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Published: 26 July 2024

Last updated: 27 July 2024

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1

Ferrari, Arnaud, and Nikolaos Rompotis. "Exploration of Extended Higgs Sectors with Run-2 Proton–Proton Collision Data at the LHC." Symmetry 13, no. 11 (November 10, 2021): 2144. http://dx.doi.org/10.3390/sym13112144.

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One doublet of complex scalar fields is the minimal content of the Higgs sector in order to achieve spontaneous electroweak symmetry breaking and, in turn, to generate the masses of fundamental particles in the Standard Model. However, several theories beyond the Standard Model predict a nonminimal Higgs sector and introduce additional singlets, doublets or even higher-order weak isospin representations, thereby yielding additional Higgs bosons. With its high proton–proton collision energy (13 TeV during Run-2), the Large Hadron Collider opens a new window towards the exploration of extended Higgs sectors. This review article summarises the current state-of-the-art experimental results recently obtained in searches for new neutral and charged Higgs bosons with a partial or full Run-2 dataset.

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2

Furey, C. "A demonstration that electroweak theory can violate parity automatically (leptonic case)." International Journal of Modern Physics A 33, no. 04 (February 10, 2018): 1830005. http://dx.doi.org/10.1142/s0217751x18300053.

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We bring to light an electroweak model which has been reappearing in the literature under various guises.[Formula: see text] In this model, weak isospin is shown to act automatically on states of only a single chirality (left). This is achieved by building the model exclusively from the raising and lowering operators of the Clifford algebra [Formula: see text]. That is, states constructed from these ladder operators mimic the behaviour of left- and right-handed electrons and neutrinos under unitary ladder operator symmetry. This ladder operator symmetry is found to be generated uniquely by [Formula: see text] and [Formula: see text]. Crucially, the model demonstrates how parity can be maximally violated, without the usual step of introducing extra gauge and extra Higgs bosons, or ad hoc projectors.

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3

Schott, Matthias, and Junjie Zhu. "Diboson production in proton–proton collisions at $\sqrt{s} = 7~{\rm TeV}$." International Journal of Modern Physics A 29, no. 26 (October 16, 2014): 1430053. http://dx.doi.org/10.1142/s0217751x14300531.

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This review summarizes results on the production cross-section measurements of electroweak boson pairs (WW, WZ, ZZ, Wγ and Zγ) at the Large Hadron Collider (LHC) in pp collisions at a center-of-mass energy of [Formula: see text]. The two general-purpose detectors at the LHC, ATLAS and CMS recorded an integrated luminosity of ≈5 fb -1 in 2011, which offered the possibility to study the properties of diboson production to high precision. These measurements test predictions of the Standard Model (SM) in a new energy regime and are crucial for the understanding and the measurement of the SM Higgs boson and other new particles. In this review, special emphasis is drawn on the combination of results from both experiments and a common interpretation with respect to state-of-the-art SM predictions.

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4

Ma, Chao, Jinhui Xu, Tiancheng Hou, Bin Lan, and Zhenhua Zhang. "Deep extreme feature extraction: New MVA method for searching particles in high energy physics." Filomat 32, no. 5 (2018): 1711–25. http://dx.doi.org/10.2298/fil1805711m.

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In this paper, we propose Deep Extreme Feature Extraction (DEFE), a new ensemble MVA method for searching ?+?- channel of Higgs bosons in high energy physics. DEFE can be viewed as a deep ensemble learning scheme that trains a strongly diverse set of neural feature learners without explicitly encouraging diversity and penalizing correlations, which is achieved by adopting an implicit neural controller (not involved in feed forward computation) that directly controls and distributes gradient flows from higher level deep prediction network. Such model-independent controller results in that every single local feature learned are used in the feature-to-output mapping stage, avoiding the blind averaging of features. DEFE makes the ensembles ?deep? in the sense that it allows deep post-process of these features that try to learn to select and abstract the ensemble of neural feature learners. Based the construction and approximation of the so-called extreme selection region, the DEFE model is able to be trained efficiently, and extract discriminative features from multiple angles and dimensions, hence the improvement of the selection region of searching new particles in HEP can be achieved. With the application of this model, a selection region full of signal processes can be obtained through the training of miniature collision events set. In comparison with the Classic Deep Neural Network, DEFE shows a state-of-the-art performance: the error rate has decreased by about 37%, the accuracy has broken through 90% for the first time, along with the discovery significance has reached a standard deviation of 6.0?. Experimental data shows that DEFE is able to train an ensemble of discriminative feature learners that boosts the over performance of final prediction. Furthermore, among high-level features, there are still some important patterns that are unidentified by DNN and are independent of low-level features, while DEFE is able to identify these significant patterns more efficiently

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5

Biondini, Simone, Philipp Schicho, and Tuomas V. I. Tenkanen. "Strong electroweak phase transition in t-channel simplified dark matter models." Journal of Cosmology and Astroparticle Physics 2022, no. 10 (October 1, 2022): 044. http://dx.doi.org/10.1088/1475-7516/2022/10/044.

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Abstract Beyond the Standard Model physics is required to explain both dark matter and the baryon asymmetry of the universe, the latter possibly generated during a strong first-order electroweak phase transition. While many proposed models tackle these problems independently, it is interesting to inquire whether the same model can explain both. In this context, we link state-of-the-art perturbative assessments of the phase transition thermodynamics with the extraction of the dark matter energy density. These techniques are applied to a next-to-minimal dark matter model containing an inert Majorana fermion that is coupled to Standard Model leptons via a scalar mediator, where the mediator interacts directly with the Higgs boson. For dark matter masses 180 GeV < M χ ≲ 300 GeV, we discern regions of the model parameter space that reproduce the observed dark matter energy density and allow for a first-order phase transition, while evading the most stringent collider constraints.

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6

Chen, Shu. "Analysis of Dark Matter Candidates and Detection Scenarios." Highlights in Science, Engineering and Technology 38 (March 16, 2023): 678–84. http://dx.doi.org/10.54097/hset.v38i.5929.

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In recent years, the observations collected by the state-of-art detectors have shown that there is considerable amount of invisible matter in our universe, which is named as dark matter. The study of dark matter has become one of the main research directions nowadays. Contemporarily, there are many particle models are considered as candidate of dark matter, including the models of axion, sterile neutrino, and Weakly Interacting Massive Particle (WIMP) e.g., inert Higgs boson, lightest Kaluza-Klein particle and neutralino in supersymmetry. Furthermore, there are also many experiments and measurements of axions and WIMPs, including axion haloscope ADMX, axion helioscope CAST, and WIMP nuclear recoil detection experiments, such as LUX-ZEPLIN and DarkSide-50. In this paper, the basic model of above candidates will be introduced. In addition, discussion about the additional parity-like symmetry for WIMP model building, shortage of the experiments and the future upgraded dark matter experiments will also be presented. Overall, these results shed light on guiding further exploration of dark matter detection and searching.

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7

MÉNDEZ, A. "HIGGS BOSONS." Modern Physics Letters A 05, no. 26 (October 20, 1990): 2087–100. http://dx.doi.org/10.1142/s0217732390002389.

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The main phenomenological aspects of the Higgs bosons are briefly reviewed in the context of the Standard Model and in models with an "extended" Higgs sector. Among the latter, special emphasis is made on the Two-Doublet Model and, particularly, the Minimal Supersymmetric Model.

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8

Tschirhart, Robert S. "Beams for the Intensity Frontier of Particle Physics." Reviews of Accelerator Science and Technology 06 (January 2013): 1–18. http://dx.doi.org/10.1142/s1793626813300016.

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Advances in high intensity beams have driven particle physics forward since the inception of the field. State-of-the-art and next generation high intensity beams will drive experiments searching for ultrarare processes sensitive through quantum corrections to new particle states far beyond the reach of direct production in foreseeable beam colliders. The recent discovery of the ultrarare B meson decay Bs → μμ, with a branching fraction of 3 × 10-9 for example, has set stringent limits on new physics within direct reach of the Large Hadron Collider. Today, even in the context of the Higgs boson discovery, observation of finite neutrino masses is the only laboratory evidence of physics beyond the Standard Model of particle physics. The tiny mass scale of neutrinos may foretell and one day expose physics that connects quarks and leptons together at the "grand unification" scale and may be the portal through which our world came to the matter-dominated state so different from conditions we expect in the early universe. Here we describe next generation neutrino and rare processes experiments that will deeply probe these and other questions central to the field of particle physics.

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9

MÉNDEZ, A. "ERRATA: HIGGS BOSONS." Modern Physics Letters A 06, no. 16 (May 30, 1991): 1533. http://dx.doi.org/10.1142/s0217732391002517.

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10

Yong, Taiyi. "Some Basic Properties of Higgs Bosons." Highlights in Science, Engineering and Technology 17 (November 10, 2022): 324–27. http://dx.doi.org/10.54097/hset.v17i.2622.

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Known as one of the most hopeful fields to find the new particle—Higgs bosons and become even more important after it is proved by Higgs. Higgs and his colleagues further improve their observation of the Higgs Bosons through the Higgs mechanism. This paper will show the basic properties of the Higgs bosons, and some machines of the Higgs bosons. The spontaneous symmetry breaking, and the Higgs mechanism have also been introduced due to their necessity for the Higgs boson. This paper will be an introduction for anyone who is interested in this field.

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11

Jaiswal, Amaresh, Najmul Haque, Aman Abhishek, Raktim Abir, Aritra Bandyopadhyay, Khatiza Banu, Samapan Bhadury, et al. "Dynamics of QCD matter — current status." International Journal of Modern Physics E 30, no. 02 (February 2021): 2130001. http://dx.doi.org/10.1142/s0218301321300010.

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In this article, there are 18 sections discussing various current topics in the field of relativistic heavy-ion collisions and related phenomena, which will serve as a snapshot of the current state of the art. Section 1 reviews experimental results of some recent light-flavored particle production data from ALICE collaboration. Other sections are mostly theoretical in nature. Very strong but transient magnetic field created in relativistic heavy-ion collisions could have important observational consequences. This has generated a lot of theoretical activity in the last decade. Sections 2, 7, 9, 10 and 11 deal with the effects of the magnetic field on the properties of the QCD matter. More specifically, Sec. 2 discusses mass of [Formula: see text] in the linear sigma model coupled to quarks at zero temperature. In Sec. 7, one-loop calculation of the anisotropic pressure are discussed in the presence of strong magnetic field. In Sec. 9, chiral transition and chiral susceptibility in the NJL model is discussed for a chirally imbalanced plasma in the presence of magnetic field using a Wigner function approach. Sections 10 discusses electrical conductivity and Hall conductivity of hot and dense hadron gas within Boltzmann approach and Sec. 11 deals with electrical resistivity of quark matter in presence of magnetic field. There are several unanswered questions about the QCD phase diagram. Sections 3, 11 and 18 discuss various aspects of the QCD phase diagram and phase transitions. Recent years have witnessed interesting developments in foundational aspects of hydrodynamics and their application to heavy-ion collisions. Sections 12 and 15–17 of this article probe some aspects of this exciting field. In Sec. 12, analytical solutions of viscous Landau hydrodynamics in 1+1D are discussed. Section 15 deals with derivation of hydrodynamics from effective covariant kinetic theory. Sections 16 and 17 discuss hydrodynamics with spin and analytical hydrodynamic attractors, respectively. Transport coefficients together with their temperature- and density-dependence are essential inputs in hydrodynamical calculations. Sections 5, 8 and 14 deal with calculation/estimation of various transport coefficients (shear and bulk viscosity, thermal conductivity, relaxation times, etc.) of quark matter and hadronic matter. Sections 4, 6 and 13 deal with interesting new developments in the field. Section 4 discusses color dipole gluon distribution function at small transverse momentum in the form of a series of Bells polynomials. Section 6 discusses the properties of Higgs boson in the quark–gluon plasma using Higgs–quark interaction and calculate the Higgs decays into quark and anti-quark, which shows a dominant on-shell contribution in the bottom-quark channel. Section 13 discusses modification of coalescence model to incorporate viscous corrections and application of this model to study hadron production from a dissipative quark–gluon plasma.

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12

King, S. F., M. Mühlleitner, R. Nevzorov, and K. Walz. "Natural NMSSM Higgs bosons." Nuclear Physics B 870, no. 2 (May 2013): 323–52. http://dx.doi.org/10.1016/j.nuclphysb.2013.01.020.

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13

Królikowski, W. "Algebraically composite Higgs bosons." Physical Review D 46, no. 11 (December 1, 1992): 5188–91. http://dx.doi.org/10.1103/physrevd.46.5188.

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14

Georgi, Howard, and Marie Machacek. "Doubly charged Higgs bosons." Nuclear Physics B 262, no. 3 (December 1985): 463–77. http://dx.doi.org/10.1016/0550-3213(85)90325-6.

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15

Igo-Kemenes, P. "Searches for higgs bosons." European Physical Journal C 15, no. 1-4 (January 1, 2000): 274–86. http://dx.doi.org/10.1007/bf02683438.

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16

KRASNIKOV, N. V. "THE SEARCH FOR NONSTANDARD HIGGS BOSONS WITH BIG YUKAWA COUPLING CONSTANTS AT FNAL AND LHC." Modern Physics Letters A 10, no. 35 (November 20, 1995): 2675–85. http://dx.doi.org/10.1142/s0217732395002805.

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We discuss the phenomenology of many Higgs doublet model—the model where each Higgs doublet couples with its own quark and lepton with relatively big Yukawa coupling constants. Namely, we investigate the discovery potential of the Higgs bosons at LHC and find lower mass limits on nonstandard Higgs bosons from FNAL data. We find that it is possible to discover such Higgs bosons at LHC with the masses up to 5 TeV.

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17

YAMADA, ATSUSHI. "PROBING THE HIGGS SECTOR OF THE MINIMAL SUPERSYMMETRIC STANDARD MODEL AT e+e− COLLIDERS." Modern Physics Letters A 07, no. 31 (October 10, 1992): 2877–88. http://dx.doi.org/10.1142/s021773239200224x.

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The ability of future e+e− colliders to study the supersymmetric Higgs sector is examined. The effects of the radiative corrections are included. A global analysis is given for the production cross-sections of the neutral Higgs bosons over the full parameter space of the Higgs sector, which clarifies the integrated luminosity necessary for the detection of the neutral Higgs bosons. The branching ratios of the three neutral Higgs bosons are also computed.

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18

Guchait, Monoranjan, and Jacky Kumar. "Light Higgs bosons in NMSSM at the LHC." International Journal of Modern Physics A 31, no. 12 (April 28, 2016): 1650069. http://dx.doi.org/10.1142/s0217751x1650069x.

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The next-to-minimal supersymmetric Standard Model (NMSSM) with an extended Higgs sector offers at least one Higgs boson as the Standard Model (SM)-like Higgs with a mass around 125 GeV. In this work, we revisit the mass spectrum and couplings of non-SM-like Higgs bosons taking into consideration most relevant constraints and identify the relevant parameter space. The discovery potential of these non-SM-like Higgs bosons, apart from their masses, is guided by their couplings with gauge bosons and fermions which are very much parameter space sensitive. We evaluate the rates of productions of these non-SM-like Higgs bosons at the LHC for a variety of decay channels in the allowed region of the parameter space. Although [Formula: see text], [Formula: see text] modes appear to be the most promising decay channels, but for a substantial region of parameter space the two-photon decay mode has a remarkably large rate. In this study we emphasize that this diphoton mode can be exploited to find the non-SM-like Higgs bosons of the NMSSM and can also be a potential avenue to distinguish the NMSSM from the MSSM. In addition, we discuss briefly the various detectable signals of these non-SM Higgs bosons at the LHC.

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19

LAVOURA, L. "MAXIMAL CP VIOLATION VIA HIGGS-BOSON EXCHANGE." International Journal of Modern Physics A 08, no. 02 (January 20, 1993): 375–89. http://dx.doi.org/10.1142/s0217751x93000151.

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The unitarity of the mixing matrix of the charged Higgs bosons, and the orthogonality of the mixing matrix of the neutral Higgs bosons, are used to derive upper bounds on the values of general CP-violating expressions. The bounds are independent of the total number of Higgs fields in any specific model. They allow us to relax the usual assumption of only one Higgs boson being light. It is natural that the CP violation in the exchange of neutral Higgs bosons between bottom quarks be particularly large.

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20

HALYO, EDI. "TECHNIDILATON OR HIGGS?" Modern Physics Letters A 08, no. 03 (January 30, 1993): 275–83. http://dx.doi.org/10.1142/s0217732393000271.

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Interactions of the technidilaton with fermions and gauge bosons are obtained by constructing a low energy effective Lagrangian and using the fact that the technidilaton couples to the trace of the energy-momentum tensor Θµµ. Technidilaton’s interactions are compared with those of the Higgs bosons of the Standard Model with one or two scalar doublets.

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21

LAVOURA, L. "MODELS OF CP VIOLATION EXCLUSIVELY VIA NEUTRAL-SCALAR EXCHANGE." International Journal of Modern Physics A 09, no. 11 (April 30, 1994): 1873–88. http://dx.doi.org/10.1142/s0217751x94000807.

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I suggest a two-Higgs-doublet model in which CP violation is mediated only by the neutral Higgs bosons, via the mechanism of scalar-pseudoscalar mixing. In this model there is no CP violation in the exchange of either W bosons or charged Higgs bosons. The model has only two basic CP-violating quantities. I remark that other models of this kind, but with more than two Higgs doublets, may also be built.

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22

QIN, XIN, and YAO-BEI LIU. "TRIPLE HIGGS BOSON PRODUCTION AT THE ILC IN THE LEFT–RIGHT TWIN HIGGS MODEL." International Journal of Modern Physics A 27, no. 06 (March 10, 2012): 1250030. http://dx.doi.org/10.1142/s0217751x12500303.

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Besides the SM-like Higgs boson h, the left–right twin Higgs (LRTH) model predicts the existence of three additional Higgs bosons: one neutral Higgs ϕ0and a pair of charged Higgs bosons ϕ±. In this paper, we focus on the study of the triple Higgs production at the ILC, i.e. e+e-→ϕ0ϕ+ϕ-and e+e-→hhϕ0. We present the production cross-sections and the distributions of the various observables, such as, the distributions of the energy and the transverse momenta of neutral and charged Higgs bosons, the differential cross-section of the invariant mass of final Higgs bosons pair, and the production angle distributions of neutral Higgs boson and charged Higgs boson. Our numerical results show that, for the processes e+e-→ϕ0ϕ+ϕ-and e+e-→hhϕ0, the production rates are at the level of 10-1fb with reasonable parameter values while the resonance production cross-section can be significantly enhanced and reach several tens fb. The signatures for signals and corresponding standard model backgrounds are also investigated for the decay mode [Formula: see text].

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23

Chen, Ning. "The LHC searches for heavy neutral Higgs bosons by jet substructure analysis." International Journal of Modern Physics A 31, no. 33 (November 22, 2016): 1644009. http://dx.doi.org/10.1142/s0217751x16440097.

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The two-Higgs-doublet model contains extra Higgs bosons with mass ranges spanning from several hundred GeV to about 1 TeV. We study the possible experimental searches for the neutral Higgs bosons of [Formula: see text] and [Formula: see text] at the future high-luminosity LHC runs. Besides of the conventional search modes that are inspired by the supersymmetric models, we discuss two search modes which were not quite addressed previously. They are the decay modes of [Formula: see text] and [Formula: see text]. Thanks to the technique of tagging boosted objects of SM-like Higgs bosons and top quarks, we show the improved mass reaches for heavy neutral Higgs bosons with masses up to [Formula: see text]. The modes proposed here are complementary to the conventional experimental searches motivated by the MSSM.

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24

Dziewit, Bartosz, Magdalena Kordiaczyńska, and Tripurari Srivastava. "Production of the Doubly Charged Higgs Boson in Association with the SM Gauge Bosons and/or Other HTM Scalars at Hadron Colliders." Symmetry 13, no. 7 (July 10, 2021): 1240. http://dx.doi.org/10.3390/sym13071240.

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We investigate an extension of the Standard Model with one additional triplet of scalar bosons. Altogether, the model contains four Higgs bosons. We analyze the associated production of the doubly charged scalar with the Standard Model gauge bosons and the remaining Higgs bosons of the model, which are: the light (SM) and heavy neutral scalars and a singly charged scalar. We estimate, in the context of the present (HL–LHC) and future (FCC–hh) hadron colliders, the most promising processes in which a single produced doubly charged Higgs boson is involved.

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25

Baer, Howard, Vernon Barger, Xerxes Tata, and Kairui Zhang. "Prospects for Charged Higgs Bosons in Natural SUSY Models at the High-Luminosity LHC." Symmetry 15, no. 8 (July 25, 2023): 1475. http://dx.doi.org/10.3390/sym15081475.

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We continue our examination of prospects for the discovery of heavy Higgs bosons of natural SUSY (natSUSY) models at the high luminosity LHC (HL-LHC), this time focusing on charged Higgs bosons. In natSUSY, higgsinos are expected at the few hundred GeV scale whilst electroweak gauginos inhabit the TeV scale and the heavy Higgs bosons, H, A and H± could range up tens of TeV without jeopardizing naturalness. For TeV-scale heavy SUSY Higgs bosons H, A and H±, as currently required by LHC searches, SUSY decays into gaugino plus higgsino can dominate H± decays provided these decays are kinematically accessible. The visible decay products of higgsinos are soft making them largely invisible, whilst the gauginos decay to W, Z or h plus missing transverse energy (ET). Charged Higgs bosons are dominantly produced at LHC14 via the parton subprocess, gb→H±t. In this paper, we examine the viability of observing signatures from H±→τν, H±→tb and H±→W,Z,h+ET events produced in association with a top quark at the HL-LHC over large Standard Model (SM) backgrounds from (mainly) tt¯, tt¯V and tt¯h production (where V=W,Z). We find that the greatest reach is found via the SM H±(→τν)+t channel with a subdominant contribution from the H±(→tb)+t channel. Unlike for neutral Higgs searches, the SUSY decay modes appear to be unimportant for H± searches at the HL-LHC. We delineate regions of the mA vs. tanβ plane, mostly around mA∼ 1–2 TeV, where signals from charged Higgs bosons would serve to confirm signals of a heavy, neutral Higgs boson at the 5σ level or, alternatively, to exclude heavy Higgs bosons at the 95% confidence level at the high luminosity LHC.

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26

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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27

Potter, C. T. "NMSSM light decoupled Higgs singlet at CEPC." International Journal of Modern Physics A 32, no. 34 (December 10, 2017): 1746011. http://dx.doi.org/10.1142/s0217751x17460113.

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We describe the phenomenology of light singlet Higgs bosons in the Next-to-Minimal Supersymmetry Model (NMSSM) which are mostly decoupled from the rest of Supersymmetry. Noting that the Large Hadron Collider has not excluded this scenario, we describe previous searches for light Higgs bosons at the Large Electron Positron collider and evaluate the sensitivity to neutralino production and decay to light singlet Higgs bosons at the proposed [Formula: see text] GeV Circular Electron Positron Collider.

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BARR, STEPHEN M., and XAVIER CALMET. "GRAND UNIFICATION WITHOUT HIGGS BOSONS." International Journal of Modern Physics: Conference Series 13 (January 2012): 20–27. http://dx.doi.org/10.1142/s2010194512006691.

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We discuss how a model for the electroweak interactions without a Higgs could be embedded into a grand unified theory. The requirement of a non-trivial fixed point in the SU(2) sector of the weak interactions together with the requirement of the numerical unification of the gauge couplings leads to a prediction for the value of the SU(2) gauge coupling in the fixed point regime. The fixed point regime must be in the TeV region to solve the unitarity problem in the elastic scattering of W bosons. We find that the unification scale is at about 1014 GeV. Viable grand unified theories must thus conserve baryon number. We discuss how to build such a model without using Higgs bosons.

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29

Anselm, A. "Selected problems around higgs bosons." Surveys in High Energy Physics 7, no. 1-4 (January 1994): 107–35. http://dx.doi.org/10.1080/01422419408241245.

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30

Jakobs, Karl. "Higgs bosons at the LHC." European Physical Journal C 59, no. 2 (October 14, 2008): 463–95. http://dx.doi.org/10.1140/epjc/s10052-008-0746-8.

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31

NICHOLSON, ANGUS F., and DALLAS C. KENNEDY. "ELECTROWEAK THEORY WITHOUT HIGGS BOSONS." International Journal of Modern Physics A 15, no. 10 (April 20, 2000): 1497–519. http://dx.doi.org/10.1142/s0217751x00000677.

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A perturbative SU (2)L× U (1)Y electroweak theory containing W, Z, photon, ghost, lepton and quark fields, but no Higgs or other fields, gives masses to W, Z and the nonneutrino fermions by means of an unconventional choice for the unperturbed Lagrangian and a novel method of renormalization. The renormalization extends to all orders. The masses emerge on renormalization to one loop. To one loop the neutrinos are massless, the A↔Z transition drops out of the theory, the d quark is unstable and S matrix elements are independent of the gauge parameter ξ.

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32

Chivukula, R. Sekhar, Andrew Cohen, Howard Georgi, Benjamin Grinstein, and Aneesh V. Manohar. "Higgs decay into goldstone bosons." Annals of Physics 192, no. 1 (May 1989): 93–103. http://dx.doi.org/10.1016/0003-4916(89)90119-x.

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33

Grzadkowski, Bohdan. "Higgs bosons at 90 GeV." Nuclear Physics B - Proceedings Supplements 13 (February 1990): 161–63. http://dx.doi.org/10.1016/0920-5632(90)90047-x.

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34

Diaz-Cruz, J. L. "Searching for supersymmetric Higgs bosons." Nuclear Physics B 358, no. 1 (July 1991): 97–120. http://dx.doi.org/10.1016/0550-3213(91)90533-4.

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35

Rosca, A. "Fermiophobic Higgs bosons at LEP." Nuclear Physics B - Proceedings Supplements 117 (April 2003): 743–45. http://dx.doi.org/10.1016/s0920-5632(03)90661-x.

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36

Abbiendi et al., G. "Search for Higgs bosons in." European Physical Journal C 7, no. 3 (1999): 407. http://dx.doi.org/10.1007/s100520050417.

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37

Quiros, Mariano. "Higgs bosons in extra dimensions." Modern Physics Letters A 30, no. 15 (May 7, 2015): 1540012. http://dx.doi.org/10.1142/s021773231540012x.

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In this paper, motivated by the recent discovery of a Higgs-like boson at the Large Hadron Collider (LHC) with a mass mH≃125 GeV , we review different models where the hierarchy problem is solved by means of a warped extra dimension. In the Randall–Sundrum (RS) model electroweak observables provide very strong bounds on the mass of KK modes which motivates extensions to overcome this problem. Two extensions are briefly discussed. One particular extension is based on the deformation of the metric such that it strongly departs from the AdS5 structure in the IR region while it goes asymptotically to AdS5 in the UV brane. This model has the IR brane close to a naked metric singularity (which is outside the physical interval) characteristic of soft-walls constructions. The proximity of the singularity provides a strong wave function renormalization for the Higgs field which suppresses the T and S parameters. The second class of considered extensions are based on the introduction of an extra gauge group in the bulk such that the custodial SU (2)R symmetry is gauged and protects the T parameter. By further enlarging the bulk gauge symmetry one can find models where the Higgs is identified with the fifth component of gauge fields and for which the Higgs potential along with the Higgs mass can be dynamically determined by the Coleman–Weinberg mechanism.

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38

Ohl, T., and C. Schwinn. "Forests, groves and Higgs bosons." European Physical Journal C 30, no. 4 (October 2003): 567–82. http://dx.doi.org/10.1140/epjc/s2003-01313-3.

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39

Dawson, Sally, John F. Gunion, and Howard E. Haber. "Are light Higgs bosons allowed?" Physical Review D 41, no. 9 (May 1, 1990): 2844–55. http://dx.doi.org/10.1103/physrevd.41.2844.

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40

Gunion, J. F., H. E. Haber, and J. Wudka. "Sum rules for Higgs bosons." Physical Review D 43, no. 3 (February 1, 1991): 904–12. http://dx.doi.org/10.1103/physrevd.43.904.

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41

Sugita, K., Y. Okamoto, and M. Sekine. "Composite model of Higgs bosons." Il Nuovo Cimento A 106, no. 2 (February 1993): 271–73. http://dx.doi.org/10.1007/bf02800071.

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Ellis, John, K. Enqvist, D. V. Nanopoulos, and S. Ritz. "Light Higgs bosons and supersymmetry." Physics Letters B 158, no. 5 (August 1985): 417–23. http://dx.doi.org/10.1016/0370-2693(85)90444-7.

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43

Barger, V., and W. Y. Keung. "Stoponium decays to Higgs bosons." Physics Letters B 211, no. 3 (September 1988): 355–62. http://dx.doi.org/10.1016/0370-2693(88)90915-x.

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44

Jakobs, Karl, and Thomas Müller. "Die Entdeckung des Higgs-Bosons." Physik in unserer Zeit 44, no. 6 (November 2013): 274–79. http://dx.doi.org/10.1002/piuz.201301356.

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45

Veatch, Jason. "Searches for Resonant Scalar Boson Pair Production Using Run 2 LHC Proton-Proton Collision Data." Symmetry 14, no. 2 (January 28, 2022): 260. http://dx.doi.org/10.3390/sym14020260.

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The discovery of the Higgs boson in 2012 provided confirmation of spontaneous electroweak symmetry breaking as the mechanism by which fundamental particles gain mass and thus completed the Standard Model of particle physics. Additionally, it opened a new approach to searching for potential new particles. Many beyond the Standard Model theories predict new heavy particles that couple to the Higgs boson, leading to a resonant production mode of Higgs boson pairs. Other theories extend the Higgs sector by introducing additional scalar bosons that differ from the observed Higgs boson only by mass. The ATLAS and CMS Collaborations have searched for evidence of such processes using s=13 TeV Run 2 proton-proton collision data at the Large Hadron Collider. This review article summarizes the latest experimental results from searches for resonant production of pairs of Higgs bosons or additional Higgs-like scalar bosons at ATLAS and CMS.

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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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Mankel, R. "Higgs searches beyond the Standard Model." International Journal of Modern Physics: Conference Series 31 (January 2014): 1460288. http://dx.doi.org/10.1142/s2010194514602889.

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While the existence of a Higgs boson with a mass near 125 GeV has been clearly established, the detailed structure of the entire Higgs sector is yet unclear. Besides the Standard Model interpretation, various possibilities for extended Higgs sectors are being considered. The minimal supersymmetric extension (MSSM) features two Higgs doublets resulting in five physical Higgs bosons, which are subject to direct searches. Alternatively, more generic Two-Higgs Doublet models (2HDM) are used for the interpretation of results. The Next-to-Minimal Supersymmetric Model (NMSSM) has a more complex Higgs sector with seven physical states. Also exotic Higgs bosons decaying to invisible final states are considered. This article summarizes recent findings based on results from collider experiments.

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Mankel, R. "Higgs searches beyond the Standard Model." International Journal of Modern Physics A 29, no. 24 (September 29, 2014): 1430057. http://dx.doi.org/10.1142/s0217751x14300579.

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While the existence of a Higgs boson with a mass near 125 GeV has been clearly established, the detailed structure of the entire Higgs sector is yet unclear. Besides the Standard Model interpretation, various possibilities for extended Higgs sectors are being considered. The minimal supersymmetric extension (MSSM) features two Higgs doublets resulting in five physical Higgs bosons, which are subject to direct searches. Alternatively, more generic Two-Higgs Doublet models (2HDM) are used for the interpretation of results. The Next-to-Minimal Supersymmetric Model (NMSSM) has a more complex Higgs sector with seven physical states. Also exotic Higgs bosons decaying to invisible final states are considered. This article summarizes recent findings based on results from collider experiments.

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Siringo, F. "Light Higgs bosons from a strongly interacting Higgs sector." Europhysics Letters (EPL) 59, no. 6 (September 2002): 820–26. http://dx.doi.org/10.1209/epl/i2002-00116-1.

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Bengtsson, Hans-Uno, Hiroaki Yamamoto, and Sachio Komamiya. "SEARCH FOR CHARGED HIGGS BOSONS AT SSC." International Journal of Modern Physics A 02, no. 04 (August 1987): 1055–67. http://dx.doi.org/10.1142/s0217751x87000454.

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We examine the possibility of finding charged Higgs bosons (H±) at the SSC. The charged Higgs boson is produced with a top quark via a gluon+bottom quark interaction (g+b→H+t). For the two Higgs doublet models, H± decays predominantly into t+b. Since the background from QCD processes will be very severe for this decay mode, we studied the H±→τ+ν decay mode. Even for this mode, background from the processes pp→W+t+spectators→ℓ+νℓ+t+spectators will be very high. In the two Higgs doublet models, it is very difficult to extract the charged Higgs signal for reasonable values of the ratio of the two vacuum expectation values ( tan β=v1/v2).

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