Abstract
We show that, in the Regge limit, beam asymmetries in η and η′ photoproduction are sensitive to hidden strangeness components. Under reasonable assumptions about the couplings we estimate the contribution of the ϕ Regge pole, which is expected to be the dominant hidden strangeness contribution. The ratio of the asymmetries in η′ and η production is estimated to be close to unity in the forward region 0<−t/GeV2≤1 at the photon energy Elab=9 GeV, relevant for the upcoming measurements at Jefferson Lab.
Highlights
In the Regge limit, beam asymmetries in η and η photoproduction are sensitive to hidden strangeness components
At Jefferson Lab, with photon energies Elab ∼ 5–11 GeV, meson resonances are produced via beam fragmentation, which is expected to be dominated by exchanges of leading Regge poles [12]
Production of the lightest multiplet of exotic mesons with J P C = 1−+ involves the same Regge exchanges that appear in production of ordinary pseudoscalar mesons, like π 0, η and η, and both natural ( P (−1) J = 1) and unnatural ( P (−1) J = −1) parity exchanges contribute
Summary
In the Regge limit, beam asymmetries in η and η photoproduction are sensitive to hidden strangeness components. At Jefferson Lab, with photon energies Elab ∼ 5–11 GeV, meson resonances are produced via beam fragmentation, which is expected to be dominated by exchanges of leading Regge poles [12]. It is related to the ratio of cross sections for natural and unnatural Regge exchanges and yields precise information about the resonance production mechanism. Using the recent measurements of the η beam asymmetry [13,15], one can extract the quantities.
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