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题名: Identifying the structure of near-threshold states from the line shape
作者: Chen, GY;  Huo, WS;  Zhao, Q
刊名: CHINESE PHYSICS C
出版日期: 2015
卷号: 39, 期号:9, 页码:93101
关键词: X(3872) ;  effective field theory ;  compositeness
学科分类: Physics
DOI: http://dx.doi.org/10.1088/1674-1137/39/9/093101
通讯作者: Chen, GY (reprint author), Xinjiang Univ, Dept Phys, Urumqi 830046, Peoples R China.
文章类型: Article
英文摘要: 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.
类目[WOS]: Physics, Nuclear ;  Physics, Particles & Fields
关键词[WOS]: COMPOSITE-PARTICLES ;  X(3872) ;  DECAYS
收录类别: SCI
项目资助者: National Natural Science Foundation of China [11147022, 11035006, 11305137] ;  Chinese Academy of Sciences [KJCX2-EW-N01] ;  Ministry of Science and Technology of China [2009CB825200] ;  DFG ;  NSFC [11261130311, CRC 110] ;  Doctor Foundation of Xinjiang University [BS110104]
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/20881
Appears in Collections:理论物理所2015年知识产出_期刊论文

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Recommended Citation:
Chen, GY,Huo, WS,Zhao, Q. Identifying the structure of near-threshold states from the line shape[J]. CHINESE PHYSICS C,2015,39(9):93101.
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