Extracting the Neutron Structure Function from Global DIS Data

Apr 11, 2019, 9:30 AM
Rettorato - Aula Magna

Rettorato - Aula Magna

Via Verdi, 8 Turin
Parallel Session Talk WG1: Structure Functions and Parton Densities WG1:Structure Functions and Parton Densities


Cynthia Keppel (Jefferson Lab)


The CJ (CTEQ-Jefferson Lab) collaboration provides a global fit of parton distribution functions with a special emphasis on the large $x$ region. The latest CJ15 global analysis implemented deuteron nuclear corrections at the parton level, and included data that were sensitive specifically to the neutron. These nuclear corrections allow for a calculation of the $F_2$ structure functions of the proton, deuteron, and neutron from PDFs. In this work we re-estimated the uncertainties in the DIS $F_2$ data utilized in CJ15, and collected an extended set of existing high-precision, small $Q^2$, large $x$ DIS data from JLab 6 GeV experiments. We employed the CJ15 calculation to remove nuclear effects from deuteron data where the proton was available from the same experiment, and thereby constructed a global data set for the $F_2$ neutron structure function. In this talk we will present the extracted $F_2$ neutron data sets, as well as select applications such as a new evaluation of the GSR sum rule, and a new neutron excess correction factor.

Primary authors

Alberto Accardi (Hampton U. and Jefferson Lab) Cynthia Keppel (Jefferson Lab)

Presentation materials