Test of QCD by means of the measurement of the pion scattering length

通过测量π介子散射长度来测试 QCD

• 批准号: 11440082
• 负责人: TAKEUTCHI Fujio
• 金额: $ 4.99万
• 依托单位: Kyoto Sangyo University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11440082/
• 关键词: DIRAC experiment; CERN PS212; Non-perturbative QCD; Scattering length of pion; hadronic atom; Kπ atom; Scifi hodoscope; Silicon microstrip counter; パイオニック原子; ハドロニック原子A_<2π>; π散乱長; 非摂動領域のQCD; カイラルパーターベーション; CERN PS実験; PS212; π^+π^-原始の寿命直接測定

The principal objective of this study is to carry out the PS212 experiment at CERN (DIRAC). The aim of the experiment is to find out the pi-pi scattering length by measuring the life-time of the A_<2π> atom, and compare it with the theoretical value precisely obtained from the QCD.The experiment was approved in 1996, and since then the Japanese group takes care of the fabrication and maintenance of the topological trigger device to pick up the specific pion pairs in the very intense beam. The data taking has started in 1999. Since then the data taking continues, and the expected statics will be achieved in the next year. The data analysis is also parallelly in progress, and we expect to publish the experimental result soon.In addition to the data-taking, improvement of the spectrometer in order to measure the K-pi scattering length is also studied.

本研究的主要目的是在CERN（DIRAC）进行PS212实验。该实验的目的是通过测量A_<2π>原子的寿命来确定π-π散射长度，并将其与QCD精确计算的理论值进行比较，该实验于1996年获得批准，此后日本研究小组负责了在超强光束中拾取特定π对的拓扑触发装置的制造和维护。1999年开始收集数据。从那时起，数据采集工作继续进行，预计明年将实现静态。数据分析也在进行中，我们希望能尽快公布实验结果。除了数据采集，我们还研究了改进光谱仪以测量K-pi散射长度。

项目成果

L. Afanasyev, et al.: "The multilevel trigger system of the DIRAC experiment"Nucl. Instrum. Meth.. A491. 376-389 (2002)

L. Afanasyev 等：“DIRAC 实验的多级触发系统”Nucl。

M. Kobayashi: "Test of low energy predictions of QCD from measurement of the lifetime of p^+p^--atoms (DIRAC experiment),Proc. Workshop on chiral dynamics in particle and nuclear physics. Dec."KEK. (1999)

M. Kobayashi：“通过测量 p^ p^--atoms 的寿命来测试 QCD 的低能预测（DIRAC 实验），Proc. 粒子和核物理手性动力学研讨会。12 月”KEK。

A.Gorin et al.: "SCINTILLATING FIBER HODOSCOPES FOR DIRAC AND COMPASS EXPERIMENTS"Czechoslovak Journal of Physics. 49Suppl. S2 (1999)

A.Gorin 等人：“狄拉克和罗盘实验的闪烁纤维视镜”捷克斯洛伐克物理学杂志。

A.Gorin et al.: "PRELIMINARY STUDY OF A TOPOLOGICAL TRIGGER DEVICE FOR COSMIC-RAY DETECTORS"Nucl.Instrum.Meth. A421. 60-68 (1999)

A.Gorin 等人：“宇宙射线探测器拓扑触发装置的初步研究”Nucl.Instrum.Meth。

A.Gorin et al.: "Peak-sensing discriminator for multichannel detectors with cross-talk"Nucl.Instrum.Meth.in Phys.Res.. A452. 280-288 (2000)

A.Gorin 等人：“带串扰的多通道检测器的峰值感应鉴别器”Nucl.Instrum.Meth.in Phys.Res.. A452。