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

@article{Ghoul2017MeasurementOT,
title={Measurement of the beam asymmetry $\Sigma$ for $\pi$0 and $\eta$ photoproduction on the proton at E$\gamma$=9 GeV},
author={GlueX Collaboration H. Al Ghoul and E. G. Anassontzis and Alexander Austregesilo and F. Barbosa and A. Barnes and Tegan Beattie and D. W. Bennett and V. Berdnikov and Timothy Charles Black and Werner U. Boeglin and William J. Briscoe and William Brooks and Bradford E. Cannon and O. A. Chernyshov and Eugene Chudakov and Volker Crede and Mark Macrae Dalton and Alexandre Deur and Sean A Dobbs and A. Dolgolenko and Michael Dugger and Roman Dzhygadlo and Hovanes Egiyan and Paul Michael Eugenio and C. Fanelli and Ahmed Foda and John Frye and Sergey Furletov and Liping Gan and A. Gasparian and Arsenii Gerasimov and Nerses Gevorgyan and Klaus Goetzen and V. S. Goryachev and L . B. Guo and Hayk Hakobyan and John Hardin and A. Henderson and G M Huber and David Ireland and M. M. Ito and Naomi Jarvis and R. T. Jones and Vanik Kakoyan and Mahmoud Kamel and F. Klein and Ralf Kliemt and C. Kourkoumeli and Sergey Kuleshov and Ilya I. Kuznetsov and Manuel Lara and I. Larin and David Lawrence and William Levine and Kenneth Livingston and G. J. Lolos and Valery E. Lyubovitskij and David Mack and P. T. Mattione and V. Matveev and Michael Mccaughan and M. E. Mccracken and William M. Mcginley and Justin McIntyre and R. Mendez and Christopher Meyer and Rory Allen Miskimen and Ross E. Mitchell and Fridah Mokaya and Keiichi Moriya and F. Nerling and Grigory Nigmatkulov and N. Ochoa and Alexander Ostrovidov and Zisis Papandreou and Maria Patsyuk and R. Pedroni and Michael R. Pennington and Lubomir Pentchev and Krisztian Peters and Eric Pooser and B. Pratt and Yi Qiang and Joerg Reinhold and Barry Ritchie and Luke Robison and D. Romanov and Claudio Guedes Salgado and Reinhard A Schumacher and Cornelius Schwarz and Jochen Schwiening and A. Yu. Semenov and Irina A. Semenova and Kamal K. Seth and Matthew R. Shepherd and E. S. Smith and Daniel I. Sober and Alexander Y. Somov and S. V. Somov and O. Soto and Nathan Andrew Sparks and Michael Staib and J. Stevens and Igor I. Strakovsky and Adesh Subedi and V. V. Tarasov and S. Taylor and Aram Teymurazyan and I. A. Tolstukhin and Amiran Tomaradze and Alam Toro and Aristeidis Tsaris and Georgios I. Vasileiadis and I. Vega and Natalie Kathleen Walford and Dominik Werthmuller and Timothy Whitlatch and M. Williams and Elliott Wolin and T. Xiao and Jonathan Zarling and Z. Y. Zhang and B. Zihlmann and V. Mathieu and J. Nys},
journal={Physical Review C},
year={2017},
volume={95},
pages={042201}
}
• Published 27 January 2017
• Physics
• Physical Review C
We report measurements of the photon beam asymmetry Σ for the reactions γp→pπ 0 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 π 0 measurements and are the first η measurements in this energy regime. The results are compared with theoretical predictions based on t -channel…

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