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.

My group also works on precision tests of the flavor sector of the standard model at the intensity frontier. To this end we study the properties of B meson detected with the Belle II experiment.

Education & Training

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

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

Fellowships, Supported Research, & Other Grants

Research in High Energy Physics at Duke University awarded by US Department of Energy (2019 to 2020)

Adare, A., et al. “J/ψ suppression at forward rapidity in Au + Au collisions at √sNN=39 and 62.4 GeV.” Physical Review C  Nuclear Physics, vol. 86, no. 6, Dec. 2012. Scopus, doi:10.1103/PhysRevC.86.064901. Full Text

Adamczyk, L., et al. “Inclusive charged hadron elliptic flow in Au + Au collisions at √sNN=7.7-39 GeV.” Physical Review C  Nuclear Physics, vol. 86, no. 5, Nov. 2012. Scopus, doi:10.1103/PhysRevC.86.054908. Full Text

Adamczyk, L., et al. “Measurements of D0 and D * production in p+p collisions at √s=200GeV.” Physical Review D  Particles, Fields, Gravitation and Cosmology, vol. 86, no. 7, Oct. 2012. Scopus, doi:10.1103/PhysRevD.86.072013. Full Text

Adare, A., et al. “Evolution of π(0) suppression in Au+Au collisions from √(s(NN))=39 to 200 GeV.Physical Review Letters, vol. 109, no. 15, Oct. 2012, p. 152301. Epmc, doi:10.1103/physrevlett.109.152301. Full Text

Adamczyk, L., et al. “Transverse single-spin asymmetry and cross section for π0 and η mesons at large Feynman x in p →+p collisions at √s=200GeV.” Physical Review D  Particles, Fields, Gravitation and Cosmology, vol. 86, no. 5, Sept. 2012. Scopus, doi:10.1103/PhysRevD.86.051101. Full Text

Adamczyk, L., et al. “Longitudinal and transverse spin asymmetries for inclusive jet production at mid-rapidity in polarized p+p collisions at √s=200GeV.” Physical Review D  Particles, Fields, Gravitation and Cosmology, vol. 86, no. 3, Aug. 2012. Scopus, doi:10.1103/PhysRevD.86.032006. Full Text

Adamczyk, L., et al. “Di-electron spectrum at mid-rapidity in p+p collisions at √s=200 GeV.” Physical Review C  Nuclear Physics, vol. 86, no. 2, Aug. 2012. Scopus, doi:10.1103/PhysRevC.86.024906. Full Text

Agakishiev, G., et al. “Energy and system-size dependence of two- and four-particle v2 measurements in heavy-ion collisions at √sNN=62.4 and 200 GeV and their implications on flow fluctuations and nonflow.” Physical Review C  Nuclear Physics, vol. 86, no. 1, July 2012. Scopus, doi:10.1103/PhysRevC.86.014904. Full Text

Adolph, C., et al. “Transverse spin effects in hadron-pair production from semi-inclusive deep inelastic scattering.” Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics, vol. 713, no. 1, June 2012, pp. 10–16. Scopus, doi:10.1016/j.physletb.2012.05.015. Full Text

Adamczyk, L., et al. “Measurement of the W→eν and Z/γ *→e +e - production cross sections at mid-rapidity in proton-proton collisions at √s=500GeV.” Physical Review D  Particles, Fields, Gravitation and Cosmology, vol. 85, no. 9, May 2012. Scopus, doi:10.1103/PhysRevD.85.092010. Full Text

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