Beam asymmetry ς for the photoproduction of η and η′ mesons at Eγ=8.8 GeV

The GlueX Collaboration

Research output: Contribution to journalArticle

Abstract

We report on the measurement of the beam asymmetry ς for the reactions γ - p→pη and γ - p→pη′ from the GlueX experiment using an 8.2-8.8-GeV linearly polarized tagged photon beam incident on a liquid hydrogen target in Hall D at Jefferson Laboratory. These measurements are made as a function of momentum transfer -t with significantly higher statistical precision than our earlier η measurements and are the first measurements of η′ in this energy range. We compare the results to theoretical predictions based on t-channel quasiparticle exchange. We also compare the ratio of ςη to ςη′ to these models as this ratio is predicted to be sensitive to the amount of ss exchange in the production. We find that photoproduction of both η and η′ is dominated by natural parity exchange with little dependence on -t.

Original languageEnglish
Article number052201
JournalPhysical Review C
Volume100
Issue number5
DOIs
Publication statusPublished - 27 Nov 2019

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photoproduction
mesons
asymmetry
liquid hydrogen
photon beams
momentum transfer
parity
predictions
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Beam asymmetry ς for the photoproduction of η and η′ mesons at Eγ=8.8 GeV. / The GlueX Collaboration.

In: Physical Review C, Vol. 100, No. 5, 052201, 27.11.2019.

Research output: Contribution to journalArticle

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title = "Beam asymmetry ς for the photoproduction of η and η′ mesons at Eγ=8.8 GeV",
abstract = "We report on the measurement of the beam asymmetry ς for the reactions γ - p→pη and γ - p→pη′ from the GlueX experiment using an 8.2-8.8-GeV linearly polarized tagged photon beam incident on a liquid hydrogen target in Hall D at Jefferson Laboratory. These measurements are made as a function of momentum transfer -t with significantly higher statistical precision than our earlier η measurements and are the first measurements of η′ in this energy range. We compare the results to theoretical predictions based on t-channel quasiparticle exchange. We also compare the ratio of ςη to ςη′ to these models as this ratio is predicted to be sensitive to the amount of ss exchange in the production. We find that photoproduction of both η and η′ is dominated by natural parity exchange with little dependence on -t.",
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T1 - Beam asymmetry ς for the photoproduction of η and η′ mesons at Eγ=8.8 GeV

AU - The GlueX Collaboration

AU - Adhikari, S.

AU - Ali, A.

AU - Amaryan, M.

AU - Austregesilo, A.

AU - Barbosa, F.

AU - Barlow, J.

AU - Barnes, A.

AU - Barriga, E.

AU - Barsotti, R.

AU - Beattie, T. D.

AU - Berdnikov, V. V.

AU - Black, T.

AU - Boeglin, W.

AU - Boer, M.

AU - Briscoe, W. J.

AU - Britton, T.

AU - Brooks, W. K.

AU - Cannon, B. E.

AU - Cao, N.

AU - Chudakov, E.

AU - Cole, S.

AU - Cortes, O.

AU - Crede, V.

AU - Dalton, M. M.

AU - Daniels, T.

AU - Deur, A.

AU - Dobbs, S.

AU - Dolgolenko, A.

AU - Dotel, R.

AU - Dugger, M.

AU - Dzhygadlo, R.

AU - Egiyan, H.

AU - Erbora, T.

AU - Ernst, A.

AU - Eugenio, P.

AU - Fanelli, C.

AU - Fegan, S.

AU - Foda, A. M.

AU - Foote, J.

AU - Frye, J.

AU - Furletov, S.

AU - Gan, L.

AU - Gasparian, A.

AU - Gevorgyan, N.

AU - Gleason, C.

AU - Goetzen, K.

AU - Goncalves, A.

AU - Goryachev, V. S.

AU - Guo, L.

AU - Lyubovitskij, V.

PY - 2019/11/27

Y1 - 2019/11/27

N2 - We report on the measurement of the beam asymmetry ς for the reactions γ - p→pη and γ - p→pη′ from the GlueX experiment using an 8.2-8.8-GeV linearly polarized tagged photon beam incident on a liquid hydrogen target in Hall D at Jefferson Laboratory. These measurements are made as a function of momentum transfer -t with significantly higher statistical precision than our earlier η measurements and are the first measurements of η′ in this energy range. We compare the results to theoretical predictions based on t-channel quasiparticle exchange. We also compare the ratio of ςη to ςη′ to these models as this ratio is predicted to be sensitive to the amount of ss exchange in the production. We find that photoproduction of both η and η′ is dominated by natural parity exchange with little dependence on -t.

AB - We report on the measurement of the beam asymmetry ς for the reactions γ - p→pη and γ - p→pη′ from the GlueX experiment using an 8.2-8.8-GeV linearly polarized tagged photon beam incident on a liquid hydrogen target in Hall D at Jefferson Laboratory. These measurements are made as a function of momentum transfer -t with significantly higher statistical precision than our earlier η measurements and are the first measurements of η′ in this energy range. We compare the results to theoretical predictions based on t-channel quasiparticle exchange. We also compare the ratio of ςη to ςη′ to these models as this ratio is predicted to be sensitive to the amount of ss exchange in the production. We find that photoproduction of both η and η′ is dominated by natural parity exchange with little dependence on -t.

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