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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) USM
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.
DOI
10.1103/PhysRevC.95.042201
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.
Subjects
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