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Dr P. Bartalini (CERN)27/09/2004, 14:00Track 2 - Event processingoral presentationIn the framework of the LCG Simulation Project, we present the Generator Services Sub-project, launched in 2003 under the oversight of the LHC Monte Carlo steering group (MC4LHC). The goal of the Generator Services Subproject is to guarantee the physics generator support for the LHC experiments. Work is divided into four work packages: Generator library; Storage, event interfaces and...Go to contribution page
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Dr F. Beaudette (CERN)27/09/2004, 14:20Track 2 - Event processingoral presentationAn object-oriented FAst MOnte-Carlo Simulation (FAMOS) has recently been developed for CMS to allow rapid analyses of all final states envisioned at the LHC while keeping a high degree of accuracy for the detector material description and the related particle interactions. For example, the simulation of the material effects in the tracker layers includes charged particle energy loss by...Go to contribution page
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G. Battistoni (INFN Milano, Italy)27/09/2004, 14:40Track 2 - Event processingoral presentationThe FLUKA Monte Carlo transport code is being used for different applications in High Energy, Cosmic Ray and Accelerator Physics. Here we review some of the ongoing projects which are based on this simulation tool. In particular, as far as accelerator physics is concerned, we wish to summarize the work in progress for the LHC and the CNGS project. From the point of view of experimental...Go to contribution page
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L. Pinsky (UNIVERSITY OF HOUSTON)27/09/2004, 15:00Track 2 - Event processingoral presentationThe FLUKA Monte Carlo transport code is a well-known simulation tool in High Energy Physics. FLUKA is a dynamic tool in the sense that it is being continually updated and improved by the authors. Here we review the progresses achieved in the last year on the physics models. From the point of view of hadronic physics, most of the effort is still in the field of nucleus--nucleus...Go to contribution page
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Dr J. Apostolakis (CERN)27/09/2004, 15:20Track 2 - Event processingoral presentationGeant4 is relied upon in production for increasing number of HEP experiments and for applications in several other fields. Its capabilities continue to be extended, as its performance and modelling are enhanced. This presentation will give an overview of recent developments in diverse areas of the toolkit. These will include, amongst others, the optimisation for complex setups...Go to contribution page
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A. Ribon (CERN)27/09/2004, 15:40Track 2 - Event processingoral presentationIn the framework of the LCG Simulation Physics Validation Project, we present comparison studies between the GEANT4 and FLUKA shower packages and LHC sub-detector test-beam data. Emphasis is given to the response of LHC calorimeters to electrons, photons, muons and pions. Results of "simple-benchmark" studies, where the above simulation packages are compared to data from nuclear...Go to contribution page
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Prof. V. Ivantchenko (CERN, ESA)27/09/2004, 16:30Track 2 - Event processingoral presentationWe will summarize the recent and current activities of the Geant4 working group responsible of the standard package of electromagnetic physics. The major recent activities include an design iteration in energy loss and multiple scattering domain providing "process versus models" approach, and development of the following physics models: multiple scattering, ultra relativistic muon...Go to contribution page
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M.G. Pia (INFN GENOVA)27/09/2004, 16:50Track 2 - Event processingoral presentationVarious experimental configurations - such as, for instance, some gaseous detectors, require a high precision simulation of electromagnetic physics processes, accounting not only for the primary interactions of particles with matter, but also capable of describing the secondary effects deriving from the de-excitation of atoms, where primary collisions may have created vacancies. The...Go to contribution page
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Dr T. Koi (SLAC)27/09/2004, 17:10Track 2 - Event processingoral presentationThe transportation of ions in matter is subject of much interest in not only high-energy ion-ion collider experiments such as RHIC and LHC but also many other field of science, engineering and medical applications. Geant4 is a tool kit for simulation of passage of particles through matter and its OO designs makes it easy to extend its capability for ion transports. To simulate ions...Go to contribution page
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27/09/2004, 17:30Track 2 - Event processingoral presentationA version of the Bertini cascade model for hadronic interactions is part of the Geant4 toolkit, and may be used to simulate pion-, proton-, and neutron-induced reactions in nuclei. It is typically valid for incident energies of 10 GeV and below, making it especially useful for the simulation of hadronic calorimeters. In order to generate the intra-nuclear cascade, the code depends...Go to contribution page
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M. Kosov (CERN)27/09/2004, 17:50Track 2 - Event processingoral presentationQuark-gluon strings are usually fragmented on the light cone in hadrons (PITHIA, JETSET) or in small hadronic clusters which decay in hadrons (HERWIG). In both cases the transverse momentum distribution is parameterized as an unknown function. In CHIPS the colliding hadrons stretch Pomeron ladders to each other and, when the Pomeron ladders meet in the rapidity space, they create Quasmons...Go to contribution page
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Dr P. Spentzouris (FERMI NATIONAL ACCELERATOR LABORATORY)27/09/2004, 18:10Track 2 - Event processingoral presentationComputer simulations play a crucial role in both the design and operation of particle accelerators. General tools for modeling single-particle accelerator dynamics have been in wide use for many years. Multi-particle dynamics are much more computationally demanding than single-particle dynamics, requiring supercomputers or parallel clusters of PCs. Because of this, simulations of...Go to contribution page
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Prof. A. Rimoldi (PAVIA UNIVERSITY & INFN)29/09/2004, 14:00Track 2 - Event processingoral presentationThe simulation for the ATLAS experiment is presently operational in a full OO environment and it is presented here in terms of successful solutions to problems dealing with application in a wide community using a common framework. The ATLAS experiment is the perfect scenario where to test all applications able to satisfy the different needs of a big community. Following a well stated...Go to contribution page
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M. Stavrianakou (FNAL)29/09/2004, 14:20Track 2 - Event processingoral presentationThe CMS detector simulation package, OSCAR, is based on the Geant4 simulation toolkit and the CMS object-oriented framework for simulation and reconstruction. Geant4 provides a rich set of physics processes describing in detail electro-magnetic and hadronic interactions. It also provides the tools for the implementation of the full CMS detector geometry and the interfaces required for...Go to contribution page
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A. Gheata (CERN)29/09/2004, 14:40Track 2 - Event processingoral presentationThe current major detector simulation programs, i.e. GEANT3, GEANT4 and FLUKA have largely incompatible environments. This forces the physicists willing to make comparisons between the different transport Monte Carlos to develop entirely different programs. Moreover, migration from one program to the other is usually very expensive, in manpower and time, for an experiment offline...Go to contribution page
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M. POTEKHIN (BROOKHAVEN NATIONAL LABORATORY)29/09/2004, 15:00Track 2 - Event processingoral presentationThe STAR Collaboration is currently using simulation software based on Geant 3. The emergence of the new Monte Carlo simulation packages, coupled with evolution of both STAR detector and its software, requires a drastic change of the simulation framework. We see the Virtual Monte Carlo (VMC) approach as providing a layer of abstraction that facilitates such transition. The VMC...Go to contribution page
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O. van der Aa (INSTITUT DE PHYSIQUE NUCLEAIRE, UNIVERSITE CATHOLIQUE DE LOUVAIN)29/09/2004, 15:20Track 2 - Event processingoral presentationThe observation of Higgs bosons predicted in supersymmetric theories will be a challenging task for the CMS experiment at the LHC, in particular for its High Level trigger (HLT). A prototype of the High Level Trigger software to be used in the filter farm of the CMS experiment and for the filtering of monte carlo samples will be presented. The implemented prototype heavily uses...Go to contribution page
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Dr N. Konstantinidis (UNIVERSITY COLLEGE LONDON)29/09/2004, 15:40Track 2 - Event processingoral presentationWe present a set of algorithms for fast pattern recognition and track reconstruction using 3D space points aimed for the High Level Triggers (HLT) of multi-collision hadron collider environments. At the LHC there are several interactions per bunch crossing separated along the beam direction, z. The strategy we follow is to (a) identify the z-position of the interesting interaction...Go to contribution page
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Manuel Dias-Gomez (University of Geneva, Switzerland)29/09/2004, 16:30Track 2 - Event processingoral presentationThe ATLAS experiment at the Large Hadron Collider (LHC) will face the challenge of efficiently selecting interesting candidate events in pp collisions at 14 TeV center- of-mass energy, whilst rejecting the enormous number of background events, stemming from an interaction rate of about 10^9 Hz. The Level-1 trigger will reduce the incoming rate to around O(100 kHz). Subsequently, the...Go to contribution page
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Edward Moyse29/09/2004, 16:50Track 2 - Event processingoral presentationThe event data model (EDM) of the ATLAS experiment is presented. For large collaborations like the ATLAS experiment common interfaces and data objects are a necessity to insure easy maintenance and coherence of the experiments software platform over a long period of time. The ATLAS EDM improves commonality across the detector subsystems and subgroups such as trigger, test beam...Go to contribution page
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Dr M. Steinke (Ruhr Universitaet Bochum)29/09/2004, 17:10Track 2 - Event processingoral presentationIn the past year, BaBar has shifted from using Objectivity to using ROOT I/O as the basis for our primary event store. This shift required a total reworking of Kanga, our ROOT-based data storage format. We took advantage of this opportunity to ease the use of the data by supporting multiple access modes that make use of many of the analysis tools available in ROOT. Specifically, our...Go to contribution page
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Dr S. Wynhoff (PRINCETON UNIVERSITY)29/09/2004, 17:30Track 2 - Event processingoral presentationWe report on the software for Object-oriented Reconstruction for CMS Analysis, ORCA. It is based on the Coherent Object-oriented Base for Reconstruction, Analysis and simulation (COBRA) and used for digitization and reconstruction of simulated Monte-Carlo events as well as testbeam data. For the 2004 data challenge the functionality of the software has been extended to store...Go to contribution page
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Dr J. Katzy (DESY, HAMBURG)29/09/2004, 17:50Track 2 - Event processingoral presentationDuring the years 2000 and 2001 the HERA machine and the H1 experiment performed substantial luminosity upgrades. To cope with the increased demands on data handling an effort was made to redesign and modernize the analysis software. Main goals were to lower turn-around time for physics analysis by providing a single framework for data storage, event selection, physics analysis and...Go to contribution page
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C. Pruneau (WAYNE STATE UNIVERSITY)29/09/2004, 18:10Track 2 - Event processingoral presentationWe present the design and performance analysis of a new event reconstruction chain deployed for analysis of STAR data acquired during the 2004 run and beyond. The creation of this new chain involved the elimination of obsolete FORTRAN components, and the development of equivalent or superior modules written in C++. The new reconstruction chain features a new and fast TPC cluster finder,...Go to contribution page
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N. Neumeister (CERN / HEPHY VIENNA)30/09/2004, 14:00Track 2 - Event processingoral presentationThe CMS detector has a sophisticated four-station muon system made up of tracking chambers (Drift Tubes, Cathode Strip Chambers) and dedicated trigger chambers. A muon reconstruction software based on Kalman filter techniques has been developed which reconstructs muons in the standalone muon system, using information from all three types of muon detectors, and links the resulting muon...Go to contribution page
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I. Hrivnacova (IPN, ORSAY, FRANCE)30/09/2004, 14:00Track 2 - Event processingoral presentationIn order for physicist to easily benefit from the different existing geometry tools used within the community, the Virtual Geometry Model (VGM) has been designed. In the VGM we introduce the abstract interfaces to geometry objects and an abstract factory for geometry construction, import and export. The interfaces to geometry objects were defined to be suitable to describe "geant-like"...Go to contribution page
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I. Kisel (UNIVERSITY OF HEIDELBERG, KIRCHHOFF INSTITUTE OF PHYSICS)30/09/2004, 14:20Track 2 - Event processingoral presentationTypical central Au-Au collision in the CBM experiment (GSI, Germany) will produce up to 700 tracks in the inner tracker. Large track multiplicity together with presence of nonhomogeneous magnetic field make reconstruction of events complicated. A cellular automaton method is used to reconstruct tracks in the inner tracker. The cellular automaton algorithm creates short track segments...Go to contribution page
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M. Sutton (UNIVERSITY COLLEGE LONDON)30/09/2004, 14:20Track 2 - Event processingoral presentationThe current design, implementation and performance of the ZEUS global tracking trigger barrel algorithm are described. The ZEUS global tracking trigger integrates track information from the ZEUS central tracking chamber (CTD) and micro vertex detector (MVD) to obtain a global picture of the track topology in the ZEUS detector at the second level trigger stage. Algorithm processing is...Go to contribution page
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N. Graf (SLAC)30/09/2004, 14:40Track 2 - Event processingoral presentationWe describe a Java toolkit for full event reconstruction and analysis. The toolkit is currently being used for detector design and physics analysis for a future linear e+ e- linear collider. The components are fully modular and are available for tasks from digitization of tracking detector signals through to cluster finding, pattern recognition, fitting, jetfinding, and analysis. We...Go to contribution page
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V. Tsulaia (UNIVERSITY OF PITTSBURGH)30/09/2004, 14:40Track 2 - Event processingoral presentationThe GeoModel toolkit is a library of geometrical primitives that can be used to describe detector geometries. The toolkit is designed as a data layer, and especially optimized in order to be able to describe large and complex detector systems with minimum memory consumption. Some of the techniques used to minimize the memory consumption are: shared instancing with reference counting,...Go to contribution page
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S. MUZAFFAR (NorthEastern University, Boston, USA)30/09/2004, 15:00Track 2 - Event processingoral presentationThis paper describes recent developments in the IGUANA (Interactive Graphics for User ANAlysis) project. IGUANA is a generic framework and toolkit, used by CMS and D0, to build a variety of interactive applications such as detector and event visualisation and interactive GEANT3 and GEANT4 browsers. IGUANA is a freely available toolkit based on open-source components including...Go to contribution page
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W. Liebig (CERN)30/09/2004, 15:00Track 2 - Event processingoral presentationThe athena software framework for event reconstruction in ATLAS will be employed to analyse the data from the 2004 combined test beam. In this combined test beam, a slice of the ATLAS detector is operated and read out under conditions similar to future LHC running, thus providing a test-bed for the complete reconstruction chain. First results for the ATLAS InnerDetector will be...Go to contribution page
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J. Drohan (University College London)30/09/2004, 15:20Track 2 - Event processingoral presentationWe describe the philosophy and design of Atlantis, an event visualisation program for the ATLAS experiment at CERN. Written in Java, it employs the Swing API to provide an easily configurable Graphical User Interface. Atlantis implements a collection of intuitive, data-orientated 2D projections, which enable the user to quickly understand and visually investigate complete ATLAS events....Go to contribution page
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Mr M. Ivanov (CERN)30/09/2004, 15:20Track 2 - Event processingoral presentationTracks finding and fitting algorithm in ALICE Time projection chamber (TPC) and Inner Tracking System (ITS) based on the Kalman-filtering are presented. The filtering algorithm is able to cope with non-Gaussian noise and ambiguous measurements in high-density environments. The tracking algorithm consists of two parts: one for the TPC and one for the prolongation into the ITS. The...Go to contribution page
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Dr G B. Barrand (CNRS / IN2P3 / LAL)30/09/2004, 15:40Track 2 - Event processingoral presentationPanoramix is an event display for LHCb. LaJoconde is an interactive environment over DaVinci, the analysis software layer for LHCb. We shall present global technological choices behind these two softwares : GUI, graphic, scripting, plotting. We shall present the connection to the framework (Gaudi), how we can integrate other tools like hippodraw. We shall present the overall...Go to contribution page
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D. Brown (LAWRENCE BERKELEY NATIONAL LAB)30/09/2004, 15:40Track 2 - Event processingoral presentationThis talk will describe the new analysis computing model deployed by BaBar over the past year. The new model was designed to better support the current and future needs of physicists analyzing data, and to improve BaBar's analysis computing efficiency. The use of RootIO in the new model is described in other talks. Babar's new analysis data content format contains both high and low...Go to contribution page
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A. FARILLA (I.N.F.N. ROMA3)30/09/2004, 16:30Track 2 - Event processingoral presentationA full slice of the barrel detector of the ATLAS experiment at the LHC is being tested this year with beams of pions, muons, electrons and photons in the energy range 1-300 GeV in the H8 area of the CERN SPS. It is a challenging exercise since, for the first time, the complete software suite developed for the full ATLAS experiment has been extended for use with real detector data,...Go to contribution page
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M. Donszelmann (SLAC)30/09/2004, 16:30Track 2 - Event processingoral presentationWIRED 4 is a experiment independent event display plugin module for JAS 3 (Java Analysis Studio) generic analysis framework. Both WIRED and JAS are written in Java. WIRED, which uses HepRep (HEP Representables for Event Display) as its input format, supports viewing of events using either conventional 3D projections as well as specialized projections such as a fish-eye or a rho-Z...Go to contribution page
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30/09/2004, 16:50Track 2 - Event processingoral presentationA kinematic fit package was developed based on Least Means Squared minimization with Lagrange multipliers and Kalman filter techniques and implemented in the framework of the CMS reconstruction program. The package allows full decay chain reconstruction from final state to primary vertex according to the given decay model. The class framework allowing decay tree description on every...Go to contribution page
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Dr J. LIST (University of Wuppertal)30/09/2004, 16:50Track 2 - Event processingoral presentationAnalyses in high-energy physics often involve the filling of large amounts of histograms from n-tuple like data structures, e.g. RooT trees. Even when using an object-oriented framework like RooT, a the user code often follows a functional programming approach, where booking, application of cuts, calculation of weights and histogrammed quantities and finally the filling of the...Go to contribution page
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Dr T. Speer (UNIVERSITY OF ZURICH, SWITZERLAND)30/09/2004, 17:10Track 2 - Event processingoral presentationA vertex fit algorithm was developed based on the Gaussian-sum filter (GSF) and implemented in the framework of the CMS reconstruction program. While linear least-squares estimators are optimal in case all observation errors are Gaussian distributed, the GSF offers a better treatment of the non-Gaussian distribution of track parameter errors when these are modeled by Gaussian...Go to contribution page
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Dr P. MATO (CERN)30/09/2004, 17:10Track 2 - Event processingoral presentationBender, the Python based physics analysis application for LHCb combines the best features of underlying Gaudi C++ software architecture with the flexibility of Python scripting language and provides end-users with friendly physics analysis oriented environment. It is based in one hand, on the generic Python bindings for the Gaudi framework, called GaudiPython, and in the other hand on an...Go to contribution page
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M.G. Pia (INFN GENOVA)30/09/2004, 17:30Track 2 - Event processingoral presentationStatistical methods play a significant role throughout the life- cycle of HEP experiments, being an essential component of physics analysis. We present a project in progress for the development of an object-oriented software toolkit for statistical data analysis. More in particular, the Statistical Comparison component of the toolkit provides algorithms for the comparison of data...Go to contribution page
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A. Wildauer (UNIVERSITY OF INNSBRUCK)30/09/2004, 17:30Track 2 - Event processingoral presentationFor physics analysis in ATLAS, reliable vertex finding and fitting algorithms are important. In the harsh enviroment of the LHC (~ 23 inelastic collissions every 25 ns) this task turns out to be particularily challenging. One of the guiding principles in developing the vertexing packages is a strong focus on modularity and defined interfaces using the advantages of object oriented C++....Go to contribution page
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I. Belikov (CERN)30/09/2004, 17:50Track 2 - Event processingoral presentationOne of the main features of the ALICE detector at LHC is the capability to identify particles in a very broad momentum range from 0.1 GeV/c up to 10 GeV/c. This can be achieved only by combining, within a common setup, several detecting systems that are efficient in some narrower and complementary momentum sub- ranges. The situation is further complicated by the amount of data to be...Go to contribution page
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V. Serbo (SLAC)30/09/2004, 17:50Track 2 - Event processingoral presentationJASSimApp is joint project of SLAC, KEK, and Naruto University to create integrated GUI for Geant4, based on JAS3 framework, with ability to interactively: - Edit Geant4 geometry, materials, and physics processes - Control Geant4 execution, local and remote: pass commands and receive output, control event loop - Access AIDA histograms defined in Geant4 - Show generated...Go to contribution page
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E. Vaandering (VANDERBILT UNIVERSITY)30/09/2004, 18:10Track 2 - Event processingoral presentationGenetic programming is a machine learning technique, popularized by Koza in 1992, in which computer programs which solve user-posed problems are automatically discovered. Populations of programs are evaluated for their fitness of solving a particular problem. New populations of ever increasing fitness are generated by mimicking the biological processes underlying evolution. These...Go to contribution page
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Mark DONSZELMANN (Extensions to JAS)30/09/2004, 18:10Track 2 - Event processingoral presentationJAS3 is a general purpose, experiment independent, open-source, data analysis tool. JAS3 includes a variety of features, including histograming, plotting, fitting, data access, tuple analysis, spreadsheet and event display capabilities. More complex analysis can be performed using several scripting languages (pnuts, jython, etc.), or by writing Java analysis classes. All of these...Go to contribution page
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