Updated lattice results for parton distributions
Date
2017Author
Alexandrou, ConstantiaCichy, K.
Constantinou, Martha
Hadjiyiannakou, Kyriakos
Jansen, K.
Steffens, F.
Wiese, C.
ISSN
2470-0010Source
Physical Review DVolume
96Issue
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We provide an analysis of the x dependence of the bare unpolarized, helicity, and transversity isovector parton distribution functions (PDFs) from lattice calculations employing (maximally) twisted mass fermions. The x dependence of the calculated PDFs resembles the one of the phenomenological parameterizations, a feature that makes this approach very promising. Furthermore, we apply momentum smearing for the relevant matrix elements to compute the lattice PDFs and find a large improvement factor when compared to conventional Gaussian smearing. This allows us to extend the lattice computation of the distributions to higher values of the nucleon momentum, which is essential for the prospects of a reliable extraction of the PDFs in the future. © 2017 American Physical Society.