II. Physikalisches Institut

Prof. Dr. Arnulf Quadt

Research Interests

My research interests involve a deeper understanding of Quantum-Chromodynamics and electroweak symmetry breaking, in particular physics of the top-quark and of the Higgs-boson. Together with my working group, I was involved in the discovery of the Higgs-boson with the ATLAS-experiment at the Large Hadron Collider (LHC) at CERN in Geneva, Switzerland. There, where proton-proton collisions at energies of 13/14 TeV are investigated. These collision energies, the highest ever achieved at a collider, allow us to produce heavy fundamental particles such as the top-quark or the Higgs-boson, and study their properties and interactions.

With the available wealth of ATLAS-data, we presently focus on studies of the properties of the top-quark and the Higgs-boson, in particular their quantum numbers and their gauge couplings. Of special focus are presently the electromagnetic, the neutral current electroweak, the charged current electroweak and the strong gauge coupling of the top-quark, and the Higgs-Yukawa coupling to the tau-lepton, the b-quark and the top-quark. Those measurements will provide us insights into precision tests of the Standardmodel of elementary particle physics and sensitivity to physics beyond the Standardmodel.

In addition, we contribute to the development and upgrade of the ATLAS-pixel detector. With the upcoming upgrade of the Large Hadron Collider (high lumi LHC, HL-LHC, which will increase the beam intensity and hence the luminosity, in particular the inner tracking detector will have to face new challenges. The data readout rate will increase dramatically. Furthermore, the radiation exposure of the sensor material and readout electronics will reach unprecedented levels so that new and radiation-hard sensors and electronics needs to be developed. Focus of our efforts is R&D in new sensors, readout electronics, testbeam organisation and analysis, module assembly and others.

Furthermore, the amount and nature of real and simulated data, required for the analysis of LHC data and the extraction of physics results reaches unprecedented quantities and complexity. The world-wide LHC computing grid (WLCG) collaboration provides national and international computing resources to address this challenge. In this context, we run an operate a Tier-2 and Tier-3 grid computing center, called "Goegrid" and conduct research in monitoring grid resources, integration of cloud computing resources and improved performance.

Research Group

Academics and Post-Doctoral Fellows

  • Prof. Dr. Baida Achkar (Gastprofessur)
  • Priv.-Doz. Dr. Ralf Bernhard (Privatdozent, assoziiert)
  • Priv.-Doz. Dr. Jörn Große-Knetter (Privatdozent)
  • Priv.-Doz. Dr. Markus Keil (Privatdozent, assoziiert)
  • Dr. Jörn Lange (wissenschaftlicher Angestellter)
  • Dr. Marcello Bindi (wissenschaftlicher Angestellter)
  • Dr. Gen Kawamura (wissenschaftlicher Angestellter)
  • Dr. Clara Nellist (wissenschaftliche Angestellte)
  • Dr. Thomas Peiffer (wissenschaftlicher Angestellter)
  • Dr. Elizaveta Shabalina (wissenschaftliche Angestellte)
  • Dr. Ali Skaf (wissenschaftlicher Angestellter)
  • Dr. Royer Edson Ticse Torres (wissenschaftlicher Angestellter)

PhD Students

  • Helge Beck
  • Tobias Bisanz
  • Eric Buschmann
  • Tomas Dado (jointly supervised with Bratislava University)
  • Michal Dubovsky (jointly supervised with Bratislava University)
  • Jannik Geisen
  • Andreas Kirchhoff
  • Johannes Mellenthin
  • Silke Möbius
  • Marcel Niemeyer
  • Ishan Pokharel
  • Paolo Sabatini
  • Fabian Sohns
  • Knut Zoch

Master's Students

  • Steffen Korn
  • Paul Konstantin Krug
  • Kevin Moor
  • Noreen Rauls
  • Marike Schwickardi


Community Service


Selected Publications

  • "Measurement of the neutral current cross section and F2 structure function for deep inelastic e+p scattering at HERA?, The ZEUS Collaboration, S.Chekanov et al., Eur.Jour.Phys.C21, 443-471 (2001)
  • "Review of Particle Physics", C. Patrignani et al. (Particle Data Group), Chin. Phys. C, 40, 100001 (2016).
  • "Top quark physics at hadron colliders", A.Quadt, Eur.Phys.J.C48, 835-1000, (2006).
  • "Search for the Standard Model Higgs Boson at LEP", The LEP Working Group for Higgs Boson searches, Phys.Lett.B, 565, 61-75 (2003)
  • "Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC?, ATLAS Collaboration, G. Aad et al., Phys. Lett. B 716 (2012) 1-29
  • The ATLAS Collaboration, "Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector", JHEP 04 (2015) 117.

A full list of publications can be found here.

Work History and Education

1990-1993 student of physics and mathematics at University of Bonn
1993-1996 DPhil student at University of Oxford on ZEUS experiment at HERA
1997-1998 PostDoc at University of Oxford on ZEUS experiment at HERA
1997 MSc by research student at University of Oxford on ZEUS experiment at HERA
1999-2000 CERN research fellow on OPAL experiment at LEP and on CMS experiment at LHC
2000-2001 CERN research staff on OPAL experiment at LEP and on CMS experiment at LHC
2001-2006 junior faculty (Hochschulassistent) at University of Bonn on D0 experiment at Tevatron, OPAL experiment at LEP and ATLAS experiment at LHC
2003-2005 visiting assistent professor at Rochester University/NY and Fermilab/Batavia with Tom Ferbel as AvH Feodor-Lynen fellow
2005-2006 interim professor in experimental particle physics at University of Göttingen
2006 Habilitation at University of Bonn on "Top Quark Physics at Hadron Colliders"
2006 DFG-Heisenberg fellow at Max-Planck-Institute for Physics (Werner-Heisenberg-Institut) on ATLAS experiment at LHC
2006 - full professor at Georg-August-University of Göttingen on ATLAS experiment at LHC and on D0 experiment at Tevatron.