LCG MCDB -- a Knowledgebase of Monte Carlo Simulated Events

In this paper we report on LCG Monte Carlo Data Base (MCDB) and software which has been developed to operate MCDB. The main purpose of the LCG MCDB project is to provide a storage and documentation system for sophisticated event samples simulated for the LHC collaborations by experts. In many cases, the modern Monte Carlo simulation of physical processes requires expert knowledge in Monte Carlo generators or significant amount of CPU time to produce the events. MCDB is a knowledgebase mainly dedicated to accumulate simulated events of this type. The main motivation behind LCG MCDB is to make the sophisticated MC event samples available for various physical groups. All the data from MCDB is accessible in several convenient ways. LCG MCDB is being developed within the CERN LCG Application Area Simulation project

TauSpinner program for studies on spin effect in tau production at the LHC

Final states involving tau leptons are important components of searches for new particles at the Large Hadron Collider (LHC). A proper treatment of tau spin effects in the Monte Carlo (MC) simulations is important for understanding the detector acceptance as well as for the measurements of tau polarization and tau spin correlations. In this note we present a TauSpinner package designed to simulate the spin effects. It relies on the availability of the four-momenta of the taus and their decay products in the analyzed data. The flavor and the four-momentum of the boson decaying to the tau-tau+ or tau+- nu pair need to be known. In the Z/gamma* case the initial state quark configuration is attributed from the intermediate boson kinematics, and the parton distribution functions (PDF's). TauSpinner is the first algorithm suitable for emulation of tau spin effects in tau-embedded samples. It is also the first tool that offers the user the flexibility to simulate a desired spin effect at the analysis level. An algorithm to attribute tau helicity states to a previously generated sample is also provided.Comment: 13 pages, 6 figures New feature, an algorithm to attribute tau helicity states introduced in v

Features of Cast Asphalt Concrete Application

Секция III : Ресурсо- и энергосберегающие строительные материалы и технологииВозрастающие во всем мире интенсивность автомобильного движения и грузоперевозок предъявляют высокие требования к эксплуатационным характеристикам дорожного покрытия. Оно должно обладать повышенными показателями шероховатости и ровности, а также прочности и устойчивости дорожной одежды в целом. Одним из материалов, в наибольшей степени отвечающих перечисленным требованиям, является литой асфальтобетон. Использование литого асфальтобетона в мировом дорожном строительстве в последние годы неуклонно растет. Данная работа посвящена уникальному строительному материалу, известному человечеству с древнейших времен, но мало знакомое современному специалисту в области дорожного материаловедения.=The increasing intensity of road traffic and cargo transportation all over the world places high demands on the performance characteristics of the road surface. It should have increased roughness and evenness, as well as strength and stability of the road surface as a whole. One of the materials that most meet these requirements is cast asphalt concrete. The use of cast asphalt concrete in world road construction has been steadily increasing in recent years. This work is devoted to a unique building material, known to mankind since ancient times, but little familiar to the modern specialist in the field of road materials science

CompHEP-PYTHIA interface: integrated package for the collision events generation based on exact matrix elements

CompHEP, as a partonic event generator, and PYTHIA, as a generator of final states of detectable objects, are interfaced. Thus, integrated tool is proposed for simulation of (almost) arbitrary collision processes at the level of detectable particles. Exact (multiparticle) matrix elements, convolution with structure functions, decays, partons hadronization and (optionally) parton shower evolution are basic stages of calculations. The PEVLIB library of event generators for LHC processes is described.Comment: Standard LaTeX, 4 pages. To appear in the proceedings of the Seventh International Workshop on Advanced Computing and Analysis Technics in Physics Research (ACAT2000, Fermilab, October 16-20, 2000

Features of Cast Asphalt Concrete Application

Секция III : Ресурсо- и энергосберегающие строительные материалы и технологииВозрастающие во всем мире интенсивность автомобильного движения и грузоперевозок предъявляют высокие требования к эксплуатационным характеристикам дорожного покрытия. Оно должно обладать повышенными показателями шероховатости и ровности, а также прочности и устойчивости дорожной одежды в целом. Одним из материалов, в наибольшей степени отвечающих перечисленным требованиям, является литой асфальтобетон. Использование литого асфальтобетона в мировом дорожном строительстве в последние годы неуклонно растет. Данная работа посвящена уникальному строительному материалу, известному человечеству с древнейших времен, но мало знакомое современному специалисту в области дорожного материаловедения.=The increasing intensity of road traffic and cargo transportation all over the world places high demands on the performance characteristics of the road surface. It should have increased roughness and evenness, as well as strength and stability of the road surface as a whole. One of the materials that most meet these requirements is cast asphalt concrete. The use of cast asphalt concrete in world road construction has been steadily increasing in recent years. This work is devoted to a unique building material, known to mankind since ancient times, but little familiar to the modern specialist in the field of road materials science

Research of GIS-services applicability for solution of spatial analysis tasks

Experiments for working out the areas of applying various gis-services in the tasks of spatial analysis are discussed in this paper. Google Maps, Yandex Maps, Microsoft SQL Server are used as services of spatial analysis. All services have shown a comparable speed of analyzing the spatial data when carrying out elemental spatial requests (building up the buffer zone of a point object) as well as the preferences of Microsoft SQL Server in operating with more complicated spatial requests. When building up elemental spatial requests, internet-services show higher efficiency due to cliental data handling with JavaScript-subprograms. A weak point of public internet-services is an impossibility to handle data on a server side and a barren variety of spatial analysis functions. Microsoft SQL Server offers a large variety of functions needed for spatial analysis on the server side. The authors conclude that when solving practical problems, the capabilities of internet-services used in building up routes and completing other functions with spatial analysis with Microsoft SQL Server should be involved

Parton Distributions for Event Generators

In this paper, conventional Global QCD analysis is generalized to produce parton distributions optimized for use with event generators at the LHC. This optimization is accomplished by combining the constraints due to existing hard-scattering experimental data with those from anticipated cross sections for key representative SM processes at LHC (by the best available theory) as joint input to the global analyses. The PDFs obtained in these new type of global analyses using matrix elements calculated in any given order will be best suited to work with event generators of that order, for predictions at the LHC. This is most useful for LO event generators at present. Results obtained from a few candidate PDF sets (labeled as CT09MCS, CT09MC1 and CT09MC2) for LO event generators produced in this way are compared with those from other approaches.Comment: 35 pages, 19 figures, and 4 table

HERWIG 6.4 Release Note

A new release of the Monte Carlo program HERWIG (version 6.4) is now available. The main new features are: spin correlations between the production and decay of heavy fermions, i.e. top quarks, tau leptons and SUSY particles; polarization effects in SUSY production processes in lepton-lepton collisions; an interface to TAUOLA for tau decays; MSSM Higgs processes in lepton-lepton collisions

Herwig++ 2.1 Release Note

A new release of the Monte Carlo program Herwig++ (version 2.1) is now available. This version includes a number of significant improvements including: an eikonal multiple parton-parton scattering model of the underlying event; the inclusion of Beyond the Standard Model (BSM) physics; and a new hadronic decay model tuned to LEP data. This version of the program is now fully ready for the simulation of events in hadron-hadron collisions