One-loop Renormalisation of Lattice QCD Operators for Non-forward Matrix Elements: From Clover to Overlap Fermions

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We consider the renormalisation of composite quark-antiquark operators with one and two lattice covariant derivatives related to the lowest moments of generalised parton distributions (GPDs) and meson distribution amplitudes (DAs). Their matrix elements are calculated in one-loop lattice perturbation theory for non-zero momentum transfer. Using clover and overlap fermions we present the resulting matrices of mixing and renormalisation factors. For overlap fermions we explicitly check the absence of mixing with lower-dimensional operators of different chirality in particular representations of the hypercubic group. This feature favours the use of chiral fermions.
7 pages, presented at 24th International Symposium on Lattice Field Field: Lattice 2006, Tucson, Arizona, USA, July 23-28, 2006

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High Energy Physics - Lattice

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http://salesiana.dossiersoluciones.com/handle/123456789/201231

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/hep-lat/0610060
 http://arxiv.org/abs/hep-lat/0610060
 PoSLAT2006:161,2006

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arXiv