Study of correlation of confined quarks using high-energy Laser-Electron photon beam

利用高能激光-电子光子束研究受限夸克相关性

• 批准号: 22244026
• 负责人: TAKASHI Nakano
• 金额: $ 26.71万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22244026/
• 关键词: レーザー電子光ビーム; シータ粒子; ファイ中間子; ハドロン; クォーク; TOPカウンター; ベクターK中間子; イータ中間子

The linearly polarized photon beam is produced by backward-Compton scattering of laser photons from 8 GeV electrons at BL33LEP. The curr ent LEPS facility studies photo-production of hadrons in the forward angles, where the high linear polarization plays an essential role to decompose various reaction processes. New DUV laser was introduced to LEPS, which improved the maximum energy from 2.4 GeV to 3 GeV. The parallel injection system was constructed and the beam intensity was improved by a factor of 2. The penta-quark Θ+study was carried out in the ・ d → K+Kp n reactions. background processes due to γp reactions were identified by energy loss information in a plastic counter that was placed just after the liquid-deuterium target. A clear signal enhancement was seen in the γn contributions.

线偏振光子束是在BL33LEP上由激光光子与8 GeV电子的后向康普顿散射产生的。Current LEPS设备研究前角强子的光产生，在那里高的线偏振对分解各种反应过程起着至关重要的作用。在LEPS中引入了新的DUV激光器，将最大能量从2.4GeV提高到3GeV。建立了平行注入系统，将束流强度提高了2倍。对五夸克Θ+在·d→K+Kp n反应中进行了研究。由γ-p反应引起的背景过程是通过放置在液重靶后面的塑料计数器中的能量损失信息来识别的。在γn贡献中可见明显的信号增强。

项目成果

Measurement of spin-density matrix elements for φ-meson photoproduction from protons and deuterons near threshold

• DOI: 10.1103/physrevc.82.015205
• 发表时间: 2010-06
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: We-Fu Chang;D. S. Ahn;D. S. Ahn;J. K. Ahn;H. Akimune;Y. Asano;S. Dat'e;H. Ejiri;H. Fujimura;M. Fujiwara;M. Fujiwara;S. Fukui;S. Hasegawa;K. Hicks;K. Horie;T. Hotta;K. Imai;Takatsugu Ishikawa;T. Iwata;Y. Kato;H. Kawai;K. Kino;H. Kohri;N. Kumagai;P. Lin;S. Makino;T. Matsuda;T. Matsumura;N. Matsuoka;T. Mibe;M. Miyabe;Y. Miyachi;N. Muramatsu;T. Nakano;M. Niiyama;M. Nomachi;Y. Ohashi;H. Ohkuma;T. Ooba;D. Oshuev;C. Rangacharyulu;A. Sakaguchi;P. Shagin;Y. Shiino;H. Shimizu;Y. Sugaya;M. Sumihama;Y. Toi;H. Toyokawa;M. Uchida;A. Wakai;Chun-Chieh Wang;S. C. Wang;K. Yonehara;T. Yorita;M. Yoshimura;M. Yosoi;R. Zegers

Highlights and Prospects from LEPS and LEPS2

LEPS 和 LEPS2 的亮点和展望

• 发表时间: 2010
• 作者: 下井倉ともみ;土橋一仁;西村美紀;落合哲;片倉翔;澤村将太郎;山日彬史;松本倫明;中村文隆;廣田朋也;大西利和;小川英夫;木村公洋;西村淳;徳田一起;Eiji Yanagida;中野貴志
• 通讯作者: 中野貴志

Near-Threshold Λ(1520) Production by the γp→K+Λ(1520) Reaction at Forward K+ Angles

γp→K+Λ(1520) 反应在正向 K+ 角处产生近阈值 Λ(1520)

• 发表时间: 2010
• 期刊: Phys.Rev.Lett. 104
• 作者: 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.Matsu
• 通讯作者: N.Matsu

Laser Electron Photon Experiment at SPring-8

SPring-8 的激光电子光子实验

Measurement of the incoherent γd→φpn photoproduction near threshold

阈值附近非相干 γd→φpn 光产生的测量

• 发表时间: 2010
• 期刊: Phys.Lett.B 684
• 作者: 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.Ma
• 通讯作者: T.Ma