在Bethe-Salpeter方程框架下研究DK分子态  

Analyzing the DK molecular state in the Bethe-Salpeter approach

作　　者：谢振兴[1] 

机构地区：[1]北京市东直门中学,北京100007

出　　处：《首都师范大学学报（自然科学版）》2012年第2期31-33,共3页Journal of Capital Normal University：Natural Science Edition

摘　　要：本文研究了BaBar合作组在分析正负电子湮灭的不变质量时发现的一个很窄的峰结构,该峰结构被命名为D*s0+(2317).首先假定它是S波的DK分子束缚态,利用Bethe-Salpeter方程研究了其结构并研究了其同位旋破缺衰变过程D*s0+(2317)→Ds+π0,同时在末态考虑了η-π0混合效应对衰变宽度的影响.研究结果表明,D*s0+(2317)可以具有DK的分子束缚态结构,而且η-π0混合效应对衰变宽度影响非常明显,D*s0+(2317)→Ds+π0衰变宽度的理论结果与实验结果相符.其它的理论模型也对D*s0+(2317)的结构和性质进行了研究,认为D*s0+(2317)可能存在其它形式的结构,并且得到的理论结果和实验结果相符.因此的结构存在多种形式,或者是几种结构的混合.该研究结果对未来的实验进一步确定D*s0(2317)的结构有指导意义.We analyze the state D0＋＋ （2317）,which was discovered as a very narrow peak by the Babar collaboration while analyzing the invariant mass distribution of the decay final state D＊s0＋. Assuming D＊s0＋ （2317） that is composed of DK, we use the Bethe-Salpeter equation to study the structure of D＊s0＋ （2317） and the isospin breaking decay process D＊s0＋（2317）→Ds＋π0. We also consider the→Ds＋π0 mixing effect in the decay. It is shown that D＊s0＋ ＋ （2317） can be formed as a molecular bound state of DK and the mixing effect has significant influence on the decay. The decay width in our model agrees with the resolution of the detector. Other theoretical models are aNo used to study the property and the structure of D＊s0＋ （2317）, assuming that D＊s0＋ （2317） may have other forms, and the results agree with the experimental data too. So the structure of may be other forms or the mixing of them. Our results will give important instructions to the forthcoming experiments.

关 键 词：BETHE-SALPETER方程 分子态 衰变宽度 

分 类 号：O572.25[理学—粒子物理与原子核物理]