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Measurement of the beam asymmetry Σ for π0 and η photoproduction on the proton at Eγ=9 GeV

Physical review. C2017Vol. 95(4)

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H. Al Ghoul, E.G. Anassontzis, A. Austregesilo, Fernando Barbosa, A. V. Barnes, T. D. Beattie, D. W. Bennett, В. В. Бердников, T. Black, W. Boeglin, W. J. Briscoe, W. K. Brooks, B. E. Cannon, Oleksandr Chernyshov, E. Chudakov, V. Credé, M. M. Dalton, A. Deur, S. Dobbs, A. Dolgolenko, M. Dugger, R. Dzhygadlo, H. Egiyan, P. Eugenio, C. Fanelli, A. M. Foda, J. Frye, S. Furletov, L. Gan, A. Gasparian, А. С. Герасимов, N. Gevorgyan, K. Goetzen, V. Goryachev, L. Guo, H. Hakobyan, John Hardin, A. Henderson, G. M. Huber, D. G. Ireland, M. M. Ito, N. S. Jarvis, R. W. L. Jones, V. Kakoyan, M. Kamel, F. J. Klein, R. Kliemt, C. Kourkoumeli, S. Kuleshov, I.I. Kuznetsov, M. Lara, I. Larin, David Lawrence, W. I. Levine, K. Livingston, G. J. Lolos, Valery E. Lyubovitskij, D. Mack, P. Mattione, V. Matveev, M. McCaughan, M. McCracken, W. McGinley, Justin I. McIntyre, R. A. Méndez, C. A. Meyer, R. Miskimen, R. E. Mitchell, F. Mokaya, K. Moriya, F. Nerling, G. Nigmatkulov, N. Ochoa, A. Ostrovidov, Z. Papandreou, M. Patsyuk, R. Pedroni, M. R. Pennington, L. Pentchev, Κ. Peters, E. Pooser, B. Pratt, Y. Qiang, J. Reinhold, B. G. Ritchie, Lee Robison, D. Romanov, C. Salgado, R. A. Schumacher, C. Schwarz, J. Schwiening, A. Yu. Semenov, I. A. Semenova, K. K. Seth, M. R. Shepherd, E. S. Smith, D. I. Sober, A. Somov, S. Somov, Orlando Javier Soto Sandoval, N. A. Sparks, Michael Staib, J. R. Stevens, I. I. Strakovsky, A. Subedi, В. В. Тарасов, S. Taylor, A. Teymurazyan, I. Tolstukhin, A. Tomaradze, A. Toro, Aristeidis Tsaris, G. Vasileiadis, Inés de Vega, N. K. Walford, D. Werthmüller, T. Whitlatch, M. Williams, E. Wolin, Ting Xiao, J. Zarling, Zhenyu Zhang, B. Zihlmann, V. Mathieu, Jannes Nys

Abstract

We report measurements of the photon beam asymmetry $\mathrm{\ensuremath{\Sigma}}$ for the reactions $\stackrel{P\vec}{\ensuremath{\gamma}}p\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{0}$ and $\stackrel{P\vec}{\ensuremath{\gamma}}p\ensuremath{\rightarrow}p\ensuremath{\eta}$ 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 ${\ensuremath{\pi}}^{0}$ measurements and are the first $\ensuremath{\eta}$ measurements in this energy regime. The results are compared with theoretical predictions based on $t$-channel, quasiparticle exchange and constrain the axial-vector component of the neutral meson production mechanism in these models.

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Abstract

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