REVIEW 9 cited by
Leading-twist Single-transverse-spin asymmetries: Drell-Yan and Deep-Inelastic Scattering
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
Signed reviews
read the original abstract
Recently, Brodsky, Hwang and Schmidt have proposed a new mechanism that gives a transverse spin symmetry at leading twist in semi-inclusive deep-inelastic scattering. I show that the new mechanism is compatible with factorization and is due to an transverse-spin asymmetry in the k_T distribution of quarks in a hadron (the "Sivers asymmetry"). An earlier proof that the Sivers asymmetry vanishes because of time-reversal invariance is invalidated by the path-ordered exponential of the gluon field in the operator definition of parton densities. Instead, the time-reversal argument shows that the Sivers asymmetry is reversed in sign in hadron-induced hard processes (e.g., Drell-Yan), thereby violating naive universality of parton densities. Previous phenomenology with time-reversal-odd parton densities is therefore validated.
Forward citations
Cited by 9 Pith papers
-
Parton distributions in the shockwave formalism
A single shockwave Feynman-rule framework reproduces and extends prior small-x parton distributions, yielding new quark GTMD/GPD/PDF and diffractive-TMD results.
-
The one-point charge correlator in deep inelastic scattering
Defines an IRC-safe one-point charge correlator in DIS, relates it to a new nucleon charge correlator in the forward limit and to TMDs in the back-to-back limit, with SCET derivations verified in QCD to O(alpha_s^2) a...
-
Measurement of $\mathbf{q_T}$-weighted transverse-spin-dependent azimuthal asymmetries at COMPASS
COMPASS reports preliminary qT-weighted Drell-Yan transverse spin asymmetries from 2015 plus half of 2018 data, and extracts the first transverse moment of the pion Boer-Mulders TMD PDF.
-
Phenomenology of genuine twist-three distributions from a global QCD analysis
Global QCD analysis extracts genuine twist-three PDFs from g2, d2 and SIDIS asymmetries, confirming their universality and factorization validity.
-
Transverse force distributions in the proton from lattice QCD
Lattice QCD computes the transverse spatial distribution of the colour-Lorentz force on the struck quark in a proton, finding local forces up to about 3 GeV/fm, larger than the QCD string tension.
-
The effect of TMD evolution on the Sivers asymmetry in back-to-back $J/\psi+\gamma$ and $J/\psi+\text{jet}$ production at the Electron-Ion-Collider
After including TMD evolution, the Sivers asymmetry in these J/ψ processes at EIC kinematics remains sizable and largely independent of LDME choices, providing a robust probe of the gluon Sivers function.
-
Collins asymmetries for pion-in-jet production in polarized $\ell p$ collisions at the EIC
Collins asymmetries for pion-in-jet production in polarized lepton-proton collisions provide clearer access to transversity distributions at the EIC and test the universality of the Collins function.
-
Transversely polarized Drell-Yan measurements at COMPASS
COMPASS combines 2015 and partial 2018 Drell-Yan data to measure five transverse-spin azimuthal asymmetries, finding a Sivers asymmetry consistent with the QCD sign-change prediction at about one standard deviation.
-
Parton Distribution Functions and their Generalizations
A textbook-style introduction to the definitions, QCD properties, experimental access, and current phenomenological status of PDFs and their generalizations.
Discussion (0). Continue with ORCID to comment.