Alliance Workshop on Unfolding and Data Correction

Europe/Berlin
SR 4a (DESY Hamburg)

SR 4a

DESY Hamburg

Thomas Schoerner-Sadenius (DESY)
Description
The issue of data correction and data unfolding will play a crucial role for a number of measurements (not only) in the early LHC data. Furthermore, a number of more or less well-motivated and well-implemented methods exists which (and the arguments for and against which) are not necessarily familiar to the relevant community. This workshop at DESYHamburg will focus on the topic of unfolding and data correction. The aims of the workshop are - to get an overview of the various tools that are being used for unfolding purposes at HERA, Tevatron and LHC - to discuss the advantages and disadvantages of the various methods, and to collect the benchmarkings that have been done so far - to discuss the various implementations and their shortcomings - to come up with a strategy for further implementation, improvement and promotion of some of the tools. The meeting will be transmitted by EVO: Title: Analysis Centre Seminars Description: Analysis Centre Seminars Community: Terascale Phone Bridge ID: 1312410 Meeting URL: http://evo.vrvs.org/evoGate/koala.jnlp?meeting=MaMDMt222sDeDi9M98DI9a In case of questions, don't hesitate to contact the organisers at anacen@desy.de.
Participants
  • Arnulf Quadt
  • Bakul Gaur
  • Benno List
  • Daniel Britzger
  • David Fischer
  • Deepak Kar
  • Elin Bergeaas Kuutmann
  • Frank Ellinghaus
  • Gabriel Hare
  • Giulio D'Agostini
  • Günter Zech
  • Hanno Perrey
  • Hartmut Stadie
  • Kai Grybel
  • Katharina Bierwagen
  • Marcello Barisonzi
  • Marisa Sandhoff
  • Markus Schneider
  • Michel Sauter
  • Natalie Milke
  • Philipp Pahl
  • Sebastian Wahrmund
  • Sergey Kalinin
  • Stober Fred
  • Thomas Peiffer
  • Thomas Schoerner-Sadenius
  • Tim Adye
  • Ulrike Blumenschein
  • Volker Blobel
Support
    • 1
      Welcome
      Speaker: Dr Thomas Schoerner-Sadenius (DESY)
      Slides
    • 2
      Introduction to the subject
      Speaker: Prof. Arnulf Quadt (II. Physikalisches Institut, Georg-August-Universität Göttingen)
    • 3
      Improved iterative Bayesian unfolding
      This paper reviews the basic ideas behind a Bayesian unfolding published some years ago and improves their implementation. In particular, uncertainties are now treated at all levels by probability density functions and their propagation is performed by Monte Carlo integration. Thus, small numbers are better handled and the final uncertainty does not rely on the assumption of normality. Theoretical and practical issues concerning the iterative use of the algorithm are also treated. The new program, implemented in the R language, is freely available, together with sample scripts to play with toy models.
      Speaker: Giulio d'Agostini (Rome)
      Slides
    • 4
      Multidimensional binning-free unfolding method
      Speaker: Guenter Zech (Siegen)
    • 5
      Unfolding requirements and some details on algorithms and problems related to unfolding
      Speaker: Prof. Volker Blobel (Uni HH)
      Slides
    • 15:40
      Coffee break
    • 6
      Discussion on some unfolding issues
      Speaker: Guenter Zech (Siegen)
      Slides
    • 7
      Decomposition of a covariance matrix into uncorrelated and correlated errors
      Speaker: Benno List (Hamburg)
      Slides
    • 8
      Comparison of methods
      Speaker: Katharina bierwagen (Goettingen)
      Slides
    • 9
      Discussion session: Basics, concepts, missing implementations ...
    • 10
      Implementations: RooUnfold
      Speaker: Tim Adye
      Slides
    • 11
      Implementations: TRUEE
      Speaker: Natalie Milke
      Slides
    • 12
      Implementations: TUnfold
      Speaker: Michel Sauter (Universitaet Heidelberg)
      Slides
    • 13
      Discussion: Implementations
    • 10:25
      Coffee break
    • 14
      Experience / benchmarkings: CMS
      Speaker: Thomas Peiffer (Karlsruhe)
    • 15
      Experience / benchmarking: Unfolding in ATLAS
      Speaker: Marisa Sandhoff (Wuppertal)
      Slides
    • 16
      Experience with GURU
      Speaker: Sebastian Eckweiler (Mainz)
      Slides
    • 17
      Experience / benchmarking: Unfolding in ATLAS
      Speaker: Mr Deepak Kar (University of Florida)
    • 18
      Discussion: next steps?