φ（1020）a0（980）S波散射和一种新的矢量-等矢量共振
The phi(1020) a0(980) S-wave scattering and hints for a new vector-isovector resonance
摘要：
本文利用手征拉格朗日量与矢量介子的最小耦合，研究了阈能下的φ（1020）a0（980）S波散射。通过将标量等矢量a0（980）共振视为在耦合通道中动态产生的，并要求再现最近测量的e+ e- -> phi（1020）f0（980）截面，在没有新的自由参数的情况下描述了相互作用。对于一些现实的选择的参数，一个动态生成的isovector同伴的Y（2175）的存在被揭示。我们还研究了由终态中的φ（1020）α 0（980）再散射引起的e+ e-> φ（1020）π 0 η反应截面的修正。它们通常很大并且基本上改变了截面。对于一个合适的参数选择，共振的存在将表现为一个明确的峰在sqrt{s}~2.03 GeV的e+ e- -> phi（1020）π 0 eta。
英文摘要：
We have studied the phi(1020)a0(980) S-wave scattering at threshold energies employing chiral Lagrangians coupled to vector mesons by minimal coupling. The interaction is described without new free parameters by considering the scalar isovector a0(980) resonance as dynamically generated in coupled channels, and demanding that the recently measured e+ e- -> phi(1020) f0(980) cross section is reproduced. For some realistic choices of the parameters, the presence of a dynamically generated isovector companion of the Y(2175) is revealed. We have also investigated the corrections to the e+ e- -> phi(1020) pi0 eta reaction cross section that arise from phi(1020)a0(980) re-scattering in the final state. They are typically large and modify substantially the cross section. For a suitable choice of parameters, the presence of the resonance would manifest itself as a clear peak at sqrt{s}~2.03 GeV in e+ e- -> phi(1020) pi0 eta.
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