München 2009 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 13: QCD (Theorie) 3 / Elektroschwache Physik (Theorie)

T 13.2: Vortrag

Mittwoch, 11. März 2009, 17:00–17:15, M109

Baryon operators of higher twist in QCD — Vladimir Braun¹, Alexander Manashov^1,2, and •Jürgen Rohrwild¹ — ¹Universtität Regensburg, Regensburg, Germany — ²Sankt-Petersburg State Univ., St.-Petersburg, Russia

In hard QCD processes the effects of higher twist contributions correspond to corrections which are suppressed by powers of the hard scale and are therefore relevant if high accuracy is required. The scale dependence of a physical observable is governed by the renormalization of the higher-twist operators.

In the case of baryon operators the anomalous dimensions of the operators of twist 3 have been studied numerously and an almost complete understanding has been achieved. However, starting with twist 4 non-quasipartonic operators (i.e. operators whose twist is larger than their number of parton fields) enter the game and the number of independent operators increases significantly. Making heavy use of conformal symmetry, which prescribes the one-loop renormalization to a certain extent, we will see that the construction of an advantageous operator basis is possible and the full spectrum of anomalous dimensions can be obtained.