[clas12_rgk] [EXTERNAL] Abstract for DNP

[Izzy Illari]

Dear RG-K Group and HSWG Members,

I hope this email finds you well.

I have been encouraged by RG-K group to submit an abstract for the upcoming
DNP October 7-10. The abstract is identical to the one I presented at the
PWA/ATHOS conference in May, which has already been previously circulated
to the HSWG.

For your convenience, I have copied the abstract again down below. The
abstract submission deadline is 8 July 2024.

I would appreciate any feedback or suggestions you may have regarding the
abstract.

Thank you and all the best,
Izzy

Exclusive $\eta$ Electro-Production Beam Spin Asymmetry Measurements using
CLAS12 at Jefferson Lab

The exploration of nucleon structure and electromagnetic transitions from
ground state to excited state is a cornerstone of nuclear physics research.
Meson electro-production experiments have opened new avenues for
investigating these phenomena, particularly in the 12 GeV era at Jefferson
Lab with the CLAS12 spectrometer. The $\eta N$ final states, accessible
only through isospin $I = 1/2$ resonances, provide a unique tool for
studying nucleon excitations. By simplifying the analysis and enabling a
cleaner extraction of resonance properties compared to the extensively
studied $\pi N$ final states, $\eta$ electro-production offers a
complementary approach to unraveling the structure of excited nucleons.
This work presents the first-ever measurement of the beam spin asymmetry
(BSA) in exclusive $\eta$ electro-production, covering a previously
unexplored kinematic region with $1.6 \leq W \leq 2.2$ GeV. The BSA is
extracted from the CLAS12 data using a comprehensive analysis framework
that carefully considers the statistical limitations of the data set. The
results are compared to predictions from theoretical models, such as the
J"{u}lich-Bonn-Washington (JBW) and MAID, as well as compared to previously
published cross-section and spin observable results from CLAS, and SLAC.
Notably, the extracted BSA exhibits discrepancies with the model
predictions, highlighting the potential for refining theoretical
descriptions of nucleon resonances and their electromagnetic couplings
through the incorporation of these new data. The high-precision data
obtained in this previously unmeasured kinematic region now serve as
valuable input for theorists to refine their models.

-- 
Izzy Illari
Pronouns: They/Them

M.Phil. in Physics | The George Washington University, 2022
Graduate Certificate in Data Science | The George Washington University,
2021
M.S. in Physics | The George Washington University, 2020
B.A. in Physics | Barnard College, Columbia University, 2017

GWU: iti2103 at gwmail.gwu.edu | JLab: izzy at jlab.org
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