A search for ? meson nucleus bound state using antiproton annihilation on nucleus

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• 作者：H. Ohnishi (1)
  P. Bühler (2)
  M. Cargnelli (2)
  C. Curceanu (3)
  C. Guaraldo (3)
  O. Hartmann (2)
  K. Hicks (4)
  M. Iwasaki (1)
  T. Ishiwatari (2)
  P. Kienle (5)
  J. Marton (2)
  R. Muto (6)
  M. Naruki (6)
  M. Niiyama (7)
  H. Noumi (8)
  S. Okada (3)
  A. Romero Vidal (3)
  A. Sakaguchi (9)
  F. Sakuma (1)
  S. Sawada (6)
  D. Sirghi (3)
  F. Sirghi (3)
  K. Suzuki (2)
  K. Tsukada (10)
  O. Vazquez Doce (3)
  E. Widmann (2)
  S. Yokkaichi (1)
  J. Zmeskal (2)
  
• 关键词：Double ? meson production ; ? ; N bound state
• 刊名：Hyperfine Interactions
• 出版年：2012
• 出版时间：3 - December 2012
• 年：2012
• 卷：213
• 期：1
• 页码：23-29
• 全文大小：350KB
• 参考文献：1. Muto, R., et al.: Phys. Rev. Lett. 98, 042501 (2007) CrossRef
  2. Ishikawa, T., et al.: Phys. Lett. B 608, 215 (2005) CrossRef
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  4. Polyansky, A., et al.: Phys. Lett. B 695, 74 (2011) CrossRef
  5. Yokkaichi, S., et al.: J-PARC E16 proposal. http://j-parc.jp/NuclPart/pac_0606/pdf/p16-Yokkaichi_2.pdf
  6. Waas, T., Rho, M., Weise, W.: Nucl. Phys. A 617, 449 (1997) CrossRef
  7. Yamagata-Sekihara, J., et al.: Prog. Theor. Phys. 124, 147 (2010) CrossRef
  8. Ohnishi, H., et al.: J-PARC E29 proposal. http://j-parc.jp/NuclPart/pac_0907/pdf/Ohnishi.pdf
  9. Evangelista, C., et al.: Phys. Rev. D 57, 5370 (1996) CrossRef
  10. Oset, E., et al.: Acta Phys. Hung. A 27, 115 (2006) CrossRef
  
• 作者单位：H. Ohnishi (1)
  P. Bühler (2)
  M. Cargnelli (2)
  C. Curceanu (3)
  C. Guaraldo (3)
  O. Hartmann (2)
  K. Hicks (4)
  M. Iwasaki (1)
  T. Ishiwatari (2)
  P. Kienle (5)
  J. Marton (2)
  R. Muto (6)
  M. Naruki (6)
  M. Niiyama (7)
  H. Noumi (8)
  S. Okada (3)
  A. Romero Vidal (3)
  A. Sakaguchi (9)
  F. Sakuma (1)
  S. Sawada (6)
  D. Sirghi (3)
  F. Sirghi (3)
  K. Suzuki (2)
  K. Tsukada (10)
  O. Vazquez Doce (3)
  E. Widmann (2)
  S. Yokkaichi (1)
  J. Zmeskal (2)
  
  1. RIKEN Nishina Center, RIKEN, Saitama, 351-0198, Japan
  2. Stefan-Meyer-Institut fNur subatomare Physik, 1090, Vienna, Austria
  3. Laboratori Nazionali di Frascati dellf INFN, 00044, Frascati, Italy
  4. Department of Physics and Astronomy, Ohio University, Athens, OH, USA
  5. Technische Universiat Munchen, 85748, Garching, Germany
  6. KEK (High Energy Accelerator Research Organization), Tsukuba, Japan
  7. Department of Physics, Kyoto University, Kyoto, Japan
  8. Research Center for Nuclear Physics, Osaka University, Osaka, Japan
  9. Department of Physics, Osaka University, Osaka, Japan
  10. Department of Physics, Tohoku University, Sendai, Japan
  
• ISSN：1572-9540

文摘

The mass shift of the vector mesons in nuclei is known to be a powerful tool for investigating the mechanism of generating hadron mass from the QCD vacuum. The mechanism is known to be the spontaneous breaking of chiral symmetry. In 2007, KEK-PS E325 experiment reported about 3.4?% mass reduction of the ? meson in medium-heavy nuclei (Cu). This result is possibly one of the indications of the partial restoration of chiral symmetry in nuclei, however, unfortunately it is hard to make strong conclusions from the data. One of the ways to conclude the strength of the ? meson mass shift in nuclei will be by trying to produce only slowly moving ? mesons where the maximum nuclear matter effect can be probed. The observed mass reduction of the ? meson in the nucleus can be translated as the existence of an attractive force between ? meson and nucleus. Thus, one of the extreme conditions that can be achieved in the laboratory is indeed the formation of a ?-nucleus bound state, where the ? meson is “trapped-in the nucleus. The purpose of the experiment is to search for a ?-nucleus bound state and measure the binding energy of the system. We will demonstrate that a completely background-free missing-mass spectrum can be obtained efficiently by $(\bar{p}, \phi)$ spectroscopy together with K --/sup>Λ tagging, using the primary reaction channel $\bar{p} p \rightarrow \phi \phi$ . This paper gives an overview of the physics motivation and the detector concept, and explains the direction of the initial research and development effort.