Probing Quark-Gluon Interactions with Transverse Polarized Scattering
K. Slifer, O.A. Rondon, A. Aghalaryan, A. Ahmidouch, R. Asaturyan, F., Bloch, W. Boeglin, P. Bosted, C. Carasco, R. Carlini, J. Cha, J.P. Chen, M.E., Christy, L. Cole, L. Coman, D. Crabb, S. Danagoulian, D. Day, J. Dunne, M., Elaasar, R. Ent, H. Fenker, E. Frlez, D. Gaskell
TL;DR
This paper investigates quark-gluon interactions through polarized electron scattering, extracting QCD matrix elements that reveal non-zero higher twist effects and confirming fundamental sum rules at low momentum transfer.
Contribution
It provides the first clear extraction of the higher twist matrix element {d}_2 from polarized scattering data, highlighting quark-gluon interactions and isospin dependence.
Findings
{d}_2 is unambiguously non-zero.
Isospin dependence observed in higher twist effects.
Bjorken sum rule is satisfied at low momentum transfer.
Abstract
We have extracted QCD matrix elements from our data on double polarized inelastic scattering of electrons on nuclei. We find the higher twist matrix element \tilde{d_2}, which arises strictly from quark- gluon interactions, to be unambiguously non zero. The data also reveal an isospin dependence of higher twist effects if we assume that the Burkhardt-Cottingham Sum rule is valid. The fundamental Bjorken sum rule obtained from the a0 matrix element is satisfied at our low momentum transfer.
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