Forward coherent ϕ-meson photoproduction from deuterons near threshold

W. C. Chang, K. Horie, S. Shimizu, M. Miyabe, D. S. Ahn, J. K. Ahn, H. Akimune, Y. Asano, S. Daté, H. Ejiri, S. Fukui, H. Fujimura, M. Fujiwara, S. Hasegawa, K. Hicks, T. Hotta, K. Imai, T. Ishikawa, T. Iwata, Y. KatoH. Kawai, Z. Y. Kim, K. Kino, H. Kohri, N. Kumagai, P. J. Lin, S. Makino, T. Matsuda, T. Matsumura, N. Matsuoka, T. Mibe, Y. Miyachi, M. Morita, N. Muramatsu, T. Nakano, M. Niiyama, M. Nomachi, Y. Ohashi, H. Ohkuma, T. Ooba, D. S. Oshuev, C. Rangacharyulu, A. Sakaguchi, T. Sasaki, P. M. Shagin, Y. Shiino, A. Shimizu, H. Shimizu, Y. Sugaya, M. Sumihama, Y. Toi, H. Toyokawa, A. Wakai, C. W. Wang, S. C. Wang, K. Yonehara, T. Yorita, M. Yoshimura, M. Yosoi, R. G.T. Zegers

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Differential cross sections and decay asymmetries for coherent φ{symbol}-meson photoproduction from deuterons were measured for the first time at forward angles using linearly polarized photons at Eγ = 1.5 - 2.4   GeV. 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{symbol}-mesons from nucleons contributed by isoscalar t-channel exchange processes are not well described by the conventional pomeron model.

Original languageEnglish
Pages (from-to)209-215
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume658
Issue number5
DOIs
Publication statusPublished - 2008 Jan 10
Externally publishedYes

Bibliographical note

Funding Information:
The authors thank the SPring-8 staff for supporting the BL33LEP beam line and the LEPS experiment. We thank A.I. Titov for many fruitful discussions. This research was supported in part by the Ministry of Education, Science, Sports and Culture of Japan, by the National Science Council of Republic of China (Taiwan), Korea Research Foundation (KRF) and National Science Foundation (USA).

Keywords

  • Coherent interaction
  • Deuterons
  • Photoproduction
  • φ{symbol}-mesons

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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