Updating a QCD Global Analysis of Single Transverse-Spin Asymmetries with Additional Constraints from Experimental Data and Lattice QCD
ORAL
Abstract
By developing a computational framework to analyze high-energy transverse single-spin asymmetry data, we have been able to study the 3D structure of hadrons through the extraction of transverse momentum dependent parton distribution functions and fragmentation functions (TMDs). Different observables, such as semi-inclusive lepton-nucleon deep inelastic scattering, electron-positron annihilation, and proton-proton collisions, provide insight to interactions that occur within hadrons. With the publication of new data from HERMES and STAR providing further constraints on the TMDs in our model, we are interested in comparing our previous analysis to a new global fit. We also incorporated lattice data on the nucleon tensor charge to provide additional constraints on the transversity function and introduced a framework to analyze proton-proton hadron-in-jet Collins asymmetry data. The new data from STAR and HERMES introduces sensitivity to a novel quark-gluon-quark fragmentation function. With this new global fit, we are able to assess data compatibility, as well as gain a better understanding of the 3D structure of hadrons.
*This work is supported by the National Science Foundation under Grants No. PHY-2011763 (MM, JM, DP) 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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Michel J Malda
- Lebanon Valley College