Diffractive $φ$-meson photoproduction on proton near threshold

Details Diffractive $φ$-meson photoproduction on proton near threshold Diffractive $φ$-meson photoproduction on proton near threshold

2005-06-10

arxiv.org/abs/nucl-ex/0506015v3

Phys.Rev.Lett. 95 (2005) 182001

Physics

Nuclear Physics

Nuclear Experiment

6 pages, error on the cross sections were corrected, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.95.182001

Photoproduction of $\phi$-meson on protons was studied by means of linearly polarized photons at forward angles in the low-energy region from threshold to $E_{\gamma}$= 2.37 GeV. The differential cross sections at $t = -|t|_{min}$ do not increase smoothly as $E_{\gamma}$ increases, but show a local maximum at around 2.0 GeV. The angular distributions demonstrate that $\phi$-mesons are photo-produced predominantly by helicity-conserving processes, and the local maximum is not likely due to unnatural-parity processes.

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