arXiv subjects

D. W. Upton

Publications and source records attributed to D. W. Upton.

2 recordsLinked to original sources

arXiv2026

Extraction of $σ_{TT}$ for Proton, Neutron, Deuteron and $^3$He from Quasi-real Photon Scattering

We report on an extraction of the polarized photoproduction cross-section for the proton, deuteron, neutron and $^3$He, obtained by extrapolating electron scattering data to the real photon point. The data are from the Jefferson Lab E97-110 ($^3$He) and CLAS EG4 (proton and deuteron) experiments. Information on the neutron is extracted from the deuteron or $^3$He data using the weak binding approximation. Comparing with data obtained with real photons, we find that while the proton results agree, our results on the deuteron and the neutron exhibit a larger strength in the $Δ(1232)$ region, and are more consistent with isospin symmetry when compared with the proton results.

hep-ex↗

arXiv2024

High precision measurements of alpha_s at the future EIC

We present a projection study for the first moments of the inclusive spin structure function for the proton and neutron from simulated doubly-polarized e+p and e+3He collision data expected from the Electron-Ion collider. For detection and extraction of the neutron spin asymmetries from e+3He collisions, we used the double-tagging method which significantly reduces the uncertainty over the traditional inclusive method. Using the Bjorken sum rule, the projected results allow us to determine that the QCD coupling at the Z-pole alpha_s can be measured with a relative precision of 1.3%. This underscores the significance of the EIC for achieving precision determinations of alpha_s.

nucl-th↗