Journal Article

PUBDB-2021-05530

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Quark and Gluon Momentum Fractions in the Pion from $N_f=2+1+1$ Lattice QCD

Alexandrou, C. ; Bacchio, S. ; Bergner, G. ; Finkenrath, J. ; Gasbarro, A. ; Hadjiyiannakou, K. ; Jansen, K.DESY* ; Kostrzewa, B.Extern* ; Ottnad, K. ; Petschlies, M. ; Pittler, F. ; Steffens, F. ; Urbach, C. ; Wenger, U. ; Mass, E. T. (Collaboration Author)

2021
APS College Park, Md.

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Please use a persistent id in citations: doi:10.1103/PhysRevLett.127.252001  doi:10.3204/PUBDB-2021-05530

Report No.: arXiv:2109.10692

Abstract: We perform the first full decomposition of the pion momentum into its gluon and quark contributions. We employ an ensemble generated by the Extended Twisted Mass Collaboration with $N_f=2+1+1$ Wilson twisted mass clover fermions at maximal twist tuned to reproduce the physical pion mass. We present our results in the $\overline{MS}$ scheme at 2 GeV. We find $⟨x⟩_{u+d}=0.601(28), ⟨x⟩_s=0.059(13), ⟨x⟩_c=0.019(05)$, and $⟨x⟩_g=0.52(11)$ for the separate contributions, respectively, whose sum saturates the momentum sum rule.

Keyword(s): mass: twist ; gluon: momentum ; fermion: clover ; pi: mass ; sum rule: momentum ; pi: momentum ; quark ; lattice field theory

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Contributing Institute(s):

1. NIC (ZEU-NIC)

Research Program(s):

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

Experiment(s):

1. No specific instrument

Appears in the scientific report 2021

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