Lepton-proton two-photon exchange in chiral perturbation theory

Lepton-proton two-photon exchange in chiral perturbation theory
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手性微扰理论中的轻子-质子双光子交换

DOI:
10.1103/physrevd.101.013008
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发表时间:
2019
期刊:
影响因子:
5
通讯作者:
F. Myhrer
F. Myhrer
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
P. Talukdar;V. Shastry;U. Raha;F. Myhrer

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利用重子手征微扰理论,计算了包含非零轻子质量的低能弹性轻子-质子散射的双光子交换修正。在软光子近似下,我们将双光子交换中的弹性质子中间态放在一起考虑。利用量纲正则化方法投影出红外信号的奇异贡献。由此得到的红外无奇异性双光子交换贡献与现有的基于标准图解软光子近似评估的预测很好地符合。
We use heavy baryon chiral perturbation theory to evaluate the two-photon exchange corrections to the low-energy elastic lepton-proton scattering at next-to-leading order accuracy, i.e., ${\mathcal O}(\alpha, M^{-1})$, including a non-zero lepton mass. We consider the elastic proton intermediate state in the two-photon exchange together in the soft photon approximation. The infrared singular contributions are projected out using dimensional regularization. The resulting infrared singularity-free two-photon exchange contribution is in good numerical agreement with existing predictions based on standard diagrammatic soft photon approximation evaluations.
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