An exploratory study of Higgs-boson pair production

Abstract

Higgs-boson pair production is well known being capable to probe the trilinear self-coupling of the Higgs boson, which is one of the important ingredients of the Higgs sector itself. Pair production then depends on the top-quark Yukawa coupling g S,P t , Higgs trilinear coupling λ 3H , and a possible dim-5 contact-type ttHH coupling g S,P tt , which may appear in some higher representations of the Higgs sector. We take into account the possibility that the top-Yukawa and the ttHH couplings involved can be CP violating. We calculate the cross sections and the interference terms as coefficients of the square or the 4th power of each coupling (g S,P t , λ 3H , g S,P tt ) at various stages of cuts, such that the desired cross section under various cuts can be obtained by simply inputing the couplings. We employ the HH → γγbb decay mode of the Higgs-boson pair to investigate the possibility of disentangle the triangle diagram from the box digram so as to have a clean probe of the trilinear coupling at the LHC. We found that the angular separation between the b andb and that between the two photons is useful. We obtain the sensitivity reach of each pair of couplings at the 14 TeV LHC and the future 100 TeV pp machine. Finally, we also comment on using the bbτ + τ − decay mode in appendix.

Effective theories of universal theories

“…With the redefinitions (3.25) and (3.26), all the new physics modifications to L h are encoded in the momentum-independent Higgs boson self-interactions. In particular, the correction to the triple-Higgs coupling can lead to observable effects in double-Higgs production [92][93][94][95][96][97][98][99][100][101][102][103][104][105][106][107]. We parametrize the deviation from the SM by defining 1 + ∆κ 3 to be the coefficient of −λvh 3 , with…”

Electroweak baryogenesis with anomalous Higgs couplings

“…The best way to probe the cubic Higgs coupling can be is through the radiative process of double Higgs production (for recent works see [69]- [78]). At 1-loop level there are two diagrams responsible for this process: triangle diagram which involves Higgs-top Yukawa and Higgs cubic couplings and the box diagrams which involve only Higgs-top Yukawa coupling.…”

Triple Higgs coupling in the most general 2HDM at SM-like scenario

“…It was found for many reasonable benchmark points that these anomalous interactions are difficult to observe [50][51][52][53][54]. The other approach is to consider some special form of BSM.…”