Speaker
Hoyoung Kang
(Seoul National University)
Description
In Hall C at the Thomas Jefferson National Laboratory, the Spin Asymmetries of the Nucleon Experiment (SANE, E07-003) measured the spin asymmetries of the proton, using a polarized electron beam and a polarized ammonia target. By rotation of superconducting magnet about the target, parallel and near-perpendicular double spin asymmetries were measured at beam energies of $4.7$ and $5.9 GeV$. The spin structure functions $g_1$ and $g_2$ can be extracted from these asymmetries. The primary experiment used the Big Electron Telescope Array (BETA) which covered a large solid angle ( ~200msr) to detect electrons scattered to the beam left at 40 degrees. Simultaneously, the High Momentum Spectrometer (HMS) detected electrons scattered to beam right. Although BETA covers larger kinematic region, the HMS, by varying the central angle and momentum , collected complementary data at four-momentum transfer $Q^2$ of $0.8$, $1.3$, and $1.9 GeV^2$, from the resonance region to the region of invariant mass $W = 2.3 GeV$. These regions are the extended range of previous RSS experiment, allowing better determination of the integral of $g_2$ and the $Q^2$ dependency of $A_1$ and $A_2$ at resonance region. In this talk, the current progress of the analysis and preliminary spin
asymmetries from HMS data will be presented.
Author
Hoyoung Kang
(Seoul National University)
