Conveners
Data Analysis - Algorithms and Tools: Monday
- Martin Spousta (Charles University)
Data Analysis - Algorithms and Tools: Monday
- Martin Spousta (Charles University)
Data Analysis - Algorithms and Tools: Tuesday
- Alina Gabriela Grigoras (CERN)
Data Analysis - Algorithms and Tools: Tuesday
- Alina Gabriela Grigoras (CERN)
Data Analysis - Algorithms and Tools: Thursday
- Martin Spousta (Charles University)
Camille Beluffi
(Universite Catholique de Louvain (UCL) (BE))
01/09/2014, 14:00
Data Analysis - Algorithms and Tools
Oral
The Matrix Element Method (MEM) is unique among the analysis methods used in experimental particle physics because of the direct link it establishes between theory and event reconstruction. This method was used to provide the most accurate measurement of the top mass at the Tevatron and since then it was used in the discovery of electroweak production of single top quarks . The method can in...
Nicholas Styles
(Deutsches Elektronen-Synchrotron (DE))
01/09/2014, 14:25
Data Analysis - Algorithms and Tools
Oral
After a hugely successful first run, the Large Hadron Collider (LHC) is currently in a shut-down period, during which essential maintenance and upgrades are being performed on the accelerator. The ATLAS experiment, one of the four large LHC experiments has also used this period for consolidation and further developments of the detector and of its software framework, ahead of the new challenges...
Alexandre Jean N Mertens
(Universite Catholique de Louvain (UCL) (BE))
01/09/2014, 14:50
Data Analysis - Algorithms and Tools
Oral
Delphes is a C++ framework, performing a fast multipurpose detector response simulation. The simulation includes a tracking system, embedded into a magnetic field, calorimeters and a muon system. The framework is interfaced to standard file formats and outputs observables such as isolated leptons, missing transverse energy and collection of jets which can be used for dedicated analyses. The...
Mrs
Sara Neuhaus
(TU München)
01/09/2014, 15:15
Data Analysis - Algorithms and Tools
Oral
The Belle II experiment, the successor of the Belle experiment, will go into operation at the upgraded KEKB collider (SuperKEKB) in 2016. SuperKEKB is designed to deliver an instantaneous luminosity $\mathcal{L} = 8 \times 10^{35}\mathrm{cm}^{-2}\mathrm{s}^{-1}$, a factor of 40 larger than the previous KEKB world record. The Belle II experiment will therefore have to cope with a much larger...
Mr
Geert-Jan Besjes
(Radboud Universiteit Nijmegen), Dr
Jeanette Lorenz
(Ludwig-Maximilians-Universitat Munchen)
01/09/2014, 16:10
Data Analysis - Algorithms and Tools
Oral
We present a software framework for statistical data analysis, called *HistFitter*, that has been used extensively in the ATLAS Collaboration to analyze data of proton-proton collisions produced by the Large Hadron Collider at CERN. Most notably, HistFitter has become a de-facto standard in searches for supersymmetric particles since 2012, with some usage for Exotic and Higgs boson...
Vasil Georgiev Vasilev
(CERN)
01/09/2014, 16:35
Data Analysis - Algorithms and Tools
Oral
Differentiation is ubiquitous in high energy physics, for instance for minimization algorithms in fitting and statistical analysis, detector alignment and calibration, theory. Automatic differentiation (AD) avoids well-known limitations in round-offs and speed, which symbolic and numerical differentiation suffer from, by transforming the source code of functions.
We will present how AD...
Axel Naumann
(CERN)
01/09/2014, 17:00
Data Analysis - Algorithms and Tools
Oral
The recently published ROOT 6 is the first major ROOT release since nine years. It opens a whole world of possibilities with full C++ support at the prompt and a built-in just-in-time compiler, while staying almost completely backward compatible. The ROOT team has started to make use of these new features, offering for instance an improved new implementation of TFormula, fast and type-safe...
Mr
Alexander Mott
(California Institute of Technology)
01/09/2014, 17:25
Data Analysis - Algorithms and Tools
Oral
A novel technique to identify events with a Higgs boson decaying to two photons and reject background events using neural networks trained on a quantum annealer is presented. We use a training sample composed of simulated Higgs signal events produced through gluon fusion and decaying to two photons and one composed of simulated background events with Standard Model two-photon final states. We...
Marilena Bandieramonte
(Dept. Of Physics and Astronomy, University of Catania and Astrophysical Observatory, Inaf Catania)
02/09/2014, 14:00
Data Analysis - Algorithms and Tools
Oral
Clustering analysis is a set of multivariate data analysis techniques through which is possible to gather statistical data units, in order to minimize the "logical distance" within each group and to maximize the one between groups. The "logical distance" is quantified by measures of similarity/dissimilarity between defined statistical units. Clustering techniques are traditionally applied to...
Prof.
Nikolay Gagunashvili
(University of Akureyri, Borgir, v/Nordurslod, IS-600 Akureyri, Iceland & Max-Planck-Institut f\"{u}r Kernphysik, P.O. Box 103980, 69029 Heidelberg, Germany)
02/09/2014, 14:25
Data Analysis - Algorithms and Tools
Oral
A mixture density model-based procedure for correcting experimental data for distortions due to finite resolution and limited detector acceptance is presented. The unfolding problem is known to be an ill-posed problem that can not be solved without some a priori information about the solution such as, for example, smoothness or positivity. In the approach presented here the true distribution...
John Apostolakis
(CERN)
02/09/2014, 14:50
Data Analysis - Algorithms and Tools
Oral
The Geant4 toolkit is used in the production detector simulations of most recent High Energy Physics experiments, and diverse applications in medical physics, radiation estimation for satellite electronics and other fields. We report on key improvements relevant to HEP applications that were provided in the most recent releases: 9.6 (Dec 2012) and 10.0 (Dec 2013).
'Strong' reproducibility...
Marcin Nowak
(Brookhaven National Laboratory (US))
02/09/2014, 15:15
Data Analysis - Algorithms and Tools
Oral
During the LHC's first Long Shutdown (LS1) ATLAS set out to establish a new analysis model, based on the experience gained during Run 1. A key component of this is a new Event Data Model (EDM), called the xAOD. This format, which is now in production, provides the following features:
- A separation of the EDM into interface classes that the user code directly interacts with, and data...
Johannes Rauch
(T)
02/09/2014, 16:10
Data Analysis - Algorithms and Tools
Oral
Genfit is an experiment-independent track-fitting toolkit, which combines fitting algorithms,
track representations, and measurement geometries into a modular framework. We report
on a significantly improved version of Genfit, based on experience gained in the Belle II,
PANDA, and FOPI experiments. Improvements concern the implementation of additional
track-fitting algorithms, enhanced...
Christian Pulvermacher
(KIT)
02/09/2014, 16:35
Data Analysis - Algorithms and Tools
Oral
Belle II is an experiment being built at the $e^+e^-$ SuperKEKB B factory, and will record decays of a large number of $B \bar B$ pairs.
This pairwise production of $B$ mesons allows analysts to use one correctly reconstructed $B$ meson to deduce the four-momentum and flavour of the other (signal-side) $B$ meson, without reconstructing any of its daughter particles.
It also permits, in...
Mr
Cristiano Fanelli
(INFN Sezione di Roma, Universit\`a di Roma `La Sapienza', Roma, Italy)
02/09/2014, 17:00
Data Analysis - Algorithms and Tools
Oral
A new tracker based on the GEM technology is under development for the upcoming experiments in Hall A at Jefferson Lab, where a longitudinally polarized electron beam of 11 GeV, combined with innovative polarized targets, will provide luminosity up to 10$^{39}$/(s cm$^{2}$) opening exciting opportunities to investigate unexplored aspects of the inner structure of the nucleon and the dynamics...
Andrey Sapronov
(Joint Inst. for Nuclear Research (RU))
02/09/2014, 17:25
Data Analysis - Algorithms and Tools
Oral
We present the HERAFitter project, a unique platform for QCD analyses
of hadron-induced processes in the context of multi-process and
multi-experiment setting. Based on the factorisable nature of the
hadronic cross sections into universal parton distribution functions
(PDFs) and process dependent partonic scattering cross sections,
HERAFitter allows determination of the PDFs from...
Dr
Evan Sangaline
(Michigan State University)
04/09/2014, 14:00
Data Analysis - Algorithms and Tools
Oral
Probabilistically identifying particles and extracting particle yields are fundamentally important tasks required in a wide range of nuclear and high energy physics analyses. Quantities such as ionization energy loss, time of flight, and Čerenkov angle can be measured in order to help distinguish between different particle species, but distinguishing becomes difficult when there is no clear...
Vladislav Matoušek
(Institute of Physics, Slovak Academy of Sciences)
04/09/2014, 14:25
Data Analysis - Algorithms and Tools
Oral
The deconvolution methods are very efficient and widely used tools to improve the resolution in the spectrometric data. They are of great importance mainly in the tasks connected with decomposition of low amplitude overlapped peaks (multiplets) in the presence of noise.
In the talk we will present a set of deconvolution algorithms and a study of their decomposition capabilities from the...
Jiri Franc
(Czech Technical University in Prague)
04/09/2014, 14:50
Data Analysis - Algorithms and Tools
Oral
The application of multivariate analysis techniques in experimental high energy
physics have been accepted as one of the fundamental tools in the discrimination
phase, when signal is rare and background dominates. The purpose of this study is
to present new approaches to the variable selection based on phi-divergences,
together with various statistical tests, and the combination of new...
David Lange
(Lawrence Livermore Nat. Laboratory (US))
04/09/2014, 15:15
Data Analysis - Algorithms and Tools
Oral
Over the past several years, the CMS experiment has made significant changes to its detector simulation application. The geometry has been generalized to include modifications being made to the CMS detector for 2015 operations, as well as model improvements to the simulation geometry of the current CMS detector and the implementation of a number of approved and possible future detector...
