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

Selected Grants

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

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

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

Guan, Y., et al. “Observation of Transverse Λ/Λ[over ¯] Hyperon Polarization in e^{+}e^{-} Annihilation at Belle..” Physical Review Letters, vol. 122, no. 4, Feb. 2019. Epmc, doi:10.1103/physrevlett.122.042001. Full Text

Adam, J., et al. “J/ψ production cross section and its dependence on charged-particle multiplicity in p + p collisions at s=200 GeV.” Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics, vol. 786, Nov. 2018, pp. 87–93. Scopus, doi:10.1016/j.physletb.2018.09.029. Full Text

Adamczyk, L., et al. “Collision energy dependence of moments of net-kaon multiplicity distributions at RHIC.” Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics, vol. 785, Oct. 2018, pp. 551–60. Scopus, doi:10.1016/j.physletb.2018.07.066. Full Text

Xu, Q. N., et al. “Measurement of ηc (1S), ηc (2S), and nonresonant η′π+π- production via two-photon collisions.” Physical Review D, vol. 98, no. 7, Oct. 2018. Scopus, doi:10.1103/PhysRevD.98.072001. Full Text

Adamczyk, L., et al. “Harmonic decomposition of three-particle azimuthal correlations at energies available at the BNL Relativistic Heavy Ion Collider.” Physical Review C, vol. 98, no. 3, Sept. 2018. Scopus, doi:10.1103/PhysRevC.98.034918. Full Text

Adam, J., et al. “Beam energy dependence of rapidity-even dipolar flow in Au+Au collisions.” Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics, vol. 784, Sept. 2018, pp. 26–32. Scopus, doi:10.1016/j.physletb.2018.07.013. Full Text

Adam, J., et al. “Low-p_{T} e^{+}e^{-} Pair Production in Au+Au Collisions at sqrt[s_{NN}]=200  GeV and U+U Collisions at sqrt[s_{NN}]=193  GeV at STAR..” Physical Review Letters, vol. 121, no. 13, Sept. 2018. Epmc, doi:10.1103/physrevlett.121.132301. Full Text

Adam, J., et al. “Correlation measurements between flow harmonics in Au+Au collisions at RHIC.” Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics, vol. 783, Aug. 2018, pp. 459–65. Scopus, doi:10.1016/j.physletb.2018.05.076. Full Text

Adare, A., et al. “Cross section and longitudinal single-spin asymmetry AL for forward W± →μ±ν production in polarized p+p collisions at s =510 GeV.” Physical Review D, vol. 98, no. 3, Aug. 2018. Scopus, doi:10.1103/PhysRevD.98.032007. Full Text

Pages

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. 967, 2017, pp. 996–1003. Scopus, doi:10.1016/S0375-9474(17)30382-2. Full Text

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. 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

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.

Pages