Identifying the structure of near-threshold states from the line shape

	Identifying the structure of near-threshold states from the line shape
	Chen, GY; Huo, WS; Zhao Q(赵强); Zhao, Q
刊名	CHINESE PHYSICS C
	2015
卷号	39 期号:9 页码:93101
关键词	X(3872) effective field theory compositeness
通讯作者	赵强
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.
学科主题	Physics
类目[WOS]	Physics, Nuclear ; Physics, Particles & Fields
收录类别	SCI
WOS记录号	WOS:000361416700002
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/228706]
专题	高能物理研究所_理论物理室
推荐引用方式 GB/T 7714	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.