Anatomy of the Higgs Boson Decay into Two Photons in the Unitary Gauge
We review and clarify computational issues about the W -gauge boson one-loop contribution to the...
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2013-01-01
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| Series: | Advances in High Energy Physics |
| Online Access: | http://dx.doi.org/10.1155/2013/631841 |
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| author | Athanasios Dedes Kristaq Suxho |
| author_facet | Athanasios Dedes Kristaq Suxho |
| author_sort | Athanasios Dedes |
| collection | DOAJ |
| description | We review and clarify computational issues about the
W
-gauge boson one-loop contribution to the
H
→
γ
γ
decay amplitude, in the unitary gauge and in the Standard Model. We find that highly divergent integrals depend upon the choice of shifting momenta with arbitrary vectors. One particular combination of these arbitrary vectors reduces the superficial divergency down to a logarithmic one. The remaining ambiguity is then fixed by exploiting gauge invariance and the Goldstone Boson Equivalence Theorem. Our method is strictly realised in four dimensions. The result for the amplitude agrees with the “famous” one obtained using dimensional regularisation (DR) in
the limit
d
→
4
, where
d
is the number of spatial dimensions in Euclidean space. At the exact equality
d
=
4
, a three-sphere surface term appears that renders the Ward Identities and the equivalence theorem inconsistent. We also examined a recently proposed four-dimensional regularisation scheme and found agreement with the DR outcome. |
| format | Article |
| id | doaj-art-f0f523022f7a41eea3d0db1ac7e17b75 |
| institution | Kabale University |
| issn | 1687-7357 1687-7365 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in High Energy Physics |
| spelling | doaj-art-f0f523022f7a41eea3d0db1ac7e17b752025-02-03T01:00:10ZengWileyAdvances in High Energy Physics1687-73571687-73652013-01-01201310.1155/2013/631841631841Anatomy of the Higgs Boson Decay into Two Photons in the Unitary GaugeAthanasios Dedes0Kristaq Suxho1Division of Theoretical Physics, University of Ioannina, 45110 Ioannina, GreeceDivision of Theoretical Physics, University of Ioannina, 45110 Ioannina, GreeceWe review and clarify computational issues about the W -gauge boson one-loop contribution to the H → γ γ decay amplitude, in the unitary gauge and in the Standard Model. We find that highly divergent integrals depend upon the choice of shifting momenta with arbitrary vectors. One particular combination of these arbitrary vectors reduces the superficial divergency down to a logarithmic one. The remaining ambiguity is then fixed by exploiting gauge invariance and the Goldstone Boson Equivalence Theorem. Our method is strictly realised in four dimensions. The result for the amplitude agrees with the “famous” one obtained using dimensional regularisation (DR) in the limit d → 4 , where d is the number of spatial dimensions in Euclidean space. At the exact equality d = 4 , a three-sphere surface term appears that renders the Ward Identities and the equivalence theorem inconsistent. We also examined a recently proposed four-dimensional regularisation scheme and found agreement with the DR outcome.http://dx.doi.org/10.1155/2013/631841 |
| spellingShingle | Athanasios Dedes Kristaq Suxho Anatomy of the Higgs Boson Decay into Two Photons in the Unitary Gauge Advances in High Energy Physics |
| title | Anatomy of the Higgs Boson Decay into Two Photons in the Unitary Gauge |
| title_full | Anatomy of the Higgs Boson Decay into Two Photons in the Unitary Gauge |
| title_fullStr | Anatomy of the Higgs Boson Decay into Two Photons in the Unitary Gauge |
| title_full_unstemmed | Anatomy of the Higgs Boson Decay into Two Photons in the Unitary Gauge |
| title_short | Anatomy of the Higgs Boson Decay into Two Photons in the Unitary Gauge |
| title_sort | anatomy of the higgs boson decay into two photons in the unitary gauge |
| url | http://dx.doi.org/10.1155/2013/631841 |
| work_keys_str_mv | AT athanasiosdedes anatomyofthehiggsbosondecayintotwophotonsintheunitarygauge AT kristaqsuxho anatomyofthehiggsbosondecayintotwophotonsintheunitarygauge |