Analysis of the <Emphasis Type="Italic">Y</Emphasis>(4140) and related molecular states with QCD sum rules |
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| Authors: | Zhi-Gang Wang Zhi-Cheng Liu and Xiao-Hong Zhang |
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| Institution: | 1.Department of Physics,North China Electric Power University,Baoding,People’s Republic of China |
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| Abstract: | In this article, we assume that there exist scalar D*`(D)]*{D}^{\ast}{\bar {D}}^{\ast}, Ds*`(D)]s*{D}_{s}^{\ast}{\bar{D}}_{s}^{\ast}, B*`(B)]*{B}^{\ast}{\bar {B}}^{\ast} and Bs*`(B)]s*{B}_{s}^{\ast}{\bar{B}}_{s}^{\ast} molecular states, and study their masses using the QCD sum rules. The numerical results indicate that the masses are about
(250–500) MeV above the corresponding D
*–`(D)]*{\bar{D}}^{\ast}, D
s
*–`(D)]s*{\bar {D}}_{s}^{\ast}, B
*–`(B)]*{\bar{B}}^{\ast} and B
s
*–`(B)]s*{\bar {B}}_{s}^{\ast} thresholds, the Y(4140) is unlikely a scalar Ds*`(D)]s*{D}_{s}^{\ast}{\bar{D}}_{s}^{\ast} molecular state. The scalar D*`(D)]*D^{\ast}{\bar{D}}^{\ast}, Ds*`(D)]s*D_{s}^{\ast}{\bar{D}}_{s}^{\ast}, B*`(B)]*B^{\ast}{\bar{B}}^{\ast} and Bs*`(B)]s*B_{s}^{\ast}{\bar{B}}_{s}^{\ast} molecular states maybe not exist, while the scalar D￠*`(D)]￠*{D'}^{\ast}{\bar{D}}^{\prime\ast}, Ds￠*`(D)]s￠*{D}_{s}^{\prime\ast}{\bar{D}}_{s}^{\prime\ast}, B￠*`(B)]￠*{B}^{\prime\ast}{\bar{B}}^{\prime\ast} and Bs￠*`(B)]s￠*{B}_{s}^{\prime\ast}{\bar{B}}_{s}^{\prime\ast} molecular states maybe exist. |
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| Keywords: | |
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