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Phys. Rev. D 77, 094502 (2008) [34 pages]

Nucleon generalized parton distributions from full lattice QCD

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Ph. Hägler1, W. Schroers2,*, J. Bratt3, J. W. Negele3, A. V. Pochinsky3, R. G. Edwards4, D. G. Richards4, M. Engelhardt5, G. T. Fleming6, B. Musch1, K. Orginos4,7, and D. B. Renner8 (LHPC Collaboration)
1Institut für Theoretische Physik T39, Physik-Department der TU München, James-Franck-Straße, D-85747 Garching, Germany
2John von Neumann-Institut für Computing NIC/DESY, D-15738 Zeuthen, Germany
3Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
4Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
5Physics Department, New Mexico State University, Las Cruces, New Mexico 88003-8001, USA
6Sloane Physics Laboratory, Yale University, New Haven, Connecticut 06520, USA
7Department of Physics, College of William and Mary, Williamsburg, Virginia 23187-8795, USA
8Department of Physics, University of Arizona, 1118 E. 4th Street, Tucson, Arizona 85721, USA

Received 10 June 2007; revised 4 January 2008; published 6 May 2008

We present a comprehensive study of the lowest moments of nucleon generalized parton distributions in Nf=2+1 lattice QCD using domain-wall valence quarks and improved staggered sea quarks. Our investigation includes helicity dependent and independent generalized parton distributions for pion masses as low as 350 MeV and volumes as large as (3.5  fm)3, for a lattice spacing of 0.124 fm. We use perturbative renormalization at one-loop level with an improvement based on the nonperturbative renormalization factor for the axial vector current, and only connected diagrams are included in the isosinglet channel.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.77.094502
DOI:
10.1103/PhysRevD.77.094502
PACS:
12.38.Gc, 13.60.Fz

*Present address: Department of Physics, Center for Theoretical Sciences, National Taiwan University, Taipei 10617, Taiwan.