The cross section for φ meson photoproduction on the proton has been measured for the first time up to a four-momentum transfer −t=4GeV2, using the CLAS detector at the Thomas Jefferson National Accelerator Facility. At low four-momentum transfer, the differential cross section is well described by Pomeron exchange. At large four-momentum transfer, above −t=1.8GeV2, the data support a model where the Pomeron is resolved into its simplest component, two gluons, which may couple to any quark in the proton and in the φ.
Physical Review Letters
Anciant, E; Biselli, Angela; and CLAS Collaboration, "Photoproduction of φ(1020) mesons on the
proton at large momentum transfer" (2000). Physics Faculty Publications. 109.
E. Anciant et al. [CLAS Collaboration], "Photoproduction of φ(1020) mesons on the proton at large momentum transfer", Physical Review Letters 85.22 (2000) DOI:10.1103/PhysRevLett.85.4682