scholarly journals Prospects for direct searches for light Higgs bosons at the ILC with 250 GeV

2020 ◽  
Vol 80 (10) ◽  
Author(s):  
P. Drechsel ◽  
G. Moortgat-Pick ◽  
G. Weiglein
Keyword(s):  
Higgs Boson ◽  
Higgs Sector ◽  
Higgs Bosons ◽  
Gauge Bosons ◽  
Light Higgs Boson ◽  
Lepton Colliders ◽  
Order Of Magnitude ◽  
Model Independent ◽  
Extended Higgs Sector ◽  
Higgs Fields

AbstractThe particle discovered in the Higgs boson searches at the LHC with a mass of about 125 GeV is compatible within the present uncertainties with the Higgs boson predicted in the Standard Model (SM), but it could also be identified with one of the neutral Higgs bosons in a variety of beyond the SM (BSM) theories with an extended Higgs sector. The possibility that an additional Higgs boson (or even more than one) could be lighter than the state that has been detected at 125 GeV occurs generically in many BSM models and has some support from slight excesses that were observed above the background expectations in Higgs searches at LEP and at the LHC. The couplings between additional Higgs fields and the electroweak gauge bosons in BSM theories could be probed by model-independent Higgs searches at lepton colliders. We present a generator-level extrapolation of the limits obtained at LEP to the case of a future $$e^+e^-$$ e + e - collider, both for the search where the light Higgs boson decays into a pair of bottom quarks and for the decay-mode-independent search utilising the recoil method. We find that at the ILC with a centre-of-mass energy of 250 GeV, an integrated luminosity of 500 fb$$^{-1}$$ - 1 and polarised beams, the sensitivity to a light Higgs boson with reduced couplings to gauge bosons is improved by more than an order of magnitude compared to the LEP limits and goes much beyond the projected indirect sensitivity of the HL-LHC with 3000 fb$$^{-1}$$ - 1 from the rate measurements of the detected state at 125 GeV.

scholarly journals HL-LHC and ILC sensitivities in the hunt for heavy Higgs bosons

2020 ◽  
Vol 80 (10) ◽  
Author(s):  
Henning Bahl ◽  
Philip Bechtle ◽  
Sven Heinemeyer ◽  
Stefan Liebler ◽  
Tim Stefaniak ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Linear Collider ◽  
Hadron Collider ◽  
International Linear Collider ◽  
Higgs Sector ◽  
Higgs Bosons ◽  
Beyond The Standard Model ◽  
The Future ◽  
Extended Higgs Sector

AbstractThe prediction of additional Higgs bosons is one of the key features of physics beyond the Standard Model (SM) that gives rise to an extended Higgs sector. We assess the sensitivity of the Large Hadron Collider (LHC) in the high luminosity (HL) run alone and in combination with a possible future International Linear Collider (ILC) to probe heavy neutral Higgs bosons. We employ the Minimal Supersymmetric Standard Model (MSSM) as a framework and assume the light $$\mathcal {CP}$$ CP -even MSSM Higgs boson to be the Higgs boson observed at $$125\,\mathrm{GeV}$$ 125 GeV . We discuss the constraints on the MSSM parameter space arising from the precision measurements of the rates of the detected signal at $$125\,\mathrm{GeV}$$ 125 GeV and from direct searches for new heavy Higgs bosons in the $$\tau ^+\tau ^-$$ τ + τ - , $$b\bar{b}$$ b b ¯ and di-Higgs (hh) final states. A new benchmark scenario for heavy Higgs searches in the $$b\bar{b}$$ b b ¯ channel is proposed in this context. For the future Higgs rate measurements at the HL-LHC and ILC two different scenarios are investigated, namely the case where the future rate measurements agree with the SM prediction and the case where the rates agree with the predictions of possible realizations of the MSSM Higgs sector in nature.

HIGGS MASSES AND COUPLING WITHIN AN EXTENSION OF THE MSSM WITH HIGGS TRIPLETS

2002 ◽  
Vol 17 (04) ◽  
pp. 465-486 ◽  
Author(s):  
OLGA FÉLIX-BELTRÁN
Keyword(s):  
Higgs Boson ◽  
Effective Potential ◽  
Mass Difference ◽  
Higgs Sector ◽  
Higgs Bosons ◽  
Radiative Corrections ◽  
Gauge Bosons ◽  
The One ◽  
Susy Model

We study the properties of the Higgs sector in an extended SUSY model that includes a complex (Y=0) Higgs triplet. In particular, we evaluate the Higgs masses and their couplings to gauge bosons, including the leading radiative corrections using the one-loop effective potential. The mass difference between the CP-even and CP-odd neutral scalars, which can mimic a CP-violating Higgs signature of the MSSM, is also studied. Then, we study the range of parameters that are bounded from the LEP2 search for neutral Higgs bosons, as well as the corresponding region where at least one of the neutral CP-even Higgs boson can be detected at a future e+e- collider with a c.m. energy of 500 GeV.

scholarly journals Resolving the (g − 2)μ discrepancy with $$ \mathcal{F} $$–SU(5) intersecting D-branes

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Joseph L. Lamborn ◽  
Tianjun Li ◽  
James A. Maxin ◽  
Dimitri V. Nanopoulos
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Model Building ◽  
Rare Decay ◽  
Model Space ◽  
Higgs Sector ◽  
Boson Mass ◽  
Light Higgs Boson ◽  
Brane Model ◽  
Extended Higgs Sector

Abstract A discrepancy between the measured anomalous magnetic moment of the muon (g − 2)μ and computed Standard Model value now stands at a combined 4.2σ following experiments at Brookhaven National Lab (BNL) and the Fermi National Accelerator Laboratory (FNAL). A solution to the disagreement is uncovered in flipped SU(5) with additional TeV-Scale vector-like 10 + $$ \overline{\mathbf{10}} $$ 10 ¯ multiplets and charged singlet derived from local F-Theory, collectively referred to as $$ \mathcal{F} $$ F –SU(5). Here we engage general No-Scale supersymmetry (SUSY) breaking in $$ \mathcal{F} $$ F –SU(5) D-brane model building to alleviate the (g −2)μ tension between the Standard Model and observations. A robust ∆aμ(SUSY) is realized via mixing of M5 and M1X at the secondary SU(5) × U(1)X unification scale in $$ \mathcal{F} $$ F –SU(5) emanating from SU(5) breaking and U(1)X flux effects. Calculations unveil ∆aμ(SUSY) = 19.0–22.3 × 10−10 for gluino masses of M($$ \overset{\sim }{g} $$ g ~ )= 2.25–2.56 TeV and higgsino dark matter, aptly residing within the BNL+FNAL 1σ mean. This (g − 2)μ favorable region of the model space also generates the correct light Higgs boson mass and branching ratios of companion rare decay processes, and is further consistent with all LHC Run 2 constraints. Finally, we also examine the heavy SUSY Higgs boson in light of recent LHC searches for an extended Higgs sector.

SUPERSYMMETRIC MODELS WITH EXTENDED HIGGS SECTOR

1989 ◽  
Vol 04 (14) ◽  
pp. 3635-3651 ◽  
Author(s):  
MANUEL DREES
Keyword(s):  
Higgs Boson ◽  
Higgs Sector ◽  
Higgs Doublet ◽  
Charged Higgs Boson ◽  
Higgs Bosons ◽  
Supersymmetric Model ◽  
Neutral Scalar ◽  
Supersymmetric Models ◽  
Charged Higgs ◽  
Extended Higgs Sector

The Higgs sector of supersymmetric models with an additional SU (2)× U (1)Y singlet or an additional pair of Higgs doublet superfields is investigated. It is shown that in the model with a Higgs singlet bounds on Higgs boson masses are considerably weaker than in the minimal supersymmetric model; in particular, all neutral scalars can be heavier than about 150 GeV or lighter than [Formula: see text], whereas the mass of the charged Higgs boson is essentially unconstrained. The four doublet model resembles the minimal model more closely; in particular, the bounds for the heaviest and lightest neutral scalar and the heaviest charged Higgs boson are unaltered. In this model, many relations between masses of different Higgs bosons can be found; 44 of the 66 possible decays of one Higgs boson into another Higgs boson plus a real W or Z boson are kinematically forbidden. It is also shown that in both models, the lightest neutral scalar becomes indistinguishable from the standard model Higgs boson if all other Higgs bosons of the model are much heavier than Mw.

scholarly journals The forgotten channels: charged Higgs boson decays to a W± and a non-SM-like Higgs boson

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Henning Bahl ◽  
Tim Stefaniak ◽  
Jonas Wittbrodt
Keyword(s):  
Higgs Boson ◽  
Higgs Sector ◽  
Higgs Doublet ◽  
Charged Higgs Boson ◽  
Higgs Bosons ◽  
Type I ◽  
Collider Phenomenology ◽  
Charged Higgs ◽  
Charged Higgs Bosons ◽  
Almost All

Abstract The presence of charged Higgs bosons is a generic prediction of multiplet extensions of the Standard Model (SM) Higgs sector. Focusing on the Two-Higgs-Doublet-Model (2HDM) with type I and lepton-specific Yukawa sectors, we discuss the charged Higgs boson collider phenomenology in the theoretically and experimentally viable parameter space. While almost all existing experimental searches at the LHC target the fermionic decays of charged Higgs bosons, we point out that the bosonic decay channels — especially the decay into a non-SM-like Higgs boson and a W boson — often dominate over the fermionic channels. Moreover, we revisit two genuine BSM effects on the properties of the discovered Higgs boson — the charged Higgs contribution to the diphoton rate and the Higgs decay to two light Higgs bosons — and their implication for the charged Higgs boson phenomenology. As main result of the present paper, we propose five two-dimensional benchmark scenarios with distinct phenomenological features in order to facilitate the design of dedicated LHC searches for charged Higgs bosons decaying into a W boson and a light, non-SM-like Higgs boson.

scholarly journals The “96 GeV excess” at the LHC

2021 ◽  
pp. 2142018
Author(s):  
T. Biekötter ◽  
M. Chakraborti ◽  
S. Heinemeyer
Keyword(s):  
Higgs Boson ◽  
Decay Mode ◽  
Higgs Doublet ◽  
Higgs Bosons ◽  
Final State ◽  
Light Higgs Boson ◽  
Doublet Model ◽  
Higgs Boson Search

The CMS collaboration reported an intriguing [Formula: see text] (local) excess at 96 GeV in the light Higgs-boson search in the diphoton decay mode. This mass coincides with a [Formula: see text] (local) excess in the [Formula: see text] final state at LEP. We briefly review the proposed combined interpretations for the two excesses. In more detail, we review the interpretation of this possible signal as the lightest Higgs boson in the 2 Higgs Doublet Model with an additional real Higgs singlet (N2HDM). We show which channels have the best prospects for the discovery of additional Higgs bosons at the upcoming Run 3 of the LHC.

scholarly journals SUPERSYMMETRY WITHOUT A LIGHT HIGGS BOSON BUT WITH A LIGHT PSEUDOSCALAR

2011 ◽  
Vol 26 (23) ◽  
pp. 4053-4065 ◽  
Author(s):  
PAOLO LODONE
Keyword(s):  
Higgs Boson ◽  
Parameter Space ◽  
Higgs Bosons ◽  
Light Higgs Boson ◽  
Decay Pattern ◽  
Scalar Singlet

We consider the λSUSY model, a version of the NMSSM with large λH1H2S coupling, relaxing the approximation of large singlet mass and negligible mixing of the scalar singlet with the scalar doublets. We show that there are regions of the parameter space in which the lightest pseudoscalar can be relatively light, with unusual consequences on the decay pattern of the CP-even Higgs bosons and thus on the LHC phenomenology.

scholarly journals DETECTION OF INTERMEDIATE MASS HIGGS BOSONS FROM SPONTANEOUSLY BROKEN R-PARITY SUPERSYMMETRY

1994 ◽  
Vol 09 (09) ◽  
pp. 817-827 ◽  
Author(s):  
J. C. ROMÃO ◽  
J. L. DIAZ-CRUZ ◽  
F. DE CAMPOS ◽  
J. W. F. VALLE
Keyword(s):  
Mass Spectrum ◽  
Higgs Boson ◽  
Transverse Momentum ◽  
Higgs Sector ◽  
Higgs Bosons ◽  
Supersymmetric Model ◽  
Intermediate Mass ◽  
Missing Transverse Momentum ◽  
The Standard Model ◽  
Minimal Supersymmetric Model

The Higgs sector in spontaneously broken R-parity supersymmetry (RPSUSY) shows interesting features that require new search techniques. Both the mass spectrum and production rates may differ from the Standard Model and minimal supersymmetric model (MSSM) expectations. For some parameter choices, the dominant Higgs boson decay mode can even be invisible, leading to events with large missing transverse momentum carried by superweakly interacting majorons. We study the reaction pp → Z + H + X, and find that it can lead to detectable events at LHC/SSC for a large region of parameter space.

scholarly journals One-loop corrections to the two-body decays of the neutral Higgs bosons in the complex NMSSM

2020 ◽  
Vol 80 (10) ◽  
Author(s):  
Julien Baglio ◽  
Thi Nhung Dao ◽  
Margarete Mühlleitner
Keyword(s):  
Higgs Boson ◽  
State Of The Art ◽  
Higgs Sector ◽  
New Physics ◽  
Higgs Bosons ◽  
Final States ◽  
Supersymmetric Extension ◽  
Gauge Dependence ◽  
Fortran Code ◽  
Electroweak Corrections

AbstractSince no direct signs of new physics have been observed so far indirect searches in the Higgs sector have become increasingly important. With the discovered Higgs boson behaving very standard model (SM)-like, however, indirect new physics manifestations are in general expected to be small. On the theory side, this makes precision predictions for the Higgs parameters and observables indispensable. In this paper, we provide in the framework of the CP-violating next-to-minimal supersymmetric extension of the SM (NMSSM) the complete next-to-leading order (SUSY-)electroweak corrections to the neutral Higgs boson decays that are on-shell and non-loop induced. We also investigate possible gauge-dependence issues in the decays of light Higgs bosons into fermion pairs. Together with the also provided SUSY-QCD corrections to colored final states, the newly calculated SUSY-electroweak corrections are implemented in the Fortran code which already includes the state-of-the art QCD corrections. The new code is called . This way we provide the NMSSM Higgs boson decays and branching ratios at presently highest possible precision and thereby contribute to the endeavor of searching for New Physics at present and future colliders.

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