Beam spin asymmetry measurements from deeply virtual meson production

Authors

Bo Zhao, University of Connecticut

Date of Completion

January 2008

Keywords

Physics, Nuclear

Degree

Ph.D.

Abstract

Deeply virtual exclusive reactions γ* +N → N+M (M = γ, meson), where the γ* virtuality Q² is large, offer a unique opportunity to probe the nucleon structure at the parton level, as described by Generalized Parton Distributions (GPDs). The object of this study is to measure the Beam Spin Asymmetry (BSA) in Deeply Virtual Meson Production (DVMP), in the pseudoscalar channels ep → epη and ep → epπ ⁰. The data came from the 2005 CLAS experiment of e1-dvcs, with a 5.776 GeV electron beam impinging on a liquid Hydrogen target. In this study, the Q², x_bj and t dependencies of the η and π⁰ BSAs in deep inelastic regime are measured and compared. For both of these channels, the measurements of non-zero BSA are the indicative of longitudinal-transverse (LT') interference, which is not in agreement with the prediction of the QCD factorization theorems. ^

Recommended Citation

Zhao, Bo, "Beam spin asymmetry measurements from deeply virtual meson production" (2008). Doctoral Dissertations. AAI3345217.
https://digitalcommons.lib.uconn.edu/dissertations/AAI3345217