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. “Di-hadron correlations with identified leading hadrons in 200 GeV Au+Au and d+Au collisions at STAR.” Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics, vol. 751, Dec. 2015, pp. 233–40. Scopus, doi:10.1016/j.physletb.2015.10.037. Full Text

Adamczyk, L., et al. “Observation of Transverse Spin-Dependent Azimuthal Correlations of Charged Pion Pairs in p^{↑}+p at sqrt[s]=200  GeV..” Physical Review Letters, vol. 115, no. 24, Dec. 2015. Epmc, doi:10.1103/physrevlett.115.242501. Full Text

Adamczyk, L., et al. “Azimuthal Anisotropy in U+U and Au+Au Collisions at RHIC..” Physical Review Letters, vol. 115, no. 22, Nov. 2015. Epmc, doi:10.1103/physrevlett.115.222301. Full Text

Chang, Y. .. Y., et al. “Observation of B^{0}→pΛ[over ¯]D^{(*)-}..” Physical Review Letters, vol. 115, no. 22, Nov. 2015. Epmc, doi:10.1103/physrevlett.115.221803. Full Text

Seidl, R., et al. “Inclusive cross sections for pairs of identified light charged hadrons and for single protons in e+e- at s =10.58 GeV.” Physical Review D  Particles, Fields, Gravitation and Cosmology, vol. 92, no. 9, Nov. 2015. Scopus, doi:10.1103/PhysRevD.92.092007. Full Text

Adamczyk, L., et al. “Measurement of interaction between antiprotons.” Nature, vol. 527, no. 7578, Nov. 2015, pp. 345–48. Scopus, doi:10.1038/nature15724. Full Text

Adamczyk, L., et al. “Energy dependence of acceptance-corrected dielectron excess mass spectrum at mid-rapidity in Au+Au collisions at √sNN=19.6 and 200 GeV.” Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics, vol. 750, Nov. 2015, pp. 64–71. Scopus, doi:10.1016/j.physletb.2015.08.044. Full Text

Oswald, C., et al. “Semi-inclusive studies of semileptonic Bs decays at Belle.” Physical Review D  Particles, Fields, Gravitation and Cosmology, vol. 92, no. 7, Oct. 2015. Scopus, doi:10.1103/PhysRevD.92.072013. Full Text

Adare, A., et al. “Measurements of Elliptic and Triangular Flow in High-Multiplicity 3He+Au Collisions at √(s(NN))=200 GeV..” Physical Review Letters, vol. 115, no. 14, Oct. 2015. Epmc, doi:10.1103/physrevlett.115.142301. Full Text

Tamponi, U., et al. “First Observation of the Hadronic Transition ϒ(4S)→ηh(b)(1P) and New Measurement of the h(b)(1P) and η(b)(1S) Parameters..” Physical Review Letters, vol. 115, no. 14, Oct. 2015. Epmc, doi:10.1103/physrevlett.115.142001. Full Text

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