2018/12/18 by F. Bradamante, Bradamante, F. · 1 citation
Computer Science · Engineering · Physics and Astronomy · #Distributed and Parallel Computing Systems #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Superconducting Materials and Applications
paper · pdf · doi:10.48550/arxiv.1812.07281
openalex publication_date 2018/12/18 · openalex created_date 2020/05/21 · openalex updated_date 2026/07/28
Since 2005, measurements of Collins and Sivers asymmetries from the HERMES\nand COMPASS experiments have allowed to assess that the transversity and the\nSivers PDFs are different from zero and measurable in semi-inclusive DIS on\ntransversely polarised targets. Most of the data were collected on proton\ntargets, only small event samples were collected in the early phase of the\nCOMPASS experiment on a deuteron (6LiD) target and more recently at JLab, on\n3He, so that the d-quark and the sea-quarks PDFs are much more poorly\nknown than the u-quark PDFs. This constitutes an important limitation to the\nknowledge of the transverse spin structure of the nucleon. For this reason the\nCOMPASS Collaboration has proposed to measure semi-inclusive DIS on\ntransversely polarised deuterons with good accuracy, comparable with that of\nthe existing transverse spin asymmetry data on protons. The proposal has been\naccepted by CERN and the experiment will run in 2021, as soon as the Long\nShut-down 2 is over, providing measurements which will stay unique for many\nyears to come. Projections will be given for the extraction of the transversity\nPDFs, and for the evaluation of the isovector tensor charge of the nucleon.\n