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Al Ghoul, H. et al.
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Measurement of the beam asymmetry $\Sigma$ for $\pi^0$ and $\eta$ photoproduction on the proton at $E_\gamma = 9$ GeV

The GlueX collaboration

Al Ghoul, H. , Anassontzis, E.G. , Austregesilo, A. , Barbosa, F. , Barnes, A. , Beattie, T.D. , Bennett, D.W. , Berdnikov, V.V. , Black, T. , Boeglin, W.

2017.

https://doi.org/10.17182/hepdata.76745

http://inspirehep.net/literature/1511149 INSPIREhttp://inspirehep.net/literature/1511149

Abstract

We report measurements of the photon beam asymmetry $\Sigma$ for the reactions $\vec{\gamma}p\to p\pi^0$ and $\vec{\gamma}p\to p\eta $ from the GlueX experiment using a 9 GeV linearly polarized, tagged photon beam incident on a liquid hydrogen target in Jefferson Lab's Hall D. The asymmetries, measured as a function of the proton momentum transfer, possess greater precision than previous $\pi^0$ measurements and are the first $\eta$ measurements in this energy regime. The results are compared with theoretical predictions based on $t$-channel, quasi-particle exchange and constrain the axial-vector component of the neutral meson production mechanism in these models.

Table 1

Data from Fig 6a on page 6 of preprint.

10.17182/hepdata.76745.v1/t1

Measurement of the beam asymmetry $\Sigma$ for $\pi^0$ photoproduction on the proton at $E_\gamma = 9$ GeV. The uncorrelated systematic...
https://www.hepdata.net/record/data/70003yaml https://www.hepdata.net/record/data/70003/csvcsv
Table 2

Date from Fig 6b on page 6 of preprint.

10.17182/hepdata.76745.v1/t2

Measurement of the beam asymmetry $\Sigma$ for $\eta$ photoproduction on the proton at $E_\gamma = 9$ GeV. The uncorrelated systematic...
https://www.hepdata.net/record/data/70004yaml https://www.hepdata.net/record/data/70004/csvcsv

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