Higher-twist contribution to pion structure function: 4-Fermi operators

Citation
S. Capitani et al., Higher-twist contribution to pion structure function: 4-Fermi operators, NUCL PHYS B, 570(1-2), 2000, pp. 393-406
Citations number
14
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS B
ISSN journal
05503213 → ACNP
Volume
570
Issue
1-2
Year of publication
2000
Pages
393 - 406
Database
ISI
SICI code
0550-3213(20000320)570:1-2<393:HCTPSF>2.0.ZU;2-K
Abstract
We present quenched lattice QCD results for the contribution of higher-twis t operators to the lowest non-trivial moment of the pion structure function . To be specific, we consider the F-2(pi+) + F-2(pi-) - 2F(2 pi)(0) which h as I = 2 and receives contributions from 4-Fermi operators only. We introdu ce the basis of lattice operators. The renormalization of the operators is done perturbatively in the MS scheme using the 't Hooft-Veltman prescriptio n for gamma(5), taking particular care of mixing effects. The contribution is found to be of O(f(pi)(2)/Q(2)), relative to the leading contribution to the moment of F-2(pi+). (C) 2000 Elsevier Science B.V. All rights reserved .