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

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.
Briscoe, W.J.
Brooks, W.K.
Cannon, B.E.
Chernyshov, O.
Chudakov, E.
Crede, V.
Dalton, M.M.
Deur, A.
Dobbs, S.
Dolgolenko, A.
Dugger, M.
Dzhygadlo, R.
Egiyan, H.
Eugenio, P.
Fanelli, C.
Foda, A.M.
Frye, J.
Furletov, S.
Gan, L.
Gasparian, A.
Gerasimov, A.
Gevorgyan, N.
Goetzen, K.
Goryachev, V.S.
Guo, L.
Hakobyan, H.
Hardin, J.
Henderson, A.
Huber, G.M.
Ireland, D.G.
Ito, M.M.
Jarvis, N.S.
Jones, R.T.
Kakoyan, V.
Kamel, M.
Klein, F.J.
Kliemt, R.
Kourkoumeli, C.
Kuleshov, S.
Kuznetsov, I.
Lara, M.
Larin, I.
Lawrence, D.
Levine, W.I.
Livingston, K.
Lolos, G.J.
Lyubovitskij, V.
Mack, D.
Mattione, P.T.
Matveev, V.
McCaughan, M.
McCracken, M.
McGinley, W.
McIntyre, J.
Mendez, R.
Meyer, C.A.
Miskimen, R.
Mitchell, R.E.
Mokaya, F.
Moriya, K.
Nerling, F.
Nigmatkulov, G.
Ochoa, N.
Ostrovidov, A.I.
Papandreou, Z.
Patsyuk, M.
Pedroni, R.
Pennington, M.R.
Pentchev, L.
Peters, K.J.
Pooser, E.
Pratt, B.
Qiang, Y.
Reinhold, J.
Ritchie, B.G.
Robison, L.
Romanov, D.
Salgado, C.
Schumacher, R.A.
Schwarz, C.
Schwiening, J.
Semenov, A.Y.
Semenova, I.A.
Seth, K.K.
Shepherd, M.R.
Smith, E.S.
Sober, D.I.
Somov, A.
Somov, S.
Soto, O.
Sparks, N.
Staib, M.J.
Stevens, J.R.
Strakovsky, I.I.
Subedi, A.
Tarasov, V.
Taylor, S.
Teymurazyan, A.
Tolstukhin, I.
Tomaradze, A.
Toro, A.
Tsaris, A.
Vasileiadis, G.
Vega, I.
Walford, N.K.
Werthmüller, D.
Whitlatch, T.
Williams, M.
Wolin, E.
Xiao, T.
Zarling, J.
Zhang, Z.
Zihlmann, B.
Mathieu, V.
Nys, J.
GlueX Collaboration

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

Authors: H. Al Ghoul Anassontzis, E.G. Austregesilo, A. Barbosa, F. Barnes, A. Beattie, T.D. Bennett, D.W. Berdnikov, V.V. Black, T. Boeglin, W. Briscoe, W.J. Brooks, W.K. Cannon, B.E. Chernyshov, O. Chudakov, E. Crede, V. Dalton, M.M. Deur, A. Dobbs, S. Dolgolenko, A. Dugger, M. Dzhygadlo, R. Egiyan, H. Eugenio, P. Fanelli, C. Foda, A.M. Frye, J. Furletov, S. Gan, L. Gasparian, A. Gerasimov, A. Gevorgyan, N. Goetzen, K. Goryachev, V.S. Guo, L. Hakobyan, H. Hardin, J. Henderson, A. Huber, G.M. Ireland, D.G. Ito, M.M. Jarvis, N.S. Jones, R.T. Kakoyan, V. Kamel, M. Klein, F.J. Kliemt, R. Kourkoumeli, C. Kuleshov, S. Kuznetsov, I. Lara, M. Larin, I. Lawrence, D. Levine, W.I. Livingston, K. Lolos, G.J. Lyubovitskij, V. Mack, D. Mattione, P.T. Matveev, V. McCaughan, M. McCracken, M. McGinley, W. McIntyre, J. Mendez, R. Meyer, C.A. Miskimen, R. Mitchell, R.E. Mokaya, F. Moriya, K. Nerling, F. Nigmatkulov, G. Ochoa, N. Ostrovidov, A.I. Papandreou, Z. Patsyuk, M. Pedroni, R. Pennington, M.R. Pentchev, L. Peters, K.J. Pooser, E. Pratt, B. Qiang, Y. Reinhold, J. Ritchie, B.G. Robison, L. Romanov, D. Salgado, C. Schumacher, R.A. Schwarz, C. Schwiening, J. Semenov, A.Y. Semenova, I.A. Seth, K.K. Shepherd, M.R. Smith, E.S. Sober, D.I. Somov, A. Somov, S. Soto, O. Sparks, N. Staib, M.J. Stevens, J.R. Strakovsky, I.I. Subedi, A. Tarasov, V. Taylor, S. Teymurazyan, A. Tolstukhin, I. Tomaradze, A. Toro, A. Tsaris, A. Vasileiadis, G. Vega, I. Walford, N.K. Werthmüller, D. Whitlatch, T. Williams, M. Wolin, E. Xiao, T. Zarling, J. Zhang, Z. Zihlmann, B. Mathieu, V. Nys, J. GlueX Collaboration
Publication date: 1 January 2017
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Abstract

We report measurements of the photon beam asymmetry Σ for the reactions γ - p→pπ0 and γ - p→pη 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, quasiparticle exchange and constrain the axial-vector component of the neutral meson production mechanism in these models. © 2017 American Physical Society

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