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Elastic and radiative pi^+p scattering and properties of the Delta^{++} resonance

机译:弹性和辐射pi ^ + p散射和Delta ^ {++}的性质   谐振

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摘要

We study the Delta^{++} contributions to elastic and radiative \pi^+pscattering within an effective Lagrangian model which incorporates the Delta,N, rho and sigma meson degrees of freedom. This model provides a description ofthe Delta resonance and its interactions that respects electromagnetic gaugeinvariance and invariance under contact transformations when finite widtheffects are incorporated. Following recent developments in the description ofunstable gauge bosons, we use a complex mass scheme to introduce the finitewidth of the Delta^{++} without spoiling gauge invariance. The total crosssection of elastic \pi^+p scattering, whose amplitude exhibits the resonantplus background structure of S-matrix theory, is used to fix the mass, widthand strong coupling of the \Delta resonance. The differential cross section ofelastic scattering is found in very good agreement with experimental data. Themagnetic dipole moment of the Delta^{++}, \mu_{Delta}, is left as the onlyadjustable parameter in radiative \pi^+p scattering. From a fit to the mostsensitive configurations for photon emission in this process, we obtain\mu_{\Delta} = (6.14 +-0.51)e/2m_p, in agreement with predictions based on theSU(6) quark model.
机译:在有效的拉格朗日模型中,我们研究了Delta ^ {++}对弹性和辐射\ pi ^ + ps散射的贡献,该模型结合了Delta,N,rho和sigma介子自由度。当结合有限宽度效应时,该模型提供了关于Δ共振及其相互作用的描述,该Δ共振及其相互作用遵循电磁变换不变性和接触变换下不变性。遵循不稳定标尺玻色子描述的最新发展,我们使用了复杂的质量方案来引入Delta ^ {++}的有限宽度,而不会破坏标尺不变性。弹性\ pi ^ + p散射的总横截面,其振幅表现出S矩阵理论的共振加背景结构,用于固定δ共振的质量,宽度和强耦合。发现弹性散射的横截面与实验数据非常吻合。 Δ^ {++}的磁偶极矩\ mu_ {Delta}被保留为辐射\ pi ^ + p散射中唯一可调整的参数。从适合此过程中光子发射的最敏感配置,我们得到\ mu _ {\ Delta} =(6.14 + -0.51)e / 2m_p,与基于SU(6)夸克模型的预测一致。

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