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Search for Exotic Mesons with High Precision Gamma-ray Detector (GAMS)

使用高精度伽马射线探测器 (GAMS) 寻找奇异介子

基本信息

批准号：
10044100
负责人：
TSURU Tsuneaki
金额：
$ 9.6万
依托单位：
High Energy Accelerator Research Organization
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

Experiments of search for non-qq exotic mesons (glueballs, hybrids etc.) and new chiral symmetry particles (sigma etc.) were performed using 450GeV Super Proton Synchrotron at CERN and 70GeV Proton Synchrotron at IHEP (Russia) in relation with experiments at 12GeV Proton Synchrotron at KEK, and the obtained data were analyzed at each institute. R＆D works of detectors and front end electronics were also done in the framework of the GAMS collaboration.At CERN, central production reactions pp→p_sX^0p_f (X^0=π^+ π^-, π^0π^0, η η etc.) were studied and at IHEP and KEK, charge exchange reactions π^-p→X^0n X^-p (X^0= η π^0 etc.X^-=η π^- etc) are mainly persued.A primary scalar glueball candidate f_0(1500)/G1590) which was found firstly by our GAMS group in 1983, was confirmed in relevant channels (η η, η η' etc.) by the new analyses of CERN and IHEP dataA non-qq 1^<-+> state in the η π^- channel found at KEK was confirmed by other two group (MPS at BNL and VES at IHEP).Many resonances in many … More decay channels were studied by our WA102 group using the OMEGA spectrometer with detection capability of charged particles and gammas and particle identification.The sigma meson, a chiral partner of π as a Goldstone boson, was studied with collaboration with the theoretical group of Nihon University. This meson was seen around the 500 MeV mass region in π^0π^0 channel of many production reactions (pp central collision, J/φ decay, D decay etc.). The difficult problems in the scattering process, which had not been solved for 20 years, was studied and solved on new ideas of several groups and the new method of Nihon-Univ.group.A prototype of a new electromagnetic calorimeter hodoscope using new material, lead tungstate (PWO) was built and successfully tested. A new full-custom IC chips for ADC with high speed (less than 1 μ sec.) and high linearity resolution (more than 10bits) was developed successfully with the best level in the world.These works were performed on the basis on agreement on collaboration between KEK and IHEP.The agreement is continued till October of 2005. Less

利用欧洲核子研究中心的450GeV超级质子同步加速器和俄罗斯IHEP的70GeV质子同步加速器，结合KEK的12GeV质子同步加速器的实验，进行了寻找非qq外来介子（胶球、杂子等）和新的手性对称粒子（sigma等）的实验，并在各研究所进行了数据分析。探测器和前端电子器件的研发工作也在GAMS合作框架下完成。在CERN研究了中心生成反应pp→p_sX^0p_f （X^0=π^+ π^-、π^0π^0、η η等），在IHEP和KEK主要研究了电荷交换反应π^-p→X^0n X^-p （X^0= η π^0等，X^-=η π^-等）。我们的GAMS小组在1983年首次发现了一个初级标量胶球候选者f_0(1500)/G1590)，通过对CERN和IHEP数据的新分析，在相关通道（η η, η η'等）中得到了证实。另外两个小组（BNL的MPS和IHEP的VES）也证实了在KEK发现的η π^-通道中的非qq 1 <-+>状态。我们的WA102小组利用具有带电粒子探测能力的OMEGA光谱仪，研究了更多的衰变通道中的许多共振和伽马和粒子识别。sigma介子是π的手性伙伴，作为戈德斯通玻色子，与日本大学理论小组合作研究。在许多产生反应（pp中心碰撞、J/φ衰变、D衰变等）的π^0π^0通道中，在500 MeV质量区域附近都可以看到这个介子。利用几个小组的新思想和nihon - univ小组的新方法，研究和解决了散射过程中20年未解决的难题。采用钨酸铅（ppo）材料制作了一种新型电磁量热镜样机，并进行了成功的测试。成功开发出高速（小于1 μ sec）、高线性度分辨率（大于10位）的新型ADC全定制集成电路芯片，具有国际最佳水平。这些工作是根据KEK和IHEP之间的合作协议进行的。该协议将持续到2005年10月。少