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Forschungsgruppe "HEPHY - Forschungsprojekt Belle / Belle II"
(Dipl.-Ing. Dr.techn. Christoph Schwanda)

Leiterin / Leiter:
Titel (vorangestellt):Dipl.-Ing. Dr.techn.
Institution:Österreichische Akademie der Wissenschaften (ÖAW)
Organisationseinheit:Institut für Hochenergiephysik (HEPHY)
Post-Adresse:Nikolsdorfer Gasse 18
Zuordnungen zu Forschungsgebieten:
  • Hochenergiephysik
  • Kern- und Teilchenphysik
Zuordnungen gemäß der Österreichischen Systematik der Wissenschaftszweige:
  • Experimentalphysik (103008)
  • Hochenergiephysik (103012)
  • Teilchenphysik (103034)
Angaben zur Datenerfassung:
Datenerfassungs-Zeitraum:von: 2007   bis einschließlich: 2011
Arbeitsgruppe zum Zeitpunkt der Datenerfassung:
wiss. Mitarbeiter/innen:
16 Personen
Thomas Bergauer
Paul Dolejschi
Annekathrin Frankenberger
Rudolf Frühwirth
Markus Friedl
Immanuel Gfall
Christian Irmler
Bernhard Leitl
Jakob Lettenbichler
Moritz Nadler
Christoph Schwanda
Dusko Smiljic
Thomas Spielauer
Felicitas Thorne
Manfred Valentan
Laurenz Widhalm
Prozent Drittmittel-finanziert:28
Wissenschaftliche Leistungen im oben angegebenen Zeitraum:
H-Index der Leiterin / des Leiters:53
Anzahl der Publikationen:215
Fünf wichtigste Publikationen:
  1. W. Dungel et al. (Belle Collaboration), "Measurement of the form factors of the decay B0 -> D*- l+ nu and determination of |Vcb|", Phys. Rev. D82 (2010) 112007.
  2. M. Friedl, C. Irmler, and M. Pernicka, "Readout of silicon strip detectors with position and timing information", Nucl. Instr. and Meth. A 598 (2009) 82.
  3. C. Schwanda et al. (Belle Collaboration), "Measurements of the Moments of the Photon Energy Spectrum in
    B -> Xs gamma Decays and Determination of |Vcb| and mb at Belle", Phys. Rev. D 78 (2008) 032016.
  4. C. Schwanda et al. (Belle Collaboration), "Moments of the hadronic invariant mass spectrum in B -> Xc l nu Decays at Belle", Phys. Rev. D 75 (2007) 032005.
  5. L. Widhalm et al. (Belle Collaboration), "Measurement of D0 -> pi l nu ( K l nu ) form factors and absolute branching fractions", Phys. Rev. Lett. 97 (2006) 061804.
  • Dungel, Wolfgang, Victor-Hess-Preis 2010 der Österreichischen Physikalischen Gesellschaft
    (Beste Dissertation auf dem Gebiet der Kern- und Teilchenphysik)
  • Dungel, Wolfgang, Best Paper Award 2011 der Österreichischen Akademie der Wissenschaftem (Beste Publikation im Bereich der math.-nath. Klasse im Jahr 2011)
Fünf wichtigste Vorträge:
  1. W. Dungel, "Measurement of the decay B -> D*lnu and determination of |Vcb| at Belle",
    35th Int. Conference on High Energy Physics (ICHEP10), Paris, France (Jul 22-28, 2010).
  2. T. Bergauer, "The Silicon Vertex Detector of the Belle II Experiment",
    19th International Workshop on Vertex Detectors, Loch Lomond, Scotland (Jun 6-11, 2010).
  3. L. Widhalm, "Leptonic and semileptonic D and Ds decays at B factories",
    Charm 07, Cornell Univ., Ithaca, NY, USA (Aug 5-8, 2007).
  4. C. Schwanda, "|Vub| and |Vcb| measurements",
    Rencontres de Physique de La Vallee d'Aoste, La Thuile, Italy (Mar 4-10, 2007).
  5. M. Friedl, "Belle Silicon Vertex Detector for the Super B Factory",
    14th International Workshop on Vertex Detectors, Chuzenji Lake, Nikko, Japan (Nov 7-11, 2005).
Bewilligte Projekte im oben angegebenen Zeitraum:
Kompetitive Projekte:
  • FWF P22742:
    Physikalische Auswertung der Daten des Belle-Experimentes
    36 Monate: Start 1.2.2011
  • FWF P24182 angeführt unter Forschungsgruppe "HEPHY - Fachbereich Algorithmen- und Softwareentwicklung"
Bearbeitete Themenfelder:
Aktuelle Themenfelder:
  • Belle Physics Analysis:
    Leadership of the Belle CKM group (top-level physics analysis group), semileptonic and leptonic B decays, determination of the Cabibbo- Kobayashi-Maskawa matrix elements |Vcb| and |Vub|, search for the charged Higgs particle in tauonic and semitauonic B decays, leptonic and semileptonic decays of charmed mesons.
  • Belle Silicon Vertex Detector Electronics:
    Design and construction of the FADCTF electronics readout boards (Fast Analogue-to-Digital Converter with Trigger Facilities), handling the data of 110 592 strip detector channels. Apart from data digitization and collection, these boards also provide a (coarse) track trigger; 36 VME modules installed; flawless operation 2003-2010.
Perspektiven (nächste 5 Jahre):
  • Belle II Silicon Vertex Detector :
    Double sided sensors (on 6" silicon wafers) for the Silicon Vertex Detector (SVD) of Belle II will be fully designed and developed at HEPHY. This involves layout, parameter specification and electrical characterization of 250 sensors, including functionality and irradiation tests. Design and construction of chip-on-sensor readout modules using a novel low-mass connectivity scheme with both electrical and mechanical design done in-house. Development of the ultra-light support structure and the cooling system with CO2 as a baseline. HEPHY has accepted the core responsibility for the new SVD including electronics (see below); one HEPHY staff member is co-leader of the international SVD collaboration.
  • Belle II Silicon Vertex Detector Electronics:
    R&D, design and (future) construction of the full readout chain between the front-end modules and the back-end Data Acquisition (DAQ) system. Based on the experience gained at Belle I and CMS, this will be an entirely new system consisting of 243 456 channels, capable of operating at a 50 times higher trigger rate. Massive parallel online data processing in FPGA (Field Programmable Gate Array) firmware will be used to achieve the necessary throughput and to reduce the data volume by a factor of approximately 60 already before being sent to the DAQ.
  • Belle II Physics Analysis:
    For the first phase of Belle II physics analysis with an integrated luminosity of about 5 ab^(-1), we have identified a tentative list of channels that allow to explore physics beyond the Standard Model:
    B+ -> tau+ nu (search for the charged Higgs boson),
    B+ -> mu+ nu (charged Higgs, first observation of this mode), and
    B0 -> phi K0-short (search for new physics contributions in the penguin loop).
Ausbildung und Vernetzung im oben angegebenen Zeitraum:
2 Dissertationen
  1. Wolfgang Dungel: "Precision measurements of the CKM matrix element |Vcb| and the form factors of semileptonic decays of B mesons", Vienna University of Technology (2010)
  2. Gerald Richter: "Stability of nonlocal quantum correlations in neutral B meson systems", Vienna University of Technology (2008)
Diplom- und Masterarbeiten:
1 Arbeit
  1. Diplomarbeit von Christian Irmler (2008) unter Forschungsgruppe "HEPHY - Fachbereich Elektronik und Werkstatt" angeführt
Internationale Vernetzung:
  • Belle physics analysis of semileptonic B decays (collaboration with 8 institutes)
  • Belle II Silicon Vertex Detector: hardware development (collaboration with 4 institutes and one company)
  • Belle II Silicon Vertex Detector: readout electronics (collaboration with 2 institutes)
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