Moscow Institute of Physics and Technology

About: Moscow Institute of Physics and Technology is a education organization based out in Dolgoprudnyy, Russia. It is known for research contribution in the topics: Laser & Large Hadron Collider. The organization has 8594 authors who have published 16968 publications receiving 246551 citations. The organization is also known as: MIPT & Moscow Institute of Physics and Technology (State University).

Search for heavy neutrinos in K+→μ+νH decays

Abstract: Evidence of a heavy neutrino, ν H , in the K + → μ + ν H decays was sought using the E949 experimental data with an exposure of 1.70 × 1 0 12 stopped kaons. With the major background from the radiative K + → μ + ν μ γ decay understood and suppressed, upper limits (90% C.L.) on the neutrino mixing matrix element between the muon and heavy neutrinos, | U μ H | 2 , were set at the level of 1 0 - 7 to 1 0 - 9 for the heavy neutrino mass region 175 to 300 MeV / c 2 .

The evolution of large clusters under the action of ultrashort superintense laser pulses

Abstract: The evolution of large clusters exposed to a superintense ultrashort laser pulse is considered. Cluster excitation results from the interaction of its electron subsystem with the laser field. Multiple ionization and X-ray emission followed by explosion in clusters irradiated by a laser field are investigated. The increase of the electron temperature in this process and of the charge of the cluster ion are discussed. The reabsorption of photons in such a plasma is found to be relatively small. The optimal conditions are analyzed for efficient absorption of laser radiation by large clusters. This absorption occurs on the surface of the cluster only. The review is done of the works devoted to X-ray emission and generation of high harmonics of the incident radiation from a hot cluster ion. The optical density of the cluster plasma is found to be relatively small for resonance photons of multiply charged atomic ions produced inside the cluster. Expansion and decay of the cluster during and after the laser pulse are discussed.

Magnetic Immunoassay for Detection of Staphylococcal Toxins in Complex Media

Abstract: Method of highly sensitive registration of magnetic nanoparticles by their nonlinear magnetization is used in a novel sandwich-type immunoassay for detection of staphylococcal toxins in complex media of virtually any volume, with increasing sensitivity at higher sample volume. The signal is read out from the entire volume of a nontransparent 3D fiber structure employed as a solid phase, which provides large reaction surface, quick reagent mixing, as well as antigen immunofiltration directly in the course of the assay. The method has demonstrated near-linear dose-response curves within a wide range of ~3 decades, while detection of staphylococcal enterotoxin A (SEA) and toxic shock syndrome toxin (TSST) in neat milk without sample preparation. The limits of detection (LOD) as low as 4 and 10 pg/mL for TSST and SEA, respectively, were obtained in 2-h format using 30-mL samples. The second, 25-min format, showed the LOD of 0.1 and 0.3 ng/mL for the same toxins in a 150 μL sample. The developed immunoassay can be applied in food safety control, in vitro diagnostics, and veterinary for a variety of research from express tests in the field to highly sensitive laboratory tests.

Hydrogen oxidation in a stoichiometric hydrogen-air mixture in the fast ionization wave

Abstract: Oxidation of molecular hydrogen in a stoichiometric hydrogen-air mixture in the fast ionization wave (FIW) was studied at total pressures p = 1–8 Torr, and the detailed kinetics of the process has been numerically investigated. The excitation of the gas in FIW and the dynamics of molecular hydrogen concentration were monitored using measurements of absolute H2 radiation intensity (transition a 3Σ+ g → b 3Σ+ u). A comparison of calculated and experiment results allows one to draw the conclusion that the gas is predominantly excited behind the FIW front in relatively low electric fields E/n ≃ 300–600 Td at electron concentration n e ≃ (1–2) × 1012 cm−3 for a time of the order of 10 ns and can be described with good accuracy using the two-term approximation of Boltzmann's equation. In the following processes the reactions including electron-excited particles play a dominant role for times up to 100 ns, ion-molecular reactions - for the microsecond time range, reactions including radicals mostly contribute fo...

Identification of boosted, hadronically decaying W bosons and comparisons with ATLAS data taken at √s = 8 TeV

Abstract: This paper reports a detailed study of techniques for identifying boosted, hadronically decaying W bosons using 20.3 fb −¹ of proton–proton collision data collected by the ATLAS detector at the LHC at a centre-of-mass energy √s = 8 TeV. A range of techniques for optimising the signal jet mass resolution are combined with various jet substructure variables. The results of these studies in Monte Carlo simulations show that a simple pairwise combination of groomed jet mass and one substructure variable can provide a 50 % efficiency for identifying W bosons with transverse momenta larger than 200 GeV while maintaining multijet background efficiencies of 2–4 % for jets with the same transverse momentum. These signal and background efficiencies are confirmed in data for a selection of tagging techniques.