Multivortex Solutions of the Weierstrass Representation

The connection between the complex Sine and Sinh-Gordon equations on the complex plane associated with a Weierstrass type system and the possibility of construction of several classes of multivortex solutions is discussed in detail. We perform the Painlev\'e test and analyse the possibility of deriving the B\"acklund transformation from the singularity analysis of the complex Sine-Gordon equation. We make use of the analysis using the known relations for the Painlev\'{e} equations to construct explicit formulae in terms of the Umemura polynomials which are $\tau$-functions for rational solutions of the third Painlev\'{e} equation. New classes of multivortex solutions of a Weierstrass system are obtained through the use of this proposed procedure. Some physical applications are mentioned in the area of the vortex Higgs model when the complex Sine-Gordon equation is reduced to coupled Riccati equations.Comment: 27 pages LaTeX2e, 1 encapsulated Postscript figur

Test beam studies of the TRD prototype filled with different gas mixtures based on Xe, Kr, and Ar

Towards the end of LHC Run1, gas leaks were observed in some parts of the Transition Radiation Tracker (TRT) of ATLAS. Due to these leaks, primary Xenon based gas mixture was replaced with Argon based mixture in various parts. Test-beam studies with a dedicated Transition Radiation Detector (TRD) prototype were carried out in 2015 in order to understand transition radiation performance with mixtures based on Argon and Krypton. We present and discuss the results of these test-beam studies with different active gas compositions.Comment: 5 pages,12 figures, The 2nd International Conference on Particle Physics and Astrophysics (ICPPA-2016); Acknowledgments section correcte

Some results of test beam studies of Transition Radiation Detector prototypes at CERN

Operating conditions and challenging demands of present and future accelerator experiments result in new requirements on detector systems. There are many ongoing activities aimed to develop new technologies and to improve the properties of detectors based on existing technologies. Our work is dedicated to development of Transition Radiation Detectors (TRD) suitable for different applications. In this paper results obtained in beam tests at SPS accelerator at CERN with the TRD prototype based on straw technology are presented. TRD performance was studied as a function of thickness of the transition radiation radiator and working gas mixture pressure

Analysis of nucleus-nucleus collisions at high energies and Random Matrix Theory

We propose a novel statistical approach to the analysis of experimental data obtained in nucleus-nucleus collisions at high energies which borrows from methods developed within the context of Random Matrix Theory. It is applied to the detection of correlations in momentum distributions of emitted particles. We find good agreement between the results obtained in this way and a standard analysis based on the method of effective mass spectra and two-pair correlation function often used in high energy physics. The method introduced here is free from unwanted background contributions.Comment: 11 pages, 10 figure

Three-body decay of the d* dibaryon

Under certain circumstances, a three-body decay width can be approximated by an integral involving a product of two off-shell two-body decay widths. This ``angle-average'' approximation is used to calculate the $\pi NN$ decay width of the $d^*(J^\pi=3^+, T=0)$ dibaryon in a simple $\Delta^2$ model for the most important Feynman diagrams describing pion emissions with baryon-baryon recoil and meson retardation. The decay width is found to be about 0.006 (0.07, 0.5) MeV at the $d^*$ mass of 2065 (2100, 2150) MeV for input dynamics derived from the Full Bonn potential. The smallness of this width is qualitatively understood as the result of the three-body decay being ``third forbidden''. The concept of $\ell$ forbiddenness and the threshold behavior of a three-body decay are further studied in connection with the $\pi NN$ decay of the dibaryon $d'(J^\pi=0^-, T=0 or 2)$ where the idea of unfavorness has to be introduced. The implications of these results are briefly discussed.Comment: 15 pages, RevTeX, two-column journal style, six figure

Identification of particles with Lorentz factor up to 10410^{4} with Transition Radiation Detectors based on micro-strip silicon detectors

This work is dedicated to the study of a technique for hadron identification in the TeV momentum range, based on the simultaneous measurement of the energies and of the emission angles of the Transition Radiation (TR) X-rays with respect to the radiating particles. A detector setup has been built and tested with particles in a wide range of Lorentz factors (from about $10^3$ to about $4 \times 10^4$ crossing different types of radiators. The measured double-differential (in energy and angle) spectra of the TR photons are in a reasonably good agreement with TR simulation predictions.Comment: 31 pages, 12 figures, paper published on Nuclear Instruments & Methods

Current Issues in Terminology and Classification of Hereditary Disorders at Endocrine Cancer

Significant interest in the problem of genetic oncological diseases is due to an increase in the frequency of their detection, existing difficulties of early recognition, disagreements in the clinical and morphological criteria for diagnosis and evaluation of prognostic factors, the absence of generally accepted standards of treatment and objective assessment of their results.The introduction of new diagnostic technologies into clinical practice (molecular genetic studies, the ability to determine a wide range of hormones and peptides, immunohistochemical determination of general and specific markers, modern methods of topical diagnostics, etc.) allowed us to identify a specific genetic substrate of various types of endocrine organ tumors, previously unknown nosological forms, improve the ability to predict the disease on the preclinical level, to assess their place and importance in the structure of general oncopathology.The issues of terminology, classification, criteria for the degree of malignancy and prognostic factors of hereditary endocrine diseases are particularly relevant. The article presents and analyzes the modern classification and terminological definitions of this group of diseases. The problem of hereditary endocrine tumor diseases and syndromes associated with neuroendocrine tumors (NETs) and multiple endocrine neoplasia syndromes (MEN-syndromes) has been described. In conclusion, the situation with the study of this problem in the Russian Federation is analyzed

Association of cardiovascular biomarkers with myocardial and coronary imaging characteristics in patients having acute myocardial infarction and type 2 diabetes mellitus

Aim. To assess the dynamic changes and clinical significance of biomarkers of inflammatory processes in patients with acute myocardial infarction (MI) with/ or without type 2 diabetes mellitus (T2DM) and primary percutaneous coronary intervention (pPCI) at various stages of treatment.Methods. 96 patients with acute MI after pPCI were examined. The level of inflammation markers was measured 4 times: before pPCI (first day from admission to the hospital), on the third day, 7–10 days (before discharge from the hospital) and 40–45 days after pPCI.Results. All groups of patients with MI showed an increase in the plasma activity of biomarkers of inflammatory processes. After pPCI for 40–45 days, there is a significant difference in the concentration of biomarkers, depending on the comorbid T2DM presence. Strong associations were found between cardiovascular biomarkers and post-MI cardiac remodeling and coronary atherosclerosis progression.Conclusion. The assessment of the levels of biomarkers of inflammatory processes may have additional clinical value in estimating the course of MI, including patients with T2DM at the postinfarction stages. Aim. To assess the dynamic changes and clinical significance of biomarkers of inflammatory processes in patients with acute myocardial infarction (MI) with/ or without type 2 diabetes mellitus (T2DM) and primary percutaneous coronary intervention (pPCI) at various stages of treatment.Methods. 96 patients with acute MI after pPCI were examined. The level of inflammation markers was measured 4 times: before pPCI (first day from admission to the hospital), on the third day, 7–10 days (before discharge from the hospital) and 40–45 days after pPCI.Results. All groups of patients with MI showed an increase in the plasma activity of biomarkers of inflammatory processes. After pPCI for 40–45 days, there is a significant difference in the concentration of biomarkers, depending on the comorbid T2DM presence. Strong associations were found between cardiovascular biomarkers and post-MI cardiac remodeling and coronary atherosclerosis progression.Conclusion. The assessment of the levels of biomarkers of inflammatory processes may have additional clinical value in estimating the course of MI, including patients with T2DM at the postinfarction stages.

A concept of the transition radiation detector for a hadron separation in a forward direction of the LHC experiments

Studying of hadron production in forward direction at the LHC energy has a great interest both for understanding of the fundamental QCD processes and also in applied areas such as the description of ultra-high energy cosmic particle interactions. The energies of secondary hadrons in such studies almost reach the maximum energy available at the LHC of ∼6 TeV, which corresponds to a Lorentz γ-factor up to 104 and above. The only effective technique able to identify particles in this range is based on the transition radiation detectors (TRD). Prototypes of such kind of detector were built and tested at the CERN SPS accelerator. Some experimental results obtained in these tests are briefly presented here and compared with Monte Carlo (MC) simulations. MC model demonstrates a good agreement with the experiment. On this basis a concept of a full-scale TRD optimized for the hadron identification in the TeV energy region is proposed. Different particle identification techniques were considered and examined. The expected detector performance to reconstruct secondary hadrons produced in forward direction at the LHC is presented

Test beam studies of possibilities to separate particles with gamma factors above 10\u3csup\u3e3\u3c/sup\u3e with straw based Transition Radiation Detector

Measurements of hadron production in the TeV energy range are one of the tasks of the future studies at the Large Hadron Collider (LHC). The main goal of these experiments is a study of the fundamental QCD processes at this energy range, which is very important not only for probing of the Standard Model but also for ultrahigh-energy cosmic particle physics. One of the key elements of these experiments measurements are hadron identification. The only detector technology which has a potential ability to separate hadrons in this energy range is Transition Radiation Detector (TRD) technology. TRD prototype based on straw proportional chambers combined with a specially assembled radiator has been tested at the CERN SPS accelerator beam. The test beam results and comparison with detailed Monte Carlo simulations are presented here