Preprint

PUBDB-2022-06922

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Nucleon form factors from $N_f$=2+1+1 twisted mass QCD at the physical point

Alexandrou, C. ; Bacchio, S. ; Constantinou, M. ; Finkenrath, J. ; Hadjiyiannakou, K. ; Jansen, K.DESY* ; Koutsou, G. (Corresponding author) ; Vaquero, A.

2022

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Please use a persistent id in citations: doi:10.3204/PUBDB-2022-06922

Report No.: arXiv:2112.06750

Abstract: We present the nucleon axial and electromagnetic form factors using $N_\textrm{f}$=2+1+1 ensembles of twisted mass fermions with clover improvement and with masses tuned to their physical values. Excited state effects are studied using several sink-source time separations in the range 0.8 fm - 1.6 fm, exponentially increasing statistics with the separation such that statistical errors remain approximately constant. In addition, quark loop disconnected diagrams are included in order to extract the isoscalar axial form factors and the proton and neutron electromagnetic form factors, as well as their strange-quark contributions. The radii and moments are extracted by modelling the $Q^2$ dependence, including using the so-called $z$-expansion. A preliminary assessment of lattice cut-off effects is presented using two lattice spacings directly at the physical point.

Keyword(s): form factor: electromagnetic ; mass: twist ; form factor: axial ; fermion: mass: twist ; nucleon: form factor ; error: statistical ; lattice ; clover ; statistics ; quantum chromodynamics ; isoscalar ; excited state ; quark

Note: 12 pages, 10 figures, 2 tables; proceedings of the 38th International Symposium on Lattice Field Theory (LATTICE2021), 26th-30th July, 2021, Zoom/Gather@Massachusetts Institute of Technology

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Contributing Institute(s):

1. Zeuthen Particle PhysicsTheory (Z_ZPPT)
2. Theorie (ZEU-THEO)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2022

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Database coverage:
; ; Published

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article/Contribution to a conference proceedings/Contribution to a book Alexandrou, C. ; Bacchio, S. ; Constantinou, M. ; Finkenrath, J. ; Hadjiyiannakou, K. ; Jansen, K.DESY* ; Koutsou, G. (Corresponding author) ; Vaquero, A.
Nucleon form factors from $N_f$=2+1+1 twisted mass QCD at the physical point
202238th International Symposium on Lattice Field Theory , (LATTICE2021), Zoom/Gather@Massachusetts Institute of TechnologyZoom/Gather@Massachusetts Institute of Technology, USA, 26 Jul 2021 - 30 Jul 20212021-07-262021-07-30 Proceedings of Science / International School for Advanced Studies (LATTICE2021), 250 (2022) [10.22323/1.396.0250]2022     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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