Dr
P. Bartalini
(CERN)
9/27/04, 2:00โฏPM
Track 2 - Event processing
oral presentation
In 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...
Dr
F. Beaudette
(CERN)
9/27/04, 2:20โฏPM
Track 2 - Event processing
oral presentation
An 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...
G. Battistoni
(INFN Milano, Italy)
9/27/04, 2:40โฏPM
Track 2 - Event processing
oral presentation
The 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...
L. Pinsky
(UNIVERSITY OF HOUSTON)
9/27/04, 3:00โฏPM
Track 2 - Event processing
oral presentation
The 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...
Dr
J. Apostolakis
(CERN)
9/27/04, 3:20โฏPM
Track 2 - Event processing
oral presentation
Geant4 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...
A. Ribon
(CERN)
9/27/04, 3:40โฏPM
Track 2 - Event processing
oral presentation
In 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...
Prof.
V. Ivantchenko
(CERN, ESA)
9/27/04, 4:30โฏPM
Track 2 - Event processing
oral presentation
We 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...
M.G. Pia
(INFN GENOVA)
9/27/04, 4:50โฏPM
Track 2 - Event processing
oral presentation
Various 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...
Dr
T. Koi
(SLAC)
9/27/04, 5:10โฏPM
Track 2 - Event processing
oral presentation
The 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...
9/27/04, 5:30โฏPM
Track 2 - Event processing
oral presentation
A 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...
M. Kosov
(CERN)
9/27/04, 5:50โฏPM
Track 2 - Event processing
oral presentation
Quark-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...
Dr
P. Spentzouris
(FERMI NATIONAL ACCELERATOR LABORATORY)
9/27/04, 6:10โฏPM
Track 2 - Event processing
oral presentation
Computer 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...
Prof.
A. Rimoldi
(PAVIA UNIVERSITY & INFN)
9/29/04, 2:00โฏPM
Track 2 - Event processing
oral presentation
The 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...
M. Stavrianakou
(FNAL)
9/29/04, 2:20โฏPM
Track 2 - Event processing
oral presentation
The 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...
A. Gheata
(CERN)
9/29/04, 2:40โฏPM
Track 2 - Event processing
oral presentation
The 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...
M. POTEKHIN
(BROOKHAVEN NATIONAL LABORATORY)
9/29/04, 3:00โฏPM
Track 2 - Event processing
oral presentation
The 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...
O. van der Aa
(INSTITUT DE PHYSIQUE NUCLEAIRE, UNIVERSITE CATHOLIQUE DE LOUVAIN)
9/29/04, 3:20โฏPM
Track 2 - Event processing
oral presentation
The 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...
Dr
N. Konstantinidis
(UNIVERSITY COLLEGE LONDON)
9/29/04, 3:40โฏPM
Track 2 - Event processing
oral presentation
We 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...
Manuel Dias-Gomez
(University of Geneva, Switzerland)
9/29/04, 4:30โฏPM
Track 2 - Event processing
oral presentation
The 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...
Edward Moyse
9/29/04, 4:50โฏPM
Track 2 - Event processing
oral presentation
The 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...
Dr
M. Steinke
(Ruhr Universitaet Bochum)
9/29/04, 5:10โฏPM
Track 2 - Event processing
oral presentation
In 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...
Dr
S. Wynhoff
(PRINCETON UNIVERSITY)
9/29/04, 5:30โฏPM
Track 2 - Event processing
oral presentation
We 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...
Dr
J. Katzy
(DESY, HAMBURG)
9/29/04, 5:50โฏPM
Track 2 - Event processing
oral presentation
During 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...
C. Pruneau
(WAYNE STATE UNIVERSITY)
9/29/04, 6:10โฏPM
Track 2 - Event processing
oral presentation
We 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,...
N. Neumeister
(CERN / HEPHY VIENNA)
9/30/04, 2:00โฏPM
Track 2 - Event processing
oral presentation
The 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...
I. Hrivnacova
(IPN, ORSAY, FRANCE)
9/30/04, 2:00โฏPM
Track 2 - Event processing
oral presentation
In 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"...
I. Kisel
(UNIVERSITY OF HEIDELBERG, KIRCHHOFF INSTITUTE OF PHYSICS)
9/30/04, 2:20โฏPM
Track 2 - Event processing
oral presentation
Typical 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...
M. Sutton
(UNIVERSITY COLLEGE LONDON)
9/30/04, 2:20โฏPM
Track 2 - Event processing
oral presentation
The 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...
N. Graf
(SLAC)
9/30/04, 2:40โฏPM
Track 2 - Event processing
oral presentation
We 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...
V. Tsulaia
(UNIVERSITY OF PITTSBURGH)
9/30/04, 2:40โฏPM
Track 2 - Event processing
oral presentation
The 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,...
S. MUZAFFAR
(NorthEastern University, Boston, USA)
9/30/04, 3:00โฏPM
Track 2 - Event processing
oral presentation
This 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...
W. Liebig
(CERN)
9/30/04, 3:00โฏPM
Track 2 - Event processing
oral presentation
The 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...
J. Drohan
(University College London)
9/30/04, 3:20โฏPM
Track 2 - Event processing
oral presentation
We 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....
Mr
M. Ivanov
(CERN)
9/30/04, 3:20โฏPM
Track 2 - Event processing
oral presentation
Tracks 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...
Dr
G B. Barrand
(CNRS / IN2P3 / LAL)
9/30/04, 3:40โฏPM
Track 2 - Event processing
oral presentation
Panoramix 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...
D. Brown
(LAWRENCE BERKELEY NATIONAL LAB)
9/30/04, 3:40โฏPM
Track 2 - Event processing
oral presentation
This 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...
A. FARILLA
(I.N.F.N. ROMA3)
9/30/04, 4:30โฏPM
Track 2 - Event processing
oral presentation
A 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,...
M. Donszelmann
(SLAC)
9/30/04, 4:30โฏPM
Track 2 - Event processing
oral presentation
WIRED 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...
9/30/04, 4:50โฏPM
Track 2 - Event processing
oral presentation
A 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...
Dr
J. LIST
(University of Wuppertal)
9/30/04, 4:50โฏPM
Track 2 - Event processing
oral presentation
Analyses 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...
Dr
T. Speer
(UNIVERSITY OF ZURICH, SWITZERLAND)
9/30/04, 5:10โฏPM
Track 2 - Event processing
oral presentation
A 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...
Dr
P. MATO
(CERN)
9/30/04, 5:10โฏPM
Track 2 - Event processing
oral presentation
Bender, 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...
M.G. Pia
(INFN GENOVA)
9/30/04, 5:30โฏPM
Track 2 - Event processing
oral presentation
Statistical 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...
A. Wildauer
(UNIVERSITY OF INNSBRUCK)
9/30/04, 5:30โฏPM
Track 2 - Event processing
oral presentation
For 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++....
I. Belikov
(CERN)
9/30/04, 5:50โฏPM
Track 2 - Event processing
oral presentation
One 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...
V. Serbo
(SLAC)
9/30/04, 5:50โฏPM
Track 2 - Event processing
oral presentation
JASSimApp 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...
E. Vaandering
(VANDERBILT UNIVERSITY)
9/30/04, 6:10โฏPM
Track 2 - Event processing
oral presentation
Genetic 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...
Mark DONSZELMANN
(Extensions to JAS)
9/30/04, 6:10โฏPM
Track 2 - Event processing
oral presentation
JAS3 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...
