Zusammenfassung
We present quenched lattice QCD results for the contribution of higher-twist 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 has I = 2 and receives contributions from 4-Fermi operators only. We introduce the basis of lattice operators. The renormalization of the operators is done perturbatively in ...
Zusammenfassung
We present quenched lattice QCD results for the contribution of higher-twist 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 has I = 2 and receives contributions from 4-Fermi operators only. We introduce the basis of lattice operators. The renormalization of the operators is done perturbatively in the MS scheme using the 't Hooft-Veltman prescription 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.
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