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JAM small-$x$ helicity phenomenology
by Daniel Adamiak
Submission summary
| Authors (as registered SciPost users): | Daniel Adamiak |
| Submission information | |
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| Preprint Link: | https://arxiv.org/abs/2108.02070v2 (pdf) |
| Date submitted: | 2021-08-10 14:06 |
| Submitted by: | Adamiak, Daniel |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 28th Annual Workshop on Deep-Inelastic Scattering (DIS) and Related Subjects (DIS2021) |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approaches: | Theoretical, Phenomenological |
Abstract
We present the first-ever description the world data on the $g_1^{p,n}$ structure function at small Bjorken $x$ using evolution equations in $x$ derived from first principles QCD. This is a Monte-Carlo analysis within the JAM global framework that allows us to fit all existing polarized DIS data below $x<0.1$ as well as predict future measurements of small $x$ $g_1^{p,n}$ at the EIC. This is a necessary step in determining the quark helicity PDFs and, ultimately, the quark contribution to the proton spin.
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Report
The proceeding presents a Monte Carlo-based analysis of the world data on polarized lepton-nucleon DIS at small Bjorken-$x$ within the polarized quark dipole formalism. To our knowledge, this is the first successful description of the double-spin asymmetries in polarized DIS at $x <$ 0.1 using the KPS small-$x$ evolution equations.
The proceeding is nicely-written and the results presented here are worthy of publication.
Minor comments:
$\bullet$ on page 4, $2^{nd}$ paragraph: at teh EIC. $\rightarrow$ at the EIC.
$\bullet$ on page 5, $1^{st}$ paragraph (just before the Conclusion section): $\Delta \Sigma$ are given in 4. $\rightarrow$ $\Delta \Sigma$ are given in Fig. 4.
$\bullet$ on page 5, in the Conclusion section, $2^{nd}$ paragraph: JAM smsall-x framework $\rightarrow$ JAM small-x framework