Estimation of Goodness-of-Fit in Multidimensional Analysis Using Distance to Nearest NeighborA new method for calculation of goodness of multidimensional fits in particle physics experiments is proposed. This method finds the smallest and largest clusters of nearest neighbors for observed…Ilya Narsky·Jun 24, 2003SaveLearn
Influence of the bin-to-bin and inside bin correlations on measured quantitiesA new method for measuring the quantities influenced by bin-to-bin and inside bin correlations is presented. This method is essential for large multiplisity and/or high density of particles in phase…V. Perevoztchikov, M. Tabidze, A. Tomaradze·Jun 24, 2003SaveLearn
The uniformly most powerful test of statistical significance for counting-type experiments with backgroundIn this paper, after a discussion of general properties of statistical tests, we present the construction of the most powerful hypothesis test for determining the existence of a new phenomenon in…L. Fleysher, R. Fleysher, T. J. Haines et al.·Jun 19, 2003SaveLearn
Macrostate Data ClusteringWe develop an effective nonhierarchical data clustering method using an analogy to the dynamic coarse graining of a stochastic system. Analyzing the eigensystem of an interitem transition matrix…Daniel Korenblum, David Shalloway·Jun 19, 2003SaveLearn
Asymmetric Systematic ErrorsAsymmetric systematic errors arise when there is a non-linear dependence of a result on a nuisance parameter. Their combination is traditionally done by adding positive and negative deviations…Roger Barlow·Jun 18, 2003SaveLearn
Data compression using correlations and stochastic processes in the ALICE Time Projection chamberIn this paper lossless and a quasi lossless algorithms for the online compression of the data generated by the Time Projection Chamber (TPC) detector of the ALICE experiment at CERN are described.…M. Ivanov, A. Nicolaucig, A. Krechtchouk·Jun 17, 2003SaveLearn
Status of the physics validation studies using Geant4 in ATLASThe new simulation for the ATLAS detector at LHC is performed using Geant4 in a complete OO/C++ environment. In this framework the simulation of the various test beams for the different ATLAS…Andrea Dell'Acqua·Jun 16, 2003SaveLearn
The new object oriented analysis framework for H1During 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…M. Peez·Jun 16, 2003SaveLearn
The RooFit toolkit for data modelingRooFit is a library of C++ classes that facilitate data modeling in the ROOT environment. Mathematical concepts such as variables, (probability density) functions and integrals are represented as C++…Wouter Verkerke, David Kirkby·Jun 14, 2003SaveLearn
LCIO - A persistency framework for linear collider simulation studiesAlmost all groups involved in linear collider detector studies have their own simulation software framework. Using a common persistency scheme would allow to easily share results and compare…Frank Gaede, Ties Behnke, Norman Graf et al.·Jun 13, 2003SaveLearn
HBT-Analyzer - Particle Correlations Analysis ToolkitThe HBT-Analyzer is an universal tool for particle correlations analysis under the ROOT environment. It provides an efficient mixing mechanism, a wide range of correlation and monitoring functions,…Piotr Krzysztof Skowronski, for ALICE Collaboration·Jun 13, 2003SaveLearn
The PROOF Distributed Parallel Analysis Framework based on ROOTThe development of the Parallel ROOT Facility, PROOF, enables a physicist to analyze and understand much larger data sets on a shorter time scale. It makes use of the inherent parallelism in event…Maarten Ballintijn, Rene Brun, Fons Rademakers et al.·Jun 13, 2003SaveLearn
CMS Data Analysis: Current Status and Future StrategyWe present the current status of CMS data analysis architecture and describe work on future Grid-based distributed analysis prototypes. CMS has two main software frameworks related to data analysis:…Vincenzo Innocente·Jun 12, 2003SaveLearn
Reconstruction of electrons with the Gaussian-sum filter in the CMS tracker at LHCThe bremsstrahlung energy loss distribution of electrons propagating in matter is highly non Gaussian. Because the Kalman filter relies solely on Gaussian probability density functions, it might not…W. Adam, R. Frühwirth, A. Strandlie et al.·Jun 11, 2003SaveLearn
The full detector simulation for the Atlas experiment: status and outlookThe simulation of the ATLAS detector is a major challenge, given the complexity of the detector and the demanding environment of the LHC. The apparatus, one of the biggest and most complex ever…A. Rimoldi, A. Dell'Acqua·Jun 11, 2003SaveLearn
Combined first--principles calculation and neural--network correction approach as a powerful tool in computational physics and chemistryDespite of their success, the results of first-principles quantum mechanical calculations contain inherent numerical errors caused by various approximations. We propose here a neural-network…LiHong Hu, XiuJun Wang, LaiHo Wong et al.·Jun 10, 2003SaveLearn
Spike sorting in the frequency domain with overlap detectionThis paper deals with the problem of extracting the activity of individual neurons from multi-electrode recordings. Important aspects of this work are: 1) the sorting is done in two stages - a…Dima Rinberg, William Bialek, Hanan Davidowitz et al.·Jun 9, 2003SaveLearn
Entropy and information in neural spike trains: Progress on the sampling problemThe major problem in information theoretic analysis of neural responses and other biological data is the reliable estimation of entropy--like quantities from small samples. We apply a recently…Ilya Nemenman, William Bialek, Rob de Ruyter van Steveninck·Jun 7, 2003SaveLearn
Sensor Alignment by TracksGood geometrical calibration is essential in the use of high resolution detectors. The individual sensors in the detector have to be calibrated with an accuracy better than the intrinsic resolution,…V. Karimaki, A. Heikkinen, T. Lampen et al.·Jun 4, 2003SaveLearn
Terabyte IDE RAID-5 Disk ArraysHigh energy physics experiments are currently recording large amounts of data and in a few years will be recording prodigious quantities of data. New methods must be developed to handle this data and…D. A. Sanders, L. M. Cremaldi, V. Eschenburg et al.·Jun 4, 2003SaveLearn
Revison Control in the Grid Era - the unmet challengeAs we move to distribute High Energy Physics computing tasks throughout the global Grid, we are encountering ever more severe difficulties installing and selecting appropriate versions of the…Arthur Kreymer·Jun 4, 2003SaveLearn
Go4 v2 Analysis FrameworkGo4 developed at GSI is an analysis framework with a general purpose non blocking GUI. Go4 is based on ROOT. The GUI is implemented in Qt using GSI's QtROOT interface. Analysis and GUI run in…J. Adamczewski, M. Al-Turany, D. Bertini et al.·Jun 3, 2003SaveLearn
Virtual Data in CMS AnalysisThe use of virtual data for enhancing the collaboration between large groups of scientists is explored in several ways: - by defining ``virtual'' parameter spaces which can be searched and…A. Arbree, P. Avery, D. Bourilkov et al.·Jun 2, 2003SaveLearn
Vertex reconstruction framework and its implementation for CMSThe class framework developed for vertex reconstruction in CMS is described. We emphasize how we proceed to develop a flexible, efficient and reliable piece of reconstruction software. We describe…T. Boccali, R. Fruhwirth, W. Waltenberger et al.·Jun 2, 2003SaveLearn
Next-Generation EU DataGrid Data Management ServicesWe describe the architecture and initial implementation of the next-generation of Grid Data Management Middleware in the EU DataGrid (EDG) project. The new architecture stems out of our experience…Diana Bosio, James Casey, Akos Frohner et al.·May 30, 2003SaveLearn