Measurement of beam asymmetry for π − Δ + + photoproduction on the proton at E γ = 8.5 GeV
Name
PhysRevC.103.L022201.pdf
Description
Published version
Size
785.06 KB
Format
Adobe PDF
Checksum (MD5)
e492ce07e2efcea7a4c5e7014ca11138
Author(s)
Williams, Michael
Date Issued
2021
Journal
Physical Review C
Publisher
American Physical Society (APS)
Citation
Williams, Michael. 2021. "Measurement of beam asymmetry for π − Δ + + photoproduction on the proton at E γ = 8.5 GeV." Physical Review C, 103 (2).
Version
Final published version
Abstract
We report a measurement of the π- photoproduction beam asymmetry for the reaction γp→π-Δ++ using data from the GlueX experiment in the photon beam energy range 8.2-8.8 GeV. The asymmetry ς is measured as a function of four-momentum transfer t to the Δ++ and compared to phenomenological models. We find that ς varies as a function of t: negative at smaller values and positive at higher values of |t|. The reaction can be described theoretically by t-channel particle exchange requiring pseudoscalar, vector, and tensor intermediaries. In particular, this reaction requires charge exchange, allowing us to probe pion exchange and the significance of higher-order corrections to one-pion exchange at low momentum transfer. Constraining production mechanisms of conventional mesons may aid in the search for and study of unconventional mesons. This is the first measurement of the process at this energy.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PHYSREVC.103.L022201
