Evidence for a new resonance Σ~* (1380) with J^P=1/2^(-*)  

作　　者：吴佳俊 S.Dulat 邹冰松 

机构地区：[1]Institute of High Energy Physics,CAS [2]School of Physics Science and Technology,Xinjiang University [3]Theoretical Physics Center for Science Facilities,CAS

出　　处：《Chinese Physics C》2010年第9期1508-1511,共4页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10875133,10821063,10665001,10635080);Chinese Academy of Sciences Knowledge Innovation Project (KJCX3-SYW-N2);Ministry of Science and Technology of China (2009CB825200)

摘　　要：A new particle Σ^ ＊ with J ^P = 1/2^-was predicted by unquenched quark models with its mass around the well established Σ ＊ （1385） with J P = 3/2 ＋ .Here we re-examine some old data of the K^-p → Λπ^-π^ ＋ reaction.Firstly we re-fit the data for kaon beam momenta in the range of 1.0 - 1.8 GeV.Secondly we study the reaction at the energies around Λ＊（1520） peak.Both studies show evidence for the existence of Σ＊with J^ P = 1/2^-around 1380 MeV.Higher statistic data on relevant reactions are needed to clarify the situation.A new particle Σ^ ＊ with J ^P = 1/2^-was predicted by unquenched quark models with its mass around the well established Σ ＊ （1385） with J P = 3/2 ＋ .Here we re-examine some old data of the K^-p → Λπ^-π^ ＋ reaction.Firstly we re-fit the data for kaon beam momenta in the range of 1.0 - 1.8 GeV.Secondly we study the reaction at the energies around Λ＊（1520） peak.Both studies show evidence for the existence of Σ＊with J^ P = 1/2^-around 1380 MeV.Higher statistic data on relevant reactions are needed to clarify the situation.

关 键 词：Σ ^＊ unquenched quark model K^-p → Λπ^-π^ ＋ reaction 

分 类 号：O572.33[理学—粒子物理与原子核物理]