We report the first, kinematically-complete measurement of the differential cross section of Φ-meson 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.
|Original language||English (US)|
|Number of pages||5|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Feb 7 2011|
Bibliographical noteFunding Information:
We thank helpful comments from W.C. Chang, E. Oset and Q.J. Ye. We acknowledge the outstanding efforts of the staff of the Accelerator and the Physics Divisions at Jefferson Lab who made this experiment possible. This work was supported in part by the U.S. Department of Energy , the National Science Foundation , the Italian Istituto Nazionale di Fisica Nucleare , the French Centre National de la Recherche Scientique and Commissariat a l'Energie Atomique , and the National Research Foundation of Korea , and the UK Science and Technology Facilities Council (STFC) . The Southeastern Universities Research Association (SURA) operated the Thomas Jefferson National Accelerator Facility for the United States Department of Energy under contract DE-AC05-84ER40150 during this work.
- Near threshold
- Quasi free
- Φ meson photoproduction