[Hadstruct] Quark Helicity Published

[Colin Egerer]

Hi All,

As the title states, the quark helicity paper is published now with JHEP:
https://link.springer.com/article/10.1007/JHEP03(2023)086
[https://media.springernature.com/w200/springer-static/cover/journal/13130.jpg]<https://link.springer.com/article/10.1007/JHEP03(2023)086>
Non-singlet quark helicity PDFs of the nucleon from pseudo-distributions - Journal of High Energy Physics<https://link.springer.com/article/10.1007/JHEP03(2023)086>
The non-singlet helicity quark parton distribution functions (PDFs) of the nucleon are determined from lattice QCD, by jointly leveraging pseudo-distributions and the distillation spatial smearing paradigm. A Lorentz decomposition of appropriately isolated space-like matrix elements reveals pseudo-distributions that contain information on the leading-twist helicity PDFs, as well as an invariant amplitude that induces an additional z2 contamination of the leading-twist signal. An analysis of the short-distance behavior of the space-like matrix elements using matching coefficients computed to next-to-leading order (NLO) exposes the desired PDF up to this additional z2 contamination. Due to the non-conservation of the axial current, we elect to isolate the helicity PDFs normalized by the nucleon axial charge at the same scale μ2. The leading-twist helicity PDFs as well as several sources of systematic error, including higher-twist effects, discretization errors, and the aforementioned z2 contaminating amplitude
link.springer.com

Best,
Colin
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