Recent progress in lattice calculations of nucleon structure functions is reported, with emphasis on generalized parton distributions.
Nucleon structure from lattice QCD
β Scribed by J. M. Zanotti
- Book ID
- 111632927
- Publisher
- Springer-Verlag
- Year
- 2007
- Tongue
- English
- Weight
- 623 KB
- Volume
- 140
- Category
- Article
- ISSN
- 1951-6355
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π SIMILAR VOLUMES
We report the current status of RBCK calculations on nucleon structure with both quenched and unquenched lattice &CD. The combination of domain wall fermions and DBW2 gauge action works well for quantities like isovector vector and axial charges, moments of structure functions (ST),, dl, and (l)ap,
A genuinely non-perturbative evaluation of higher-twist contributions to the structure functions of the nucleon, with all mixing effects and renormalon ambiguities taken care of, is presented. Higher-twist corrections turn out to be significant at moderate values of q2.
The flavor singlet axial and tensor charges of the nucleon are calculated in lattice QCD. We find AE = Au + Ad+ As = +0.638(54) --0.347(46) --0.109(30) = +0.18(10) for the axial charge and 5E = 5u + 5d + 5s = +0.839(60) -0.231(55) -0.046(34) = +0.562(88) for the tensor charge. The result for the axi