Journal articles: 'Higgs couplings'

1

Kumar, Satendra, Poulose Poulose, Rafiqul Rahaman, and Ritesh K. Singh. "Measuring Higgs self-couplings in the presence of V V H and V V HH at the ILC." International Journal of Modern Physics A 34, no. 18 (June 28, 2019): 1950094. http://dx.doi.org/10.1142/s0217751x19500945.

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The recent discovery of a Higgs boson at LHC, while establishing the Higgs mechanism as the way of electroweak symmetry breaking, started an era of precision measurements involving the Higgs boson. In an effective Lagrangian framework, we consider the [Formula: see text] process, at an ILC running at a center-of-mass energy of 500 GeV to investigate the effect of the [Formula: see text] and [Formula: see text] couplings on the sensitivity of [Formula: see text] coupling on this process. Our results show that the sensitivity of the trilinear Higgs self-couplings on this process has somewhat strong dependence on the Higgs-gauge boson couplings. Single- and two-parameter reaches of ILC with integrated luminosity of 1000 fb[Formula: see text] are obtained on all the effective couplings indicating how these limits are affected by the presence of anomalous [Formula: see text] and [Formula: see text] couplings. The kinematic distributions studied to understand the effect of the anomalous couplings, again, show strong influence of [Formula: see text]–[Formula: see text] couplings on the dependence of these distributions on [Formula: see text] coupling. Similar results are indicated in the case of the process, [Formula: see text], considered at a center-of-mass energy of 2 TeV, where the cross-section is large enough. The effect of [Formula: see text] and [Formula: see text] couplings on the sensitivity of [Formula: see text] coupling is clearly established through our analyses in this process.

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RIZZO, THOMAS G. "ONE LOOP-INDUCED WZH COUPLING IN THE TWO HIGGS DOUBLET MODEL." Modern Physics Letters A 04, no. 28 (December 30, 1989): 2757–66. http://dx.doi.org/10.1142/s0217732389003087.

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Although absent at the tree level in models with only doublet and singlet Higgs representations, the WZH coupling can be induced at the one-loop level. We examine the size of this induced coupling in the two Higgs doublet model due to fermion as well as Higgs/gauge boson loops. Such couplings could provide a new mechanism for charged Higgs production at colliders and are ‘backgrounds’ to new physics beyond the Standard Model. We find, however, that these couplings are very weak for all regions of the parameter space explored.

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Hou, George Wei-Shu. "CP Violation for the Heavens and the Earth." Universe 8, no. 4 (April 11, 2022): 234. http://dx.doi.org/10.3390/universe8040234.

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Electroweak baryogenesis can be driven by the top quark in a general two Higgs doublet model with extra Yukawa couplings. Higgs quartics provide the first order phase transition, while extra top Yukawa coupling ρtt can fuel the cosmic baryon asymmetry through the λtImρtt product, with flavor-changing ρtc coupling as backup. The impressive ACME 2018 bound on the electron electric dipole moment calls for an extra electron coupling ρee for exquisite cancellation among dangerous diagrams, broadening the baryogenesis solution space. The mechanism suggests that extra Yukawa couplings echo the hierarchical structure of standard Yukawa couplings. Phenomenological consequences in the Higgs search and flavor physics are discussed, with μ and τ EDM touched upon.

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Hou, George Wei-Shu. "On Extra Top Yukawa Couplings of a Second Higgs Doublet." Universe 8, no. 9 (September 9, 2022): 475. http://dx.doi.org/10.3390/universe8090475.

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A very likely New Physics in plain sight, but that the community does not see, is a second Higgs doublet that has a second set of Yukawa couplings. The extra tt and tc couplings can each drive baryogenesis, with O(1) Higgs quartic couplings providing a first order electroweak phase transition. A natural cancellation mechanism can tame electron EDM, if extra ee, tt couplings “know” the known fermion mass and mixing hierarchies. Colliding c with g produces tH/A, bH+ via extra tc coupling, and together with extra tt coupling give ttc(bar), ttt(bar), and btb(bar) signatures at the LHC. Extra tu coupling can also be probed, but more definitive would be the B to μν and τν decay rate ratio. Myriad extra Yukawa couplings can make an impact on flavor physics and CP violation, including on muon g-2. The opening to the prelude of a new physics Higgs and flavor era may unfold before us.

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GONZALEZ-GARCIA, M. C. "ANOMALOUS HIGGS COUPLINGS." International Journal of Modern Physics A 14, no. 20 (August 10, 1999): 3121–56. http://dx.doi.org/10.1142/s0217751x99001494.

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We review the effects of new effective interactions on Higgs-boson phenomenology. New physics in the electroweak bosonic sector is expected to induce additional interactions between the Higgs doublet field and the electroweak gauge bosons, leading to anomalous Higgs couplings as well as anomalous gauge-boson self-interactions. Using a linearly realized SU (2)L× U (1)Y invariant effective Lagrangian to describe the bosonic sector of the Standard Model, we review the effects of the new effective interactions on the Higgs-boson production rates and decay modes. We summarize the results from searches for the new Higgs signatures induced by the anomalous interactions in order to constrain the scale of new physics, in particular at CERN LEP and Fermilab Tevatron colliders.

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Bhagwagar, Azadan, and Raza M. Syed. "Using C++ to Calculate SO(10) Tensor Couplings." Symmetry 13, no. 10 (October 4, 2021): 1871. http://dx.doi.org/10.3390/sym13101871.

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Model building in SO(10), which is the leading grand unification framework, often involves large Higgs representations and their couplings. Explicit calculations of such couplings is a multi-step process that involves laborious calculations that are time consuming and error prone, an issue which only grows as the complexity of the coupling increases. Therefore, there exists an opportunity to leverage the abilities of computer software in order to algorithmically perform these calculations on demand. This paper outlines the details of such software, implemented in C++ using in-built libraries. The software is capable of accepting invariant couplings involving an arbitrary number of SO(10) Higgs tensors, each having up to five indices. The output is then produced in LaTeX, so that it is universally readable and sufficiently expressive. Through the use of this software, SO(10) coupling analysis can be performed in a way that minimizes calculation time, eliminates errors, and allows for experimentation with couplings that have not been computed before in the literature. Furthermore, this software can be expanded in the future to account for similar Higgs–Spinor coupling analysis, or extended to include further SO(N) invariant couplings.

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Han, Xiao-Fang, Lei Wang, and Jin Min Yang. "Higgs pair signal enhanced in the 2HDM with two degenerate 125 GeV Higgs bosons." Modern Physics Letters A 31, no. 31 (September 23, 2016): 1650178. http://dx.doi.org/10.1142/s0217732316501789.

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We discuss a scenario of the type-II two-Higgs-doublet model (2HDM) in which the [Formula: see text] rate of the Higgs pair production is enhanced due to the two nearly degenerate 125 GeV Higgs bosons (h, H). Considering various theoretical and experimental constraints, we figure out the allowed ranges of the trilinear couplings of these two Higgs bosons and calculate the signal rate of [Formula: see text] from the productions of Higgs pairs (hh, hH, HH) at the large hadron collider (LHC). We find that in the allowed parameter space some trilinear Higgs couplings can be larger than the Standard Model (SM) value by an order and the production rate of [Formula: see text] can be greatly enhanced. We also consider a “decoupling” benchmark point where the light CP-even Higgs has a SM-like cubic self-coupling while other trilinear couplings are very small. With a detailed simulation on the [Formula: see text] signal and backgrounds, we find that in such a “decoupling” scenario the hh and hH channels can jointly enhance the statistical significance to 5[Formula: see text] at 14 TeV LHC with an integrated luminosity of 3000 fb[Formula: see text].

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PASUPATHY, J. "A CALCULATION OF HIGGS MASS IN THE STANDARD MODEL." Modern Physics Letters A 15, no. 26 (August 30, 2000): 1605–10. http://dx.doi.org/10.1142/s0217732300002140.

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The assumption that the ratio of the Higgs self-coupling to the square of its Yukawa coupling to the top is (almost) independent of the renormalization scale fixes the Higgs mass within narrow limits at m H =160 GeV using only the values of gauge couplings and top mass.

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9

GUNION, JOHN F. "PROBING EXOTIC HIGGS SECTORS IN ℓ-ℓ- COLLISIONS." International Journal of Modern Physics A 13, no. 14 (June 10, 1998): 2277–97. http://dx.doi.org/10.1142/s0217751x98001074.

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I review extended Higgs sectors and constraints thereon arising from ρ=1, gauge-coupling unification and b→sγ. The couplings and decays of the Higgs boson eigen-states are outlined for triplet representations. Direct experimental probes of exotic Higgs bosons are reviewed with a focus on the important role that would be played by an e-e- or μ-μ- collider.

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10

Chishtie, F. A., M. D. Lepage, D. GC McKeon, T. G. Steele, and I. Zakout. "Exact one-loop running couplings in the standard model." Canadian Journal of Physics 86, no. 9 (September 1, 2008): 1067–70. http://dx.doi.org/10.1139/p08-036.

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Taking the dominant couplings in the standard model to be the quartic scalar coupling, the Yukawa coupling of the top quark, and the SU(3) gauge coupling, we consider their associated running couplings to one-loop order. Despite the nonlinear nature of the differential equations governing these functions, we show that they can be solved exactly. The nature of these solutions is discussed and their singularity structure is examined. It is shown that for a sufficiently small Higgs mass, the quartic scalar coupling decreases with increasing energy scale and becomes negative, indicative of vacuum instability. This behavior changes for a Higgs mass greater than 168 GeV, beyond which this couplant increases with increasing energy scales and becomes singular prior to the ultraviolet pole of the Yukawa coupling. Upper and lower bounds on the Higgs mass corresponding to new physics at the TeV scale are obtained and compare favourably with the numerical results of the one-loop and two-loop analyses with inclusion of electroweak couplings.PACS Nos.: 11.10.Hi, 14.80.Bn

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11

Khosa, Charanjit K., and P. N. Pandita. "Measuring the trilinear neutral Higgs boson couplings in the minimal supersymmetric standard model at e+e− colliders in the light of the discovery of a Higgs boson." International Journal of Modern Physics A 31, no. 18 (June 29, 2016): 1650108. http://dx.doi.org/10.1142/s0217751x16501086.

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We consider the measurement of the trilinear couplings of the neutral Higgs bosons in the minimal supersymmetric standard model (MSSM) at a high energy [Formula: see text] linear collider in the light of the discovery of a Higgs boson at the CERN Large Hadron Collider (LHC). We identify the state observed at the LHC with the lightest Higgs boson [Formula: see text] of the MSSM, and impose the constraints following from this identification, as well as other experimental constraints on the MSSM parameter space. In order to measure trilinear neutral Higgs couplings, we consider different processes where the heavier Higgs boson [Formula: see text] of the MSSM is produced in electron–positron collisions, which subsequently decays into a pair of lighter Higgs boson. We identify the regions of the MSSM parameter space where it may be possible to measure the trilinear couplings of the Higgs boson at a future electron–positron collider. A measurement of the trilinear Higgs couplings is a crucial step in the construction of the Higgs potential, and hence in establishing the phenomena of spontaneous symmetry breaking in gauge theories.

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Kobakhidze, Archil, Adrian Manning, and Jason Yue. "Gravitational waves from the phase transition of a nonlinearly realized electroweak gauge symmetry." International Journal of Modern Physics D 26, no. 10 (August 20, 2017): 1750114. http://dx.doi.org/10.1142/s0218271817501140.

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Within the Standard Model with nonlinearly realized electroweak symmetry, the LHC Higgs boson may reside in a singlet representation of the gauge group. Several new interactions are then allowed, including anomalous Higgs self-couplings, which may drive the electroweak phase transition to be strongly first-order. In this paper, we investigate the cosmological electroweak phase transition in a simplified model with an anomalous Higgs cubic self-coupling. We look at the feasibility of detecting gravitational waves produced during such a transition in the early universe by future space-based experiments. We demonstrate an intriguing interplay between collider measurements of the Higgs self-coupling and these potential gravitational wave measurements. We find that for the range of relatively large cubic couplings, [Formula: see text], [Formula: see text]mHz frequency gravitational waves can be observed by eLISA, while BBO will potentially be able to detect waves in a wider frequency range, [Formula: see text][Formula: see text]mHz.

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13

Cherchiglia, Adriano, Dominik Stöckinger, and Hyejung Stöckinger-Kim. "The muon g – 2 for low-mass pseudoscalar Higgs in the general 2HDM." EPJ Web of Conferences 179 (2018): 01022. http://dx.doi.org/10.1051/epjconf/201817901022.

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The two-Higgs doublet model is a simple and attractive extension of the Standard Model. It provides a possibility to explain the large deviation between theory and experiment in the muon g – 2 in an interesting parameter region: light pseudoscalar Higgs A, large Yukawa coupling to τ-leptons, and general, non-type II Yukawa couplings are preferred. This parameter region is explored, experimental limits on the relevant Yukawa couplings are obtained, and the maximum possible contributions to the muon g – 2 are discussed.

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14

ARANDA, A., J. L. DÍAZ-CRUZ, and A. ROSADO. "ELECTROWEAK–HIGGS UNIFICATION AND THE HIGGS BOSON MASS." International Journal of Modern Physics A 22, no. 07 (March 20, 2007): 1417–40. http://dx.doi.org/10.1142/s0217751x07034283.

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We propose an alternative unification scenario where the Higgs self-coupling (λ) is determined by imposing its unification with the electroweak gauge couplings. An attractive feature of models within this scenario is the possibility to determine the Higgs boson mass by evolving λ from the electroweak–Higgs unification scale M GH down to the electroweak scale. The unification condition for the gauge (g1, g2) and Higgs couplings is written as g1 = g2 = f(λ), where [Formula: see text] being the normalization constant. Two variants for the unification condition are discussed; scenario I is defined through the linear relation: g1 = g2 = kHλ(M GH ), while scenario II assumes a quadratic relation: [Formula: see text]. Fixing kH = O(1) and the standard normalization (kY = 5/3), we obtain a Higgs boson mass value mH ≃ 190 GeV , with similar results for other normalizations such as kY = 7/4 and 3/2. However, the unification scale M GH depends on the value of kY, going from 1.8 ×1012 GeV up to 4.9 ×1014 GeV for 7/4 > kY > 3/2. Possible tests of this idea at a future linear collider and its application for determining the Higgs spectrum in the two-Higgs doublet model are also discussed. We also elaborate on these unification scenarios within the context of a six-dimensional SU (3)c× SU (3)w Gauge–Higgs unified model, where the Higgs boson arises as the extra-dimensional components of the 6D gauge fields.

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15

Fraser, Sean, and Ernest Ma. "Anomalous Higgs Yukawa couplings." EPL (Europhysics Letters) 108, no. 1 (October 1, 2014): 11002. http://dx.doi.org/10.1209/0295-5075/108/11002.

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Giudice, Gian F., and Oleg Lebedev. "Higgs-dependent Yukawa couplings." Physics Letters B 665, no. 2-3 (July 2008): 79–85. http://dx.doi.org/10.1016/j.physletb.2008.05.062.

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DEMIR, D. A. "$gg\rightarrow\gamma\bar ff$ IN THE STRONGLY INTERACTING PHASE OF THE MSSM." Modern Physics Letters A 14, no. 37 (December 7, 1999): 2571–77. http://dx.doi.org/10.1142/s0217732399002698.

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[Formula: see text] scattering is discussed in the strongly interacting phase of the MSSM. The rate for the decay [Formula: see text] is computed in the MSSM and SM, and the values of the Higgs–sfermion coupling needed for the former to dominate on the latter are identified. It is found that the MSSM signal dominates on the SM for Higgs–sfermion couplings well below the one needed for developing stopponium bound states via Higgs mediation.

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GAITÁN, R., E. A. GARCES, O. G. MIRANDA, and J. H. MONTES DE OCA Y. "SCALAR–PSEUDOSCALAR INTERACTIONS IN NEUTRINO–ELECTRON SCATTERING." International Journal of Modern Physics A 28, no. 25 (October 8, 2013): 1350124. http://dx.doi.org/10.1142/s0217751x13501248.

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Many extensions to the Standard Model imply the existence of new charged scalar Higgs bosons. We study the contribution of a general scalar or pseudoscalar coupling for the neutrino–electron scattering. We take a phenomenological approach in order to obtain model independent limits to the couplings that arise in this picture. We illustrate the reach of the constraints by studying the particular case of the type III two Higgs doublet model, where we have found new constraints to some elements of the Yukawa couplings mixing matrix (|Yee| ≤ 1 × 10-1 and |Yeμ| ≤ 7 × 10-2 at 90% CL).

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Kobakhidze, Archil, Lei Wu, and Jason Yue. "Electroweak Baryogenesis with Anomalous Higgs Couplings." International Journal of Modern Physics: Conference Series 43 (January 2016): 1660200. http://dx.doi.org/10.1142/s2010194516602003.

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In non-linear realisation of the electroweak gauge symmetry, the LHC Higgs boson can be assumed to be a singlet under [Formula: see text]. In such scenario, the Standard Model particle content can be kept but new sets of couplings are allowed. We identify a range of anomalous Higgs cubic and the [Formula: see text]-violating Higgs-top quark couplings that leads to first order phase transition and successful baryogenesis at the electroweak scale.

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Telba, Marwa, and Maien Binjonaid. "Impact of LHC Higgs couplings measurements on bosonic decays of the neutral Higgs sector in the scNMSSM." Modern Physics Letters A 36, no. 06 (January 20, 2021): 2150035. http://dx.doi.org/10.1142/s0217732321500358.

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We analyze the Next-to-minimal supersymmetric Standard Model with Grand unification boundary conditions under current theoretical and experimental constraints. We compute the mass spectrum of the model and focus on the three lightest particles in the Higgs sector (two CP-even scalars, [Formula: see text], [Formula: see text] and one CP-odd, [Formula: see text]). The reduced couplings of such particles, singlet-doublet components, their branching ratios to bosons and reduced cross-section to photons and massive gauge bosons via gluon fusion are thoroughly and systematically scrutinized. Our analysis is focused on the parameter space where the singlet-doublet coupling [Formula: see text] is as large as possible (keeping the perturbativity bound intact) and the ratio between the vacuum expectation values of the up-type and down-type Higgses [Formula: see text] is as small as possible, which is the region representing the most natural case of the NMSSM. We show the impact of recent constraints from the LHC on the SM-Higgs couplings to bosons and fermions on the parameter space of the model and the consequent implications on the Higgs sector. The results show that while the model is still able to account for current data, and provide an opportunity for discovery of extended Higgs sectors, recent LHC Higgs couplings constraints rule-out parts of the parameter space where [Formula: see text] (non-SM-like) and [Formula: see text] are non-singlet with masses below 400 GeV.

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Batebi, S., M. Haghighat, S. Tizchang, and H. Akafzade. "Higgs couplings in noncommutative Standard Model." International Journal of Modern Physics A 30, no. 20 (July 19, 2015): 1550108. http://dx.doi.org/10.1142/s0217751x15501080.

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We consider the Higgs and Yukawa parts of the Noncommutative Standard Model (NCSM). We explore the NC-action to give all Feynman rules for couplings of the Higgs boson to electroweak gauge fields and fermions.

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22

Dick, Rainer. "Direct signals from electroweak singlets through the Higgs portal." International Journal of Modern Physics D 27, no. 16 (December 2018): 1830008. http://dx.doi.org/10.1142/s0218271818300082.

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We review predictions and constraints for nuclear recoil signals from Higgs portal dark matter under the assumption of standard thermal creation from freeze-out. Thermally created scalar and vector Higgs portal dark matter masses are constrained to be in the resonance region near half the Higgs mass, [Formula: see text], or above several TeV. The resonance region for these models will be tested by XENONnT and LZ. The full mass range up to the unitarity limit can be tested by DarkSide-20k and DARWIN. Fermionic Higgs portal dark matter with a pure CP odd coupling is constrained by the Higgs decay width, but has strongly suppressed recoil cross sections which cannot be tested with upcoming experiments. Fermionic Higgs portal dark matter with a combination of CP even and odd Higgs couplings can be constrained by the direct search experiments.

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23

Plehn, Tilman, and Michael Rauch. "Higgs couplings after the discovery." EPL (Europhysics Letters) 100, no. 1 (October 1, 2012): 11002. http://dx.doi.org/10.1209/0295-5075/100/11002.

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Djouadi, A., W. Kilian, M. Mühlleitner, and P. M. Zerwas. "Testing Higgs self-couplings at." European Physical Journal C 10, no. 1 (1999): 27. http://dx.doi.org/10.1007/s100520050570.

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25

Bian, Ligong, Ning Chen, and Yun Jiang. "Higgs pair production in the CP-violating two-Higgs-doublet model." International Journal of Modern Physics A 32, no. 34 (December 10, 2017): 1746002. http://dx.doi.org/10.1142/s0217751x17460022.

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The SM-like Higgs pair production is discussed in the framework of the general CP-violating two-Higgs-doublet model, where we find that the CP-violating mixing angles can be related to the Higgs self-couplings. Therefore, the future experimental searches for Higgs boson pairs can be constrained by the improved precision of the electric dipole moment measurements. Based on a series of constraints of the SM-like Higgs boson signal fits, the perturbative unitarity and stability bounds to the Higgs potential, and the most recent LHC searches for heavy Higgs bosons, we suggest a set of benchmark models for the future high-energy collider searches for Higgs pair production. The [Formula: see text] colliders operating at [Formula: see text] are capable of measuring the Higgs cubic self-couplings of the benchmark models directly. We also estimate the cross sections of the resonance contributions to the Higgs pair productions for the benchmark models at the future LHC and SppC/FCC-hh runs.

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GUNION, JOHN F. "PROBING LEPTON-NUMBER-VIOLATING COUPLINGS OF DOUBLY-CHARGED HIGGS BOSONS AT AN e−e− COLLIDER." International Journal of Modern Physics A 11, no. 09 (April 10, 1996): 1551–62. http://dx.doi.org/10.1142/s0217751x96000730.

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The doubly charged Higgs bosons Δ−− that are present in exotic Higgs representations can have lepton-number-violating couplings to e−e−. We discuss general constraints and phenomenology for the Δ−− and demonstrate that extremely small values for the e−e−→Δ−− coupling-squared (some 8 orders of magnitude smaller than the current limit) would produce observable signals for Δ−− production in direct s-channel production at an e−e− collider.

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Modak, Tanmoy, and Rahul Srivastava. "Probing anomalous Higgs couplings in H → ZV decays." Modern Physics Letters A 32, no. 03 (January 11, 2017): 1750004. http://dx.doi.org/10.1142/s0217732317500043.

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We analyze the possibility of probing anomalous Higgs couplings in the rare decays H [Formula: see text] ZV, V being a vector quarkonium state. These rare decays involve both gauge as well as the Yukawa sectors and either of them can potentially be anomalous. We show that the branching fractions for H [Formula: see text] ZV decays in Standard Model (SM) are small, making it a sensitive probe for anomalous Higgs couplings originating from physics beyond SM. Moreover, as both V and Z can decay into pair of charged leptons, they provide experimentally clean channels and future LHC runs should observe such decays. We perform a model independent analysis and show how angular asymmetries can be used to probe these anomalous Higgs couplings, taking further decays of V and Z to pair of charged leptons into account. The angular asymmetries can provide significant information about anomalous Higgs couplings in both gauge and Yukawa sectors.

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Belyaev, Nikita. "Measurement of cross sections and couplings of the Higgs Boson in bosonic decay channels with the ATLAS detector." EPJ Web of Conferences 182 (2018): 02013. http://dx.doi.org/10.1051/epjconf/201818202013.

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After the discovery of the Higgs boson, the measurement of its properties are of particular importance. In this paper, measurement of the cross sections and couplings of the Higgs boson in bosonic decay channels with the ATLAS detector are presented. Previous measurements of the spin and parity of this new particle, as well as the investigation of its couplings to other SM particles, revealed no significant deviations from the corresponding predictions for the Standard Model Higgs boson. In the years 2015-2017, the centre-of-mass energy √s and the integrated luminosity of the Large Hadron Collider was increased up to 13 TeV and 36.1 fb-1, respectively. With this improvements of the LHC, the properties of recently discovered Higgs boson can be studied in more details. In this paper, latest updates on cross sections and couplings analyses of the Higgs Boson are presented. The discussion will focus on the recent results obtained by the ATLAS collaboration in γγ and 4l Higgs boson decay channels as well as their combination.

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Gopalakrishna, Shrihari, and Tuhin Subhra Mukherjee. "Gauge-Singlet Vector-Like Fermion Dark Matter, LHC Diphoton Rate, and Direct Detection." Advances in High Energy Physics 2017 (2017): 1–14. http://dx.doi.org/10.1155/2017/8689270.

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We study a gauge-singlet vector-like fermion hidden sector dark matter model, in which the communication between the dark matter and the visible standard model sector is via the Higgs-portal scalar-Higgs mixing and also via a hidden sector scalar with loop-level couplings to two gluons and also to two hypercharge gauge bosons induced by a vector-like quark. We find that the Higgs-portal possibility is stringently constrained to be small by the recent LHC di-Higgs search limits, and the loop induced couplings are important to include. In the model parameter space, we present the dark matter relic density, the dark-matter-nucleon direct detection scattering cross section, the LHC diphoton rate from gluon-gluon fusion, and the theoretical upper bounds on the fermion-scalar couplings from perturbative unitarity.

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SIEGEMUND-BROKA, STEPHAN. "THE EFFECTIVE ACTION FOR COMPOSITE HIGGS PARTICLES." International Journal of Modern Physics A 07, no. 30 (December 10, 1992): 7561–78. http://dx.doi.org/10.1142/s0217751x92003422.

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There is reason to believe that massive composite (fermion-antifermion) scalar particles closely resembling the usual fundamental scalar Higgs fields exist in theories with dynamically broken gauge symmetries. This composite Higgs couples directly to the fermions in proportion to their symmetry-violating self-energies. Induced couplings to the gauge bosons and self-couplings are calculated as loop effects. This involves deriving the effective action in terms of the full propagators and background fields. The couplings between the composite Higgs and the gauge bosons are the same as those in models with fundamental scalars. The self-couplings are determined and fix all parameters associated with the composite scalars. Comments regarding extending this work to higher orders and concerning the symmetry-violating solutions to the fermion Schwinger-Dyson equation are given.

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Tallarita, Gianni, and Moritz McGarrie. "Super-Higgs in Superspace." Physics 1, no. 1 (June 14, 2019): 167–82. http://dx.doi.org/10.3390/physics1010016.

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We determine the effective gravitational couplings in superspace whose components reproduce the supergravity Higgs effect for the constrained Goldstino multiplet. It reproduces the known Gravitino sector while constraining the off-shell completion. We show that these couplings arise by computing them as quantum corrections. This may be useful for phenomenological studies and model-building. We give an example of its application to multiple Goldstini.

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FROGGATT, C. D., R. NEVZOROV, H. B. NIELSEN, and D. THOMPSON. "ON THE ORIGIN OF APPROXIMATE CUSTODIAL SYMMETRY IN THE TWO-HIGGS DOUBLET MODEL." International Journal of Modern Physics A 24, no. 30 (December 10, 2009): 5587–637. http://dx.doi.org/10.1142/s0217751x09047442.

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We argue that the consistent implementation of the multiple point principle (MPP) in the general nonsupersymmetric two-Higgs doublet model (2HDM) can lead to a set of approximate global custodial symmetries that ensure CP conservation in the Higgs sector and the absence of flavor changing neutral currents (FCNC) in the considered model. In particular, the existence of a large set of degenerate vacua at some high energy scale Λ caused by the MPP can result in approximate U(1) and Z2 symmetries that suppress FCNC and CP-violating interactions in the 2HDM. We explore the renormalization group (RG) flow of the Yukawa and Higgs couplings within the MPP inspired 2HDM with approximate custodial symmetries and show that the solutions to the RG equations are focused near quasifixed points at low energies if the MPP scale Λ is relatively high. We study the Higgs spectrum and couplings near the quasifixed point at moderate values of tan β and compute a theoretical upper bound on the lightest Higgs boson mass. If Λ ≳ 1010 GeV the lightest CP-even Higgs boson is always lighter than 125 GeV. When the MPP scale is low, the mass of the lightest Higgs particle can reach 180–220 GeV while its coupling to the top quark can be significantly larger than in the SM, resulting in the enhanced production of Higgs bosons at the LHC. Other possible scenarios that appear as a result of the implementation of the MPP in the 2HDM are also discussed.

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FUKUYAMA, TAKESHI, TATSURU KIKUCHI, and NOBUCHIKA OKADA. "THE CURRENT PROBLEMS OF THE MINIMAL SO(10) GUT AND THEIR SOLUTIONS." International Journal of Modern Physics E 16, no. 05 (June 2007): 1489–503. http://dx.doi.org/10.1142/s0218301307006836.

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This talk consists of two parts. In part I we review how the minimal renormalizable supersymmetric SO (10) model, an SO (10) framework with only one 10 and one [Formula: see text] Higgs multiplets in the Yukawa sector, is attractive because of its highly predictive power. Indeed it not only gives a consistent predictions on neutrino oscillation data but also gives reasonable and interesting values for leptogenesis, LFV, muon g - 2, neutrinoless double beta decay etc. However, this model suffers from problems related to running of gauge couplings. The gauge coupling unification may be spoiled due to the presence of Higgs multiplets much lighter than the grand unification (GUT) scale. In addition, the gauge couplings blow up around the GUT scale because of the presence of Higgs multiplets of large representations. In part II we consider the minimal SO (10) model in the warped extra dimension and show a possibility to solve these problems.

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Dordevic, Milos. "Higgs physics at CMS." EPJ Web of Conferences 222 (2019): 01001. http://dx.doi.org/10.1051/epjconf/201922201001.

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The most recent results of a Higgs boson production and properties from the CMS Collaboration using the LHC Run 1 and Run 2 data are reported. These include analyses of a Higgs boson decaying to a pair of photons, four leptons via Z boson pair decays and the associated production of a Higgs boson with top quark pair, predicted by the Standard Model (SM). The studies of a Higgs boson decays to a pair of bottom quarks, a pair of tau leptons and a charm quark pair are also presented. The Higgs boson production via vector boson fusion (VBF) and decaying to invisible particles is reported here as well. The analysis of a Higgs boson decay to a pair of muons is also presented. The study of a Higgs boson pair production at 13 TeV is performed as well and projections of a Higgs boson self couplings together with the couplings to other particles at the HL-LHC are made.

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Ahmed, Ijaz, Ujala Nawaz, Taimoor Khurshid, and Shamona Fawad Qazi. "Probing Triple Higgs Self-Coupling and Effect of Beam Polarization in Lepton Colliders." Advances in High Energy Physics 2022 (July 6, 2022): 1–20. http://dx.doi.org/10.1155/2022/9735729.

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One of the main objectives of almost all future (lepton) colliders is to measure the self-coupling of triple Higgs in the Standard Model. By elongating the Standard Model’s scalar sector, using incipient Higgs doublet along with a quadratic (Higgs) potential can reveal many incipient features of the model and the possibility of the emergence of additional Higgs self-couplings. The self-coupling of the Higgs boson helps in reconstructing the scalar potential. The main objective of this paper is to extract Higgs self-coupling by numerically analyzing several scattering processes governed by two Higgs doublet models (2HDM). These scattering processes include various possible combinations of final states in the triple Higgs sector. The determination of production cross-section of scattering processes is carried out using two different scenarios, one with and other without polarization of incoming beam, and is extended to a center of mass energy up to s = 3 TeV . The computation is carried out in type-1 2HDM. Here, we consider the case of exact alignment limit ( s β α =1) and masses of extra Higgs states are equal, that is, m H = m H 0 = m A 0 = m H ± . This choice minimizes the oblique parameters. The decays of the final state of each process are investigated to estimate the number of events at an integrated luminosity of 1 a b − 1 and 3 a b − 1 .

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HAN, XIAO-FANG, LEI WANG, and FENG ZHANG. "AN ALTERNATIVE IMPLEMENTATION OF T-PARITY IN FERMION SECTOR AND THE CHANNEL $VV\to h\to\tau\bar{\tau}$ AT LHC." Modern Physics Letters A 26, no. 27 (September 7, 2011): 2079–89. http://dx.doi.org/10.1142/s0217732311036322.

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We modify the implementation of T-parity in the fermion sector (called LHT-III), where the mixing of top quark and T-even partner can be absent, and the Higgs mass quadratic divergence contributed by the top quark and a T-odd partner cancel each other. Besides, the Yukawa couplings of down-type quarks and leptons can be enhanced in this model, while these couplings are suppressed in other little Higgs models. Finally, we study the channel [Formula: see text] at LHC in several typical little Higgs models, and find that the rate in all these little Higgs models can have a sizable deviation from the SM prediction, especially for that the rate can only be enhanced in LHT-III, but suppressed in other little Higgs models. Therefore, the Higgs production process [Formula: see text] at LHC can provide a powerful way to probe these little Higgs models, especially for distinguishing the LHT-III from other little Higgs models.

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ÇAKIR, I. T., O. ÇAKIR, A. SENOL, and A. T. TASCI. "PROBING ANOMALOUS HZZ COUPLINGS AT THE LHeC." Modern Physics Letters A 28, no. 31 (September 25, 2013): 1350142. http://dx.doi.org/10.1142/s0217732313501423.

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We examine the sensitivity to anomalous couplings of the Higgs boson to neutral gauge bosons in a model-independent way at the Large Hadron electron Collider (LHeC). We have obtained the constraints on anomalous couplings for HZZ vertex via the process e-p→e-HqX. We find the accessible limits on the CP-conserving coupling bZ as (-0.12,0.43) and (-0.10,0.33), while the limits on CP-violating coupling βZ as (-0.32,0.32) and (-0.24,0.24) at the electron beam energy Ee = 60 GeV and Ee = 140 GeV , respectively.

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He, Dan, Tai-Fu Feng, Jin-Lei Yang, Guo-Zhu Ning, Hai-Bin Zhang, and Xing-Xing Dong. "Pair production of neutral Higgs particles in the B-LSSM." Journal of Physics G: Nuclear and Particle Physics 49, no. 8 (June 30, 2022): 085002. http://dx.doi.org/10.1088/1361-6471/ac77a8.

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Abstract Higgs pair production provides a unique handle for measuring the strength of Higgs self interaction and constraining the shape of the Higgs potential. Including radiative corrections to the trilinear couplings of CP-even Higgs, we investigate the cross section of the lightest neutral Higgs pair production in gluon fusion at the Large Hadron Collider in the supersymmetric extensions of the standard model. Numerical results indicate that the correction to the cross section is about 11% in the B-LSSM, while is only about 4% in the MSSM. Considering the constraints of the experimental data of the lightest Higgs, we find that the gauge couplings of U(1) B–L and the ratio of the nonzero vacuum expectation values of two singlets also affect strongly the theoretical evaluations on the production cross section in the B-LSSM.

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DAS, MOUMITA, and SUBHENDRA MOHANTY. "GENERATION OF SCALE INVARIANT DENSITY PERTURBATIONS IN A CONFORMALLY INVARIANT INERT HIGGS DOUBLET MODEL." International Journal of Modern Physics A 28, no. 19 (July 30, 2013): 1350094. http://dx.doi.org/10.1142/s0217751x13500942.

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If a Higgs field is conformally coupled to gravity, then it can give rise to the scale invariant density perturbations. We make use of this result in a realistic inert Higgs doublet model, where we have a pair of Higgs doublets conformally coupled to the gravity in the early universe. The perturbation of the inert Higgs is shown to be the scale invariant. This gives rise to the density perturbation observed through CMB by its couplings to the standard model Higgs and the subsequent decay. Loop corrections of this conformally coupled system gives rise to electroweak symmetry breaking. We constrain the couplings of the scalar potential by comparing with the amplitude and spectrum of CMB anisotropy measured by WMAP and this model leads to a prediction for the masses of the lightest Higgs and the other scalars.

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Steggemann, Jan. "Extended Scalar Sectors." Annual Review of Nuclear and Particle Science 70, no. 1 (October 19, 2020): 197–223. http://dx.doi.org/10.1146/annurev-nucl-032620-043846.

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Extended scalar sectors appear in various extensions of the Standard Model of particle physics, such as supersymmetric models. They are also generic extensions of the Standard Model and can address a number of its shortcomings. Direct searches for additional Higgs bosons and measurements of the 125-GeV Higgs boson, both of which provide insights into the different possible sectors, are carried out at the LHC. This review gives an overview of searches for the additional Higgs bosons and their implications for different models. The discussed analyses comprise searches for neutral and charged Higgs bosons that decay in various final states. In addition, the review summarizes the constraints from precision measurements, including in particular the observed couplings of the 125-GeV Higgs boson. While several models naturally incorporate a Higgs boson with couplings that are similar to the ones in the Standard Model, the measurements of the 125-GeV Higgs boson provide constraints on all considered extensions.

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BOZ, MÜGE. "THE CONSTRAINTS ON CP VIOLATING PHASES IN MODELS WITH A DYNAMICAL GLUINO PHASE." Modern Physics Letters A 19, no. 06 (February 28, 2004): 433–48. http://dx.doi.org/10.1142/s0217732304013027.

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We analyze the electric dipole moment and the Higgs mass constraints on the supersymmetric model which offers dynamical solutions to the μ and strong CP problems. The trilinear coupling phases, and tan β-|μ| are strongly correlated, particularly in the low-tan β regime. Certain values of the phases of the trilinear couplings are forbidden, whereas the CP violating phase from the chargino sector is imprisoned to lie near a CP conserving point, by the Higgs mass and electric dipole moment constraints.

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MOROI, TAKEO, and YASUHIRO OKADA. "RADIATIVE CORRECTIONS TO HIGGS MASSES IN THE SUPERSYMMETRIC MODEL WITH AN EXTRA FAMILY AND ANTI-FAMILY." Modern Physics Letters A 07, no. 03 (January 30, 1992): 187–99. http://dx.doi.org/10.1142/s0217732392000124.

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Radiative corrections to Higgs masses are calculated in a supersymmetric standard model with an extra family and its mirror partners. These corrections, in general, depend on the mass spectrum of fermions, bosons and the strength of Yukawa couplings of the extra families. If we assume that the Yukawa couplings do not blow up below the GUT scale, the upper bound of the lightest Higgs mass increases about 12 GeV. We also notice that, in some cases, the charged Higgs mass becomes lighter than that of the tree level prediction.

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García-Bellido, Juan. "Signatures of Higgs dilaton and critical Higgs inflation." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 376, no. 2114 (January 22, 2018): 20170119. http://dx.doi.org/10.1098/rsta.2017.0119.

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We test the Higgs dilaton inflation model (HDM) using the latest cosmological datasets, including the cosmic microwave background temperature, polarization and lensing data from the Planck satellite (2015), the BICEP and Keck Array experiments, the type Ia supernovae from the JLA catalogue, the baryon acoustic oscillations from CMASS, LOWZ and 6dF, the weak lensing data from the CFHTLenS survey and the matter power spectrum measurements from the latest SDSS data release. We find that the values of all cosmological parameters allowed by the HDM are well within the Planck satellite (2015) constraints. In particular, we determine , , , and (at 95.5% c.l.). We also place new stringent constraints on the couplings of the HDM, ξ χ <0.00328 and (at 95.5% c.l.). We find that the HDM is only slightly better than the w 0 w a CDM model, with . Given that the HDM has two fewer parameters, we find Bayesian evidence favouring the HDM over the w 0 w a CDM model. We also study the critical Higgs inflation model, taking into account the running of both the self-coupling λ( μ ) and the non-minimal coupling to gravity ξ ( μ ). We find peaks in the curvature power spectrum at scales corresponding to the critical value μ that re-enter during the radiation era and collapse to form a broad distribution of clustered primordial black holes, which could constitute today the main component of dark matter. This article is part of the Theo Murphy meeting issue ‘Higgs cosmology’.

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Antusch, Stefan, Eros Cazzato, and Oliver Fischer. "Higgs production through sterile neutrinos." International Journal of Modern Physics A 31, no. 33 (November 22, 2016): 1644007. http://dx.doi.org/10.1142/s0217751x16440073.

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In scenarios with sterile (right-handed) neutrinos with an approximate “lepton-number-like” symmetry, the heavy neutrinos (the mass eigenstates) can have masses around the electroweak scale and couple to the Higgs boson with, in principle, unsuppressed Yukawa couplings, while the smallness of the light neutrinos’ masses is guaranteed by the approximate symmetry. The on-shell production of the heavy neutrinos at lepton colliders, together with their subsequent decays into a light neutrino and a Higgs boson, constitutes a resonant contribution to the Higgs production mechanism. This resonant mono-Higgs production mechanism can contribute significantly to the mono-Higgs observables at future lepton colliders. A dedicated search for the heavy neutrinos in this channel exhibits sensitivities for the electron neutrino Yukawa coupling as small as [Formula: see text]. Furthermore, the sensitivity is enhanced for higher center-of-mass energies, when identical integrated luminosities are considered.

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LORENZO DÍAZ-CRUZ, J. "TRACING THE GAUGE ORIGIN OF YUKAWA AND HIGGS PARAMETERS BEYOND THE STANDARD MODEL." Modern Physics Letters A 20, no. 31 (October 10, 2005): 2397–408. http://dx.doi.org/10.1142/s0217732305017949.

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We discuss possible realizations of the hypothesis that all the fundamental interactions of the elementary particles should be of gauge type, including the Yukawa and Higgs ones. In the minimal SUSY extension of the standard model, where the quartic Higgs couplings are "gauged" through the D-terms, it is also possible to generate radiatively the Yukawa matrices for the light generations, thus expressing them as functions of gauge couplings. The program can also be applied to the SUSY LR model, where the possibility to induce radiatively the mixing angles, can help to make viable the parity solution to the strong CP problem. The superpotential of the model still includes some non-gauge couplings, namely, the Yukawa constants for the third generation and the trilinear terms λχ L Φχ R and [Formula: see text], involving the Higgs bi-doublet (Φ) and two pairs of doublets (χ L , χ R and their conjugates). Additional progress to relate these parameters to gauge couplings, can be made by embedding the LR model within a SUSY model SU (4)W× U (1)B-L in five dimensions, where the Higgs bi-doublet is identified as the extra component of the 5D gauge field.

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Cline, James M. "Is electroweak baryogenesis dead?" Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 376, no. 2114 (January 22, 2018): 20170116. http://dx.doi.org/10.1098/rsta.2017.0116.

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Electroweak baryogenesis is severely challenged in its traditional settings: the minimal supersymmetric standard model, and in more general two Higgs doublet models. Fine tuning of parameters is required, or large couplings leading to a Landau pole at scales just above the new physics introduced. The situation is somewhat better in models with a singlet scalar coupling to the Higgs so as to give a strongly first-order phase transition due to a tree-level barrier, but even in this case no UV complete models had been demonstrated to give successful baryogenesis. Here, we point out some directions that overcome this limitation, by introducing a new source of particle–antiparticle (CP) violation in the couplings of the singlet field. A model of electroweak baryogenesis requiring no fine tuning and consistent to scales far above 1 TeV is demonstrated, in which dark matter plays the leading role in creating a CP asymmetry that is the source of the baryon asymmetry. This article is part of the Theo Murphy meeting issue ‘Higgs cosmology’.

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Sanz, Veronica, and Jack Setford. "Composite Higgs Models after Run 2." Advances in High Energy Physics 2018 (2018): 1–8. http://dx.doi.org/10.1155/2018/7168480.

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We assess the status of models in which Higgs is a composite pseudo-Nambu Goldstone boson, in the light of the latest 13 TeV Run 2 Higgs data. Drawing from the extensive Composite Higgs literature, we collect together predictions for the modified couplings of Higgs, in particular examining the different predictions for κV and κF. Despite the variety and increasing complexity of models on the market, we point out that many independent models make identical predictions for these couplings. We then look into further corrections induced by tree-level effects such as mass-mixing and singlet VEVs. We then investigate the compatibility of different models with the data, combining Run 1 and recent Run 2 LHC data. We obtain a robust limit on the scale f of 600 GeV, with stronger limits for different choices of fermion embeddings. We also discuss how a deficit in a Higgs channel could pinpoint the type of Composite Higgs model responsible for it.

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Asner, David. "Prospect for Discovering H0, A0 in Two-Photon Collisions at a Linear Collider." International Journal of Modern Physics A 18, no. 16 (June 30, 2003): 2893–902. http://dx.doi.org/10.1142/s0217751x03016355.

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We examine the potential for detecting and studying Higgs bosons in two-photon collisions at a future linear collider. Our study incorporates realistic two-photon spectra based on the most probable available laser technology. We study the cases of a) the heavy MSSM Higgs bosons and b) a Higgs boson with no WW/ZZ couplings from a general two Higgs doublet model.

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Ouseph, C. J., and Kingman Cheung. "Higgs Inflation with four-form couplings." Journal of Physics G: Nuclear and Particle Physics 48, no. 5 (April 8, 2021): 055001. http://dx.doi.org/10.1088/1361-6471/abefa4.

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Arco, F., S. Heinemeyer, and M. J. Herrero. "Triple Higgs couplings in the 2HDM: the complete picture." European Physical Journal C 82, no. 6 (June 2022). http://dx.doi.org/10.1140/epjc/s10052-022-10485-9.

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AbstractThe measurement of the triple Higgs coupling is one of the main tasks of the (HL-)LHC and future lepton colliders. Similarly, triple Higgs couplings involving BSM Higgs bosons are of high interest. Within the framework of Two Higgs Doublet Models (2HDM) we investigate the allowed ranges for all triple Higgs couplings involving at least one light, SM-like Higgs boson. We present newly the allowed ranges for 2HDM type III and IV and update the results within the type I and II. We take into account theoretical constraints from unitarity and stability, experimental constraints from direct BSM Higgs-boson searches, measurements of the rates of the SM-like Higgs-boson at the LHC, as well as flavor observables and electroweak precision data. For the SM-type triple Higgs coupling w.r.t. its SM value, $$\lambda _{hhh}/\lambda _{\mathrm{SM}}$$ λ hhh / λ SM , we find allowed intervals of $$\sim [{-0.5}, {1.3}]$$ ∼ [ - 0.5 , 1.3 ] in type I and $$\sim [{0.5}, {1.0}]$$ ∼ [ 0.5 , 1.0 ] in the other Yukawa types. These allowed ranges have important implications for the experimental determination of this coupling at future collider experiments. We find the coupling $$\lambda _{hhH}$$ λ hhH between $$\sim -1.5$$ ∼ - 1.5 and $$\sim +1.5$$ ∼ + 1.5 in the four Yukawa types. For the triple Higgs couplings involving two heavy neutral Higgs bosons, $$\lambda _{hHH}$$ λ hHH and $$\lambda _{hAA}$$ λ hAA we find values between $$\sim -0.5$$ ∼ - 0.5 and $$\sim 16$$ ∼ 16 , and between $$\sim -1$$ ∼ - 1 and $$\sim 32$$ ∼ 32 for $$\lambda _{hH^+H^-}$$ λ h H + H - . These potentially large values could lead to strongly enhanced production of two Higgs-bosons at the HL-LHC or high-energy lepton colliders.

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Journal articles on the topic 'Higgs couplings'

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