在手征么正模型中0^+重介子是否存在分子态结构(英文)

D_o Non-strange 0^+ Heavy Mesons Have Molecular Structure in the Heavy Chiral Unitary Approach

在分子态结构的假设下,利用手征么正模型研究了D_0~*(2308)和B_0~*的可能结构.通过研究重子-赝标介子相互作用,找到了一些可能的分子态.结果表明:在带奇异数的系统中,存在一个质量为2.312±0.041GeV的DK束缚态,它可以被解释为实验上发现的D_(s0)~*(2317).与此同时,在非奇异系统中,存在一个与之对应的、质量为2.1GeV的宽度较大的态和一个对应的、质量为2A4GeV的宽度较小的态.这两个态应对应于D:.因此,分子态结构只能是D_0~*(2308)一个分量.计算结果还预言了一些B_(s0)~*和B_0~*态.其中质量为5.725±0.039GeV的B■束缚态可以被解释为B_(s0)~*(5725),而预言的B_0~*(5536)和B_0~*(5819)应为与B_(s0)~*(5725)相对应的非奇异态.

D0^＊ （2308） and B0^＊ resonances are discussed with the molecular state assumption in the heavy chiral unitary approach. By studying the heavy baryon-pseudoscalar meson interaction, some molecular states are found. It is shown that there exists a bound DK state with a mass of about 2.312 ± 0.041GeV in the strange sector, which can be identified as Ds0^＊（2317）. While in the non-strange sector, one wide-width state at about 2.1GeV and one narrow-width state at about 2.44GeV are found. These states should be associated with the D0^＊ state. Therefore, D0^＊ （2308） cannot be explained by the assumption of the molecular structure only. Moreover, Bs0^＊ and B0^＊ states are also predicted. A BK^- bound state with the mass of 5.725± 0.039GeV which can be assigned to the Bs0^＊（5725） state and B0^＊（5536） and B0^＊（5819） should be considered as the corresponding states in the non-strange sector.