2007/03/31 by W. C. Chang, K. Horie, S. Shimizu +67 · 2 citations
Physics and Astronomy · #Deuterium #Hadron #High-Energy Particle Collisions Research #Isoscalar #Isovector #Meson #Nuclear physics #Nucleon #Parity (physics) #Particle physics #Particle physics theoretical and experimental studies #Photon #Physics #Pomeron #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Vector meson #Vector meson dominance #hep-ex #nucl-ex
paper · pdf · doi:10.1016/j.physletb.2007.11.009
published as Phys.Lett.B658:209-215,2008 · 14 pages, 6 figures. Final published version
openalex publication_date 2007/11/26 · arxiv created 2008/01/03 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Differential cross sections and decay asymmetries for coherent ϕ-meson photoproduction from deuterons were measured for the first time at forward angles using linearly polarized photons at Eγ=1.5–2.4GeV. This reaction offers a unique way to directly access natural-parity pomeron dynamics and gluon exchange at low energies. The cross sections at zero degrees increase with increasing photon energy. The decay asymmetries demonstrate a complete dominance of natural-parity exchange processes, showing that isovector unnatural-parity π-meson exchange is small. Nevertheless the deduced cross sections of ϕ-mesons from nucleons contributed by isoscalar t-channel exchange processes are not well described by the conventional pomeron model.