Study for nuclear media effect on chiral symmetry restoration
核介质对手性对称性恢复的影响研究
基本信息
- 批准号:12440064
- 负责人:
- 金额:$ 3.14万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:2000
- 资助国家:日本
- 起止时间:2000 至 2002
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
It is believed that chiral symmetry, which is spontaneously broken in our world, should be restored in a system with a finite temperature and/or a finite density. Theoretically, it has been suggested that a signature of the chiral symmetry restoration could be seen as a possible mass shift of vector mesons in nuclear matter.This research project has aimed the mass of ρ, ω and φ mesons produced, and decays in nuclei, through a determination of the invariant mass from the e^+e^- pairs, or the K^+K^- pairs following their decays. The experiment was successful to observe ω and φ mesons in the e^+e^- invariant mass spectra, and reported the signature of an in-medium mass modification of the mesons. This was the first observation in the leptonic in-medium decay of vector mesons at a normal nuclear matter density. The experiment finished the data taking in March 2002, and the statistics is improved by factor 100 compared to the previous publication and the preliminary data have been reported in international conferences. In another half year, we expect to reach the final results.
人们认为,在有限温度和/或有限密度的系统中,手征对称性应该被恢复,这种对称性在我们的世界中是自发破坏的。从理论上讲,手征对称性恢复的特征可以看作是核物质中矢量介子的一种可能的质量漂移。本研究项目旨在通过确定e^+e^-对或衰变后的K^+K^-对的不变质量,来确定产生的ρ,ω和φ介子在原子核中衰变的质量。实验成功地在e^+e^不变质量谱中观测到了ω和φ介子,并报道了介子在介质中质量修正的特征。这是第一次在正常核物质密度下观察到矢量介子的轻子介质中衰变。本实验于2002年3月完成数据采集,统计结果较之前发表的数据提高了100倍,初步数据已在国际会议上发表。再过半年,我们期待着最终的结果。
项目成果
期刊论文数量(48)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
M.Ishino et al.: "MASS PRODUCTION OF HYDROPHOBIC SILICA AEROGEL AND READOUT OPTICS OF CERENKOV LIGHT"Nuclear Instruments and Methods. A457. 581-587 (2001)
M.Ishino 等人:“疏水二氧化硅气凝胶的大规模生产和切伦科夫光的读出光学器件”核仪器和方法。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
S.Yokkaichi et al.KEK-PS-E325 Collaboration: "MEASUREMENTS OF PHI MESON DECAYS IN NUCLEAR MATTER AT KEK-PS."Nucl.Phys.. A638. 435-438 (1998)
S.Yokkaichi 等人 KEK-PS-E325 合作:“KEK-PS 核物质中 PHI 介子衰变的测量”Nucl.Phys.. A638。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
M. Naruki et al: "Measurement of Invariant Mass Spectra of Vector Meson Decaying in Nuclear Matter"Nuclear Physics. (in press). (2003)
M. Naruki 等人:“核物质中矢量介子衰变的不变质谱的测量”核物理。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
K. Ozawa et al: "MODIFICATION OF VECTOR MESONS IN NUCLEAR MATTER MEASURED IN 12-GEV P+A REACTIONS AT KEK-PS"Nuclear Physics. A695. 535-538 (2002)
K. Ozawa 等人:“在 KEK-PS 的 12-GEV P A 反应中测量的核物质中矢量介子的修改”核物理。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
M.Naruki et al.: "Measurement of Invariant Mass Spectra of Vector Meson Decaying in Nuclear Matter"Nuclear Physics. (in press). (2003)
M.Naruki 等人:“核物质中矢量介子衰变的不变质谱的测量”核物理。
- DOI:
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- 期刊:
- 影响因子:0
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{{ truncateString('EN'YO Hideto', 18)}}的其他基金
Study of chiral property of nuclear matter based on the dispersion of vector meson.
基于矢量介子色散的核物质手性性质研究
- 批准号:
15340089 - 财政年份:2003
- 资助金额:
$ 3.14万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Measurements of φdecay in nuclear matter
核物质中 φ 衰变的测量
- 批准号:
08404013 - 财政年份:1996
- 资助金额:
$ 3.14万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
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