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arXiv 2104.04019hep-ph
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磁场中QED的费米子质量和宽度

Fermion mass and width in QED in a magnetic field

Alejandro Ayala, Jorge David Castaño-Yepes, M. Loewe, Enrique Muñoz

摘要:

我们重新讨论了在有磁场存在的情况下QED中费米子自能的计算。我们表明,在进行重整化过程,并确定最一般的微扰张量结构的修改后的费米子{质量运营商}在大的字段限制,质量开发的虚部。当考虑到与朗道水平相关的次领先贡献而不是最低水平时,就会发生这种情况。虚部与描述质量函数在动量中的扩展的谱密度相关联。分布的中心对应于磁场修正质量。随着场强的增加,宽度变小,对于渐近大的场值,当朗道能级之间的间隔也变大时,质量函数描述了一个只占据最低朗道能级的稳定粒子。对于大但有限的磁场值,谱密度表示费米子占据朗道能级而不是LLL的有限概率。

英文摘要:

We revisit the calculation of the fermion self-energy in QED in the presence of a magnetic field. We show that, after carrying out the renormalization procedure and identifying the most general perturbative tensor structure for the modified fermion {mass operator} in the large field limit, the mass develops an imaginary part. This happens when account is made of the sub-leading contributions associated to Landau levels other than the lowest one. The imaginary part is associated to a spectral density describing the spread of the mass function in momentum. The center of the distribution corresponds to the magnetic-field modified mass. The width becomes small as the field intensity increases in such a way that for asymptotically large values of the field, when the separation between Landau levels becomes also large, the mass function describes a stable particle occupying only the lowest Landau level. For large but finite values of the magnetic field, the spectral density represents a finite probability for the fermion to occupy Landau levels other than the LLL.

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