Speaker
Prof.
Franco Bradamante
(INFN, Trieste Section)
Description
Since 2005, measurements of Collins and Sivers asymmetries from the HERMES
and COMPASS experiments have allowed to assess that the transversity and the
Sivers PDF are different from zero and measurable in semi-inclusive DIS on
transversely polarized targets. Most of the data were collected on proton
targets, only few data were collected in the early phase of the COMPASS
experiment on a deuteron (6LiD) target and more recently at JLab, on 3He, so that
the d-quark and the sea-quarks PDFs are much more poorly known than the u-quark PDFs.
This constitutes an important limitation to the knowledge of the transverse spin
structure of the nucleon.
For this reason the COMPASS Collaboration has proposed to measure semi-inclusive DIS
on transversely polarized deuterons with good accuracy, comparable with that of the
existing transverse spin asymmetry data on protons. The proposal has been accepted
by CERN and the experiment will run in 2021, as soon as the Long Shut-down 2 is over,
providing measurements which will stay unique for many years to come.
Projections will be given for the extraction of the transversity PDFs, and for
the evaluation of the vector tensor charge of the nucleon.
Primary author
Prof.
Franco Bradamante
(INFN, Trieste Section)
