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Measurement of the beam asymmetry Σ for π0 and η photoproduction on the proton at Eγ=9 GeV
Journal
Physical Review C
Date Issued
2017-04-24
Author(s)
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.
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.
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.
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. Yu
Semenova, I. A.
Seth, K. K.
Shepherd, M. R.
Smith, E. S.
Sober, D. I.
Somov, A.
Somov, S.
Soto, O.
Abstract
We report measurements of the photon beam asymmetry 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.
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.
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