Programme

O.7 -- Oral, VCTP-47

Date: Tuesday, 2 August 2022

Time: 14:40 - 15:05

The neutrino masses and theirs effects on the Higgs sector of the Next-toTwo Higgs Doublet Model including Inverse Seesaw mechanism

Le Truong My Hau (1), Thi Nhung Dao (2)

(1) University of Science Ho Chi Minh City, 227 Nguyen Van Cu, District 5, HCM City, Vietnam - Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, HCM City, Vietnam; (2) Phenikaa University, Hanoi 12116, Vietnam

The Higgs mechanism is the spirit of the Standard Model that generates particle masses. That is the reason why checking the Higgs potential is an important goal in experiments. Although the couplings of Higgs boson with SM particles have been measured and are consistent with the Standard Model, the Higgs potential has not yet confirmed experimentally. The shape of this potential is govern by a parameter $\lambda$, that drives the strength of the Higgs boson self-couplings. It can be determined experimetally through a measurement of Higgs pair production. Currently, its value is still far away from the required accuracy and therefore allows new physics effects.\\ \\ In this talk, we report on our computation of trilinear Higgs couplings at the one-loop level in the CP-conserving Next-to-Two Higgs Doublet Model including Inverse Seesaw Mechanism by using the Feynman-diagrammatic approach. The Inverse Seesaw Mechanism introduces heavy neutrinos that can give a large contribution to trilinear Higgs couplings. We discuss renormalization schemes used for the Higgs sector to cancel UV divergences. The Feynman rule is generated by SARAH, the amplitude calculated by FeynArt and FormCalc, and we use LoopTools for the computation of loop integrals. We have taken into account constrains from the Higgs data by using HiggsBounds and HiggsSignals, and from neutrino oscillation data to find the available parameter space. We found that loop effects can be of order 30\%.

Presenter: Le Truong My Hau