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Identifying the structure of near-threshold states from the line shape
Chen, GY; Huo, WS; Zhao Q(赵强); Zhao, Q
2015
发表期刊CHINESE PHYSICS C
卷号39期号:9页码:93101
通讯作者赵强
摘要We revisit the compositeness theorem proposed by Weinberg in an effective field theory (EFT) and explore criteria which are sensitive to the structure of S-wave threshold states. On a general basis, we show that the wave function renormalization constant Z, which is the probability of finding an elementary component in the wave function of a threshold state, can be explicitly introduced in the description of the threshold state. As an application of this EFT method, we describe the near-threshold line shape of the D*(0)(D) over bar (0) invariant mass spectrum in B -> D*(0)(D) over bar K-0 and determine a nonvanishing value of Z. It suggests that the X(3872) as a candidate of the D*(0)(D) over bar (0) molecule may still contain a small c (c) over bar core. This elementary component, on the one hand, explains its production in the B meson decay via a short-distance mechanism, and on the other hand, is correlated with the D*(0)(D) over bar (0) threshold enhancement observed in the D*(0)(D) over bar (0) invariant mass distributions. Meanwhile, we also show that if Z is non-zero, the near-threshold enhancement of the D*(0)(D) over bar (0) mass spectrum in the B decay will be driven by the short-distance production mechanism.
文章类型Article
关键词X(3872) effective field theory compositeness
学科领域Physics
DOI10.1088/1674-1137/39/9/093101
收录类别SCI
WOS类目Physics, Nuclear ; Physics, Particles & Fields
WOS记录号WOS:000361416700002
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被引频次:8[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228706
专题理论物理室
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Chen, GY,Huo, WS,Zhao Q,et al. Identifying the structure of near-threshold states from the line shape[J]. CHINESE PHYSICS C,2015,39(9):93101.
APA Chen, GY,Huo, WS,赵强,&Zhao, Q.(2015).Identifying the structure of near-threshold states from the line shape.CHINESE PHYSICS C,39(9),93101.
MLA Chen, GY,et al."Identifying the structure of near-threshold states from the line shape".CHINESE PHYSICS C 39.9(2015):93101.
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