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arXiv 0908.2192hep-ph
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在φ共振下e+e- -> pi+ pi-γ中的电荷不对称性

Charge asymmetries in e+e- -> pi+ pi- gamma at the phi resonance

A. Gallegos, J. L. Lucio, G. Moreno, M. Napsuciale

摘要:

我们考虑了e^{+}e^{-} \to π^{+}π^{-}γ过程的前向-后向π介子电荷不对称性。在树的水平上,我们考虑韧致辐射和双共振的贡献。虽然后者的贡献是正式的次领先,它是增强低的双介子不变质量由于$ρ$共振效应。我们还考虑了四种不同的模型来描述环水平的末态辐射:共振手征微扰理论,统一手征微扰理论,K介子环模型和线性西格玛模型。最后三个模型产生的结果与实验数据相一致。Kaon环模型需要一个能量依赖的阶段来实现协议。

英文摘要:

We consider the forward-backward pion charge asymmetry for the e^{+}e^{-}\toπ^{+}π^{-}γprocess. At tree level we consider bremsstrahlung and double resonance contributions. Although the latter contribution is formally sub-leading, it is enhanced at low dipion invariant mass due to $ρ$ resonant effects. We consider also four alternative models to describe the final state radiation at the loop level: Resonance Chiral Perturbation Theory, Unitarized Chiral Perturbation Theory, Kaon Loop Model and Linear Sigma Model. The last three models yield results compatible with experimental data. The Kaon Loop Model requires an energy dependent phase to achieve the agreement.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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