[Hadstruct] [EXTERNAL] Re: Quark Helicity Published

[Monahan, Christopher]

Congratulations! Thank you, Colin!

Regards,
Chris
________________________________
From: Hadstruct <hadstruct-bounces at jlab.org> on behalf of David Richards via Hadstruct <hadstruct at jlab.org>
Sent: 20 March 2023 11:10
To: Colin Egerer <cegerer at jlab.org>
Cc: hadstruct at jlab.org <hadstruct at jlab.org>
Subject: Re: [Hadstruct] Quark Helicity Published

Hi Colin,

That is great news!

David

On Mar 20, 2023, at 10:28 AM, Colin Egerer via Hadstruct <hadstruct at jlab.org<mailto: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=DwIFCQ&c=CJqEzB1piLOyyvZjb8YUQw&r=phC8jtUHUVIl1OXaA25HKnc5L16EvLwhrqx4rXYGPWA&m=92TXa6Mymc4HFiEgEpT5fTFRxphMxDL4tFH5fba-VPyH5_4mD98T77pMFYnXa7tK&s=HhWaxushBEvgsFAcUOyyt1QtDwab7gB966uJfamhY8w&e= <https://urldefense.proofpoint.com/v2/url?u=https-3A__nam11.safelinks.protection.outlook.com_-3Furl-3Dhttps-253A-252F-252Flink.springer.com-252Farticle-252F10.1007-252FJHEP03-282023-29086-26data-3D05-257C01-257Ccjmonahan-2540wm.edu-257C4072e926b8ba4f12546008db29556fd2-257Cb93cbc3e661d40588693a897b924b8d7-257C0-257C0-257C638149219162734255-257CUnknown-257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0-253D-257C3000-257C-257C-257C-26sdata-3DvNraVLfeQ7-252BgNXJX2UoEJufe9LuXXn2E444BG-252FIwR1s-253D-26reserved-3D0&d=DwIFCQ&c=CJqEzB1piLOyyvZjb8YUQw&r=phC8jtUHUVIl1OXaA25HKnc5L16EvLwhrqx4rXYGPWA&m=92TXa6Mymc4HFiEgEpT5fTFRxphMxDL4tFH5fba-VPyH5_4mD98T77pMFYnXa7tK&s=1dbew8VyUedzoh814GrPaTIXD6Ek_BqeHroBYmfLdzc&e= >
[https://urldefense.proofpoint.com/v2/url?u=https-3A__media.springernature.com_w200_springer-2Dstatic_cover_journal_13130.jpg&d=DwIFCQ&c=CJqEzB1piLOyyvZjb8YUQw&r=phC8jtUHUVIl1OXaA25HKnc5L16EvLwhrqx4rXYGPWA&m=92TXa6Mymc4HFiEgEpT5fTFRxphMxDL4tFH5fba-VPyH5_4mD98T77pMFYnXa7tK&s=dzMKsv6Iy0MwBJOsN6tZBcmYtiVHw0cEhQ9YM3HaNV8&e= ]<https://urldefense.proofpoint.com/v2/url?u=https-3A__nam11.safelinks.protection.outlook.com_-3Furl-3Dhttps-253A-252F-252Flink.springer.com-252Farticle-252F10.1007-252FJHEP03-282023-29086-26data-3D05-257C01-257Ccjmonahan-2540wm.edu-257C4072e926b8ba4f12546008db29556fd2-257Cb93cbc3e661d40588693a897b924b8d7-257C0-257C0-257C638149219162734255-257CUnknown-257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0-253D-257C3000-257C-257C-257C-26sdata-3DvNraVLfeQ7-252BgNXJX2UoEJufe9LuXXn2E444BG-252FIwR1s-253D-26reserved-3D0&d=DwIFCQ&c=CJqEzB1piLOyyvZjb8YUQw&r=phC8jtUHUVIl1OXaA25HKnc5L16EvLwhrqx4rXYGPWA&m=92TXa6Mymc4HFiEgEpT5fTFRxphMxDL4tFH5fba-VPyH5_4mD98T77pMFYnXa7tK&s=1dbew8VyUedzoh814GrPaTIXD6Ek_BqeHroBYmfLdzc&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__nam11.safelinks.protection.outlook.com_-3Furl-3Dhttps-253A-252F-252Flink.springer.com-252Farticle-252F10.1007-252FJHEP03-282023-29086-26data-3D05-257C01-257Ccjmonahan-2540wm.edu-257C4072e926b8ba4f12546008db29556fd2-257Cb93cbc3e661d40588693a897b924b8d7-257C0-257C0-257C638149219162734255-257CUnknown-257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0-253D-257C3000-257C-257C-257C-26sdata-3DvNraVLfeQ7-252BgNXJX2UoEJufe9LuXXn2E444BG-252FIwR1s-253D-26reserved-3D0&d=DwIFCQ&c=CJqEzB1piLOyyvZjb8YUQw&r=phC8jtUHUVIl1OXaA25HKnc5L16EvLwhrqx4rXYGPWA&m=92TXa6Mymc4HFiEgEpT5fTFRxphMxDL4tFH5fba-VPyH5_4mD98T77pMFYnXa7tK&s=1dbew8VyUedzoh814GrPaTIXD6Ek_BqeHroBYmfLdzc&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<https://urldefense.proofpoint.com/v2/url?u=https-3A__nam11.safelinks.protection.outlook.com_-3Furl-3Dhttp-253A-252F-252Flink.springer.com-252F-26data-3D05-257C01-257Ccjmonahan-2540wm.edu-257C4072e926b8ba4f12546008db29556fd2-257Cb93cbc3e661d40588693a897b924b8d7-257C0-257C0-257C638149219162734255-257CUnknown-257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0-253D-257C3000-257C-257C-257C-26sdata-3DUvQNgptn8teRLTEPEtaIrPFl1JqKxeRUV3BVcUCrNJg-253D-26reserved-3D0&d=DwIFCQ&c=CJqEzB1piLOyyvZjb8YUQw&r=phC8jtUHUVIl1OXaA25HKnc5L16EvLwhrqx4rXYGPWA&m=92TXa6Mymc4HFiEgEpT5fTFRxphMxDL4tFH5fba-VPyH5_4mD98T77pMFYnXa7tK&s=ulETQrEBw3PM1Pq2WkHk8RnqThBePVL5aqb_Z-UngPs&e= >

Best,
Colin
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