Bochum 2009 – scientific programme
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HK: Fachverband Hadronen und Kerne
HK 14: Hadron Structure and Spectroscopy II
HK 14.6: Talk
Monday, March 16, 2009, 18:15–18:30, H-ZO 30
Moments of Parton Distribution Functions from Lattice QCD — Marina Dorati1, •Thomas Hemmert2, and Andreas Schäfer2 — 1Universita degli Studi di Pavia, Italy — 2Universität Regensburg, Germany
We present results for the first isovector moment <x>_u-d of the unpolarized parton distribution functions at next-to-leading one-loop order in Baryon Chiral Perturbation Theory, extending the work of ref.[1] to the next order. The first isovector moment <Delta x>_u-d of the polarized parton distribution functions is also presented at next-to-leading one-loop order. Both chiral extrapolation functions are then fitted simultaneously to Lattice QCD data from the LHPC, QCDSF and RBC collaborations. The convergence behavior of the chiral series for the conflicting data sets is studied and a critical discussion of the resulting extrapolated values at the physical point is presented.
[1] M. Dorati, T.A. Gail and T.R. Hemmert, Nucl. Phys. A798, 96 (2008)