Speaker
Description
Since the results the from European Muon Collaboration (EMC)
indicated that the combined quarks and anti-quarks account for only
about one-quarter of the proton spin, theories and experiments have
been trying to understand and measure the contributions from other
sources. Gluons have been of particular interest in the last couple of
decades. Spin asymmetry measurements from proton-proton collisions
sensitive to gluons are the prime channels to access this information.
After years of suggested models predicting a variety of gluon spin
contributions, RHIC results helped constrain the gluon helicity PDF
in the last decade. The proposed Spin Physics Detector (SPD) at
the NICA facility in JINR, Dubna will be an excellent laboratory to
probe various gluon spin distributions inside protons and deuterons.
In particular, double helicity asymmetry measurements at SPD will be
sensitive to the gluon helicity distributions and will make signi?cant
contributions to constrain the uncertainties in the large momentum
fraction (Bjorken $x$) region ($0.3 \leq x \leq 0.5$).
