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)

Waheed, E., et al. “Measurement of the CKM matrix element.” Physical Review D, vol. 100, no. 5, Sept. 2019. Scopus, doi:10.1103/PhysRevD.100.052007. Full Text

Jia, S., et al. “Search for ω (2012) →k Ξ (1530) →kπ Ξ at Belle.” Physical Review D, vol. 100, no. 3, Aug. 2019. Scopus, doi:10.1103/PhysRevD.100.032006. Full Text

Chou, P. C., et al. “Search for B0 →x (3872)γ.” Physical Review D, vol. 100, no. 1, July 2019. Scopus, doi:10.1103/PhysRevD.100.012002. Full Text

Adare, A., et al. “Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions.Physical Review Letters, vol. 123, no. 2, July 2019, p. 022301. Epmc, doi:10.1103/physrevlett.123.022301. Full Text

Seidl, R., et al. “Transverse momentum dependent production cross sections of charged pions, kaons and protons produced in inclusive e+e- annihilation at s =10.58 GeV.” Physical Review D, vol. 99, no. 11, June 2019. Scopus, doi:10.1103/PhysRevD.99.112006. Full Text

Adam, J., et al. “Azimuthal Harmonics in Small and Large Collision Systems at RHIC Top Energies.Physical Review Letters, vol. 122, no. 17, May 2019, p. 172301. Epmc, doi:10.1103/physrevlett.122.172301. Full Text

Adam, J., et al. “Collision-energy dependence of pt correlations in Au + Au collisions at energies available at the BNL Relativistic Heavy Ion Collider.” Physical Review C, vol. 99, no. 4, Apr. 2019. Scopus, doi:10.1103/PhysRevC.99.044918. Full Text

Adam, J., et al. “Centrality and transverse momentum dependence of D0 -meson production at mid-rapidity in Au + Au collisions at s NN =200 GeV.” Physical Review C, vol. 99, no. 3, Mar. 2019. Scopus, doi:10.1103/PhysRevC.99.034908. Full Text

Adamczyk, L., et al. “Constraining the initial conditions and temperature dependent viscosity with three-particle correlations in Au+Au collisions.” Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics, vol. 790, Mar. 2019, pp. 81–88. Scopus, doi:10.1016/j.physletb.2018.10.075. Full Text

Adam, J., et al. “The proton–Ω correlation function in Au + Au collisions at s NN =200GeV.” Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics, vol. 790, Mar. 2019, pp. 490–97. Scopus, doi:10.1016/j.physletb.2019.01.055. Full Text

Pages

Seidl, R., et al. “Fragmentation function measurements at Belle.” Aip Conference Proceedings, vol. 1418, 2011, pp. 51–55. Scopus, doi:10.1063/1.3667303. Full Text

Adachi, I., et al. “Observation of two charged bottomonium-like resonances.” Proceedings of the 9th International Conference on Flavor Physics and Cp Violation, Fpcp 2011, 2011.

Vossen, A. “Forward transverse single spin asymmetries at PHENIX.” Journal of Physics: Conference Series, vol. 316, no. 1, 2011. Scopus, doi:10.1088/1742-6596/316/1/012004. Full Text

Adachi, I., et al. “Observation of two charged bottomonium-like resonances.” Proceedings of the 9th International Conference on Flavor Physics and Cp Violation, Fpcp 2011, 2011.

Dharmawardane, V., and A. Vossen. “Transverse spin results from PHENIX.” Proceedings of Science, 2010.

Vossen, A. “Future PHENIX calorimetry and trigger upgrades.” Proceedings of Science, 2010.

Dharmawardane, V., and A. Vossen. “Transverse spin results from PHENIX.” Proceedings of Science, 2010.

Vossen, A., et al. “Measurement of transverse spin dependent fragmentation functions at Belle.” Aip Conference Proceedings, vol. 1149, 2009, pp. 433–38. Scopus, doi:10.1063/1.3215683. Full Text

Vossen, A. “Basics of feature selection and statistical learning for high-energy physics.” Inverted Cern School of Computing, Icsc 2005 and Icsc 2006  Proceedings, 2008, pp. 1–12.

Vossen, A. “Support vector machines in high-energy physics.” Inverted Cern School of Computing, Icsc 2005 and Icsc 2006  Proceedings, 2008, pp. 23–33.

Pages