A high-statistics study of the nucleon EM form factors, axial charge and quark momentum fraction

Publikationstyp:
Konferenzbeitrag
Metadaten:
Autoren
  • Thomas Rae
  • Benjamin Jaeger
  • Stefano Capitani
  • Michele Della Morte
  • Dalibor Djukanovic
  • Georg von Hippel
  • Bastian Knippschild
  • Harvey Meyer
  • Hartmut Wittig
DOI
10.22323/1.187.0272
Zeitschrift
Proceedings of 31st International Symposium on Lattice Field Theory LATTICE 2013 — PoS(LATTICE 2013)
Name of conference
31st International Symposium on Lattice Field Theory LATTICE 2013
Datum der Veröffentlichung
2014
Status
Published
Herausgeber
Sissa Medialab
Herausgeber URL
http://dx.doi.org/10.22323/1.187.0272
Datum der Datenerfassung
2019
Conference start date
2013
Titel
A high-statistics study of the nucleon EM form factors, axial charge and quark momentum fraction

Datenquelle: Crossref

Andere Metadatenquellen:
Abstract
We present updated results for the nucleon axial charge and electromagnetic (EM) form factors, which include a significant increase in statistics for all ensembles (up to 4000 measurements), as well as the addition of ensembles with pion masses down to $m_\pi\sim195$ MeV. We also present results for the average quark momentum fraction. The new data allows us to perform a thorough study of the systematic effects encountered in the lattice extraction. We concentrate on systematic effects due to excited-state contaminations for each of the quantities, which we check using several different time separations between the operators at the source and sink through a comparison of plateau fits and the summed operator insertion method (which provides a mechanism to suppress the excited-state contamination). We confirm our earlier finding that a reliable extraction of the axial charge must be based on a method which eliminates excited-state contaminations. Similar conclusions apply to our EM form factor calculations . The measurements are calculated using the CLS ensembles with non-perturbatively O(a) improved Wilson fermions in $N_f=2$ QCD.
Autoren
  • B Jäger
  • TD Rae
  • S Capitani
  • M Della Morte
  • D Djukanovic
  • G von Hippel
  • B Knippschild
  • HB Meyer
  • H Wittig
Autoren-URL
http://arxiv.org/abs/1311.5804v2
Schlüsselwörter
  • hep-lat
  • hep-lat
Notes
13 pages, 7 figures; talk presented at the 31st International Symposium on Lattice Field Theory (Lattice 2013), 29 July - 3 August 2013, Mainz, Germany; typos corrected, plots relabelled, conclusions unchanged
Datum der Veröffentlichung
2013
Datum der Datenerfassung
2013
Datum, an dem der Datensatz öffentlich gemacht wurde
2013
Titel
A high-statistics study of the nucleon EM form factors, axial charge and quark momentum fraction

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1311.5804v2.pdf

Datenquelle: arXiv

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