First measurement of coherent ϕ-meson photoproduction from He4 near threshold

T. Hiraiwa et al. (LEPS Collaboration)
Phys. Rev. C 97, 035208 – Published 27 March 2018

Abstract

The differential cross sections and decay angular distributions for coherent ϕ-meson photoproduction from helium-4 are measured for the first time at forward angles with linearly polarized photons in the energy range Eγ=1.6852.385GeV. Thanks to the target with spin-parity JP=0+, unnatural-parity exchanges are absent, and thus natural-parity exchanges can be investigated clearly. The decay asymmetry with respect to photon polarization is shown to be very close to the maximal value. This ensures the strong dominance (>94%) of natural-parity exchanges in this reaction. To evaluate the contribution from natural-parity exchanges to the forward cross section (θ=0) for the γpϕp reaction near threshold, the energy dependence of the forward cross section (θ=0) for the γHe4ϕHe4 reaction is analyzed. The comparison to γpϕp data suggests that enhancement of the forward cross section arising from natural-parity exchanges and/or destructive interference between natural-parity and unnatural-parity exchanges is needed in the γpϕp reaction near threshold.

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  • Received 3 November 2017
  • Revised 21 January 2018

DOI:https://doi.org/10.1103/PhysRevC.97.035208

©2018 American Physical Society

Physics Subject Headings (PhySH)

Particles & FieldsNuclear Physics

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Vol. 97, Iss. 3 — March 2018

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