Physics Letters B
The target and double spin asymmetries of the exclusive pseudoscalar channel e→p→→epπ0 were measured for the first time in the deep-inelastic regime using a longitudinally polarized 5.9 GeV electron beam and a longitudinally polarized proton target at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS). The data were collected over a large kinematic phase space and divided into 110 four-dimensional bins of Q2, xB, −t and ϕ. Large values of asymmetry moments clearly indicate a substantial contribution to the polarized structure functions from transverse virtual photon amplitudes. The interpretation of experimental data in terms of generalized parton distributions (GPDs) provides the first insight on the chiral-odd GPDs HT and ET, and complement previous measurements of unpolarized structure functions sensitive to the GPDs HT and ET. These data provide a crucial input for parametrizations of essentially unknown chiral-odd GPDs and will strongly influence existing theoretical calculations based on the handbag formalism. © 2017 The Author(s)
Original Publication Citation
Kim, A., Avakian, H., Burkert, V., Joo, K., Kim, W., Adhikari, K. P., . . . Zhang, J. (2017). Target and double spin asymmetries of deeply virtual π0 production with a longitudinally polarized proton target and CLAS. Physics Letters B, 768, 168-173. doi:10.1016/j.physletb.2017.02.032
Kim, A.; Avakian, H.; Burkert, V.; Joo, K.; Kim, W.; Adhikari, K. P.; Akbar, Z.; Pereira, S. Anefalos; Badui, R. A.; Battaglieri, M.; Bültmann, S.; Klein, A.; Kuhn, S E.; Prok, Y.; Torayev, B.; Weinstein, L. B.; and Zhang, J., "Target and Double Spin Asymmetries of Deeply Virtual π0 Production With a Longitudinally Polarized Proton Target and CLAS" (2017). Physics Faculty Publications. 65.