Study of Exotic Baryon with High Intensity Photon Beam

• Project/Area Number: 17070004
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Osaka University
• Principal Investigator: NAKANO Takashi Osaka University, 核物理研究センター, 教授 (80212091)
• Co-Investigator(Kenkyū-buntansha): FUJIWARA Mamoru 大阪大学, 核物理研究センター, 教授 (00030031) ; SHIMIZU Hajime 東北大学, 理学研究科, 教授 (20178982) ; HOTTA Tomoaki 大阪大学, 核物理研究センター, 助教 (30332745) ; MURAMATSU Norihito 大阪大学, 核物理研究, 特任助教 (40397766) ; YOSOI Masaru 大阪大学, 核物理研究センター, 准教授 (80183995) ; AJIMURA Shuhei 大阪大学, 核物理研究センター, 准教授 (10273575)
• Project Period (FY): 2005 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥227,700,000 (Direct Cost: ¥227,700,000); Fiscal Year 2009: ¥12,800,000 (Direct Cost: ¥12,800,000); Fiscal Year 2008: ¥39,800,000 (Direct Cost: ¥39,800,000); Fiscal Year 2007: ¥39,800,000 (Direct Cost: ¥39,800,000); Fiscal Year 2006: ¥63,900,000 (Direct Cost: ¥63,900,000); Fiscal Year 2005: ¥71,400,000 (Direct Cost: ¥71,400,000)
• Keywords: シータ粒子 / ファイ中間子 / ペンタクォーク / レーザー電子光ビーム / レーザー電子光

Research Abstract

We, the LEPS collaboration, first reported the evidence for the Θ^+ pentaquark production from a nuclear target by using Laser-Electron Photon beam. To confirm the existence of the Θ^+, we carried out further experiments with a deuterium target. By correcting the Fermi motion effect, the Θ^+ peak was seen in the mass spectrum and reported on Physical Review C.

Research Products

• [Journal Article] Measurement of spin-density matrix elements for φ-meson photoproduction from protons and deuterons near threshold (2010)
  • Author(s): W.C.Chang, D.S.Ahn, J.K.Ahn, H.Akimune, Y.Asano, S.Date, H.Ejiri, H.Fujimura, M.Fujiwara, S.Fukui, S.Hasegawa, K.Hicks, K.Horie, T.Hotta, K.Imai, T.Ishikawa, T.Iwata, Y.Kato, H.Kawai, K.Kino, H.Kohri, N.Kumagai, P.J.Lin, S.Makino, T.Matsuda, T.Matsumura, N.Matsuoka, Mibe, M.Miyabe, Y.Miyachi, N.Muramatsu, T.Nakano, M.Niiyama, M.Nomachi, Y.Ohashi, H.Ohkuma, T.Ooba, D.S.Oshuev, C.Rangacharyulu, A.Sakaguchi, P.M.Shagin, Y.Shiino, H.Shimizu, Y.Sugaya, M.Sumihama, Y.Toi, H.Toyokawa, M.Uchida, A.Wakai, C.W.Wang, S.C.Wang, K.Yonehara, T.Yorita, M.Yoshimura, M.Yosoi, R.G.T.Zegers
  • Journal Title: Phys.Rev.C 82 Pages: 15205-15205
• [Journal Article] Near-Threshold Λ(1520) Production by the γp→K+Λ(1520) Reaction at Forward K+ Angles (2010)
  • Author(s): H.Kohri, D.S.Ahn, J.K.Ahn, H.Akimune, Y.Asano, W.C.Chang, S.Date, H.Ejiri, S.Fukui, H.Fujimura, M.Fujiwara, S.Hasegawa, K.Hicks, A.Hosaka, T.Hotta, K.Imai, T.Ishikawa, T.Iwata, H.Kawai, Z.Y.Kim, K.Kino, N.Kumagai, S.Makino, T.Matsuda, T.Matsumura, N.Matsuoka, T.Mibe, M.Miyabe, Y.Miyachi, M.Morita, N.Muramatsu, T.Nakano, S.i.Nam, M.Niiyama, M.Nomachi, Y.Ohashi, H.Ohkuma, T.Ooba, D.S.OC.Rangacharyulu, A.Sakaguchi, T.Sasaki, P.M.Shagin, Y.Shiino, A.Shimizu, H.Shimizu, Y.Sugaya, M.Sumihama, A.I.Titov, Y.Toi, H.Toyokawa, A.Wakai, C.W.Wang, S.C.Wang, K.Yonehara, T.Yorita, M.Yoshimura, M.Yosoi, R.G.T.Zegers
  • Journal Title: Phys.Rev.Lett. 104 Pages: 172001-172001
• [Journal Article] Measurement of the incoherent γd→φpn photoproduction near threshold (2010)
  • Author(s): W.C.Chang, M.Miyabe, T.Nakano, D.S.Ahn, J.K.Ahn, H.Akimune, Y.Asano, S.Date, H.Ejiri, H.Fujimura, M.Fujiwara, S.Fukui, H.Hasegawa, K.Hicks, K.Horie, Hotta, K.Imai, T.Ishikawa, T.Iwata, Y.Kato, H.Kawai, K.Kino, H.Kohri, N.Kumagai, S.Makino, T.Matsuda, T.Matsumura, N.Matsuoka, T.Mibe, M.Miyabe, Y.Miyachi, T.Hotta, K.Imai, T.Ishikawa, T.Iwata, Y.Kato, H.Kawai, K.Kino, H.Kohri, N.Kumagai, S.Makino, T.Matsuda, T.Matsumura, N.Matsuoka, T.Mibe, Y.Miyachi, T.Nakano, M.Niiyama, M.Nomachi, Y.Ohashi, H.Ohkuma, T.Ooba, D.S.Oshuev, C.Rangacharyulu, A.Sakaguchi, P.M.Shagin, Y.Shiino, N.Muramatsu, M.Niiyama, M.Nomachi, Y.Ohashi, H.Ohkuma, T.Ooba, D.S.Oshuev, C.Rangacharyulu, A.Sakaguchi, P.M.Shagin, Y.Shiino, H.Shimizu, Y.Sugaya, M.Sumihama, Y.Toi, H.Toyokawa, A.Wakai, C.W.Wang, S.C.Wang, K.Yonehara, T.Yorita, M.Yoshimura, H.Shimizu, Y.Sugaya, M.Sumihama, Y.Toi, H.Toyokawa, M.Uchida, A.Wakai, C.W.Wang, S.C.Wang, K.Yonehara, T.Yorita, M.Yoshimura, M.Yosoi, R.G.T.Zegers
  • Journal Title: Phys.Lett.B 684 Pages: 6-6
• [Journal Article] Measurement of the incoherent Yd→Φpn photoprodution near threshold (2010)
  • Author(s): W.C.Chang, M.Miyabe, T.Nakano, 他52名
  • Journal Title: Physics Letters B 684 Pages: 6-10
  • Peer Reviewed
• [Journal Article] Backward-angle η photoproduction from protons at Eγ=1.6-2.4 GeV (2009)
  • Author(s): M.Sumihama, D.S.Ahn, J.K.Ahn, H.Akimune, Y.Asano, W.C.Chang, S.Date, H.Ejiri, H.Fujimura, T.Nakano, M.Fujiwara, S.Fukui, S.Hasegawa, K.Hicks, T.Hotta, K.Imai, T.Ishikawa, T.Iwata, Y.Kato, H.Kawai, K.Kino, H.Kohri, N.Kumagai, T.Matsuda, T.Matsumura, T.Mibe, M.Miyabe, N.Muramatsu, T.Nakano, M.Niiyama, M.Nomachi, Y.Oashi, H.Ohuma, T.Ooba, D.S.Oshuev, C.Rangacharyulu, A.Sakaguchi, P.M.Shagin, Y.Shiino, A.Shimizu, H.Shimizu, Y.Sugaya, Y.Toi, H.Toyokawa, A.Wakai, C.W.Wang, S.C.Wang, K.Yonehara, T.Yorita, M.Yoshimura, M.Yosoi, R.G.T.Zegers
  • Journal Title: Phys.Rev.C 80
• [Journal Article] Near-threshold photoproduction of A(1520) from protons and deuterons (2009)
  • Author(s): N.Muramatsu, J.Y.Chen, W.C.Chang, D.S.Ahn, J.K.Ahn, H.Akimune, Y.Asano, S.Date, H.Ejiri, H.Fu j imura, M.Fujiwara, S.Fukui, S.Hasegawa, K.Hicks, K.Horie, T.Hotta, K.Imai, T.Ishikawa, T.Iwata, Y.Kato, H.Kawai, K.Kino, H.Kohri, N.Kumagai, S.Makino, T.Matsuda, T.Matsumura, N.Matsuoka, T.Mibe, M.Miyabe, Y.Miyachi, T.Nakano, M.Niiyama, M.Nomachi, Y.Ohashi, H.Ohkuma, T.Ooba, D.S.Oshuev, C.Rangacharyulu, A.Sakaguchi, P.M.Shagin, Y.Shiino, 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
  • Journal Title: Phys.Rev.Lett. 103 Pages: 12001-12001
• [Journal Article] Evidence for the θ in the γd-+K'K-pn reaction by detecting K+K- pairs (2009)
  • Author(s): T.Nakano, N.Muramatsu, D.S.Ahn, J.K.Ahn, H.Akimune, Y.Asano, W.C.Chang, S.Date, H.Ejiri, H.Fu j imura, M.Fu j iwara, S.Fukui, S.Hasegawa, K.Hicks, K.Horie, T.Hotta, K.Imai, T.Ishikawa, T.Iwata, Y.Kato, H.Kawai, Z.Y.Kim, K.Kino, H.Kohri, N.Kumagai, S.Makino, T.Matsuda, N.Matsuoka, T.Matsumura, T.Mibe, M.Miyabe, Y.Miyachi, M.Niiyama, M.Nomachi, Y.Ohashi, H.Ohkuma, T.Ooba, D.S.Oshuev, C.Rangacharyulu, A.Sakaguchi, 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
  • Journal Title: Phys.Rev.C 79 Pages: 25210-25210
• [Journal Article] Cross sections and beam asymmetry for K+Σ* photoproduction from the deuteron at Eγ=1.5-2.4 GeV (2009)
  • Author(s): K.Hicks, D.Keller, H.Kohri, D.S.Ahn, J.K.Ahn, H.Akimune, Y.Asano, W.C.Chang, S.Date, H.Ejiri, S.Fukui, H.Fujimura, M.Fujiwara, S.Hasegawa, T.Hotta, K.Imai, T.Ishikawa, T.Iwata, Y.Kato, H.Kawai, Z.Y.Kim, K.Kino, N.Kumagai, S.Makino, T.Matsuda, T.Matsumura, N.Matsuoka, T.Mibe, M.Miyabe, Y.Miyachi, M.Morita, N.Muramatsu, T.Nakano, M.Niiyama, M.Nomachi, Y.Oh, Y.Ohashi, H.Ohkuma, T.Ooba, J.Parker, 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
  • Journal Title: Phys.Rev.Lett. 102 Pages: 12501-12501
• [Journal Article] Backward-angle eta photoproduction from protons at E(gamma)=1.6-2.4 GeV (2009)
  • Author(s): M.Sumihama, 他50名
  • Journal Title: Physical Review C 80
  • Peer Reviewed
• [Journal Article] Evidence for the Θ+ in the γd→K^+ K^- pnreaction by detecting K^+ K^-patrs (2009)
  • Author(s): T. Nakano, 他55名
  • Journal Title: Physical Review C 79
  • Peer Reviewed
• [Journal Article] Photoproduction of Λ(1405) and Σ0(1385) on the proton at Eγ=1.5-2.4 GeV (2008)
  • Author(s): M.Niiyama, H.Fujimura, D.S.Ahn, J.K.Ahn, S.Ajimura, H.C.Bhang, T.H.Chang, W.C.Chang, J.Y.Chen, S.Date, S.Fukui, H.Funahashi, K.Hicks, K.Horie, T.Hotta, K.Imai, T.Ishikawa, Y.Kato, K.Kino, H.Kohri, S.Makino, T.Matsumura, T.Mibe, K.Miwa, M.Miyabe, N.Muramatsu, M.Nakamura, T.Nakano, Y.Nakatsugawa, Y.Ohashi, D.S.Oshuev, J.D.Parker, N.Saito, T.Sawada, Y.Sugaya, M.Sumihama, J.L.Tang, M.Uchida, C.W.Wang, T.Yorita, M.Yosoi
  • Journal Title: Phys.Rev.C 78 Pages: 35202-35202
• [Journal Article] Forward coerent φ-eson photoproduction from deuterons near threshold (2008)
  • Author(s): W.C.Chang, K.Horie, S.Shimizu, M.Miyabe, D.S.Ahn, J.K.Ahn, H.Akimune, Y.Asano, S.Date, H.Ejiri, S.Fukui, H.Fujimura, M.Fujiwara, S.Hasegawa, K.Hicks, T.Hotta, K.Imai, T.Ishikawa, T.Iwata, Y.Kato, H.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.Yosoi, R.G.T.Zegers
  • Journal Title: Phys.Lett.B 658 Pages: 209-209
• [Journal Article] Forward coherent φ-meson photoproduction from deuterons near threshold (2008)
  • Author(s): W.C. Chang, et. al.
  • Journal Title: Physics Letters B 658 Pages: 209-215
  • Peer Reviewed
• [Journal Article] Backward-angle photoproduction of π0 mesons on the proton at Eγ = 1.5-2.4 GeV (2007)
  • Author(s): M.Sumihama, J.K.Ahn, H.Akimune, Y.Asano, W.C.Chang, S.Date, H.Ejiri, H.Fujimura, M.Fujiwara, K.Hicks, T.Hotta, K.Imai, T.Ishikawa, T.Iwata, H.Kawai, Z.Y.Kim, K.Kino, H.Kohri, N.Kumagai, S.Makino, T.Matsumura, N.Matsuoka, T.Mibe, M.Miyabe, 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.Sato, P.M.Shagin, Y.Shiino, H.Shimizu, Y.Sugaya, H.Toyokawa, A.Wakai, C.W.Wang, S.C.Wang, K.Yonehara, T.Yorita, M.Yosoi, R.G.T.Zegers
  • Journal Title: Phys.Lett.B 657 Pages: 32-32
• [Presentation] Evidence for Θ^+ photo-production at LEPS (2007)
  • Author(s): 中野 貴志
  • Organizer: The 11th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon
  • Place of Presentation: Julich,Germany
  • Year and Date: 2007-09-12
• [Remarks]
  • URL: http://www.rcnp.osaka-u.ac.jp/Divisions/np1-b/index.html