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

来源：

PHYSICS LETTERS B | 2008年 / 658卷 / 05期

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

页码：209 / 215

页数：7

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