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


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

Selected Grants

Novel Experimental Probes of QCD in SIDIS and e+e- Annihilation awarded by Department of Energy (Principal Investigator). 2018 to 2023

Jefferson National Laboratory - Support for Anselm Vossen awarded by (Principal Investigator). 2018 to 2021

Fellowships, Supported Research, & Other Grants

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

Adachi, I., et al. “Search for an Invisibly Decaying Z^{'} Boson at Belle II in e^{+}e^{-}→μ^{+}μ^{-}(e^{±}μ^{∓}) Plus Missing Energy Final States.Physical Review Letters, vol. 124, no. 14, Apr. 2020, p. 141801. Epmc, doi:10.1103/physrevlett.124.141801. Full Text

Caria, G., et al. “Measurement of R(D) and R(D^{*}) with a Semileptonic Tagging Method.Physical Review Letters, vol. 124, no. 16, Apr. 2020, p. 161803. Epmc, doi:10.1103/physrevlett.124.161803. Full Text

Chu, K., et al. “Study of B →p p ππ STUDY of B →p p ππ CHU K. et al.Physical Review D, vol. 101, no. 5, Mar. 2020. Scopus, doi:10.1103/PhysRevD.101.052012. Full Text

Katrenko, P., et al. “Observation of the Radiative Decays of ϒ(1S) to χ_{c1}.Physical Review Letters, vol. 124, no. 12, Mar. 2020, p. 122001. Epmc, doi:10.1103/physrevlett.124.122001. Full Text

Abudinén, F., et al. “Measurement of the integrated luminosity of the Phase 2 data of the Belle II experiment.” Chinese Physics C, vol. 44, no. 2, Feb. 2020. Scopus, doi:10.1088/1674-1137/44/2/021001. Full Text

Anselmino, M., et al. “Transverse spin effects in hard semi-inclusive collisions.” Progress in Particle and Nuclear Physics, Jan. 2020. Scopus, doi:10.1016/j.ppnp.2020.103806. Full Text

Kou, E., et al. “The Belle II physics book.” Progress of Theoretical and Experimental Physics, vol. 2019, no. 12, Dec. 2019. Scopus, doi:10.1093/ptep/ptz106. Full Text

Li, H., et al. “Azimuthal asymmetries of back-to-back π±- (π0, η, π±) pairs in e+e- annihilation AZIMUTHAL ASYMMETRIES of BACK-TO-BACK ... H. LI et al.Physical Review D, vol. 100, no. 9, Nov. 2019. Scopus, doi:10.1103/PhysRevD.100.092008. Full Text

Jin, Y., et al. “Observation of τ- →π-ντe+e- and search for τ- →π-ντμ+μ-.” Physical Review D, vol. 100, no. 7, Oct. 2019. Scopus, doi:10.1103/PhysRevD.100.071101. Full Text

Resmi, P. K., et al. “First measurement of the CKM angle ϕ 3 withS B ± → D(KS0 π + π − π 0) K ± decays.” Journal of High Energy Physics, vol. 2019, no. 10, Oct. 2019. Scopus, doi:10.1007/JHEP10(2019)178. Full Text


Adam, J., et al. “STAR Collaboration.” Nuclear Physics A, vol. 982, 2019, pp. 1063–66. Scopus, doi:10.1016/S0375-9474(19)30014-4. Full Text

Adare, A., et al. “PHENIX Collaboration.” Nuclear Physics A, vol. 982, 2019, pp. 1053–59. Scopus, doi:10.1016/S0375-9474(19)30012-0. Full Text

Measurement of the D∗− polarization in the decay B0 → D∗−τ+ντ.” 10th International Workshop on the Ckm Unitarity Triangle, Ckm 2018, 2018.

Adamczyk, L., et al. “STAR Collaboration.” Nuclear Physics A, vol. 967, 2017, pp. 1007–10. Scopus, doi:10.1016/S0375-9474(17)30384-6. Full Text

Adare, A., et al. “PHENIX Collaboration.” Nuclear Physics A, vol. 967, 2017, pp. 996–1003. Scopus, doi:10.1016/S0375-9474(17)30382-2. Full Text

Adare, A., et al. “PHENIX Collaboration.” Nuclear Physics A, vol. 956, 2016, pp. 964–70. Scopus, doi:10.1016/S0375-9474(16)30234-2. Full Text

Adamczyk, L., et al. “STAR Collaboration.” Nuclear Physics A, vol. 956, 2016, pp. 971–74. Scopus, doi:10.1016/S0375-9474(16)30235-4. Full Text

Vossen, A. “Recent results on light quark fragmentation from belle.” Proceedings of Science, vol. 27-April-2015, 2015.

Vossen, A. “Transverse single spin and azimuthal asymmetries in hadronic collisions at star.” Epj Web of Conferences, vol. 85, 2015. Scopus, doi:10.1051/epjconf/20158502030. Full Text

Vossen, A. “Measuring transversity in polarized p+p collisions at s =200 GeV.” Aip Conference Proceedings, vol. 1560, 2013, pp. 519–21. Scopus, doi:10.1063/1.4826832. Full Text