Beam spin asymmetry observables from electroproduction of $p\pi^{+}\pi^{-}$ off protons
ORAL
Abstract
One of the goals of the N* program at JLab is to understand the evolution of the dominant degrees of freedom of QCD at varying length scales ($Q^{2}$). A method of probing this evolution is by studying how the electrocouplings - couplings of a virtual photon to the nucleon excited nucleon vertex ($\gamma_{v}NN^{*}$) - change with $Q^{2}$. In my presentation, I will provide an update on the first attempt to obtain beam spin asymmetry observables from the reaction $\gamma_{v}p \rightarrow p\pi^{+}\pi^{-}$ in the Q$^{2}$ range of 2 GeV$^{2}$ $<$ Q$^{2}$ $<$ 5 GeV$^{2}$ and W in the range of 1.3 GeV $<$ W $<$ 3 GeV. These observables will be used to extract the electrocouplings for the $Q^{2}$ and W range of this analysis. The update will be preceded by a short introduction to the electrocouplings motivated observables and followed by a summary outlining the steps remaining before my analysis is complete.
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Authors
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Arjun Trivedi
University of South Carolina
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Ralf W. Gothe
University of South Carolina
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Gleb Fedotov
University of South Carolina
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Evan Phelps
University of South Carolina
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Ye Tian
University of South Carolina