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. “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, p. 142301. Epmc, doi:10.1103/physrevlett.115.142301. Full Text

Kronenbitter, B., et al. “Measurement of the branching fraction of B+ →τ+ντ decays with the semileptonic tagging method.” Physical Review D  Particles, Fields, Gravitation and Cosmology, vol. 92, no. 5, Sept. 2015. Scopus, doi:10.1103/PhysRevD.92.051102. Full Text

Choi, S. K., et al. “Erratum: Publisher's Note: Measurements of B → D ¯ Ds0∗+ (2317) decay rates and a search for isospin partners of the Ds0∗+ (2317) (Physical Review D - Particles, Fields, Gravitation and Cosmology (2015) 91 (092011)).” Physical Review D  Particles, Fields, Gravitation and Cosmology, vol. 92, no. 3, Aug. 2015. Scopus, doi:10.1103/PhysRevD.92.039905. Full Text

Adamczyk, L., et al. “Precision Measurement of the Longitudinal Double-Spin Asymmetry for Inclusive Jet Production in Polarized Proton Collisions at sqrt[s]=200  GeV.Physical Review Letters, vol. 115, no. 9, Aug. 2015, p. 092002. Epmc, doi:10.1103/physrevlett.115.092002. Full Text

Adamczyk, L., et al. “Measurements of dielectron production in Au + Au collisions at sNN =200 GeV from the STAR experiment.” Physical Review C  Nuclear Physics, vol. 92, no. 2, Aug. 2015. Scopus, doi:10.1103/PhysRevC.92.024912. Full Text

Adamczyk, L., et al. “Energy dependence of Kπ, pπ, and Kp fluctuations in Au + Au collisions from sNN =7.7 to 200 GeV ENERGY DEPENDENCE of Kπ, pπ, and Kp ... L. ADAMCZYK et al.Physical Review C  Nuclear Physics, vol. 92, no. 2, Aug. 2015. Scopus, doi:10.1103/PhysRevC.92.021901. Full Text

Han, Y. L., et al. “Measurement of e+e- →γχcJ via initial state radiation at Belle.” Physical Review D  Particles, Fields, Gravitation and Cosmology, vol. 92, no. 1, July 2015. Scopus, doi:10.1103/PhysRevD.92.012011. Full Text

Adamczyk, L., et al. “Beam-energy-dependent two-pion interferometry and the freeze-out eccentricity of pions measured in heavy ion collisions at the STAR detector.” Physical Review C  Nuclear Physics, vol. 92, no. 1, July 2015. Scopus, doi:10.1103/PhysRevC.92.014904. Full Text

Pal, B., et al. “Evidence for the decay B0 →ηπ0.” Physical Review D  Particles, Fields, Gravitation and Cosmology, vol. 92, no. 1, July 2015. Scopus, doi:10.1103/PhysRevD.92.011101. Full Text

Adamczyk, L., et al. “Long-range pseudorapidity dihadron correlations in d + Au collisions at √sNN = 200 GeV.” Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics, vol. 747, July 2015, pp. 265–71. Scopus, doi:10.1016/j.physletb.2015.05.075. Full Text

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