# Bonn 2001 – wissenschaftliches Programm

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# T: Teilchenphysik

## T 203: QCD 2

### T 203.1: Vortrag

### Dienstag, 27. März 2001, 14:00–14:15, HS XII

**Parton distribution functions from nonlocal LC-operators with definite twist** — •Bodo Geyer and Markus Lazar — Institut f. Theoret. Physik, Univ. Leipzig

New quark distribution functions are introduced as forward matrix
elements of appropriate bilocal quark operators with well-defined
geometric twist (= dimension - spin). These distribution functions
of pure twist by explicitly taking into account the necessary trace
terms correspond to an infinte tower of irreducible representations
of the Lorentz group. Obviously, they differ from the conventional
ones which are introduced by counting powers of 1/*Q*^{2}. The unique
relations between both kinds of distribution functions are given.
The mismatch of the conventional ones with respect to pure geometric
twist leads to Wandzura-Wilczek–like relations most of which are
new and could be verified experimentally.

Reference: hep-ph/0009309;
see also:
Nucl. Phys. **B 559** (1999) 339, hep-th/9901090
Nucl. Phys. **B 581** (2000) 341, hep-th/0003080.