Global analysis of polarized DIS and SIDIS data with improved small-
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 helicity evolution

Adamiak, Daniel; Baldonado, Nicholas; Kovchegov, Yuri V.; Melnitchouk, W.; Pitonyak, Daniel; Sato, Nobuo; Sievert, Matthew D.; Tarasov, Andrey; Tawabutr, Yossathorn; ,

doi:10.1103/physrevd.108.114007

Phys. Rev. D

2023

DOI: 10.1103/physrevd.108.114007

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Global analysis of polarized DIS and SIDIS data with improved small- x helicity evolution

Daniel Adamiak,

Nicholas Baldonado,

Yuri V. Kovchegov

et al.

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2024

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Cited by 5 publications

References 165 publications

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The first–order factorizable contributions to the three–loop massive operator matrix elements AQg(3)<

Ablinger,

Behring,

Blümlein

et al. 2024

Nuclear Physics B

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The first–order factorizable contributions to the three–loop massive operator matrix elements AQg(3)<

Ablinger,

Behring,

Blümlein

et al. 2024

Nuclear Physics B

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Unified description of DGLAP, CSS, and BFKL evolution: TMD factorization bridging large and small x

Mukherjee,

Skokov,

Tarasov

et al. 2024

Phys. Rev. D

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This paper introduces a transverse-momentum dependent (TMD) factorization scheme designed to unify both large and small Bjorken-x regimes. We compute the next-to-leading order quantum chromodynamics (QCD) corrections to the gluon TMD operator for an unpolarized hadron within this proposed scheme. This leads to the emergence of a new TMD evolution, incorporating those in transverse momentum, rapidity, and Bjorken-x. When matched to the collinear factorization scheme, our factorization scheme faithfully reproduces the well-established Dokshitzer-Gribov-Lipatov-Altarelli-Parisi and Collins-Soper-Sterman (CSS) evolutions. Conversely, matching with high-energy factorization not only yields the Balitsky-Fadin-Kuraev-Lipatov evolution but also reveals distinctive signatures of CSS logarithms. The development of this novel TMD factorization scheme, capable of seamlessly reconciling disparate Bjorken-x regimes and faithfully reproducing established QCD evolution equations, has the potential to significantly advance our comprehension of high-energy processes and three-dimensional parton structures of hadrons. Published by the American Physical Society 2024

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Spin-flip gluon generalized transverse-momentum-dependent parton distribution F1,2 at small x

Agrawal,

Vasim,

Abir

2024

Phys. Rev. D

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Until recently the spin-flip processes in the deep inelastic scatterings are thought to be suppressed in the high energy. We found a positive intercept for the spin-flip generalized transverse momentum-dependent parton distribution (GTMDs) Re(F1,2) as Re(F1,2)∼(1x)α¯s(4 ln2−8/3)(cos3ϕkΔ+cosϕkΔ). This is done by analytically solving the integro-differential evolution equation for Re(F1,2), recently proposed by Hatta and Zhou, in the dilute regime. Interestingly, the surviving solution corresponds to conformal spin n=2 and carries an explicit cos3ϕkΔ+cosϕkΔ azimuthal dependence. As the imaginary part of F1,2, is related to the spin-dependent odderon or gluon Siver function and scales as Im(F1,2)∼x0, the positive intercept for Re(F1,2) implies that it is expected to dominate over the gluon Siver function in the small-x limit and may directly impact the modeling of unpolarized GTMDs and associated spin-flip processes. Published by the American Physical Society 2024

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Global analysis of polarized DIS and SIDIS data with improved small- x helicity evolution

Cited by 5 publications

References 165 publications

The first–order factorizable contributions to the three–loop massive operator matrix elements AQg(3)<

The first–order factorizable contributions to the three–loop massive operator matrix elements AQg(3)<

Unified description of DGLAP, CSS, and BFKL evolution: TMD factorization bridging large and small x

Spin-flip gluon generalized transverse-momentum-dependent parton distribution F1,2 at small x

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