Measurement of the photon beam asymmetry in γ ⃗ p → K + Σ 0 at E γ = 8.5 GeV
Name
PhysRevC.101.065206.pdf
Description
Published version
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Checksum (MD5)
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Author(s)
GlueX Collaboration
Fanelli, Cristiano
Patsyuk, Maria
Williams, Michael
Yang, Y.
Date Issued
May 2020
Journal
Physical Review C
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
© 2020 American Physical Society. We report measurements of the photon beam asymmetry ς for the reaction γ - p→K+ς0(1193) using the GlueX spectrometer in Hall D at Jefferson Lab. Data were collected by using a linearly polarized photon beam in the energy range of 8.2-8.8 GeV incident on a liquid hydrogen target. The beam asymmetry ς was measured as a function of the Mandelstam variable t, and a single value of ς was extracted for events produced in the u channel. These are the first exclusive measurements of the photon beam asymmetry ς for the reaction in this energy range. For the t channel, the measured beam asymmetry is close to unity over the t range studied, -t=(0.1-1.4)(GeV/c)2, with an average value of ς=1.00±0.05. This agrees with theoretical models that describe the reaction via the natural-parity exchange of the K∗(892) Regge trajectory. A value of ς=0.41±0.09 is obtained for the u channel integrated up to -u=2.0 (GeV/c)2.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
10.1103/PHYSREVC.101.065206
