학술논문
Beam Asymmetry $\mathbf{\Sigma}$ for the Photoproduction of $\mathbf{\eta}$ and $\mathbf{\eta^{\prime}}$ Mesons at $\mathbf{E_{\gamma}=8.8}$GeV
Document Type
Working Paper
Author
The GlueX Collaboration; Adhikari, S.; Ali, A.; Amaryan, M.; Austregesilo, A.; Barbosa, F.; Barlow, J.; Barnes, A.; Barriga, E.; Barsotti, R.; Beattie, T. D.; Berdnikov, V. V.; Black, T.; Boeglin, W.; Boer, M.; Briscoe, W. J.; Britton, T.; Brooks, W. K.; Cannon, B. E.; Cao, N.; Chudakov, E.; Cole, S.; Cortes, O.; Crede, V.; Dalton, M. M.; Daniels, T.; Deur, A.; Dobbs, S.; Dolgolenko, A.; Dotel, R.; Dugger, M.; Dzhygadlo, R.; Egiyan, H.; Erbora, T.; Ernst, A.; Eugenio, P.; Fanelli, C.; Fegan, S.; Foda, A. M.; Foote, J.; Frye, J.; Furletov, S.; Gan, L.; Gasparian, A.; Gevorgyan, N.; Gleason, C.; Goetzen, K.; Goncalves, A.; Goryachev, V. S.; Guo, L.; Hakobyan, H.; Hamdi, A.; Huber, G. M.; Hurley, A.; Ireland, D. G.; Ito, M. M.; Jarvis, N. S.; Jones, R. T.; Kakoyan, V.; Kalicy, G.; Kamel, M.; Kourkoumelis, C.; Kuleshov, S.; Larin, I.; Lawrence, D.; Lersch, D. I.; Li, H.; Li, W.; Liu, B.; Livingston, K.; Lolos, G. J.; Lyubovitskij, V.; Mack, D.; Marukyan, H.; Mattione, P.; Matveev, V.; McCaughan, M.; McCracken, M.; McGinley, W.; Meyer, C. A.; Miskimen, R.; Mitchell, R. E.; Nerling, F.; Ng, L.; Ostrovidov, A. I.; Papandreou, Z.; Patsyuk, M.; Paudel, C.; Pauli, P.; Pedroni, R.; Pentchev, L.; Peters, K. J.; Phelps, W.; Pooser, E.; Qin, N.; Reinhold, J.; Ritchie, B. G.; Robison, L.; Romanov, D.; Romero, C.; Salgado, C.; Schertz, A. M.; Schumacher, R. A.; Schwiening, J.; Semenov, A. Yu.; Semenova, I. A.; Seth, K. K.; Shen, X.; Shepherd, M. R.; Smith, E. S.; Sober, D. I.; Somov, A.; Somov, S.; Soto, O.; Staib, M.; Stevens, J. R.; Strakovsky, I. I.; Suresh, K.; Tarasov, V. V.; Taylor, S.; Teymurazyan, A.; Thiel, A.; Vasileiadis, G.; Whitlatch, T.; Wickramaarachchi, N.; Williams, M.; Xiao, T.; Yang, Y.; Zarling, J.; Zhang, Z.; Zhao, G.; Zhou, Q.; Zhou, X.; Zihlmann, B.
Source
Phys. Rev. C 100, 052201 (2019)
Subject
Language
Abstract
We report on the measurement of the beam asymmetry $\Sigma$ for the reactions $\vec{\gamma}p\rightarrow p\eta$ and $\vec{\gamma}p \rightarrow p\eta^{\prime}$ from the GlueX experiment, using an 8.2--8.8 GeV linearly polarized tagged photon beam incident on a liquid hydrogen target in Hall D at Jefferson Lab. These measurements are made as a function of momentum transfer $-t$, with significantly higher statistical precision than our earlier $\eta$ measurements, and are the first measurements of $\eta^{\prime}$ in this energy range. We compare the results to theoretical predictions based on $t$--channel quasi-particle exchange. We also compare the ratio of $\Sigma_{\eta}$ to $\Sigma_{\eta^{\prime}}$ to these models, as this ratio is predicted to be sensitive to the amount of $s\bar{s}$ exchange in the production. We find that photoproduction of both $\eta$ and $\eta^{\prime}$ is dominated by natural parity exchange with little dependence on $-t$.
Comment: 18 pages, 7 figures
Comment: 18 pages, 7 figures