Role of supersymmetric heavy Higgs boson production in the self-coupling measurement of 125 GeV Higgs boson at the LHC

As a most natural realization of the Next-to Minimal Supersymmetry Standard Model (NMSSM), λ-SUSY is parameterized by a large λ around one and a low tan β below 10. In this work, we first scan the parameter space of λ-SUSY by considering various experimental constraints, including the limitation from the Higgs data updated by the ATLAS and CMS collaborations in the summer of 2014, then we study the properties of the Higgs bosons. We get two characteristic features of λ-SUSY in experimentally allowed parameter space. One is the triple self coupling of the SM-like Higgs boson may get enhanced by a factor over 10 in comparison with its SM prediction. The other is the pair production of the SM-like Higgs boson at the LHC may be two orders larger than its SM prediction. All these features seems to be unachievable in the Minimal Supersymmetric Standard Model and in the NMSSM with a low λ. Moreover, we also find that naturalness plays an important role in selecting the parameter space of λ-SUSY, and that the Higgs χ 2 obtained with the latest data is usually significantly smaller than before due to the more consistency of the two collaboration measurements.

Section: Jhep12(2014)026mentioning

confidence: 97%

“…• Through the resonant effect of a CP-even state h i [58][59][60][61]. In SUSY, h i may be onshell produced by gg or bb initial state.…”

Section: Jhep12(2014)026mentioning

confidence: 99%

Exploring the Higgs sector of a most natural NMSSM and its prediction on Higgs pair production at the LHC

Cao

Shang

et al. 2014

“…Besides, a large deviation in the self-coupling may be a direct evidence for strong first-order electroweak phase transition in the early universe [58,59]. At the LHC, the di-Higgs production is the only way to measure the Higgs self-coupling and is dominated by the gluon-gluon fusion mechanism, which has JHEP01(2015)008 been widely studied in recent years (see examples in SM after 125 GeV Higgs boson [60][61][62][63][64]; see examples in MSSM and NMSSM after 125 GeV Higgs boson, [65][66][67][68][69]; see examples in 2HDM after 125 GeV Higgs boson, [70][71][72][73]; see examples in other models after 125 GeV Higgs boson, [74][75][76][77][78][79][80][81][82][83][84][85]). Among various decay channels, although the 4b final state has the largest fraction, the rare process hh → bbγγ is expected to have the most promising sensitivity due to the low QCD backgrounds at the LHC [86][87][88][89][90][91][92][93].…”

Section: Introductionmentioning

confidence: 99%

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

Liu

Yang

et al. 2015

Measuring the Higgs-self coupling is one of the most crucial goals of the future colliders, such as the LHC Run-II and the ILC-based photon collider. Since the new physics can affects the di-Higgs production not only from the Higgs self-coupling but also from the top-Higgs coupling, we investigate the di-Higgs production in the presence of the non-standard top-Higgs coupling at the LHC and ILC-based photon collider given the recent Higgs data. Due to the changed interference behaviors of the top quark loops with itself or W boson loops, we find that the cross section of di-Higgs production at the LHC-14 TeV and ILC-500 GeV can be respectively enhanced up to nearly 3 and 2 times the SM predictions within 2σ Higgs data allowed parameter region.

“…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 .