Difference between revisions of "Measurement of the beam asymmetry Σ for π^0 and η photoproduction on the proton at E sub γ=9 GeV"
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{{DISPLAYTITLE:Measurement of the beam asymmetry Σ for π<span style="position:absolute; top: -9999px">^</span ><sup>0</sup> and η photoproduction on the proton at E<span style="position:absolute; top: -9999px"> sub </span ><sub>γ</sub>=9 GeV}} | {{DISPLAYTITLE:Measurement of the beam asymmetry Σ for π<span style="position:absolute; top: -9999px">^</span ><sup>0</sup> and η photoproduction on the proton at E<span style="position:absolute; top: -9999px"> sub </span ><sub>γ</sub>=9 GeV}} | ||
== Publication Information == | == Publication Information == | ||
| − | * H. Al Ghoul et al. [GlueX Collaboration], Phys. Rev. C95, 042201 (2107), [https://doi.org/10.1103/PhysRevC.95.042201 DOI:10.1103/PhysRevC.95.042201] | + | * H. Al Ghoul et al. [GlueX Collaboration], Phys. Rev. C95, 042201 (2107), [https://doi.org/10.1103/PhysRevC.95.042201 DOI:10.1103/PhysRevC.95.042201]. |
* [https://arxiv.org/abs/1701.08123 arXiv:1701.08123] [nucl-ex] (2017). | * [https://arxiv.org/abs/1701.08123 arXiv:1701.08123] [nucl-ex] (2017). | ||
| + | * [https://www.hepdata.net/record/76745 HEPData]. | ||
== Abstract == | == Abstract == | ||
Revision as of 10:15, 21 March 2019
Publication Information
- H. Al Ghoul et al. [GlueX Collaboration], Phys. Rev. C95, 042201 (2107), DOI:10.1103/PhysRevC.95.042201.
- arXiv:1701.08123 [nucl-ex] (2017).
- HEPData.
Abstract
We report measurements of the photon beam asymmetry Σ for the reactions γ⃗p→π0p and γ⃗p→ηp 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 π0 measurements, and are the first η 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.
Figures and captions
| Caption | Figures |
|---|---|
| (a) Photon beam intensity versus energy as measured by the pair spectrometer (not corrected for instrumental acceptance). (b) Photon beam polarization as a function of beam energy, as measured by the triplet polarimeter, with data points offset horizontally by ±0.015 GeV for clarity. | [1] |
