A Dispersive Analysis on the f0(600) and f0(980) Resonances in gamma gamma ---> pi+ pi-, pi0 pi0 Processes
A Dispersive Analysis on the f0(600) and f0(980) Resonances in gamma gamma ---> pi+ pi-, pi0 pi0 Processes
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DOI：
10.1103/physrevd.79.116008
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发表时间：
2009-04
影响因子：
5
通讯作者：
Y. Mao;Xuan Wang;O. Zhang;H. Zheng;Z. Zhou
中科院分区：
文献类型：
--
作者：
Y. Mao;Xuan Wang;O. Zhang;H. Zheng;Z. Zhou
我们估计的双光子耦合的f {sub 0}（600），f {sub 0}（980），和f {sub 2}（1270）共振的耦合通道色散的方法。利用解析性较好的{pi}{pi}散射的单通道T矩阵重新研究了f {sub 0}（600）双光子耦合，发现其耦合强度明显小于qq态的耦合强度.特别地，我们还估计了位于KK阈值附近的第三层极的双光子耦合，记为f {sub 0}{sup III}（980）。有人认为，这种第三层极可能起源于耦合通道Breit-Wigner描述的f {sub 0}（980）共振。
We estimate the diphoton coupling of f{sub 0}(600), f{sub 0}(980), and f{sub 2}(1270) resonances in a coupled channel dispersive approach. The f{sub 0}(600) diphoton coupling is also reinvestigated using a single channel T matrix for {pi}{pi} scattering with better analyticity property, and it is found to be significantly smaller than that of a qq state. Especially we also estimate the diphoton coupling of the third-sheet pole located near KK threshold, denoted as f{sub 0}{sup III}(980). It is argued that this third-sheet pole may be originated from a coupled channel Breit-Wigner description of the f{sub 0}(980) resonance.