Spin structure of the pion

We present the first calculation of the transverse spin structure of the pion in lattice QCD. Our simulations are based on two flavors of nonperturbatively 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 character...

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Veröffentlicht in:	Physical review letters 2008-09, Vol.101 (12), p.122001-122001, Article 122001
Hauptverfasser:	Brömmel, D, Diehl, M, Göckeler, M, Hägler, Ph, Horsley, R, Nakamura, Y, Pleiter, D, Rakow, P E L, Schäfer, A, Schierholz, G, Stüben, H, Zanotti, J M
Format:	Artikel
Sprache:	eng
Schlagworte:	ASYMMETRY FLAVOR MODEL MASS MEV RANGE 100-1000 NUCLEONS PHYSICS OF ELEMENTARY PARTICLES AND FIELDS PIONS QUANTUM CHROMODYNAMICS QUARKS SIMULATION SPATIAL DISTRIBUTION SPIN
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Beschreibung
Zusammenfassung:	We present the first calculation of the transverse spin structure of the pion in lattice QCD. Our simulations are based on two flavors of nonperturbatively 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.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.101.122001