Once more on the W-loop contribution to the Higgs decay into two photons
| Autor: | Christova, Ekaterina, Todorov, Ivan |
|---|---|
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Bulg. J. Phys. v.42 (2015) 296 -303 |
| Druh dokumentu: | Working Paper |
| Popis: | The imaginary part of the Feynman amplitude of the $W$-loop contribution to the Higgs decay into two gammas (viewed as a function of the square of the off shell Higgs momentum) is finite and unambiguous. It is presented as the product of an invariant amplitude ${\cal A}$ times a bilinear in the components of the (on shell) photon momenta factor which takes the Ward identity into account. The unsubtracted dispersion integral of ${\cal A}$ is convergent and reproduces the amplitude computed by R. Gastmans, S.L. Wu and T.T. Wu [GWW]. In particular, the decoupling theorem, criticized as an unjustified assumption in a subsequent paper [SVVZ12], is obtained as a corollary. By contrast with the currently used value (computed in [SVVZ]) our calculation provides a smaller Higgs decay rate into 2 photons than the currently observed. If accepted as a true prediction of the Standard Model, it would be a first indication for the need of a New Physics. Comment: new discussions added at the end of Sec.3, 3 references added, changes at the end of the Abstract |
| Databáze: | arXiv |
| Externí odkaz: |
|