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

Al Ghoul, H. et al. (2017) Measurement of the beam asymmetry Σ for π0 and η photoproduction on the proton at Eγ=9 GeV. Physical Review C, 95(4), 042201(R). (doi: 10.1103/PhysRevC.95.042201)

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We report measurements of the photon beam asymmetry Σ for the reactions ⃗γp→pπ0 and ⃗γp→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.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Werthmueller, Dr Dominik and Livingston, Dr Kenneth and Pennington, Dr Michael and Ireland, Professor David
Authors: 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., and Nys, J.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review C
Publisher:American Physical Society
ISSN (Online):1089-490X
Published Online:24 April 2017
Copyright Holders:Copyright © 2017 American Physical Society
First Published:First published in Physical Review C 95(4):042201(R)
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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