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College of Arts and Sciences

Anselm G Vossen

Anselm G Vossen Dr. rer. nat. Dipl. Inf.
Nuclear Physics

Diplom, University of Freiburg, 2004 (C.S.)
PhD, University of Freiburg, 2008
Postdoc, University of Illinois at Urbana-Champaign, 2008-2010

Office: (812) 856-0730
Email: avossen at

My primary research goals are directed toward understanding nucleon structure, and the QCD effects governing it. Here I concentrate on the quantitative understanding of transverse spin phenomena. They are a primary tool by which we can test our knowledge gained, for example, from models or lattice calculations. They are also very challenging, due to the complex interplay between soft and hard scale effects and, possibly, non-perturbative interactions with the QCD vacuum. To disentangle these, we need the input from many experiments and configurations, like semi-inclusive deep inelastic scattering (SIDIS), electron-positron annihilation and proton-proton scattering. Currently I am investigating these effects in polarized proton scattering at RHIC and electron-positron annihilation at KEK.

Selected Publications

  • A. Vossen et. al. "Observation of the Interference Fragmentation Function for Charged Pion Pairs in e+e- annihilation at sqrt(s) = 10:58GeV ", Phys. Rev. Lett. 107, 072004 (2011), arXiv:1104.2425
  • A. Vossen and the PHENIX collaboration, "Forward Transverse Spin Asymmetries at PHENIX", J. Phys. Conf. Ser. 316 012004
  • A. Adare et. al. "Cold Nuclear Matter Eff ects on J/Psi Yields as a Function of Rapidity and Nuclear Geometry in d+A Collisions at sqrt(s)_{NN} = 200 GeV", Phys. Rev. Lett. 107, 142301 (2011)
  • A. Adare et. al. "Cross Section and Parity Violating Spin Asymmetries of W+/- Boson Production in Polarized p+p Collisions at sqrt(s) = 500 GeV", Phys. Rev. Lett. 106, 062001 (2011)
  • The COMPASS Collaboration, "Collins and Sivers asymmetries for pions and kaons in muon-deuteron DIS", Physics Letters B673 (2009) 127-135