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Quark and gluon momentum fractions in the pion from $N_f=2+1+1$ lattice QCD

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arxiv 2109.10692 v1 pith:QWC3P263 submitted 2021-09-22 hep-lat hep-ph

Constantia Alexandrou , Simone Bacchio , Georg Bergner , Jacob Finkenrath , Andrew Gasbarro , Kyriakos Hadjiyiannakou , Karl Jansen , Bartosz Kostrzewa
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Konstantin Ottnad Marcus Petschlies Ferenc Pittler Fernanda Steffens Carsten Urbach Urs Wenger
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classification hep-lathep-ph
keywords avgxmassmomentumpioncontributionsgluonquarktwisted
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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 $\overline{\mathrm{MS}}$ scheme at $2\gev$. We find $\avgx_{u+d}=0.601(28)$, $\avgx_s=0.059(13)$, $\avgx_c=0.019(05)$, and $\avgx_g=0.52(11)$ for the separate contributions, respectively, whose sum saturates the momentum sum rule.

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  1. First simultaneous global QCD analysis of kaon and pion parton distributions with lattice QCD constraints

    hep-ph 2025-10 conditional novelty 6.0 of 10

    First simultaneous pion+kaon PDF fit with lattice constraints finds kaon valence anti-up softer than pion's and strange valence more peaked at high x.

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