Multidimensional, High Precision Measurements of Beam Single Spin Asymmetries in Semi-inclusive π+ Electroproduction off Protons in the Valence Region

(CLAS Collaboration)

Research output: Contribution to journalArticlepeer-review

Abstract

High precision measurements of the polarized electron beam-spin asymmetry in semi-inclusive deep inelastic scattering (SIDIS) from the proton have been performed using a 10.6 GeV incident electron beam and the CLAS12 spectrometer at Jefferson Lab. We report here a high precision multidimensional study of single π+ SIDIS data over a large kinematic range in Bjorken x, fractional energy, and transverse momentum of the hadron as well as photon virtualities Q2 ranging from 1-7 GeV2. In particular, the structure function ratio FLUsinφ/FUU has been determined, where FLUsinφ is a twist-3 quantity that can reveal novel aspects of emergent hadron mass and quark-gluon correlations within the nucleon. The data's impact on the evolving understanding of the underlying reaction mechanisms and their kinematic variation is explored using theoretical models for the different contributing transverse momentum dependent parton distribution functions.

Original languageEnglish (US)
Article number062005
JournalPhysical Review Letters
Volume128
Issue number6
DOIs
StatePublished - Feb 11 2022

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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