The unquenched quark model for the light quarkonium and charmonium states is explored in this study.The quark-pair creation operator in the^(3)P_(0) model,which combines the two-quark and four-quark components,is modi...The unquenched quark model for the light quarkonium and charmonium states is explored in this study.The quark-pair creation operator in the^(3)P_(0) model,which combines the two-quark and four-quark components,is modified by considering the effects of the created quark pair's energy.Furthermore,the separation between the created quark pair and valence quark pair is modified.All the wave functions,including those for the mesons and the relative motion between two mesons,are obtained by solving the corresponding Schrodinger equation using the Gaussian expansion method.The aim of this study is to find a new set of parameters that can accurately describe the mass spectrum of low-lying light quarkonium and charmonium states.Moreover,certain exotic states,such as X(3872),can be described well in the unquenched quark model.展开更多
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 the National Natural Science Foundation of China(12205125,11847145,12205249,11865019)the Natural Science Foundation of Jiangsu Province,China(BK20221166)。
文摘The unquenched quark model for the light quarkonium and charmonium states is explored in this study.The quark-pair creation operator in the^(3)P_(0) model,which combines the two-quark and four-quark components,is modified by considering the effects of the created quark pair's energy.Furthermore,the separation between the created quark pair and valence quark pair is modified.All the wave functions,including those for the mesons and the relative motion between two mesons,are obtained by solving the corresponding Schrodinger equation using the Gaussian expansion method.The aim of this study is to find a new set of parameters that can accurately describe the mass spectrum of low-lying light quarkonium and charmonium states.Moreover,certain exotic states,such as X(3872),can be described well in the unquenched quark model.
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.
