## Research Interests

- Physics of the strong interaction
- Phenomenology of hard lepton- and hadron-induced scattering processes
- QCD factorization
- Higher twist effects
- Parton correlation functions and their universality properties
- Quark- and gluon-structure of hadrons
- Spin structure of the nucleon
- Multi-dimensional imaging of strongly interacting systems

## Key Publications

**Towards an explanation of transverse single-spin asymmetries in proton-proton collisions: the role of fragmentation in collinear factorization**

K. Kanazawa Y. Koike A. Metz, and D. Pitonyak

Phys. Rev. D89, 111501(R) (2014)

**Fragmentation contribution to the transverse single-spin asymmetry in proton-proton collisions**

A. Metz and D. Pitonyak

Phys. Lett. B723, 365 (2013)

**Distribution of linearly polarized gluons inside a large nucleus**

A. Metz and J. Zhou

Phys. Rev. D84, 051503(R) (2011)

**Generalized parton correlation functions for a spin-1/2 hadron**

S. Meissner, A. Metz, and M. Schlegel

JHEP 0908, 056 (2009)

**Relations between generalized and transverse momentum dependent parton distributions: model results and beyond**

S. Meissner, A. Metz, and K. Goeke

Phys. Rev. D76, 034002 (2007)

**Semi-inclusive deep inelastic scattering at small transverse momentum**

A. Bacchetta, M. Diehl, K. Goeke, A. Metz, P. Mulders, and M. Schlegel

JHEP 0702, 093 (2007)

**Universality of soft and collinear factors in hard scattering factorization**

J. Collins and A. Metz

Phys. Rev. Lett. 93, 252001 (2004)

**Gluon exchange in spin-dependent fragmentation**

A. Metz

Phys. Lett. B 549, 139 (2002)