Experimental study of the mass-generation mechanism due to the chiral symmetry breaking

2013 Fiscal Year Final Research Report

• Project Area: Quest on new hadrons with variety of flavors
• Project/Area Number: 21105004
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: The Institute of Physical and Chemical Research
• Principal Investigator: EN'YO Hideto 独立行政法人理化学研究所, 仁科加速器研究センター, 主任研究員 (30213606)
• Co-Investigator(Kenkyū-buntansha): YOKKAICHI Satoshi 理化学研究所, 仁科加速器研究センター, 専任研究員 (20360670) ; OZAWA Kyoichiro 高エネルギー加速器研究機構, 素粒子原子核研究所, 准教授 (20323496) ; MUTO Ryotaro 高エネルギー加速器研究機構, 素粒子原子核研究所, 助教 (50392147)
• Co-Investigator(Renkei-kenkyūsha): SAKUMA Fuminori 理化学研究所, 仁科加速器研究センター, 専任研究員 (10455347) ; KIYOMICHI Akio 高輝度光科学研究センター, 制御・情報部門, 研究員 (60373297)
• Project Period (FY): 2009-07-23 – 2014-03-31
• Keywords: 実験核物理 / 放射線X線粒子線 / GEM / チェレンコフ光検出器 / 飛跡検出器 / 電子検出器 / カイラル対称性 / 量子色力学

Research Abstract

The mass generation mechanism of hadrons due to the spontaneous breaking of chiral symmetry in QCD, which is proposed by Nambu, are widely accepted. In order to verify this idea experimentally, we will measure the mass modification of vector mesons in nuclei systematically with the best mass-resolution and statistics in the world. We have developed and made detectors using GEM, namely,
GEM Tracker and Hadron-blind Cherenkov detector, to perform a new experiment E16 at J-PARC Hadron experimental facility. The first beam will be delivered in 2016.

Research Products

• [Journal Article] Experimental Investigation for Mass Modification of Vector Mesons at J-PARC (2014)
  • Author(s): Daisuke Kawama, Kazuya Aoki, Yoki Aramaki, Hideto En'yo, Hideki Hamagaki, Junpei Kanaya, Koki Kanno, Akio Kiyomichi, Yusuke Komatsu, Shinichi Masumoto, Yuhei Morino, Hikari Murakami, Ryotaro Muto, Wataru Nakai, Megumi Naruki, Yuki Obara, Kyoichiro Ozawa, Fuminori Sakuma, Shin'ya Sawada, Michiko Sekimoto, Takuya Shibukawa, Kenta Shigaki, Tomonori Takahashi, Yosuke Watanabe, Satoshi Yokkaichi
  • Journal Title: JPS Conf. Proc Volume: 1 Pages: 013074
  • Peer Reviewed
• [Journal Article] Experimental Investigation for Mass Modification Effect in Nuclei at J-PARC (2014)
  • Author(s): Daisuke Kawama, Kazuya Aoki, Yoki Aramaki, Hideto En'yo, Hideki Hamagaki, Junpei Kanaya, Koki Kanno, Akio Kiyomichi, Yusuke Komatsu, Shinichi Masumoto, Yuhei Morino, Hikari Murakami, Ryotaro Muto, Wataru Nakai, Megumi Naruki, Yuki Obara, Kyoichiro Ozawa, Fuminori Sakuma, Shin'ya Sawada, Michiko Sekimoto, Takuya Shibukawa, Kenta Shigaki, Tomonori Takahashi, Yosuke Watanabe, Satoshi Yokkaichi
  • Journal Title: PoS(Hadron 2013) Volume: 178
• [Journal Article] A Development of the GEM tracker for the J-PARC E16 experiment (2013)
  • Author(s): Yusuke Komatsu, Kazuya Aoki, Yoki Aramaki, Hideto En'yo, Koki Kanno, Daisuke Kawama, Shinichi Masumoto, Wataru Nakai, Yuki Obara, Kyoichiro Ozawa, Michiko Sekimoto, Takuya Shibukawa, Tomonori Takahashi, Yosuke Watanabe, Satoshi Yokkaichi
  • Journal Title: Nuclear Instruments and Methods in Physics Research Volume: A 732 Pages: 241-244
  • Peer Reviewed
• [Journal Article] A development of HBD for the J-PARC E16 experiment (2011)
  • Author(s): K. Aoki, H. En'yo, T. Gunji, H. Hamagaki, J.Kanaya, Y.Komatsu, S.Masumoto, K.Ozawa, T.Sato, M.Sekimoto, T.Tsuji, K.Utsunomiya, Y.S.Watanabe, S.Yokkaichi
  • Journal Title: Nuclear Instruments and Methods in Physics Research Volume: A 628 Pages: 300-303
  • Peer Reviewed
• [Presentation] Experimental studies on medium modification of vector mesons (2014)
  • Author(s): M.Naruki
  • Organizer: Hirschegg 2014: Hadrons from Quarks and Gluons (International Workshop XLII on Gross Properties of Nuclei and Nuclear Excitations)
  • Place of Presentation: Hirschegg, Kleinwalsertal, Austria
  • Year and Date: 20140112-18
• [Presentation] Experimental studies on medium modification of hadron mass (2013)
  • Author(s): M.Naruki
  • Organizer: Hadron 2013
  • Place of Presentation: Nara, Japan
  • Year and Date: 20131104-08
• [Presentation] Experimental Investigation for Mass Modification Effect in Nuclei (2013)
  • Author(s): D. Kawama
  • Organizer: Hadron 2013
  • Place of Presentation: Nara, Japan
  • Year and Date: 20131104-08
• [Presentation] Development of the Hadron Blind Detector for the J-PARC E16 experiment (2013)
  • Author(s): K.Kanno
  • Organizer: IEEE NUCLEAR SCIENCE SYMPOSIUM 2013
  • Place of Presentation: Seoul, Korea
  • Year and Date: 20131027-1102
• [Presentation] "高運動量ビームラインと核物質中でのハドロン質量の変化" (シンポジウム J-PARC 高運動量ビームラインのハドロン物理) (2013)
  • Author(s): 小沢恭一郎
  • Organizer: 日本物理学会 2013年秋季大会
  • Place of Presentation: 高知大学(高知市)
  • Year and Date: 2013-09-20
• [Presentation] Mass modification of vector mesons (2012)
  • Author(s): Kazuya Aoki
  • Organizer: New Hadron Spectroscopies/Dynamics
  • Place of Presentation: Pusan, Korea
  • Year and Date: 2012-11-21
• [Presentation] "核物質中での質量の変化とQCD での質量獲得機構" (シンポジウムJ-PARC ハドロン施設の近未来) (2012)
  • Author(s): 四日市 悟
  • Organizer: 日本物理学会 2012年秋季大会
  • Place of Presentation: 京都産業大学(京都市)
  • Year and Date: 2012-09-13
• [Presentation] Measurements of meson mass at J-PARC (2011)
  • Author(s): Kyoichiro Ozawa
  • Organizer: Zimanyi 2011 winter school on Heavy Ion Physics
  • Place of Presentation: MTA KFKI RMKI (Hungary)
  • Year and Date: 2011-11-30
• [Presentation] Vector meson measurements through dielectron: planned experiment at J-PARC (2010)
  • Author(s): Satoshi Yokkaichi
  • Organizer: Workshop "Electromagnetic Probes of Strongly Interacting Matter: Status and Future of Low-Mass Lepton-Pair Spectroscopy"
  • Place of Presentation: ECT* (Trento, Italy)
  • Year and Date: 2010-09-17
• [Presentation] Vector meson in nuclear medium, experiments at KEK and J-PARC (2010)
  • Author(s): Satoshi Yokkaichi
  • Organizer: NFQCD 2010 Symposium of 'Exotic Hadron' and 'Hadrons in Nuclei'
  • Place of Presentation: YITP, Kyoto
  • Year and Date: 2010-02-18
• [Presentation] Development of GEM detectors for a large acceptance phimeson spectrometer (2009)
  • Author(s): Yosuke Watanabe
  • Organizer: Hawaii 2009 3rd joint meeting of the nuclear physics divisions of the JPS and APS
  • Place of Presentation: Hawaii's Big Island, U.S.A.
  • Year and Date: 2009-10-15
• [Presentation] Measurement of vector meson mass in nuclear medium using p + A (2009)
  • Author(s): Ryotaro Muto
  • Organizer: US-Japan Joint Workshop on Meson Production Reactions at Jefferson Lab and J-PARC
  • Place of Presentation: Hawaii's Big Island, U.S.A.
  • Year and Date: 2009-10-12
• [Book] "In-medium mass modification of vector mesons", Lecture notes in physics 781 (Particle and nuclear physics at J-PARC) (2009)
  • Author(s): Satoshi Yokkaichi
  • Total Pages: 161-193
  • Publisher: Springer
• [Remarks] アウトリーチ活動 方位磁石を用いた「対称性の自発的破れ」の演示模型(図9)を製作し(2011)、J-PARCE16 実験ポスターとともに展示、説明した。図9「対称性の自発的破れ」の演示模型: 外乱を与えたあと緩和を待つと磁区構造ができる(左上)。 (1)理化学研究所一般公開
• [Remarks] 延與 秀人, 「私たちはなぜ重いか -宇宙誕生・天地創造・万物創生、ヒッグス粒子から超重元素まで -」 ONSA 25 周年記念講演会, 2014/1/27、 大阪大学中之島センター(大阪市) (2)一般むけ講演
• [Remarks] 延與 秀人, 「私たちはなぜ重いのかーヒッグス粒子から超重元素までー」, 知的刺激週間スペシャル講演会、 2012/10/29、西武学園文理中学・高等学校 (埼玉県 狭山市)延與 秀人, 「宇宙誕生 100 万分の1 秒後の謎」, 埼玉県民の日 特別講演2011/11/14, 埼玉県立総合教育センター(埼玉県 行田市) (2)一般むけ講演
• [Remarks] 新学術領域「新ハドロン」ホームページ
  • URL: http://www.hepl.phys.nagoya-u.ac.jp/public/new_hadron/index.html