[Hadstruct] [EXTERNAL] Re: Quark Helicity Published

[Savvas Zafeiropoulos]

Hi Colin,

Congrats! And thanks a lot for everything!

Best wishes,
Savvas

On Mon, Mar 20, 2023, 3:28 PM Colin Egerer via Hadstruct <hadstruct at jlab.org>
wrote:

> Hi All,
>
> As the title states, the quark helicity paper is published now with JHEP:
> https://urldefense.proofpoint.com/v2/url?u=https-3A__link.springer.com_article_10.1007_JHEP03-282023-29086&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=phC8jtUHUVIl1OXaA25HKnc5L16EvLwhrqx4rXYGPWA&m=e9wlsiJelP2iwXfZCn3zdX1HH4tStmDZGOdaZlh9u-4vlU9Q-8kcDxokkTTTBtB9&s=UaHvIAArYCw3X4hyCcrwWmbBOhjW1CvYhS61_hwT5Cg&e= 
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__link.springer.com_article_10.1007_JHEP03-282023-29086&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=phC8jtUHUVIl1OXaA25HKnc5L16EvLwhrqx4rXYGPWA&m=e9wlsiJelP2iwXfZCn3zdX1HH4tStmDZGOdaZlh9u-4vlU9Q-8kcDxokkTTTBtB9&s=UaHvIAArYCw3X4hyCcrwWmbBOhjW1CvYhS61_hwT5Cg&e= >
> Non-singlet quark helicity PDFs of the nucleon from pseudo-distributions -
> Journal of High Energy Physics
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__link.springer.com_article_10.1007_JHEP03-282023-29086&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=phC8jtUHUVIl1OXaA25HKnc5L16EvLwhrqx4rXYGPWA&m=e9wlsiJelP2iwXfZCn3zdX1HH4tStmDZGOdaZlh9u-4vlU9Q-8kcDxokkTTTBtB9&s=UaHvIAArYCw3X4hyCcrwWmbBOhjW1CvYhS61_hwT5Cg&e= >
> 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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