English

Computation of parton distributions from the quasi-PDF approach at the physical point

High Energy Physics - Lattice 2018-04-18 v1

Abstract

We show the first results for parton distribution functions within the proton at the physical pion mass, employing the method of quasi-distributions. In particular, we present the matrix elements for the iso-vector combination of the unpolarized, helicity and transversity quasi-distributions, obtained with Nf=2N_f=2 twisted mass clover-improved fermions and a proton boosted with momentum p=0.83\mboxGeV|\vec{p}|=0.83\mbox{ GeV}. The momentum smearing technique has been applied to improve the overlap with the proton boosted state. Moreover, we present the renormalized helicity matrix elements in the RI' scheme, following the non-perturbative renormalization prescription recently developed by our group.

Keywords

Cite

@article{arxiv.1710.06408,
  title  = {Computation of parton distributions from the quasi-PDF approach at the physical point},
  author = {Constantia Alexandrou and Simone Bacchio and Krzysztof Cichy and Martha Constantinou and Kyriakos Hadjiyiannakou and Karl Jansen and Giannis Koutsou and Aurora Scapellato and Fernanda Steffens},
  journal= {arXiv preprint arXiv:1710.06408},
  year   = {2018}
}

Comments

8 pages, 6 figures; Proceedings of the 35th International Symposium on Lattice Field Theory, Granada, Spain