while it is also |ℓ| times enhanced for the vortex beams. For available beams of electron microscopes, these multipole moments are relatively easily adjusted and can be quite large, which affects the packets' electromagnetic fields and also allows one to develop new diagnostic tools for materials science, atomic and molecular physics, nuclear physics, and so forth.
Nowadays geoportals provide some geospatial tools as services, usually implemented using the WPS standard. In this paper geoportal main principles are observed and existing methods and present technologies of classifi...
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