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

Constantia Alexandrou; Simone Bacchio; Krzysztof Cichy; Martha Constantinou; Kyriakos Hadjiyiannakou; Karl Jansen; Giannis Koutsou; Aurora Scapellato; Fernanda Steffens

doi:10.1051/epjconf/201817514008

Proceedings

Open Access

EPJ Web of Conferences 175, 14008 (2018)
https://doi.org/10.1051/epjconf/201817514008

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

Constantia Alexandrou¹^,2, Simone Bacchio¹^,3, Krzysztof Cichy⁴^,5, Martha Constantinou⁶, Kyriakos Hadjiyiannakou², Karl Jansen⁷, Giannis Koutsou², Aurora Scapellato¹^,3^* and Fernanda Steffens⁷

¹ Department of Physics, University of Cyprus, POB 20537, 1678 Nicosia, Cyprus
² The Cyprus Institute, 20 Kavafi Str., Nicosia 2121, Cyprus
³ University of Wuppertal, Gaußstr. 20, 42119 Wuppertal, Germany
⁴ Goethe-Universität Frankfurt am Main, Institut für Theoretische Physik, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
⁵ Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
⁶ Department of Physics, Temple University, Philadelphia, PA 19122 - 1801, USA
⁷ John von Neumann Institute for Computing (NIC), DESY, Platanenallee 6, 15738 Zeuthen, Germany

^* Speaker, e-mail: scapellato.aurora@ucy.ac.cy

Published online: 26 March 2018

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 N_f = 2 twisted mass cloverimproved fermions and a proton boosted with momentum = 0.83 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.

© The Authors, published by EDP Sciences, 2018

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