Study of the worm-gear-T function <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>g</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mi>T</mml:mi></mml:mrow></mml:msub></mml:math> with semi-inclusive DIS data
Malin Elisabeth Horstmann, Andreas Schäfer, Alexey Vladimirov
Abstract
The worm-gear-T function parametrizes the probability of finding a longitudinally polarized quark inside a transversely polarized hadron. We extract it from data on polarized semi-inclusive deep-inelastic scattering measured at COMPASS and HERMES. As a theoretical model, we use a Wandzura-Wilczek-type approximation at next-to-leading order. We find that at present, the data quality is insufficient to determine the worm-gear-T function faithfully. We also provide predictions for the transverse single-spin asymmetry associated with the worm-gear-T function, which could be measured in weak-boson production at STAR.
Topics & Concepts
Deep inelastic scatteringParticle physicsPhysicsHadronFunction (biology)QuarkMuonScatteringAlgorithmComputer scienceQuantum mechanicsInelastic scatteringBiologyEvolutionary biologyParticle physics theoretical and experimental studiesQuantum Chromodynamics and Particle InteractionsHigh-Energy Particle Collisions Research