Impact of top-Higgs couplings on Di-Higgs production at future colliders

We investigate feasibility of efficient baryogenesis at the electroweak scale within the effective field theory framework based on a non-linear realisation of the electroweak gauge symmetry. In this framework the LHC Higgs boson is described by a singlet scalar field, which, therefore, admits new interactions. Assuming that Higgs couplings with the eletroweak gauge bosons are as in the Standard Model, we demonstrate that the Higgs cubic coupling and the CP-violating Higgs-top quark anomalous couplings alone may drive the a strongly first-order phase transition. The distinguished feature of this transition is that the anomalous Higgs vacuum expectation value is generally non-zero in both phases. We identify a range of anomalous couplings, consistent with current experimental data, where sphaleron rates are sufficiently fast in the 'symmetric' phase and are suppressed in the 'broken' phase and demonstrate that the desired baryon asymmetry can indeed be generated in this framework. This range of the Higgs anomalous couplings can be further constrained from the LHC Run 2 data and be probed at high luminosity LHC and beyond.

Section: Jhep04(2016)011mentioning

confidence: 87%

Electroweak baryogenesis with anomalous Higgs couplings

Kobakhidze

Yue

2016

“…Note that the effects of the CP-odd part of the top-Yukawa coupling at the LHC, ILC, and photon colliders were studied in ref. [24], though we study the effects in depth for the LHC here.…”

Section: Jhep08(2015)133mentioning

confidence: 99%

“…[28], and CPV1 in ref. [24]. The scenario CPV2 is new with the CP-odd component of the ttHH, in which the CP-odd component g P tt of the ttHH coupling appears either with g P t or in square.…”

Section: Jhep08(2015)133mentioning

confidence: 99%

“…One of the best probes is Higgs-boson-pair production at the LHC. There have been a large number of works of Higgs-pair production in the SM [10][11][12][13][14][15][16][17][18][19], in model-independent fashion [20][21][22][23][24][25][26][27][28][29], and in special models beyond the SM [30][31][32][33][34][35][36][37][38][39] and in SUSY [40][41][42][43]. In the SM, Higgs-pair production receives contributions from two entangled sources, the triangle and box diagrams.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An exploratory study of Higgs-boson pair production

Chang

Cheung

et al. 2015

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.

“…Physics beyond the SM (BSM) can easily affect the Higgs pair production cross section at the LHC through either modification in the top Yukawa coupling and/or new colored particles running in the triangle and box loops (non-resonance effects), or the existence of new heavy scalars decaying into Higgs pairs (resonance effect). The enhancement in production cross section can reach a few orders of magnitude in some cases [31][32][33][34][35][36][37][38][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57]. Currently, the ATLAS and CMS Collaborations have imposed upper limits on the production cross section (bbγγ) and production cross section times branching ratios (4b, γγW W * and τ τ bb) with various categories of signal final states in Higgs pair searches at the 13-TeV LHC [58][59][60][61][62][63][64][65][66][67][68][69][70][71]: 3.9 pb, 33 fb, 25 pb and 508 fb for the γγbb, 4b, γγW W * and τ τ bb channels, respectively.…”

Section: Introductionmentioning

confidence: 99%

Higgs boson pair productions in the Georgi-Machacek model at the LHC

Chang

Chen

Chiang

2017

Higgs bosons pair production is well known for its sensitivity to probing the sign and size of Higgs boson self coupling, providing a way to determine whether there is an extended Higgs sector. The Georgi-Machacek (GM) model extends the Standard Model (SM) with an SU(2) L triplet scalar field that has one real and one complex components. The Higgs self coupling now has a wider range than that in the SM, with even the possibility of a sign flip. The new heavy singlet Higgs boson H 0 1 can contribute to s-channel production of the hh pairs. In this work, we study non-resonant/resonant Higgs boson pair productions pp → hh and pp → H 0 1 → hh, focusing exclusively on the contribution of H 0 1 . We show the sensitivity for Higgs boson pair production searches at the 13-TeV LHC with the luminosities of 3.2, 30 and 100 fb −1 .