Conveners
Nucleon Structure: Nucleon Structure
- Eugene Pasyuk (Jefferson Lab)
Several experiments are planned at Jefferson Lab and other facilities which will utilize a solid polarized target to investigate tensor structure functions. This new program will help clarify how the properties of the nucleus arise from the underlying partons, and provide novel information about gluon contributions, quark angular momentum, and the polarization of the quark sea that is not...
The pion’s makeup of quarks, antiquarks, and gluons (or partons) can be described in terms of
its parton distribution functions (PDFs). These are functions of the partons’ momentum
fraction, $x$, relative to the pion. Recently, we were able to determine the pion’s PDF at high- and
low-$x$ regions using Drell-Yan (DY) and Leading Neutron (LN) data. In the DY process, two
hadrons collide, one...
We find that a parton-level hard cross section also generates a phase at two loops in semi-inclusive deeply inelastic scattering (SIDIS) off a polarized nucleon, which represents a new source of transverse single-spin asymmetry different from those in the Sivers function and the Collins function. As an extension of the above analysis, we complete the sources of transverse single spin asymmetry...
To separate the proton structure functions into calculable processes and parton distribution functions (PDFs), there are various schemes such as the Fixed-Flavor Number (FFN) and the General Mass Variable-Flavor Number (GM-VFN) schemes. In this Next-to-Leading Order (NLO) Quantum Chromo Dynamics (QCD) analysis we determine PDFs based on the four different HERA I and II combined, H1-ZEUS...
