Higgs Decay into Two Photons, Revisited
Higgs Decay into Two Photons, Revisited
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发表时间：
2011-08
期刊：
影响因子：
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通讯作者：
R. Gastmans;S. Wu;T. Wu
中科院分区：
文献类型：
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作者：
R. Gastmans;S. Wu;T. Wu
给出了么正规范中虚W引起的Higgs衰变H->\gamma\gamma\振幅的单圈计算。由于希格斯粒子并不直接与无质量光子耦合，因此单圈振幅是有限的。计算是以一种直接的方式进行的，不会遇到分歧。特别地，避免了像维度正则化的伪像。这是通过明智地将外部动量路由通过回路，并在对回路动量进行积分之前组合振幅的被积函数来实现的。本文的结果满足无穷大Higgs质量的退耦定理，因而不同于早先在\xi=1规范中用维数正则化得到的结果.结果之间的差异可以追溯到使用维度正则化。
The one-loop calculation of the amplitude for the Higgs decay H-->\gamma\gamma\ due to virtual W's in the unitary gauge is presented. As the Higgs does not directly couple to the massless photons, the one-loop amplitude is finite. The calculation is performed in a straightforward way, without encountering divergences. In particular, artifacts like dimensional regularization are avoided. This is achieved by judiciously routing the external momenta through the loop and by combining the integrands of the amplitudes before carrying out the integration over the loop momentum. The present result satisfies the decoupling theorem for infinite Higgs mass, and is thus different from the earlier results obtained in the \xi=1 gauge using dimensional regularization. The difference between the results is traced to the use of dimensional regularization.