Probing the standard model and beyond through \(h \rightarrow \gamma \gamma\) decay

This paper explores the decay of the Higgs boson in the diphoton decay channel as a probe for the Standard Model and potential Beyond Standard Model phenomena. An outline of the Higgs mechanism in the context of the electroweak theory is presented, followed by the computation of the SM Higgs boson decay width using dimensional regularization and Passarino-Veltman reduction implemented through Package-X. Additional contributions of charged scalars arising in various BSM theories are considered. Using recent experimental measurement of the diphoton signal strength, constraints are placed on the parameters of singly and doubly charged Higgses. The fit shows a mild preference for nonzero negative couplings at the \(1\sigma\) level, which is not statistically significant.

Raziskovanje (onkraj) Standardnega modela prek razpada \(h \rightarrow \gamma \gamma\)

Članek obravnava razpad Higgsovega bozona v dva fotona in njegovo vlogo pri iskanju procesov onkraj Standardnega modela. Predstavljen je Higgsov mehanizem v kontekstu elektrošibke teorije. Sledi izračun razpadne širine Higgsovega bozona v Standardnem modelu z uporabo Package-X, ki sloni na dimenzacijski regularizaciji in Passarino-Veltman redukciji. Dodatno so obravnavani prispevki procesov, ki vključujejo nabite skalarje, prisotne v razširitvah Standardnega modela. Na podlagi eksperimentalnih podatkov so določene omejitve parametrov enojno in dvojno nabitih skalarjev, pri čemer je opazna težnja k negativnim sklopitvam pri \(1\sigma\), kar pa ni statistično signifikantno.