Near-Threshold Photoproduction of Λ(1520) from Protons and Deuterons

被引：33

作者：

Muramatsu, N. ^{[1
,2
]}

Chen, J. Y. ^{[3
,4
]}

Chang, W. C. ^{[4
]}

Ahn, D. S. ^{[1
,5
]}

Ahn, J. K. ^{[5
]}

Akimune, H. ^{[6
]}

Asano, Y. ^{[2
]}

Date, S. ^{[7
]}

Ejiri, H. ^{[1
,7
]}

Fujimura, H. ^{[8
,9
]}

Fujiwara, M. ^{[1
,2
]}

Fukui, S. ^{[10
]}

Hasegawa, S. ^{[1
]}

Hicks, K. ^{[11
]}

Horie, K. ^{[1
]}

Hotta, T. ^{[1
]}

Imai, K. ^{[8
]}

Ishikawa, T. ^{[9
]}

Iwata, T. ^{[12
]}

Kato, Y. ^{[1
]}

Kawai, H. ^{[13
]}

Kino, K. ^{[1
]}

Kohri, H. ^{[1
]}

Kumagai, N. ^{[7
]}

Makino, S. ^{[14
]}

Matsuda, T. ^{[15
]}

Matsumura, T. ^{[16
]}

Matsuoka, N. ^{[1
]}

Mibe, T. ^{[11
]}

Miyabe, M. ^{[8
]}

Miyachi, M. ^{[17
]}

Nakano, T. ^{[1
]}

Niiyama, M. ^{[8
,18
]}

Nomachi, M. ^{[19
]}

Ohashi, Y. ^{[7
]}

Ohkuma, H. ^{[7
]}

Ooba, T. ^{[13
]}

Oshuev, D. S. ^{[4
]}

Rangacharyulu, C. ^{[20
]}

Sakaguchi, A. ^{[19
]}

Shagin, P. M. ^{[21
]}

Shiino, Y. ^{[13
]}

Shimizu, H. ^{[9
]}

Sugaya, Y. ^{[19
]}

Sumihama, M. ^{[1
]}

Toi, Y. ^{[15
]}

Toyokawa, H. ^{[7
]}

Wakai, A. ^{[22
]}

Wang, C. W. ^{[4
]}

Wang, S. C. ^{[4
]}

机构：

[1] Osaka Univ, Nucl Phys Res Ctr, Osaka 5670047, Japan

[2] Japan Atom Energy Agcy, Kansai Photon Sci Inst, Kyoto 6190215, Japan

[3] Natl Sun Yat Sen Univ, Dept Phys, Kaohsiung 804, Taiwan

[4] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

[5] Pusan Natl Univ, Dept Phys, Pusan 609735, South Korea

[6] Konan Univ, Dept Phys, Kobe, Hyogo 6588501, Japan

[7] Japan Synchrotron Radiat Res Inst, Sayo, Hyogo 6795143, Japan

[8] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

[9] Tohoku Univ, Nucl Sci Lab, Sendai, Miyagi 9820826, Japan

[10] Nagoya Univ, Dept Phys, Aichi 4648602, Japan

[11] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA

[12] Yamagata Univ, Dept Phys, Yamagata 9908560, Japan

[13] Chiba Univ, Dept Phys, Chiba 2638522, Japan

[14] Wakayama Med Univ, Wakayama 6418509, Japan

[15] Miyazaki Univ, Dept Appl Phys, Miyazaki 8892192, Japan

[16] Natl Def Acad Japan, Kanagawa 2398686, Japan

[17] Tokyo Inst Technol, Dept Phys, Tokyo 1528551, Japan

[18] RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan

[19] Osaka Univ, Dept Phys, Osaka 5600043, Japan

[20] Univ Saskatchewan, Dept Phys & Engn Phys, Saskatoon, SK S7N 5E2, Canada

[21] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

[22] Akita Res Inst Brain & Blood Vessels, Akita 0100874, Japan

[23] Osaka Univ, Inst Prot Res, Osaka 5650871, Japan

[24] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 01期

关键词：

THETA(+);

D O I：

10.1103/PhysRevLett.103.012001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Photoproduction of Lambda(1520) with liquid hydrogen and deuterium targets was examined at photon energies below 2.4 GeV in the SPring-8 LEPS experiment. For the first time, the differential cross sections were measured at low energies and with a deuterium target. A large asymmetry of the production cross sections from protons and neutrons was observed at backward K(+/0) angles. This suggests the importance of the contact term, which coexists with t-channel K exchange under gauge invariance. This interpretation was compatible with the differential cross sections, decay asymmetry, and photon beam asymmetry measured in the production from protons at forward K(+) angles.

引用

页数：5

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