Update on the JAM Global Analysis of SSAs
ORAL
Abstract
The analysis of single transverse-spin asymmetries (SSAs) gives us tremendous insight into the internal structure of hadrons. For example, the Sivers and Collins effects in semi-inclusive deep-inelastic scattering (SIDIS), Sivers effect in Drell-Yan, and the Collins effect in electron-positron annihilation have been widely investigated over many years in order to perform 3D momentum-space tomography. In addition, observables like AN in proton-proton collisions are of interest due to their sensitivity to quark-gluon correlations. In this talk I will discuss results, and give an update on, our global fit of SSA data from SIDIS, Drell-Yan, e+eā annihilation into hadron pairs, and proton-proton collisions. This includes the impact of new HERMES and STAR data on our analysis as well as lattice data for the tensor charge. I will also mention future directions for the JAM global analysis of SSAs.
*This work is supported by the National Science Foundation under Grants No. PHY-2011763 (DP, MM, JM) and No. PHY-2012002 (AP). The work of NS is supported by the DOE, Office of Science, Office of Nuclear Physics in the Early Career Program.
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Publication: J. Cammarota, L. Gamberg, Z.B. Kang, J.A. Miller, D. Pitonyak, A. Prokudin, T.C. Rogers and N. Sato, "Origin of single transverse-spin asymmetries in high-energy collisions,'' Phys. Rev. D 102, 054002 (2020) [arXiv:2002.08384 [hep-ph]].
M. Malda, J.A. Miller, D. Pitonyak, A. Prokudin and N. Sato, "Updated QCD global analysis of single transverse-spin asymmetries," in preparation.
Presenters
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Daniel Pitonyak
- Lebanon Valley College