Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2007-08-16
Phys.Rev.Lett.101:122001,2008
Physics
High Energy Physics
High Energy Physics - Lattice
4 pages, 6 figures; journal version (with original Fig.1 included); updated abstract, text and Figs. 3, 4, 5, 6; added referen
Scientific paper
10.1103/PhysRevLett.101.122001
We present the first calculation of the transverse spin structure of the pion in lattice QCD. Our simulations are based on two flavors of non-perturbatively improved Wilson fermions, with pion masses as low as 400 MeV in volumes up to (2.1 fm)^3 and lattice spacings below 0.1 fm. We find a characteristic asymmetry in the spatial distribution of transversely polarized quarks. This asymmetry is very similar in magnitude to the analogous asymmetry we previously obtained for quarks in the nucleon. Our results support the hypothesis that all Boer-Mulders functions are alike.
Brömmel Dirk
collaboration UKQCD
Diehl Markus
Göckeler Meinulf
Hägler Ph.
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