Physics of Particles and Nuclei Letters最新文献

In the paper, a theoretical model describing the power spectra of synchrotron radiation of relativistic electrons in a synthetic turbulent magnetic field has been presented. A numerical calculation of the full power spectra of synchrotron radiation in a turbulent field generated by the harmonic method has been performed, and a model sky picture demonstrating the structure of the spatial inhomogeneity of the synchrotron radiation power distribution for an observer has been constructed. A wavelet analysis and multipole expansion in spherical harmonics have been used to analyze the angular structure. The results confirm the effectiveness of the approach for studying the magnetic field structure in experimental data.

Muon tomography leverages cosmic muons’ exceptional penetration capabilities to reconstruct detailed tomographic images via multiple Coulomb scattering interactions, making it invaluable for detecting High-Z materials critical to homeland security. This study introduces the slope intercept (SI) algorithm, a novel approach for rapid and precise tomographic image reconstruction. Implemented using Geant4 simulations in a standard-sized container tomography station, SI demonstrates superior performance in speed and simplicity compared to traditional methods. While the imaging results of SI and the point of closest approach (POCA) algorithm are nearly identical, the SI algorithm is simpler to implement, requires shorter CPU time, and exhibits a smaller margin of error. Its computational efficiency and simplicity make it a robust alternative to the POCA algorithm. These findings highlight SI’s suitability for applications demanding robust imaging and efficient data processing, which are crucial for advancing security measures and scientific research.

Within the gauge-theoretic approach of gravity, the gauging of an enlarged symmetry of the tangent space in four dimensions allows gravity to be unified with internal interactions. We study the unification of the conformal and noncommutative (fuzzy) gravities with internal interactions based on the (SO(10)) GUT.

We review some recent developments in 1st order GLSM construction, or so-called Gross–Neveu formalism for sigma models. We recall the general idea behind this framework and describe a 1st order GLSM data from which the general generalized Gross–Neveu model can be constructed, using (mathbb{C}{{mathbb{P}}^{{n - 1}}}) sigma model as simplest example. Then, we formulate a general statement that answers the question of which generalized Gross–Neveu models are equivalent to sigma models on compact homogeneous Hermitian spaces of classical groups endowed with the normal metrics.

In this article we obtained the four-loop β-function in N = 1 SQED with ({{N}_{{text{f}}}}) flavours regularized by higher derivatives using a special method of calculating vacuum supergraphs. To obtain contributions to the β-function from vacuum graphs we used a C++ computer program. Final result was compared with the anomalous dimension in previous order calculated earlier.

The α-shape factor of the real epithermal neutron spectrum, characterized by the 1/E^{1+ α} dependence, at the sample irradiation positions of the neutron production chamber installed at the IREN facility, was experimentally determined using the dual monitor method based on cadmium ratios. Two monitor sets, consisting of gold and copper foils, were employed for the determination of the α-shape factor. A revised equation for the determination of the α-shape factor was derived, which explicitly accounts for the effects of thermal and epithermal neutron self-shielding, as well as cadmium transmission of epithermal neutrons, in a logical and transparent manner. The arrangement of the correction factors for these effects in our proposed equation differs from that in the equations commonly used by other authors. The α-shape factor obtained using the proposed equation was compared with those calculated using several alternative equations employed by other research groups. The discrepancies observed among the values of the α-shape factor determined by solving different equations indicate that the placement of the correction factors within the equation significantly affects the result. Therefore, particular attention should be paid to this aspect when applying the dual monitor method for determining the α-shape factor.

We discus one-loop divergencies of the effective action in six-dimensional higher-derivative hypermultiplet model coupled with the external gauge background.

In this paper, we discuss the Yang–Baxter deformation as a method to explore gauge field theories through supergravity. Previous results in the development of this formalism for bivector deformations are provided, along with its advantages and challenges in the context of holography. We also present some results and conclusions from the development of the formalism for polyvector deformations in Type IIB backgrounds with block diagonal metrics and non-vanishing self-dual 5-form RR field strengths.

A methodology for assessing the efficiency and systematic error of the trigger system efficiency when selecting collision events (the main interaction trigger) is presented. It is found that an important factor leading to a decrease in the trigger efficiency is the passage of two or more beam ions within the trigger response time interval. A method for selecting events for analysis is proposed, which allows reducing the influence of this factor and saving event statistics. The parameters of various trigger elements are shown to vary during the entire session.