New JAM Global Analysis of Spin-Dependent PDFs
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
We present the results of a new global next-to-leading order analysis of spin-dependent parton distribution functions from the most recent world data on polarized deep-inelastic scattering (DIS) and pp collisions, focusing in particular on the large-x and low-Q2 regions. By directly fitting DIS polarization asymmetries, we eliminate biases introduced by using polarized structure function data extracted under nonuniform assumptions for the unpolarized structure functions. For analysis of the large-x data, we implement nuclear smearing corrections for deuterium and 3He nuclei, and systematically include target mass and higher twist corrections to the g1 and g2 structure functions at low Q2. We also explore the effects of Q2 and W2 cuts in the data sets, and the potential impact of future data on the behavior of the spin-dependent parton distributions at intermediate and large x.
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1963388
- Report Number(s):
- JLAB-THY-14-2024; DOE/OR/23177-5856
- Country of Publication:
- United States
- Language:
- English
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