Journal Article

PUBDB-2023-03146

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Moments of the nucleon transverse quark spin densities using lattice QCD

Alexandrou, C. ; Bacchio, S. ; Constantinou, M. ; Dimopoulos, P. ; Finkenrath, J. ; Frezzotti, R. ; Hadjiyiannakou, K. (Corresponding author) ; Jansen, K.DESY* ; Kostrzewa, B. ; Koutsou, G. ; Spanoudes, G. ; Urbach, C.

2023
Inst. Woodbury, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevD.107.054504  doi:10.3204/PUBDB-2023-03146

Report No.: arXiv:2202.09871

Abstract: We present the first calculation of the Mellin moments of the transverse quark spin densities in the nucleon using lattice QCD simulations with physical values of the pion mass and in the continuum limit. Specifically, we use three $N_f=2+1+1$ twisted mass fermion gauge ensembles each at different lattice spacings. The densities are extracted from the unpolarized and transversity generalized form factors. The first moment of transversely polarized quarks in an unpolarized nucleon shows an interesting distortion, which can be traced back to the sharp falloff of the transversity generalized form factor $\bar{B}_{Tn0}(Q^2)$. The isovector tensor anomalous magnetic moment is determined to be $κ_T=1.051(94)$, which confirms a negative and large Boer-Mulders function, $h_1^⊥$, in the nucleon.

Keyword(s): quark: spin: transverse ; quark: spin: density ; spin: density ; fermion: mass: twist ; quark: mass ; nucleon ; lattice field theory ; transversity ; form factor ; magnetic moment ; isovector ; lattice ; moment ; continuum limit

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Contributing Institute(s):

1. Zeuthen Particle PhysicsTheory (Z_ZPPT)

Research Program(s):

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

Experiment(s):

1. No specific instrument

Appears in the scientific report 2023

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; ; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF >= 5 ; JCR ; SCOPUS ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Alexandrou, C. ; Bacchio, S. ; Constantinou, M. ; Dimopoulos, P. ; Finkenrath, J. ; Frezzotti, R. ; Hadjiyiannakou, K. (Corresponding author) ; Jansen, K.DESY* ; Kostrzewa, B.Extern* ; Koutsou, G. ; Spanoudes, G. ; Urbach, C.
First moments of the nucleon transverse quark spin densities using lattice QCD
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