Near-threshold photoproduction of ϕ mesons from deuterium (original) (raw)

We report the first, kinematically-complete measurement of the differential cross section of φmeson photoproduction from deuterium near the production threshold for a proton using the CLAS detector and a tagged-photon beam in Hall B at Jefferson Lab. The measurement was carried out by a triple coincidence detection of a proton, K + and K − near the theoretical production threshold of 1.57 GeV. The extracted differential cross sections dσ dt for the initial photon energy range of 1.65-1.75 GeV are consistent with predictions based on a quasifree mechanism. Our finding is different from recent LEPS results on φ-meson photoproduction from deuterium in a similar incident photon energy range, but in a different momentum transfer region.