Target and Double Spin Asymmetries of Deeply Virtual π⁰ Production With a Longitudinally Polarized Proton Target and CLAS

Authors

A. Kim
H. Avakian
V. Burkert
K. Joo
W. Kim
K. P. Adhikari
Z. Akbar
S. Anefalos Pereira
R. A. Badui
M. Battaglieri
S. Bültmann, Old Dominion UniversityFollow
A. Klein, Old Dominion University
S E. Kuhn, Old Dominion UniversityFollow
Y. Prok, Old Dominion UniversityFollow
B. Torayev, Old Dominion University
L. B. Weinstein, Old Dominion UniversityFollow
J. Zhang, Old Dominion University

Document Type

Article

Publication Date

5-2017

DOI

10.1016/j.physletb.2017.02.032

Publication Title

Physics Letters B

Volume

768

Pages

168-173

Abstract

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 Q^2, x_B, −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 H_T and E_T, and complement previous measurements of unpolarized structure functions sensitive to the GPDs H_T and E_T. 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)

Comments

This is an open access article under the CC BY license.

(http://creativecommons.org/licenses/by/4.0/)

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

ORCID

0000-0003-2243-6836 (Kuhn)

Repository Citation

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.
https://digitalcommons.odu.edu/physics_fac_pubs/65