Working Group 6 Summary: Spin and 3D Structure

Eyser, O.; Parsamyan, B.; Rogers, T. C.

doi:10.22323/1.352.0284

Cited by 2 publications

(4 citation statements)

References 52 publications

(58 reference statements)

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“…refs. [4][5][6] for experimental reviews. It is also a key scientific goal of the upcoming EIC [7,8], and direct calculations of these functions from lattice have recently attracted much attention, see e.g.…”

Section: Introductionmentioning

confidence: 99%

Factorization for azimuthal asymmetries in SIDIS at next-to-leading power

Ebert

Gao

Stewart

2022

J. High Energ. Phys.

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Differential measurements of the semi-inclusive deep inelastic scattering (SIDIS) process with polarized beams provide important information on the three-dimensional structure of hadrons. Among the various observables are azimuthal asymmetries that start at subleading power, and which give access to novel transverse momentum dependent distributions (TMDs). Theoretical predictions for these distributions are currently based on the parton model rather than a rigorous factorization based analysis. Working under the assumption that leading power Glauber interactions do not spoil factorization at this order, we use the Soft Collinear Effective Theory to derive a complete factorization formula for power suppressed hard scattering effects in SIDIS. This yields generalized definitions of the TMDs that depend on two longitudinal momentum fractions (one of them only relevant beyond tree level), and a complete proof that only the same leading power soft function appears and can be absorbed into the TMD distributions at this order. We also show that perturbative corrections can be accounted for with only one new hard coefficient. Factorization formulae are given for all spin dependent structure functions which start at next-to-leading power. Prospects for improved subleading power predictions that include resummation are discussed.

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Section: Introductionmentioning

confidence: 99%

Factorization for azimuthal asymmetries in SIDIS at next-to-leading power

Ebert

Gao

Stewart

2022

J. High Energ. Phys.

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“…, where the quarks q f have charge 6 Throughout the body of the paper we work with equations that are gauge invariant under covariant gauge transformations, where the gauge fields vanish at infinity. To restore complete gauge invariance, such as in light-cone gauges, requires including transverse Wilson lines [108][109][110].…”

Section: (I) Hardmentioning

confidence: 99%

“…non-trivial, since it involved commuting P ⊥ and S(b T ), and the argument for this was given in section 4. 6.…”

Section: A Coordinate Systemsmentioning

confidence: 99%

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Factorization for Azimuthal Asymmetries in SIDIS at Next-to-Leading Power

Ebert,

Gao,

Stewart

2021

Preprint

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Working Group 6 Summary: Spin and 3D Structure

Cited by 2 publications

References 52 publications

Factorization for azimuthal asymmetries in SIDIS at next-to-leading power

Factorization for azimuthal asymmetries in SIDIS at next-to-leading power

Factorization for Azimuthal Asymmetries in SIDIS at Next-to-Leading Power

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