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arXiv 1102.3375hep-ph
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具有么正性和因果性的手征动力学的Compton散射

Compton scattering from chiral dynamics with unitarity and causality

A. M. Gasparyan, M. F. M. Lutz, B. Pasquini

摘要:

用手征拉格朗日量分析质子康普顿散射。分波振幅的手征微扰理论计算的阈下反应振幅的解析外推,其中的电磁规范不变性,因果关系和幺正性的约束设置用于稳定的外推。我们提出并讨论了各种自旋观测和质子的极化率的预测。而对于跃迁极化率$γ_{E1M2}, γ_{M1E2}$,我们恢复严格手征微扰理论的结果,对角$γ_{E1E1}, γ_{M1M1}$元素,我们发现显着的影响,从再散射。

英文摘要:

Proton Compton scattering is analyzed with the chiral Lagrangian. Partial-wave amplitudes are obtained by an analytic extrapolation of subthreshold reaction amplitudes computed in chiral perturbation theory, where the constraints set by electromagnetic-gauge invariance, causality and unitarity are used to stabilize the extrapolation. We present and discuss predictions for various spin observables and polarizabilties of the proton. While for the transition polarizabilities $γ_{E1M2}, γ_{M1E2}$ we recover the results of strict chiral perturbation theory, for the diagonal $γ_{E1E1}, γ_{M1M1}$ elements we find significant effects from rescattering.

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