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Moments of nucleon distribution amplitudes from irreducible three-quark operators

Göckeler, M.; Horlsley, R.; Kaltenbrunner, T.; Nakamura, Y.; Pleiter, D.; Rakow, P.E.L.; Schäfer, A.; Schierholz, G.; Stüben, H.; Warkentin, N. and Zanotti, J.M. (2007) Moments of nucleon distribution amplitudes from irreducible three-quark operators. In: The XXV International Symposium on Lattice Field Theory, July 30 - August 4 2007, Regensburg, Germany.

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Abstract

Semi-exclusive and exclusive processes are becoming more and more important in high energy physics since they are excellently suited to study the internal hadronic structure. To analyze such processes the knowledge of the hadron distribution amplitudes, which are universal for different reactions, is essential. Only rather indirect information on these nonperturbative functions can be obtained from measurements. In this work we report on a lattice QCD computation of moments of nucleon distribution amplitudes using suitable three-quark operators. However, these operators have to be renormalized and the mixing is even more complicated than in the continuum. Using the symmetry group of the hypercubic lattice we therefore derive and implement irreducibly transforming three-quark operators, which allow us to control the mixing pattern and will finally lead to quantitative predictions in the MSbar scheme. We present preliminary results for leading-twist and next-to-leading twist nucleon distribution amplitudes based on the QCDSF/UKQCD simulations with 2 flavors of dynamical clover fermions.

Item Type:Conference or Workshop Item (Paper)
Additional Information:LTH 765; arXiv Number: arXiv:0710.2489v1; Additional citation information: PoS(LATTICE 2007)147. Conference ID:(LATTICE 2007. Article ID: 147. 14 pages.
Uncontrolled Keywords:high energy physics; hadronic structure; hadron distribution amplitudes; nonperturbative functions; lattice QCD; nucleon distribution amplitudes; hypercubic lattice; MS scheme; leading-twist; next-to-leading twist; nucleon distribution amplitudes; QCDSF; UKQCD; dynamical clover fermions
Subjects:Q Science > QC Physics
Departments, Research Centres and Related Units:Academic Faculties, Institutes and Research Centres > Faculty of Science > Department of Mathematical Sciences
Publisher's Statement:Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence. The author(s) and right holder(s) of such contributions grant(s) to all users a free, irrevocable, worldwide, right of access to, and a license to copy, use, distribute, transmit and display the work publicly and to make and distribute derivative works, in any digital medium for any responsible purpose, subject to proper attribution of authorship (community standards, will continue to provide the mechanism for enforcement of proper attribution and responsible use of the published work, as they do now), as well as the right to make small numbers of printed copies for their personal use.
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Refereed:Yes
Status:Published
ID Code:345
Deposited On:15 Aug 2008 14:17
Last Modified:20 May 2011 17:03

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