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arXiv 1408.0635hep-ph
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关于nmUED电弱区规范固定的注记

A note on gauge-fixing in the electroweak sector of nmUED

Anindya Datta, Avirup Shaw

摘要:

电弱观测量对回路修正高度敏感。因此,总是需要一个合适的规范固定机制来定义费曼环振幅所涉及的传播子。在此基础上,我们计算了具有边界局域项的五维普适超维(UED)模型的规范固定机制。这些BLT不是四维(4-D)有效理论中的5-D算子,而是在$S^1/Z_2$ orbifold的不动点处的相应场上的某种边界条件。此外,这些BLT非平凡地修改卡鲁扎-克莱因(KK)光谱和KK-激发之间的一些相互作用相比,最小的UED(mUED),其中,这些BLT是不存在的。在本文中,我们计算了这种非平凡的UED场景的电弱扇区中的规范固定机制。此外,我们讨论了戈德斯通和任何物理标量的组成和质量后出现的对称性破缺,在这个设置与不同的选择规范。

英文摘要:

Electroweak observables are highly sensitive to the loop corrections. Therefore, a proper gauge-fixing mechanism is always needed to define the propagators which are involved in Feynman loop amplitude. With this spirit we compute gauge-fixing mechanism in five dimensional (5-D) Universal Extra-Dimensional (UED) model with boundary localised terms (BLTs). These BLTs are not 5-D operators in four-dimensional (4-D) effective theory but some sort of boundary conditions on the respective fields at the fixed points of $S^1/Z_2$ orbifold. Furthermore, these BLTs non-trivially modify the Kaluza-Klein (KK) spectra and some of the interactions among the KK-excitations compared to the minimal UED (mUED), in which, these BLTs are absent. In this note we calculate the gauge-fixing mechanism in the electroweak sector of such non-trivial UED scenario. Moreover, we discuss the composition and masses of Goldstone and any physical scalar that emerge after the symmetry breaking in this set up with different choices of gauge.

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