核物质中五夸克重子态Θ^+的有效质量(英文)  

Effective Masses of PentaquarkΘ^+ in Nuclear Matter

作　　者：郭艳蕊[1] 李希国[1] 钟显辉[2] 刘紫玉[1] 靳根明[1] 

机构地区：[1]中国科学院近代物理研究所 [2]南开大学物理系,天津300071

出　　处：《高能物理与核物理》2007年第8期724-730,共7页High Energy Physics and Nuclear Physics

基　　金：中国科学院知识创新工程重点方向性项目(KJCX3-SYW-N2,KJCX2-SW-N16)国家科学自然基金(10435080,10575123)资助~~

摘　　要：在相对论平均场框架下,根据夸克介子耦合模型思想引入密度相关的标量耦合系数g_σ~N,计算了密度相关耦合系数下,核物质标量密度、五夸克重子态Θ+有效质量随核物质密度的变化情况,并与不变耦合系数下情况相比较.发现在低密度区域,密度相关的耦合系数对其影响很小,但在高密区域影响明显.表明,在密度相关的耦合系数影响下,标量介子与重子的相互作用在高密度区域被削弱.The properties of baryons in nuclear matter are analysed in the relativistic mean-field theory（RMF）.It is found that the scalar field σ meson affects the properties of baryon at high density.A density dependent scalar coupling gσ^Nis determined according to the idea of quark-meson coupling model and extended to RMF.It is shown that gσ^Naffects the property of nuclear matter weakly at low density,but strongly at high density.The relation between the scalar density ρs and the nuclear density ρand the effective mass of the pentaquark （θ）＋ are studied with the density dependent coupling constant.The density dependent scalar coupling obviously affects the effective masses of baryons in nuclear matter,especially at high density.

关 键 词：五夸克重子态(θ) + 密度相关耦合系数 有效质量 

分 类 号：O572.33[理学—粒子物理与原子核物理]