Prospects of detecting massive isosinglet neutrino at LHC in the CMS detector

A possibility to search for a heavy isosinglet (sterile) neutrino using its decay mode $\nu_s \to l^{\pm} + 2 jets$ in the $S$ - channel production $pp \to W^* + X \to l^{\pm}\nu_s + X$ in the CMS experiment is studied. The only assumption about the heavy neutrino is its nonzero mixing with $\nu_e$ or $\nu_{\mu}$. The corresponding CMS discovery potential expressed in terms of the heavy neutrino mass and the mixing parameter between the heavy and light neutrino is determined. It is shown that the heavy neutrino with a mass up to 800 $GeV$ could be detected in CMS. We also investigate the production of the heavy neutrino $N_l$ mixed with $\nu_e$ and/or $\nu_{\mu}$ in the $SU_C(3) \otimes SU_L(2) \otimes SU_R(2)\otimes U(1)$ model through the reaction $pp \to W_R + X \to l^{\pm}N_l + X$ with the same heavy neutrino decay channel as above. We find that for $M_{W_R} < 3 TeV$ it is possible to discover the heavy neutrino with a mass up to $0.75 \cdot M_{W_R}$.Comment: 14 pages, 13 figure

The exact tree-level calculation of the dark photon production in high-energy electron scattering at the CERN SPS

Dark photon ($A'$) that couples to the standard model fermions via the kinetic mixing with photons and serves as a mediator of dark matter production could be observed in the high-energy electron scattering $e^- + Z ~\rightarrow e^- + Z + A'$ off nuclei followed by the $A' \to invisible$ decay. We have performed the exact, tree-level calculations of the $A'$ production cross sections and implemented them in the program for the full simulation of such events in the experiment NA64 at the CERN SPS. Using simulations results, we study the missing energy signature for the bremsstrahlung $A' \rightarrow$ invisible decay that permits the determination of the $\gamma-A'$ mixing strength in a wide, from sub-MeV to sub-GeV, $A'$ mass range. We refine and expand our earlier studies of this signature for discovering $A'$ by including corrections to the previously used calculations based on the improved Weizsaker-Williams approximation, which turn out to be significant. We compare our cross sections values with the results from other calculations and find a good agreement between them. The possibility of future measurements with high-energy electron beams and the sensitivity to $A'$ are briefly discussed.Comment: 11 pages, 6 figures, revised version, improved cross-section integrator is used, comparison with bremsstrahlung spectrum is added, final conclusions remain unchange

Missing energy signature from invisible decays of dark photons at the CERN SPS

The dark photon ($A'$) production through the mixing with the bremsstrahlung photon from the electron scattering off nuclei can be accompanied by the dominant invisible $A'$ decay into dark-sector particles. In this work we discuss the missing energy signature of this process in the experiment NA64 aiming at the search for $A'\to invisible$ decays with a high-energy electron beam at the CERN SPS. We show the distinctive distributions of variables that can be used to distinguish the $A'\to invisible$ signal from background. The results of the detailed simulation of the detector response for the events with and without $A'$ emission are presented. The efficiency of the signal event selection is estimated. It is used to evaluate the sensitivity of the experiment and show that it allows to probe the still unexplored area of the mixing strength $10^{-6}\lesssim \epsilon \lesssim 10^{-2}$ and masses up to $M_{A'} \lesssim 1$ GeV. The results obtained are compared with the results from other calculations. In the case of the signal observation, a possibility of extraction of the parameters $M_{A'}$ and $\epsilon$ by using the missing energy spectrum shape is discussed. We consider as an example the $A'$ with the mass 16.7 MeV and mixing $\epsilon \lesssim 10^{-3}$, which can explain an excess of events recently observed in nuclear transitions of an excited state of $^8$Be. We show that if such $A'$ exists its invisible decay can be observed in NA64 within a month of running, while data accumulated during a few months would allow also to determine the $\epsilon$ and $M_{A'}$ parameters.Comment: 12 pages, 15 figures. Revised versio

Simulation of the solidification of the melt in the Vanyukov furnace in the case of emergency stoppage

A mathematical model of the Vanyukov furnace, which makes it possible to predict the behavior of an object in the emergency operational mode (upon the disconnection of the oxygen supply) and develop an effective system of additional heating which damps the consequences of the emergency mode and lowers the costs for the renovation of the furnace operation, is created. It is shown how solidification upon cooling the furnace with time is simulated using the enthalpy and porosity method. The mathematical model is adopted for existing production conditions, which are weakly defined. The energy characteristics of the mode for the solidifying furnace bath, which ensures its holding for a long time in the ready state to rapid firing, are found. Thus, the problem of excessively expensive furnace firing after prolonged production stoppage is solved in the conjugated statement with a calculation of the heating system of the overbath space. © 2013 Allerton Press, Inc

Evaluation of individual-typological features of students of is professional-pedagogical institute

The article deals with the diagnostics results in the sphere of students’ predisposition to the certain sphere of professional activity; the results of distribution between the students’ population into six types of the personalityАнализируются результаты диагностики предрасположенности студентов к определенной сфере профессиональной деятельности; приводятся результаты распределения популяции обследуемых студентов на шесть типов личност

Probing lepton flavour violation in νμ+N→τ+...\nu_{\mu} + N \to \tau + ... scattering and μ→tau\mu \to tau conversion on nucleons

We study lepton flavour-violating interactions which could result in the $\tau$-lepton production in the $\nu_{\mu}N$ scattering or in $\mu \to \tau$ conversion on nucleons at high energies. Phenomenological bounds on the strength of $\bar{\tau}\nu_{\mu}\bar{q}q^{'}$ interactions are extracted from the combined result of the NOMAD and CHORUS experiments on searching for $\nu_{\mu} - \nu_{\tau}$ oscillations. Some of these bounds supersede limits from rare decays. We also propose a ``missing energy'' type experiment searching for $\mu - \tau$ conversion on nucleons. The experiment can be performed at a present accelerator or at a future neutrino factory.Comment: 13 pages, 4 figure

Структурно­функциональные модели построения автоматизированных и роботизированных молочных ферм нового поколения

The authors showed that large dairy complexes for over 2,000 cows create an increased environmental burden on the environment. The main tasks arising in this case were named: creating an optimal indoor microclimate for different age and gender groups of animals; providing sparing and comfortable modes of technological, veterinary and sanitary care and keeping animals; waste recycling; increasing the productive longevity of cows up to 4-5 lactations. (Research purpose) To develop methodologies for modular construction of an expanded standard-size range of new generation automated and robotic livestock farms. (Materials and methods) The authors proposed the main criteria and indicators for building a "smart" farm: minimum feed costs per unit of production; reduced energy consumption; optimal capital intensity of equipment and engineering structures per one livestock place; the minimum cost per unit of production with its high quality. The authors received the criterion equation for the total functional of the dairy farm. (Results and discussion) The authors analyzed the structural and functional diagrams of various configuration and size dairy farms (T-H-shaped), including combined storage farms, which make it possible to create a combined functional and logistics infrastructure consisting of standard modular units. The authors proposed the concept of building a technological module for a "smart" robotic farm for 400 heads with combined sectional feed and waste storage facilities, a robotic milking parlor, a multifunctional electrified robotic feed loader-pusher-dispenser and equipment for microclimate differentiated provision.  (Conclusions) The authors developed methods, models, structural and functional schemes for modular construction of new generation automated and robotic dairy farms of various shapes and sizes. Their following advantages were confirmed: the optimal construction time, a sparing effect on biological objects and the environment, an increase in the production digitalization and automation level, the animal productive longevity, the dairy farming profitability in general.Показали, что крупные молочно-товарные комплексы на 2000 коров и более создают повышенную экологическую нагрузку на окружающую среду. Назвали основные возникающие при этом задачи: создание оптимального микроклимата в помещениях для разных половозрастных групп; обеспечение щадящих и комфортных режимов технологического и ветеринарно-санитарного обслуживания и содержания животных; переработка отходов; повышение продуктивного долголетия коров до 4-5 лактаций. (Цель исследований) Разработать методологии модульного построения расширенного типоразмерного ряда автоматизированных и роботизированных животноводческих ферм нового поколения. (Материалы и методы) Предложили основные критерии и показатели построения «умной» фермы: минимальные затраты корма на единицу продукции; пониженный расход энергии; оптимальная капиталоемкость оборудования и инженерных сооружений в расчете  на одно скотоместо; минимальная себестоимость единицы продукции при ее высоком качестве. Получили критериальное уравнение для суммарного функционала молочной  фермы. (Результаты и обсуждение) Проанализировали структурно-функциональные схемы молочных ферм различной конфигурации и размеров (Т-Нобразной формы), в том числе совмещенные фермы-хранилища, позволяющие создать объединенную функционально-логистическую инфраструктуру, состоящую из типовых модульных единиц. Предложили концепцию построения технологического модуля «умной» роботизированной фермы на 400 голов с совмещенными секционными хранилищами кормов и отходов, роботизированным доильным залом, многофункциональным электрифицированным роботизированным погрузчиком-пододвигателем-кормораздатчиком и оборудованием для дифференцированного обеспечения микроклимата. (Выводы) Разработали методы, модели и структурно-функциональные схемы модульного построения автоматизированных и роботизированных молочных ферм нового поколения различных форм и типоразмеров. Подтвердили их преимущества: оптимальные сроки возведения, щадящее воздействие на биологические объекты и окружающую среду, повышение уровня цифровизации и автоматизации производства, продуктивного долголетия животных, рентабельности молочного животноводства в целом