Transverse spin structure of the nucleon from lattice QCD simulations

Göckeler, M. and Hagler, Ph. and Horsley, R. and Nakamura, Y. and Pleiter, D. and Rakow, P.E.L. and Schäfer, A. and Schierholz, G. and Stüben, H. and Zanotti, J.M. (2007) Transverse spin structure of the nucleon from lattice QCD simulations. Physical Review Letters, 98. ISSN 1550-2368 (online); 1550-7998 (print)

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Abstract

We present the first calculation in lattice QCD of the lowest two moments of transverse spin densities of quarks in the nucleon. They encode correlations between quark spin and orbital angular momentum. Our dynamical simulations are based on two flavors of clover-improved Wilson fermions and Wilson gluons. We find significant contributions from certain quark helicity flip generalized parton distributions, leading to strongly distorted densities of transversely polarized quarks in the nucleon. In particular, based on our results and recent arguments by Burkardt [Phys. Rev. D 72 (2005) 094020], we predict that the Boer-Mulders-function $h_1^\perp$, describing correlations of transverse quark spin and intrinsic transverse momentum of quarks, is large and negative for both up and down quarks.

Item Type: Article
Additional Information: LTH 734; arXiv Number: arXiv:hep-lat/0612032v1. 4 Pages. Published 29 May 2007. Issue: 1 June 2007.
Uncontrolled Keywords: GENERALIZED PARTON DISTRIBUTIONS; NONPERTURBATIVE RENORMALIZATION; HELICITY FLIP; ASYMMETRIES; OPERATORS
Subjects: Q Science > QC Physics
Divisions: ?? dep_math ??
Depositing User: Adina Dudau
Date Deposited: 27 Oct 2008 10:58
Last Modified: 09 Oct 2014 12:00
URI: http://repository.liv.ac.uk/id/eprint/280

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