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 A 96 GeV Higgs boson in the N2HDM

2020 ◽  
Vol 80 (1) ◽  
Author(s):  
T. Biekötter ◽  
M. Chakraborti ◽  
S. Heinemeyer
Keyword(s):  
Higgs Boson ◽  
Higgs Sector ◽  
Mass Range ◽  
Higgs Doublet ◽  
Type Ii ◽  
Full Agreement ◽  
Final State ◽  
Light Higgs Boson ◽  
Doublet Model ◽  
Higgs Boson Search

AbstractWe discuss a $$\sim 3\,\sigma $$∼3σ signal (local) in the light Higgs-boson search in the diphoton decay mode at $$\sim 96 \,\, \mathrm {GeV}$$∼96GeV as reported by CMS, together with a $$\sim 2\,\sigma $$∼2σ excess (local) in the $$b {{\bar{b}}}$$bb¯ final state at LEP in the same mass range. We interpret this possible signal as a Higgs boson in the 2 Higgs Doublet Model with an additional real Higgs singlet (N2HDM). We find that the lightest Higgs boson of the N2HDM can perfectly fit both excesses simultaneously, while the second lightest state is in full agreement with the Higgs-boson measurements at $$125 \,\, \mathrm {GeV}$$125GeV, and the full Higgs-boson sector is in agreement with all Higgs exclusion bounds from LEP, the Tevatron and the LHC as well as other theoretical and experimental constraints. We show that only the N2HDM type II and IV can fit both the LEP excess and the CMS excess with a large ggF production component at $$\sim 96 \,\, \mathrm {GeV}$$∼96GeV. We derive bounds on the N2HDM Higgs sector from a fit to both excesses and describe how this signal can be further analyzed at the LHC and at future $$e^+e^-$$e+e- colliders, such as the ILC.

scholarly journals Analysis of Top Quark Pair Production Signal from Neutral 2HDM Higgs Bosons at LHC

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Majid Hashemi ◽  
Mahbobeh Jafarpour
Keyword(s):  
Higgs Boson ◽  
Pair Production ◽  
Top Quark ◽  
Top Quarks ◽  
Higgs Doublet ◽  
Higgs Bosons ◽  
Type I ◽  
Final State ◽  
Doublet Model ◽  
Two Higgs Doublet Model

In this paper, the top quark pair production events are analyzed as a source of neutral Higgs bosons of the two Higgs doublet model type I at LHC. The production mechanism is pp→H/A→tt¯ assuming a fully hadronic final state through t→Wb→jjb. In order to distinguish the signal from the main background which is the standard model tt¯, we benefit from the fact that the top quarks in signal events acquire large Lorentz boost due to the heavy neutral Higgs boson. This feature leads to three collinear jets (a fat jet) which is a discriminating tool for identification of the top quarks from the Higgs boson resonances. Events with two identified top jets are selected and the invariant mass of the top pair is calculated for both signal and background. It is shown that the low tan β region has still some parts which can be covered by this analysis and has not yet been excluded by flavor physics data.

scholarly journals Effect of the charged Higgs bosons in the radiative leptonic decays of B− and D− mesons

2016 ◽  
Vol 31 (03) ◽  
pp. 1650012 ◽  
Author(s):  
Ji-Chong Yang ◽  
Mao-Zhi Yang
Keyword(s):  
Higgs Boson ◽  
Decay Mode ◽  
D Mesons ◽  
Higgs Doublet ◽  
Charged Higgs Boson ◽  
Leptonic Decays ◽  
Charged Higgs ◽  
Doublet Model ◽  
Relativistic Potential ◽  
Two Higgs Doublet Model

In this work, we study the radiative leptonic decays of [Formula: see text] and [Formula: see text] mesons in the Standard Model (SM) and two-Higgs-doublet-model (2HDM) Type II. The results are obtained using the factorization procedure, and the contribution of the order [Formula: see text] is included. The numerical results are calculated using the wave function obtained in relativistic potential model. As a result, the decay mode [Formula: see text] is found to be sensitive to the effect of the charged Higgs boson. Using the constraint on the free parameters of 2HDM given in previous works, we find the contribution of the charged Higgs boson in the decay mode [Formula: see text] can be as large as about 13%.

A Higgs boson below 125 GeV?!

2018 ◽  
Vol 33 (31) ◽  
pp. 1844006 ◽  
Author(s):  
S. Heinemeyer
Keyword(s):  
Higgs Boson ◽  
Decay Mode ◽  
Higgs Bosons ◽  
Final State ◽  
Future Collider

We briefly summarize some searches for Higgs bosons with a mass of [Formula: see text] GeV at LEP and the LHC. We discuss a possible signal in the diphoton decay mode at [Formula: see text] GeV as reported by CMS, together with a [Formula: see text] hint in the [Formula: see text] final state at LEP. We briefly review possible interpretation of such a new particle in various BSM models. We focus on possible explanations as reported within the NMSSM and the [Formula: see text]SSM. Conclusions for future collider projects are briefly outlined.

scholarly journals New scenario for aligned Higgs couplings originated from the twisted custodial symmetry at high energies

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Masashi Aiko ◽  
Shinya Kanemura
Keyword(s):  
Experimental Data ◽  
Higgs Boson ◽  
Higgs Doublet ◽  
Higgs Bosons ◽  
Coupling Constants ◽  
Global Symmetry ◽  
Fundamental Theory ◽  
Custodial Symmetry ◽  
Doublet Model ◽  
Two Higgs Doublet Model

Abstract We investigate a new scenario of the two Higgs doublet model, where the current experimental data for the electroweak rho parameter and those for the Higgs boson couplings can be simultaneously explained. In this scenario, the two Higgs doublet model is supposed to be a low energy effective theory up to a high energy scale Λ, above which a fundamental theory should appear. It is assumed that the Higgs potential respects a global symmetry at Λ (the twisted custodial symmetry), which is to be given as a consequence of the global symmetry structure of the fundamental theory above Λ. By the analysis using one-loop renormalization group equations, the above experimental data can be explained in a natural way even when the masses of the extra Higgs bosons are near the electroweak scale. We also discuss the predictions on the mass spectrum of the additional Higgs bosons and also those on the coupling constants of the standard-model-like Higgs boson, which make it possible to test this scenario at the current and future collider experiments.

scholarly journals Higgs pair production in the CP-violating two-Higgs-doublet model

2017 ◽  
Vol 32 (34) ◽  
pp. 1746002 ◽  
Author(s):  
Ligong Bian ◽  
Ning Chen ◽  
Yun Jiang
Keyword(s):  
Higgs Boson ◽  
Pair Production ◽  
Cross Sections ◽  
Higgs Doublet ◽  
High Energy ◽  
Higgs Bosons ◽  
Mixing Angles ◽  
The Future ◽  
Doublet Model ◽  
Two Higgs Doublet Model

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.

Prospect for Discovering H0, A0 in Two-Photon Collisions at a Linear Collider

2003 ◽  
Vol 18 (16) ◽  
pp. 2893-2902
Author(s):  
David Asner
Keyword(s):  
Higgs Boson ◽  
Linear Collider ◽  
Higgs Doublet ◽  
Higgs Bosons ◽  
Laser Technology ◽  
Two Photon ◽  
Doublet Model ◽  
Photon Spectra ◽  
Two Higgs Doublet Model ◽  
Future Linear Collider

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.

scholarly journals Tau-jet signatures of vectorlike quark decays to heavy charged and neutral Higgs bosons

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
Radovan Dermisek ◽  
Enrico Lunghi ◽  
Navin McGinnis ◽  
Seodong Shin
Keyword(s):  
Hadron Collider ◽  
Higgs Doublet ◽  
Higgs Bosons ◽  
Final States ◽  
Type Ii ◽  
Final State ◽  
Quark Decays ◽  
Doublet Model ◽  
Model Independent ◽  
Two Higgs Doublet Model

Abstract We study 4b + 2τ and 4b + 1τ signatures of heavy neutral and charged Higgs bosons originating from cascade decays of pair-produced new quarks. Decays of vectorlike quarks through heavy Higgses can easily dominate in the two Higgs doublet model of type-II, and the studied signatures are common to many possible decay chains. We design search strategies for these final states and discuss the mass ranges of heavy Higgs bosons and new quarks that can be explored at the Large Hadron Collider as functions of branching ratios in a model independent way. We further combine the results with a similar study focusing on decays which lead to a 6b final state and interpret the sensitivity to charged and neutral Higgs bosons and vectorlike quarks in the type-II two Higgs doublet model. We find that the LHC reach for their masses extends to well above 2 TeV in the case of an SU(2) doublet quark and to at least 1.8 TeV for a bottom-like SU(2) singlet quark in the whole range of tan β between 1 and 50.

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.

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