The $g_T(x)$ contribution to single spin asymmetries in SIDIS

Abstract

Motivated by a novel origin of transverse single spin asymmetry (SSA) in semi-inclusive Deep Inelastic Scattering (SIDIS) uncovered by some of us, we quantitatively investigate its impact on the theoretical understanding of the mechanism responsible for SSA. This new contribution from the quark-initiated channel first appears in two-loop perturbation theory and involves the $g_T(x)$ distribution. We point out another entirely analogous piece from the gluon-initiated channel proportional to the gluon helicity distribution $\Delta G(x)$. Both contributions are solely expressed in terms of twist-two polarized parton distribution functions and twist-two fragmentation functions in the Wandzura-Wilczek approximation, such that they can be unambiguously evaluated without introducing free parameters. We make predictions for measurements of the asymmetries $A_{UT}$ at the future Electron-Ion Collider (EIC), and find that $A_{UT}$ associated with the $\sin ({\varphi }_h-{\varphi }_S)$, $\sin {\varphi }_S$ and $\sin (2{\varphi }_h-{\varphi }_S)$ harmonics can reach up to 1-2\% even at the top EIC energy.

arXiv comment28 pages, 8 figures

References in corpus (28)

• FeynCalc 9.3: New features and improvements
• Semi-inclusive deep inelastic scattering at small transverse momentum
• Single-spin asymmetries: the Trento conventions
• A first unbiased global determination of polarized PDFs and their uncertainties
• Single Transverse-Spin Asymmetries in Hadronic Pion Production
• First simultaneous extraction of spin-dependent parton distributions and fragmentation functions from a global QCD analysis
• Twist-3 Formalism for Single Transverse Spin Asymmetry Reexamined: Semi-Inclusive Deep Inelastic Scattering
• Origin of single transverse-spin asymmetries in high-energy collisions
• Single-Transverse Spin Asymmetry in Semi-Inclusive Deep Inelastic Scattering
• Collins and Sivers asymmetries in muonproduction of pions and kaons off transversely polarised proton
• Single Transverse Spin Asymmetry for Large-p_T Pion Production in Semi-Inclusive Deep Inelastic Scattering
• Contribution of Twist-3 Multi-Gluon Correlation Functions to Single Spin Asymmetry in Semi-Inclusive Deep Inelastic Scattering
• A New Mechanism for Generating a Single Transverse Spin Asymmetry
• Single transverse-spin asymmetry for $D$-meson production in semi-inclusive deep inelastic scattering
• Contribution of twist-3 fragmentation function to single transverse-spin asymmetry in semi-inclusive deep inelastic scattering
• Global analysis of the Sivers functions at NLO+NNLL in QCD
• A determination of unpolarised pion fragmentation functions using semi-inclusive deep-inelastic-scattering data: MAPFF1.0
• Three-gluon contribution to the single spin asymmetry for light hadron production in pp collision
• Twist-three relations of gluonic correlators for the transversely polarized nucleon
• Master Formula for the Three-Gluon Contribution to Single Spin Asymmetry in Semi-Inclusive Deep Inelastic Scattering
• Exact Relations for Twist-3 Gluon Distribution and Fragmentation Functions from Operator Identities
• Single-spin asymmetries at two loops
• Double-spin asymmetry $A_{LT}$ in open charm production
• Transverse single-spin asymmetries of pion production in semi-inclusive DIS at subleading twist
• Transverse spin observables in hard-scattering hadronic processes within collinear factorization
• Predictions for Sivers single spin asymmetries in one- and two-hadron electroproduction at CLAS12 and EIC
• New approach to the Sivers effect in the collinear twist-3 formalism
• Predicting the $\sin {\varphi }_S$ Transverse Single-spin Asymmetry of Pion Production at an Electron Ion Collider

Cited by in corpus (8)

• First global QCD analysis of the TMD ${\mathbf{g}}_{1\mathbf{T}}$ from semi-inclusive DIS data
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• Perturbative $T$-odd asymmetries in the Drell-Yan process revisited
• On the odderon mechanism for transverse single spin asymmetry in the Wandzura-Wilczek approximation
• Gluonic contributions to semi-inclusive DIS in the target fragmentation region
• T-odd proton-helicity asymmetry in semi-inclusive DIS in perturbative QCD
• Single spin asymmetry in forward $pA$ collisions from Pomeron-Odderon interference