Erratum: Analysis of the near-threshold peak structure in the differential cross section ofφ-meson photoproduction: Indication of a missing resonance with non-negligible strangeness content [Phys. Rev. C86, 015203 (2012)

Abstract

The details of the analysis of the near-threshold bump structure in the forward differential cross section of the φ-meson photoproduction to determine whether it is a signature of a resonance, together with more extensive results, are presented. The analysis is carried out in an effective Lagrangian approach which includes Pomeron and (π, η) exchanges in the t channel, and contributions from the sand u-channel excitations of a postulated nucleon resonance. In addition to the differential cross sections, we use the nine spin-density matrix elements as recently measured, instead of the φ-meson decay angular distributions which depend only on six spin-density matrix elements as was done before, to constrain the resonance parameters. We conclude that indeed the nonmonotonic behavior, along with the other experimental data as reported by LEPS, can only be explained with an assumption of the excitation of a resonance of spin 3/2, as previously reported. However, both parities of (±) can account for the data equally well with almost identical mass of 2.08± 0.04 GeV and width of 0.501 ± 0.117 and 0.570 ± 0.159 for 3/2 and 3/2, respectively. The ratio of the helicity amplitudes A 1