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^ ＋ ...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.展开更多
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)
文摘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.
