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# 8th Workshop of the APS Topical Group on Hadronic Physics

10-12 April 2019
Denver, CO
US/Mountain timezone

12 Apr 2019, 11:20
20m
Director's Row I (Denver, CO)

### Director's Row I

#### Denver, CO

Sheraton Denver Downtown Hotel, 1550 Court Pl. lobby level of the Plaza building
contributed talk

### Speaker

Prof. Garth Huber (University of Regina)

### Description

Exclusive meson electroproduction at different squared four-momenta of the exchanged virtual photon, Q^2, and at different four-momentum transfers, t and u, can be used to probe QCD's transition from hadronic degrees of freedom at long distance scale to quark-gluon degrees of freedom at short distance scale. Backward-angle meson electroproduction was previously ignored, but is anticipated to offer complimentary information to conventional forward-angle meson electroproduction studies on nucleon structure. The results of our pioneering study of backward-angle omega cross sections through the exclusive p(e,e'p)omega reaction will be presented. The experiment was performed as part of E01-004 in Jefferson Lab Hall C, with central $Q^2$ values of 1.60 and 2.45 GeV^2, and W=2.21 GeV. The extracted cross sections were separated into transverse (T), longitudinal (L), and LT, TT interference terms. The data set has a unique coverage of u~0, opening up a new means to study the transition of the nucleon wave function through backward-angle experimental observables. Plans to extend these studies to the pi^0 channel will also be presented.

### Primary author

Prof. Garth Huber (University of Regina)

### Co-author

Dr Wenliang (Bill) Li (College of William and Mary)

 Slides