Measurement of differential cross sections for top quark pair production using the lepton plus jets final state in proton-proton collisions at 13 TeV

National Science Foundation (U.S.

Particle-flow reconstruction and global event description with the CMS detector

The CMS apparatus was identified, a few years before the start of the LHC operation at CERN, to feature properties well suited to particle-flow (PF) reconstruction: a highly-segmented tracker, a fine-grained electromagnetic calorimeter, a hermetic hadron calorimeter, a strong magnetic field, and an excellent muon spectrometer. A fully-fledged PF reconstruction algorithm tuned to the CMS detector was therefore developed and has been consistently used in physics analyses for the first time at a hadron collider. For each collision, the comprehensive list of final-state particles identified and reconstructed by the algorithm provides a global event description that leads to unprecedented CMS performance for jet and hadronic tau decay reconstruction, missing transverse momentum determination, and electron and muon identification. This approach also allows particles from pileup interactions to be identified and enables efficient pileup mitigation methods. The data collected by CMS at a centre-of-mass energy of 8 TeV show excellent agreement with the simulation and confirm the superior PF performance at least up to an average of 20 pileup interactions

Search for anomalous couplings in boosted WW/WZ -> l nu q(q)over-bar production in proton-proton collisions at root s=8TeV

Peer reviewe

Kinematic research of spatial four]link not Assurian mechanism

Relevance of the research is caused by the need to explore new mechanisms that differ in structure from the Assyrians ones, for their subsequent usage in engineering practice. The main aim of the study is to study and development the universal method for researching mechanisms regardless of their structure, as well as the link adopted as the fixed one, on the example of kinematic study of a new patented not-assurian mechanism; to define the transition tensors for the kinematic pairs used in this mechanism; to obtain graphic dependences of the relative links positions to the input member. The methods used in the study: analytical method for converting homogeneous coordinates, known as a method of screw affinors. Euler angles were used to determine the relative angular displacement of links. The results. The authors have made an algorithm for studying the mechanisms, including not-assurian ones and determined the transformation tensors for one-mobile rotational kinematic pair of V class, for two-moving pair of IV class, implemented on the basis of the hydraulic cylinder and the piston and three-moving spherical joint of the III class. The graphic dependences of all unknown variables determining relative position of links of the studied mechanism in space were obtained. Conclusions. The paper substantiates the universal method for researching mechanisms regardless of their structure. If the mechanism is synthesized on the basis of the closed Grubler circuit, and its kinematics is researched by the considered methods, the universal solution for a group of analogical mechanisms, that have different link, adopted as a fixed rack, were obtained. The paper introduces the algorithm of creating the transition tensor from one coordinate system to another. A similar approach allows describing analytically any kind of relative connection of two adjacent links, which is not discussed in the article. Practical application. At rod pump operation in pumping units of the mechanized installations oil pump, the reciprocating movement is used. It is obtained by means of the rod pumping unit. If the spatial four-link mechanism is set in motion by means of the piston, the reciprocating movement of the output member will be assured. This can be used as an analogue of pumping units in oil mechanized installations

Kinematic research of spatial four]link not Assurian mechanism

Relevance of the research is caused by the need to explore new mechanisms that differ in structure from the Assyrians ones, for their subsequent usage in engineering practice. The main aim of the study is to study and development the universal method for researching mechanisms regardless of their structure, as well as the link adopted as the fixed one, on the example of kinematic study of a new patented not-assurian mechanism; to define the transition tensors for the kinematic pairs used in this mechanism; to obtain graphic dependences of the relative links positions to the input member. The methods used in the study: analytical method for converting homogeneous coordinates, known as a method of screw affinors. Euler angles were used to determine the relative angular displacement of links. The results. The authors have made an algorithm for studying the mechanisms, including not-assurian ones and determined the transformation tensors for one-mobile rotational kinematic pair of V class, for two-moving pair of IV class, implemented on the basis of the hydraulic cylinder and the piston and three-moving spherical joint of the III class. The graphic dependences of all unknown variables determining relative position of links of the studied mechanism in space were obtained. Conclusions. The paper substantiates the universal method for researching mechanisms regardless of their structure. If the mechanism is synthesized on the basis of the closed Grubler circuit, and its kinematics is researched by the considered methods, the universal solution for a group of analogical mechanisms, that have different link, adopted as a fixed rack, were obtained. The paper introduces the algorithm of creating the transition tensor from one coordinate system to another. A similar approach allows describing analytically any kind of relative connection of two adjacent links, which is not discussed in the article. Practical application. At rod pump operation in pumping units of the mechanized installations oil pump, the reciprocating movement is used. It is obtained by means of the rod pumping unit. If the spatial four-link mechanism is set in motion by means of the piston, the reciprocating movement of the output member will be assured. This can be used as an analogue of pumping units in oil mechanized installations

Design of low-temperature DDOAs on the elements of BiJFet array chip MH2XA030

Brief information about the new BiJFet array chip (AC) MH2XA030 intended for accelerated creation of analog integrated circuits (IC), which retain their performance under the influence of penetrating radiation and extremely low temperatures (up to minus 197°С) is presented. The features of schematic design of two types of DDOAs (OAmp3, OAmp4) are considered. The recommendations on the schematic design of the DDOA are developed taking into account the static characteristics of the field effect and bipolar transistors of the AC under the influence of low temperatures. The amplitude-frequency response of the DDOA and the dependence of the noise voltage on the frequency of Fourier density are given. At a temperature of -197°С cryogenic amplifiers OAmp3 (OAmp4) are characterized by the following parameters: the current consumption is less than 500 μA, the input current is less than 1 fA, the voltage gain is more than 50.000 (200.000), the offset voltage is less than 200 (60) μV. The results of the circuit simulation of the instrumentation amplifier based on DDOA OAmp3 are presented

The Study of CSC Strip Readout Electronics Operation at High Background Rates

The influence of the background rate on the operation of cathode strip chamber ( CSC) readout electronics has been studied. The investigation has been performed with two different cathode readout electronics: 16-channels preamplifier-shapers based on GASPLEX and Minsk ASIC "Katod-1". The first one have been tested with 4-layer 0.5´0.5 m2 CSC. One layer has been irradiated by X-ray tube ( Eg=8KeV) while the others - used for cosmic muon track coordinate reconstruction. Electronics based on Minsk ASIC have been tested with P3 prototype of ME1/1 CSC in pion beam at H2 experimental area. For both electronics the background contribution to the registered events as a function of the background rate are presented

Deep Underground Neutrino Experiment (DUNE) Near Detector Conceptual Design Report

International audienceThe Deep Underground Neutrino Experiment (DUNE) is an international, world-class experiment aimed at exploring fundamental questions about the universe that are at the forefront of astrophysics and particle physics research. DUNE will study questions pertaining to the preponderance of matter over antimatter in the early universe, the dynamics of supernovae, the subtleties of neutrino interaction physics, and a number of beyond the Standard Model topics accessible in a powerful neutrino beam. A critical component of the DUNE physics program involves the study of changes in a powerful beam of neutrinos, i.e., neutrino oscillations, as the neutrinos propagate a long distance. The experiment consists of a near detector, sited close to the source of the beam, and a far detector, sited along the beam at a large distance. This document, the DUNE Near Detector Conceptual Design Report (CDR), describes the design of the DUNE near detector and the science program that drives the design and technology choices. The goals and requirements underlying the design, along with projected performance are given. It serves as a starting point for a more detailed design that will be described in future documents