Anselm G. Vossen

Anselm G. Vossen

Assistant Professor of Physics

Office Location: 
Physics Building Room 1885, Box 90305, Durham, NC 27007
Front Office Address: 
Physics Building Room 188, PO Box 90305, Durham, NC 27708
Office Hours: 
by appointment

Overview

In Quantum Chromodynamics (QCD), the theory of the strong interactions, the nucleon emerges as a strongly interacting, relativistic bound state of almost massless quarks and gluons.
Fifty years of experimental investigations into the nucleon's internal structure have provided remarkable insight into quark and gluon dynamics. However, many outstanding questions remain.
For example, the origin of the spin of the proton is still eludes us and many other properties of the nucleon cannot yet be derived from first order calculations. Even fundamental aspects like a quantitative understanding of the  origin of the mass of the nuclei (and thus most of the visible mass in the universe) as well as the confinement of quarks into hadrons remain outside our current understanding.

My research approaches these questions from two sides. At the newly upgraded Jefferson Lab facility, we use electron proton scattering data to map out the 3D dynamics of the nucleon. We are in particular interested in polarized probes that are sensitive to spin-orbit coupling in the proton wavefunction.
And at the newly constructed Belle II experiment, we use electron-positron annihilation data, to study how hadrons emergy from initial quarks. We are in particular interested how the quantum numbers of the inital quark, like spin, are expressed in the final state hadrons.

Education & Training

  • D.R., Albert Ludwigs University of Freiburg (Germany) 2008

  • M.S., Albert Ludwigs University of Freiburg (Germany) 2004

Adamczyk, L., et al. “Dijet imbalance measurements in Au+Au and pp collisions at sqrt[s_{NN}]=200  GeV at STAR..” Physical Review Letters, vol. 119, no. 6, Aug. 2017. Epmc, doi:10.1103/physrevlett.119.062301. Full Text

Adamczyk, L., et al. “Energy dependence of J/ψ production in Au + Au collisions at sNN=39,62.4 and 200GeV.” Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics, vol. 771, Aug. 2017, pp. 13–20. Scopus, doi:10.1016/j.physletb.2017.04.078. Full Text

Seidl, R., et al. “Invariant-mass and fractional-energy dependence of inclusive production of dihadrons in e + e − annihilation at √s = 10.58 GeV.” Physical Review D, vol. 96, no. 3, Aug. 2017. Scopus, doi:10.1103/PhysRevD.96.032005. Full Text

STAR Collaboration, Chaitra S. “Global Λ hyperon polarization in nuclear collisions..” Nature, vol. 548, no. 7665, Aug. 2017, pp. 62–65. Epmc, doi:10.1038/nature23004. Full Text

Adamczyk, L., et al. “Direct virtual photon production in Au+Au collisions at sNN=200 GeV.” Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics, vol. 770, July 2017, pp. 451–58. Scopus, doi:10.1016/j.physletb.2017.04.050. Full Text

Chilikin, K., et al. “Observation of an alternative χc0(2P) candidate in e+e−→J/ψDD¯.” Physical Review D, vol. 95, no. 11, June 2017. Scopus, doi:10.1103/PhysRevD.95.112003. Full Text

Adamczyk, L., et al. “Measurement of D^{0} Azimuthal Anisotropy at Midrapidity in Au+Au Collisions at sqrt[s_{NN}]=200  GeV..” Physical Review Letters, vol. 118, no. 21, May 2017. Epmc, doi:10.1103/physrevlett.118.212301. Full Text

Hirose, S., et al. “Measurement of the τ Lepton Polarization and R(D^{*}) in the Decay B[over ¯]→D^{*}τ^{-}ν[over ¯]_{τ}..” Physical Review Letters, vol. 118, no. 21, May 2017. Epmc, doi:10.1103/physrevlett.118.211801. Full Text

Prasanth, K., et al. “First measurement of T -odd moments in D0 → KS0 π+π-π0 decays.” Physical Review D, vol. 95, no. 9, May 2017. Scopus, doi:10.1103/PhysRevD.95.091101. Full Text

Adamczyk, L., et al. “Measurement of the cross section and longitudinal double-spin asymmetry for dijet production in polarized pp collisions at s =200 GeV.” Physical Review D, vol. 95, no. 7, Apr. 2017. Scopus, doi:10.1103/PhysRevD.95.071103. Full Text

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