Second moment of the pion distribution amplitude with the momentum smearing technique

Bibliographic description

punktacja MEiN [2017 A]: 40

title:	Second moment of the pion distribution amplitude with the momentum smearing technique
author:	Bali G. S., Braun V. M., Göckeler M., Gruber M., Hutzler F., Korcyl Piotr , Lang B., Schäfer A.
journal title:	Physics Letters. B
volume:	774
date of publication :	2017
pages:	91-97
ISSN:	0370-2693
eISSN:	1873-2445
DOI:	10.1016/j.physletb.2017.08.077
language:	English
journal language:	English
abstract in English:	Using the second moment of the pion distribution amplitude as an example, we investigate whether lattice calculations of matrix elements of local operators involving covariant derivatives may benefit from the recently proposed momentum smearing technique for hadronic interpolators. Comparing the momentum smearing technique to the traditional Wuppertal smearing we find—at equal computational cost—a considerable reduction of the statistical errors. The present investigation was carried out using N_{f}=2+1 dynamical non-perturbatively order a improved Wilson fermions on lattices of different volumes and pion masses down to 220 MeV.
keywords in English:	lattice QCD, pion wave function
affiliation:	Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
type:	journal article
subtype:	academic paper