The multiplicity and the spectra of secondaries correlated with the leading particle energy

The spectra of leading particles of different nature in pp-collisions at E sub 0 = 33 GeV are obtained. The multiplicities and the spectra of secondaries, mesons, gamma-quanta, lambda and lambda-hyperons and protons for different leading particle energy ranges are determined

Modular detector for deep underwater registration of muons and muon groups

Registration and identification of muons and muon groups penetrating into the ocean depth, can be performed using a modular multilayer detector with high resolution bidimensional readout - deep underwater calorimeter (project NADIR). Laboratory testing of a prototype sensor cell with liquid scintillator in light-tight casing, testifies to the practicability of the full-scale experiment within reasonable expences

Rapidity-dependence of jet shape broadening and quenching

The jet shape modification due to partonic energy loss in the dense QCD matter is investigated by the help of the special transverse energy-energy correlator in the vicinity of maximum energy deposition of every event. In the accepted scenario with scattering of jet hard partons off comoving medium constituents this correlator is independent of the pseudorapidity position of a jet axis and becomes considerably broader (symmetrically over the pseudorapidity and the azimuthal angle) in comparison with $pp$-collisions. At scattering off "slow" medium constituents the broadening of correlation functions is dependent on the pseudorapidity position of a jet axis and increases noticeably in comparison with the previous scenario for jets with large enough pseudorapidities. These two considered scenarios result also in the different dependence of jet quenching on the pseudorapidity.Comment: 9 pages, 7 figures, 1 table, RevTex4, typos corrected, accepted for publication in Phys. Rev.

Discriminant Functions Quality Estimation on the Basis of Training and Testing Samples

The way of comparison of discriminant functions with dividing samples observations on training and testing subsamples is proved. Conditions of existence of optimum set of features which depend on parameters of general sets and volumes samples are received. Laws of simplification of optimum discriminant function at decrease of volumes samples and at increase of dispersions of features are revealed.Обґрунтовано спосіб порівняння дискримінантних функцій з розбиттям вибірок спостережень на навчальні й перевірні підвибірки. Отримано умови існування оптимальної множини ознак, які залежать від параметрів генеральних сукупностей і обсягів вибірок. Виявлено закономірності спрощення оптимальної дискримінантної функції при зменшенні обсягів вибірок і при збільшенні дисперсій ознак.Обоснован способ сравнения дискриминантных функций с разбиением выборок наблюдений на обучающие и проверочные подвыборки. Получены условия существования оптимального множества признаков, которые зависят от параметров генеральных совокупностей и объемов выборок. Выявлены закономерности упрощения оптимальной дискриминантной функции при уменьшении объемов выборок и при увеличении дисперсий признаков

The system of EAS time analysis

The extensive air showers' (EAS) front shape, angle of incidence, disk thickness, particle distribution along the shower, on the delayed and EAS front advancing particles were determined. The suggested system of the EAS time analysis allows determination of the whole EAS longitudinal structure at the observation points. The information from the detectors is continuously recorded in the memory with the memory cell switching in 5 ns, this enables fixation of the moment of pulse input from the detector with an accuracy to + or - 2.5 ns. Along with the fast memory, a slow memory with the cell switching in 1 micron s is introduced in the system, this permits observation of relatively large time intervals with respect to the trigger pulse with an appropriately lower accuracy

Rare mushroom species of oak forests in the northern forest-steppe of Central Russia

Oaks of the forest-steppe of the East European Plain are important for the conservation of rare mycobiota species. They contain approximately 45 % of the mushroom species, the preservation of which is required in the region

Medium-modified fragmentation of b-jets tagged by a leading muon in ultrarelativistic heavy ion collisions

The possibility to observe the medium-modified fragmentation of hard b-quarks tagged by a leading muon in ultrarelativistic heavy ion collisions is analyzed. We have found that reasonable statistics, ~20000 events per 1 month of LHC run with lead beams, can be expected for the realistic geometrical acceptance and kinematic cuts. The numerical estimates on the effect of the medium-induced softening b-jet fragmentation function are given.Comment: 12 pages in LaTeX (including 3 figures in EPS-format

Elliptic flow studies using the CMS detector

The azimuthal anisotropy of charged particles in heavy ion collisions is an important probe of quark-gluon plasma evolution at early stages. The nuclear reaction plane can be determined independently by different detector subsystems and using different analysis methods. This paper reports the capability of the CMS detector at the LHC to reconstruct the reaction plane of the collision and to me asure elliptic flow with calorimetry and a tracking system. The analysis is based on a full CMS detector simulation of \rm{Pb+Pb} events with the HYDJET event generator