Search for non qq mesons-GAMS Collaboration

搜索非QQ介子-GAMS协作

• 批准号: 07044098
• 负责人: TSURU Tsuneaki
• 金额: $ 13.5万
• 依托单位: National Laboratory for High Energy Physics
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07044098/
• 关键词: Meson Spectroscopy; Exotir Mesons; Glueball; Hybrid; QCD; Non qq meson; sigma particle; non-perturbatire; quark model; 中間子分光学; エキゾティック中間子; グル-ボール; ハイブリッド; 量子色力学; 非フォーク対中間子; シグマ粒子; 非摂動論; 多重クォーク中間子; 非クォーク対中間子; クォークモデル

The GAMS international collaboration consists of two independent experiments at CERN and IHEP (Protvino, Russia). At CERN,the WA91/102 experiments with the GAMS4000 spectrometer combined to the OMEGA one were performed using the 450GeV SPS,and at IHEP the SERP-172 experiment with Gams-4pi spectrometer was done using the 70 GeV PS.Both experiments aim at searching for new meson states including exotic non-qq states. The process pp->ppX of central pp collisions is mainly studied at CERN and that of charge exchange reactions pi p->Xn with X-> multi-photons is at IHEP.Data taking runs were performed from May to July, 1995 and 1996 at CERN,and was done from November to December, 1996 at IHEP.Japanese collaborators visited CERN and IHEP to join the data taking run. They also visited there to proceed the analysis and R&D works when it was necessary.In the frame of GAMS collabration, physicists of CERN and IHEP visited KEK to discuss about the data analysis, publication of papers and also abou … More t the next plan of the collaboration.Many physics outputs were issued. pi^0 pi^0 and eta pi^0 systems were studied in the pp central collisions reaction. omega pi and eta pi pi systems were studied in the charge exchange reaction. In particulary a bump of low mass region (500-800 MeV) in the pi^0 pi^0 mass distribution was studied carefully and it was shown that it has characteristics of an isoscalar scalar state. The new data of WA91/102 was analyzed and published in the journals. Many papers were submitted to the HADRON 95 international conference at Manchester, in July 1995. The possibility of whether the scalar low mass bump of pi^0 pi^0 system could be regarded as a long awaited sigma particle was studied in collaboration with Nihon University.On the other hand, the detector R&Ds are also done successfully. A new calorimeter using heavy crystal of PWO (PbWO4) was studied at KEK,IHEP and LAPP.The result of test of a prototype PWO hodoscope at KEK was published. The new material PWO is enough good for the next high intensity experiment (COMPASS). High speed, high resolution (QVC and ADC were developed for the new electromagnetic calorimeter.New proposal COMPASS (COmmon Muon Proton Apparatus for Structure and Spectroscopy) was approved by CERN.The GAMS collaboration agreement between KEK and IHEP was prolonged for another 5 years in October, 1995. Less

GAMS国际合作包括在CERN和IHEP（俄罗斯Protvino）进行的两项独立实验。CERN的WA 91/102实验和IHEP的SERP-172实验都是为了寻找新的介子态，包括奇异的非qq态。WA 91/102实验是用450 GeV的Gams-4pi谱仪和OMEGA谱仪进行的，而SERP-172实验是用70 GeV的Gams-4pi谱仪进行的。CERN主要研究中心pp碰撞过程pp->ppX，IHEP主要研究电荷交换反应pi p->Xn与X->多光子的过程，CERN于1995年5月至7月和1996年5月至7月进行了数据采集，IHEP于1996年11月至12月进行了数据采集，日本合作者访问CERN和IHEP参加了数据采集。在GAMS合作框架内，CERN和IHEP的物理学家访问KEK，讨论数据分析、论文发表以及有关GAMS的研究和开发工作。 ...更多信息 t的合作的下一个计划。许多物理输出发表。研究了pp中心碰撞反应中的pi^0 pi^0和eta pi^0体系。在电荷交换反应中研究了ω π和η π π体系。特别是对π ^0 π ^0质量分布中的低质量区（500-800 MeV）的一个凸起进行了仔细的研究，发现它具有等压线标量态的特征。对WA 91/102的新资料进行了分析并发表在期刊上。许多文件提交给HADRON 95国际会议在曼彻斯特，在1995年7月。与日本大学合作研究了π ^0 π ^0系统的标量低质量凸点是否可以被视为期待已久的σ粒子的可能性，另一方面，探测器的研发也取得了成功。在KEK、IHEP和LAPP研究了一种新的PWO（PbWO_4）重晶体量热计，并发表了在KEK研制的PWO速迹仪样机的测试结果。新材料PWO对于下一个高强度实验（COMPASS）来说足够好。1995年10月，KEK与IHEP的GAMS合作协议又延长了5年，并于1995年10月获得了欧洲核子研究中心（CERN）的批准。少

项目成果

D.Barberis et al. (WA91 Collaboration): "Observation of Vertex Factorization Breaking in Central pp Interactions." Physics Lettes B. 388. 853- (1996)

D.巴伯里斯等人。

K.Takamatsu: "Recent Results of Meson Spectroscopy Studies at KEK" Proc.of International Workshop on Hardron Physics at e^+e^- Colliders and Related at Beijing. 28-35 (1995)

K.Takamatsu：“KEK 介子光谱研究的最新结果”Proc.of 国际硬子物理研讨会，e^ e^- 北京对撞机及相关机构。

S.Ishida et al.: "Possibility of a_0 (980) and f_0 (975) as hybrid mesons with a massive constituent gluon" KEK-Preprint 95-167,NUP-A-95-15,to be published in Proc.of 6th lntern.Conf.on Hadron Spectroscopy,July 10-15,Manchester,UK.(1996)

S.Ishida 等人：“a_0 (980) 和 f_0 (975) 作为具有大量组成胶子的混合介子的可能性”KEK-Preprint 95-167,NUP-A-95-15，将在 Proc.of 上发表

S.Ishida et al.: "An analysis of π π-scattering phase shift and existence of σ (555) particle" KEK-Preprint 95-183,NUP-A-95-183,to be published in Progess of Theoretical Physics. 95. #4 (1996)

S. Ishida 等人：“对 π π 散射相移和 σ (555) 粒子存在的分析”KEK-Preprint 95-183、NUP-A-95-183，将发表在《理论物理学进展》上。 95.4（1996）

T.Tsuru et al. (28): "Partial Wave Analysis of the eta pi^0 pi^0 System." Proc.of International Workshop on Hadron Physics at e^+e^- Colliders and Related at Beijing. 34-37 (1995)

T.Tsuru 等人。