Pair production of 125 GeV Higgs boson in the SM extension with color-octet scalars at the LHC

Heng, Zhaoxia; Shang, Liangliang; Zhang, Yanming; Zhang, Yang; Zhu, J.

doi:10.1007/jhep02(2014)083

Cited by 18 publications

(7 citation statements)

References 80 publications

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“…Physics beyond SM could alter Higgs pair production dramatically. The neutral Higgs pair production has been investigated in a variety of models including, for instance, MSSM [77], NMSSM [83,84], 2HDM [85][86][87][88], extended colored scalars [85,89,90], extended colored fermions [85,91,92], Little Higgs [93], Higgs portal [94,95] and composite Higgs models [96,97]. There are also model independent approaches based on effective operators [98][99][100].…”

Section: Signals For Neutral Scalarsmentioning

confidence: 99%

LHC phenomenology of the type II seesaw mechanism: Nondegenerate case

2015

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In this paper, we thoroughly investigate the LHC phenomenology of the type II seesaw mechanism for neutrino masses in the nondegenerate case where the triplet scalars of various charge (H ±± , H ± , H 0 , A 0 ) have different masses. Compared with the degenerate case, the cascade decays of scalars lead to many new, interesting signal channels. In the positive scenario where M H ±± < M H ± < M H 0 /A 0 , the four-lepton signal is still the most promising discovery channel for the doubly-charged scalars H ±± . The five-lepton signal is crucial to probe the mass spectrum of the scalars, for which, for example, a 5σ reach at 14 TeV LHC for M H ± = 430 GeV with M H ±± = 400 GeV requires an integrated luminosity of 76 fb −1 . And the six-lepton signal can be used to probe the neutral scalars H 0 /A 0 , which are usually hard to detect in the degenerate case. In the negative scenario where M H ±± > M H ± > M H 0 /A 0 , the detection of H ±± is more challenging, when the cascade decay H ±± → H ± W ± * is dominant. The most important channel is the associated H ± H 0 /A 0 production in the final state ± E T b bb b, which requires a luminosity of 109 fb −1 for a 5σ discovery, while the final state ± E T b bτ + τ − is less promising. Moreover, the associated H 0 A 0 production can give same signals as the standard model Higgs pair production. With a much larger cross section, the H 0 A 0 production in the final state b bτ + τ − could reach 3σ significance at 14 TeV LHC with a luminosity of 300 fb −1 . In summary, with an integrated luminosity ∼ O(500 fb −1 ), the triplet scalars can be fully reconstructed at 14 TeV LHC in the negative scenario.

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Section: Signals For Neutral Scalarsmentioning

confidence: 99%

LHC phenomenology of the type II seesaw mechanism: Nondegenerate case

2015

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“…Beyond-the-SM (BSM) physics can contribute to 2h production in a variety of ways, including anomalous tth (bbh) and tthh (bbhh) couplings [31][32][33][34][35][36][37][38], resonant enhancements [39][40][41][42][43][44][45][46][47][48], exotic decays [48,49] and new colored scalar [50][51][52][53][54][55] or fermonic [56][57][58][59][60][61][62] particles contributing to the loop amplitudes. Some of these effects, for example the modified tth couplings or new colored particles in the loop, also affect the single Higgs (1h) production in the gg → h channel.…”

mentioning

confidence: 99%

What’s in the loop? The anatomy of double Higgs production

2015

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Determination of Higgs self-interactions through the double Higgs production from gluon fusion is a major goal of current and future collider experiments. We point out this channel could help disentangle and resolve the nature of ultraviolet contributions to Higgs couplings to two gluons.Analytic properties of the double Higgs amplitudes near kinematic threshold are used to study features resulting from scalar and fermionic loop particles mediating the interaction. Focusing on the hh invariant mass spectrum, we consider the effect from anomalous top and bottom Yukawa couplings, as well as from scalar and fermionic loop particles. In particular, the spectrum at high hh invariant mass is sensitive to the spin of the particles in the loop.

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“…At both the LHC and the ILC, the Higgs self-coupling can be measured directly through the Higgs pair production [45][46][47][48][49][50][51][52][53][54][55][56][57][58][59]. The recent studies suggest that a precision of 50% for the coupling can be obtained through pp → hh → bbγγ at the HL-LHC with an integrated luminosity of 3000 fb −1 [36][37][38][39][60][61][62][63][64], and it may be further improved to be around 13% at the ILC with collision energy up to 1TeV [36][37][38][39].…”

Section: Jhep08(2014)138mentioning

confidence: 99%

Higgs-strahlung production process e + e − → Zh at the future Higgs factory in the Minimal Dilaton Model

Cao

Heng

et al. 2014

J. High Energ. Phys.

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Abstract:We investigate the Higgs-strahlung production process e + e − → Zh at the future Higgs factory such as TLEP by including radiative corrections in the Minimal Dilaton Model (MDM), which extends the SM by one singlet scalar called dilaton. We consider various theoretical and experimental constraints on the model, and perform fits to the Higgs data taken from ATLAS, CMS and CDF+D0. Then for the 1σ surviving samples, we calculate the MDM predictions on the inclusive production rate σ(e + e − → Zh) at the 240-GeV Higgs factory, and also the signal rates of e + e − → Zh with the Higgs boson decaying to bb and γγ. We have following observations: (1) In the heavy dilaton scenario, the deviation of σ(e + e − → Zh) from its SM prediction can vary from −15% to 85%, which mainly arises from the modification of the tree-level hZZ coupling and also the radiative correction induced by possibly large Higgs self-couplings. (2) The processes e + e − → Zh at the Higgs factory and pp → hh at 14-TeV LHC are complementary in limiting the MDM parameter space. Requiring the deviation of σ(e + e − → Zh) from its SM prediction to be less than 1% and that of σ(pp → hh) to be less than 50%, tan θ S in the MDM will be limited to be −0.1 < tan θ S < 0.3, and the deviations of the signal rates are constrained to be |R bb | < 2% and |R γγ | < 7%. Especially, the Higgs self-coupling normalized to its SM prediction is now upper bounded by about 4. (3) In the light dilaton scenario, the deviation of σ(e + e − → Zh) may reach −7%, and requiring its size to be less than 1% will result in 0 < tan θ S < 0.1, and −10% < R bb , R γγ < 1%.

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Pair production of 125 GeV Higgs boson in the SM extension with color-octet scalars at the LHC

Cited by 18 publications

References 80 publications

LHC phenomenology of the type II seesaw mechanism: Nondegenerate case

LHC phenomenology of the type II seesaw mechanism: Nondegenerate case

What’s in the loop? The anatomy of double Higgs production

Higgs-strahlung production process e + e − → Zh at the future Higgs factory in the Minimal Dilaton Model

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