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

## 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 |$$\widehat{p}$$| = 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.

- Authors:

- Univ. of Cyprus, Nicosia (Cyprus); The Cyprus Inst., Nicosia (Cyprus)
- Univ. of Cyprus, Nicosia (Cyprus); Univ. of Wuppertal, Wuppertal (Germany)
- Goethe-Univ. Frankfurt am Main, Frankfurt am Main (Germany); Adam Mickiewicz Univ., Poznan (Poland)
- Temple Univ., Philadelphia, PA (United States)
- The Cyprus Inst., Nicosia (Cyprus)
- John von Neumann Inst. for Computing (NIC), Zeuthen (Germany)

- Publication Date:

- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

- OSTI Identifier:
- 1567552

- Grant/Contract Number:
- PHY-1714407

- Resource Type:
- Accepted Manuscript

- Journal Name:
- EPJ Web of Conferences

- Additional Journal Information:
- Journal Volume: 175; Journal ID: ISSN 2100-014X

- Publisher:
- EDP Sciences

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

### Citation Formats

```
Alexandrou, Constantia, Bacchio, Simone, Cichy, Krzysztof, Constantinou, Martha, Hadjiyiannakou, Kyriakos, Jansen, Karl, Koutsou, Giannis, Scapellato, Aurora, and Steffens, Fernanda. Computation of parton distributions from the quasi-PDF approach at the physical point. United States: N. p., 2018.
Web. doi:10.1051/epjconf/201817514008.
```

```
Alexandrou, Constantia, Bacchio, Simone, Cichy, Krzysztof, Constantinou, Martha, Hadjiyiannakou, Kyriakos, Jansen, Karl, Koutsou, Giannis, Scapellato, Aurora, & Steffens, Fernanda. Computation of parton distributions from the quasi-PDF approach at the physical point. United States. doi:10.1051/epjconf/201817514008.
```

```
Alexandrou, Constantia, Bacchio, Simone, Cichy, Krzysztof, Constantinou, Martha, Hadjiyiannakou, Kyriakos, Jansen, Karl, Koutsou, Giannis, Scapellato, Aurora, and Steffens, Fernanda. Mon .
"Computation of parton distributions from the quasi-PDF approach at the physical point". United States. doi:10.1051/epjconf/201817514008. https://www.osti.gov/servlets/purl/1567552.
```

```
@article{osti_1567552,
```

title = {Computation of parton distributions from the quasi-PDF approach at the physical point},

author = {Alexandrou, Constantia and Bacchio, Simone and Cichy, Krzysztof and Constantinou, Martha and Hadjiyiannakou, Kyriakos and Jansen, Karl and Koutsou, Giannis and Scapellato, Aurora and Steffens, Fernanda},

abstractNote = {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 |$\widehat{p}$| = 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.},

doi = {10.1051/epjconf/201817514008},

journal = {EPJ Web of Conferences},

number = ,

volume = 175,

place = {United States},

year = {2018},

month = {3}

}

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