Forward coherent φ-meson photoproduction from deuterons near threshold

被引:30
作者
Chang, W. C. [1 ]
Horie, K. [2 ]
Shimizu, S. [2 ]
Miyabe, M. [3 ]
Ahn, D. S. [2 ,4 ]
Ahn, J. K. [4 ]
Akimune, H. [5 ]
Asano, Y. [6 ]
Date, S. [7 ]
Ejiri, H. [2 ,7 ]
Fukui, S. [8 ]
Fujimura, H. [3 ,9 ]
Fujiwara, M. [2 ,6 ]
Hasegawa, S. [2 ]
Hicks, K. [10 ]
Hotta, T. [2 ]
Imai, K. [3 ]
Ishikawa, T. [11 ]
Iwata, T. [12 ]
Kato, Y. [2 ]
Kawai, H. [13 ]
Kim, Z. Y. [9 ]
Kino, K. [2 ]
Kohri, H. [2 ]
Kumagai, N. [7 ]
Lin, P. J. [14 ]
Makino, S. [15 ]
Matsuda, T. [16 ]
Matsumura, T. [24 ]
Matsuoka, N. [2 ]
Mibe, T. [10 ]
Miyachi, Y. [17 ]
Morita, M. [2 ]
Muramatsu, N. [2 ,6 ]
Nakano, T. [2 ]
Niiyama, M.
Nomachi, M. [18 ]
Ohashi, Y. [7 ]
Ohkuma, H. [7 ]
Ooba, T. [13 ]
Oshuev, D. S. [1 ]
Rangacharyulu, C. [19 ]
Sakaguchi, A. [18 ]
Sasaki, T. [3 ]
Shagin, P. M. [20 ]
Shiino, Y. [13 ]
Shimizu, A. [2 ]
Shimizu, H. [11 ]
Sugaya, Y. [18 ]
Sumihama, M. [2 ,6 ]
机构
[1] Acad Sinica, Inst Phys, Taipei 11529, Taiwan
[2] Osaka Univ, Res Ctr Nucl Phys, Osaka 5670047, Japan
[3] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan
[4] Pusan Natl Univ, Dept Phys, Pusan 609735, South Korea
[5] Konan Univ, Dept Phys, Kobe, Hyogo 6588501, Japan
[6] Japan Atom Energy Agcy, Kansai Photon Sci Inst, Kizu, Kyoto 6190215, Japan
[7] Japan Synchrotron Radiat Res Inst, Mikazuki, Hyogo 6795198, Japan
[8] Nagoya Univ, Dept Phys & Astrophys, Aichi 4648602, Japan
[9] Seoul Natl Univ, Sch Phys, Seoul 151747, South Korea
[10] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA
[11] Tohoku Univ, Nucl Sci Lab, Sendai, Miyagi 9820826, Japan
[12] Yamagata Univ, Dept Phys, Yamagata 9908560, Japan
[13] Chiba Univ, Dept Phys, Chiba 2638522, Japan
[14] Natl Kaohsiung Normal Univ, Dept Phys, Kaohsiung 824, Taiwan
[15] Wakayama Med Coll, Wakayama 6418509, Japan
[16] Miyazaki Univ, Dept Appl Phys, Miyazaki 8892192, Japan
[17] Tokyo Inst Technol, Dept Phys, Tokyo 1528551, Japan
[18] Osaka Univ, Dept Phys, Osaka 5600043, Japan
[19] Univ Saskatchewan, Dept Phys, Saskatoon, SK, Canada
[20] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA
[21] Akita Res Inst Brain & Blood Vessels, Akita 0100874, Japan
[22] Osaka Univ, Inst Prot Res, Suita, Osaka 5650871, Japan
[23] Michigan State Univ, Dept Phys & Astron, Natl Supercond Cyclotron Lab, E Lansing, MI 48824 USA
[24] Natl Def Acad, Dept Appl Phys, Yokosuka, Kanagawa 2398686, Japan
基金
美国国家科学基金会;
关键词
photoproduction; phi-mesons; deuterons; coherent interaction;
D O I
10.1016/j.physletb.2007.11.009
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Differential cross sections and decay asymmetries for coherent phi-meson photoproduction from deuterons were measured for the first time at forward angles using linearly polarized photons at E-gamma = 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 pi-meson exchange is small. Nevertheless the deduced cross sections of phi-mesons from nucleons contributed by isoscalar t-channel exchange processes are not well described by the conventional pomeron model. (c) 2007 Elsevier B.V. All rights reserved.
引用
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页码:209 / 215
页数:7
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