[Hybrid baryons] Review Request: Slides for DNP

Izzy Illari izzy at jlab.org
Mon Sep 30 10:54:54 EDT 2024


Dear RG-K Group and Hadron Spectroscopy Working Group Members,

I'm preparing for my upcoming DNP talk and would like to circulate my 
slides for review. These are largely identical to those presented at the 
PWA/ATHOS conference, as my recent work on detector acceptances using 
simulations&GEMC isn't yet ready for external presentation.

I welcome any new comments or suggestions. For reference, I've included 
my final DNP abstract below, the result of previous comments and 
suggestions. Please let me know if there are any issues accessing the 
slides attached to this message.

Thank you for your time and feedback.

Best regards,
Izzy

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 ηN final states, 
accessible only via isospin I = 1/2 resonances, provide a complimentary 
tool to the more extensively studied πN system for the extraction of 
resonance properties. This work presents the first-ever measurement of 
the beam spin asymmetry (ALU) in exclusive η electroproduction, covering 
a previously unexplored kinematic region with 1.6 ≤ W ≤ 2.2 GeV. ALU is 
determined from the CLAS12 data using an analysis framework that 
considers the statistical limitations of the data set. Results are 
compared to theoretical models Jülich-Bonn-Washington and EtaMAID. ALU 
exhibits discrepancies with model predictions, highlighting the 
potential for refining theoretical descriptions of nucleon resonances 
and their electromagnetic couplings. These new results in a previously 
unmeasured kinematic region provide valuable input for future 
theoretical developments.

*This work was supported by the US Department of Energy Office of 
Science, Office of Nuclear Physics, under contract no. DE-SC0016583.
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