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Journal articles on the topic 'Higgs boson physics'

To see the other types of publications on this topic, follow the link: Higgs boson physics.

Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Junk, Thomas R., and Aurelio Juste. "Review of physics results from the Tevatron: Higgs boson physics." International Journal of Modern Physics A 30, no. 06 (February 27, 2015): 1541006. http://dx.doi.org/10.1142/s0217751x15410067.

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We review the techniques and results of the searches for the Higgs boson performed by the two Tevatron collaborations, CDF and DØ. The Higgs boson predicted by the Standard Model was sought in the mass range 90 GeV < mH < 200 GeV in all main production modes at the Tevatron: gluon–gluon fusion, WH and ZH associated production, vector boson fusion, and [Formula: see text] production, and in five main decay modes: [Formula: see text], H→τ+τ-, H→WW(*), H→ZZ(*) and H→γγ. An excess of events was seen in the [Formula: see text] searches consistent with a Standard Model Higgs boson with a mass in the range 115 GeV < mH < 135 GeV . Assuming a Higgs boson mass of mH = 125 GeV , studies of Higgs boson properties were performed, including measurements of the product of the cross section times the branching ratio in various production and decay modes, constraints on Higgs boson couplings to fermions and vector bosons, and tests of spin and parity. We also summarize the results of searches for supersymmetric Higgs bosons, and Higgs bosons in other extensions of the Standard Model.

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2

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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3

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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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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5

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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6

NATH, PRAN. "HIGGS PHYSICS AND SUPERSYMMETRY." International Journal of Modern Physics A 27, no. 28 (November 10, 2012): 1230029. http://dx.doi.org/10.1142/s0217751x12300293.

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A brief overview of Higgs physics and of supersymmetry is given. The central theme of the overview is to explore the implications of the recent discovery of a Higgs-like particle regarding the prospects for the discovery of supersymmetry assuming that it is indeed the spin-0 CP even boson that enters in the spontaneous breaking of the electroweak symmetry. The high mass of the Higgs-like boson at ~125 GeV points to the weak scale of supersymmetry that enters in the loop correction to the Higgs boson mass, to be relatively high, i.e. in the TeV region. However, since more than one independent mass scales enter in softly broken supersymmetry, the allowed parameter space of supersymmetric models can allow a small Higgs mixing parameter μ and light gaugino masses consistent with a ~125 GeV Higgs boson mass. Additionally some light third generation sfermions, i.e. the stop and the stau are also permissible. Profile likelihood analysis of a class of SUGRA models indicates that mA>300 GeV which implies one is in the decoupling phase and the Higgs couplings are close to the standard model in this limit. Thus a sensitive measurement of the Higgs couplings with fermions and with the vector bosons is needed to detect beyond the standard model effects. Other topics discussed include dark matter, proton stability, and the Stueckelberg extended models as probes of new physics. A brief discussion of the way forward in the post Higgs discovery era is given.

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7

Gonzalez Suarez, Rebeca. "Recent CMS results in top and Higgs physics." Modern Physics Letters A 32, no. 29 (September 12, 2017): 1730026. http://dx.doi.org/10.1142/s0217732317300269.

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After the Higgs boson discovery in 2012, the investigation of its properties and compatibility with the Standard Model predictions is central to the physics program of the LHC experiments. Likewise, the study of the top quark is still relevant at the LHC, more than two decades after its discovery at the Tevatron. Top quarks and Higgs bosons are produced at the LHC on a large scale and share a deep connection based on the large mass of the top quark. Both particles provide an excellent laboratory in which to search for new physics: the measurement of their properties tests the foundations of the Standard Model; and they feature prominently in a variety of exotic signals. The coupling of the Higgs boson to the top quark, a fundamental Standard Model parameter, can only be measured directly in processes where the two particles are produced together. The production of a Higgs boson together with one or two top quarks is also sensitive to several exciting new physics effects. A brief overview of the current experimental status of top quark and Higgs boson physics is presented using results from the CMS Collaboration.

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8

BÜSCHER, VOLKER, and KARL JAKOBS. "HIGGS BOSON SEARCHES AT HADRON COLLIDERS." International Journal of Modern Physics A 20, no. 12 (May 10, 2005): 2523–602. http://dx.doi.org/10.1142/s0217751x05022457.

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The investigation of the dynamics responsible for electroweak symmetry breaking is one of the prime tasks of experiments at present and future colliders. Experiments at the Tevatron [Formula: see text] Collider and at the CERN Large Hadron Collider (LHC) must be able to discover a Standard Model Higgs boson over the full mass range as well as Higgs bosons in extended models. In this review, the discovery potential for the Standard Model Higgs boson and for Higgs bosons in the Minimal Supersymmetric extension is summarized. Emphasis is put on those studies which have been performed recently within the experimental collaborations using a realistic simulation of the detector performance. This includes a discussion of the search for Higgs bosons using the vector boson fusion mode at the LHC, a discussion of the measurement of Higgs boson parameters as well as a detailed review of the MSSM sector for different benchmark scenarios. The Tevatron part of the review also contains a discussion of first physics results from data taken in the ongoing Run II.

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9

Heng, Zhaoxia, Lin Guo, Pengqiang Sun, and Wei Wei. "Charged Higgs bosons in the NMSSM under current LHC constraints." Modern Physics Letters A 34, no. 28 (September 13, 2019): 1950230. http://dx.doi.org/10.1142/s0217732319502304.

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Charged Higgs boson is a crucial prediction of new physics beyond the SM. In this work, we perform a comprehensive scan over the parameter space of NMSSM considering various experimental constraints including the direct search limits from the 13 TeV LHC, and consider the scenario that the next-to-lightest CP-even Higgs boson is SM-like. We find that the masses of charged Higgs bosons can be as light as 350 GeV, the lightest CP-even Higgs boson [Formula: see text] is predominantly singlet and can be as light as 48 GeV, and the lightest CP-odd Higgs boson [Formula: see text] is also singlet-dominated and can be as light as 82 GeV. The charged Higgs bosons mainly decay to [Formula: see text] or [Formula: see text], but the branching ratio of the exotic decays [Formula: see text] and [Formula: see text] can maximally reach 20% and 11%, respectively, which can be used to distinguish the NMSSM from MSSM. Such a heavy charged Higgs boson is inaccessible at the 13 TeV LHC with a luminosity of 36.1 fb[Formula: see text] and its detection needs higher energy and/or higher luminosity.

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Franceschini, Roberto, and Mario Greco. "Higgs and BSM Physics at the Future Muon Collider." Symmetry 13, no. 5 (May 11, 2021): 851. http://dx.doi.org/10.3390/sym13050851.

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We describe recent work on the physics of the Higgs boson and breaking of the electroweak symmetry at future muon colliders. Starting from the low-energy muon collider at the Higgs boson pole we extend our discussion to the multi-TeV muon collider and outline the physics case for such machines about the properties of the Higgs boson and physics beyond the Standard Model that can be possibly discovered.

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11

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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12

DAWSON, SALLY, and HOWARD E. HABER. "HIGGS BOSON LOW-ENERGY THEOREMS AND THEIR APPLICATIONS." International Journal of Modern Physics A 07, no. 01 (January 10, 1992): 107–20. http://dx.doi.org/10.1142/s0217751x92000065.

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We examine the Higgs boson low-energy theorems and their applications in the study of light Higgs boson interactions with mesons and baryons. In particular, we clarify how a new parameter (the A parameter) emerges when the chiral Lagrangian method is combined with the Higgs low-energy theorems to obtain predictions for the interaction of Higgs bosons and pseudoscalar mesons. The computation of the Higgs–nucleon coupling and the branching ratios for light Higgs boson production in the decays K → πH and η′ → ηH are illustrated.

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13

ZEPPENFELD, DIETER. "HIGGS PHYSICS AT THE LHC." International Journal of Modern Physics A 16, supp01b (September 2001): 831–35. http://dx.doi.org/10.1142/s0217751x01008230.

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A SM-like Higgs boson can be produced in a variety of channels at the LHC. By combining information from production via gluon fusion and weak boson fusion, various partial widths and the total Higgs boson width can be extracted. Expected accuracies for 200 fb -1 of data are in the 10% range.

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14

SOPCZAK, ANDRÉ. "HIGGS BOSON DISCOVERY POTENTIAL BEYOND THE MINIMAL STANDARD MODEL." International Journal of Modern Physics A 09, no. 11 (April 30, 1994): 1747–85. http://dx.doi.org/10.1142/s0217751x94000753.

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Detailed studies of neutral and charged Higgs boson pair production with full statistic detector simulations around [Formula: see text] with 500 pb−1 are presented in the context of a review of the Higgs boson discovery potential at LEP200. Already in the first phase of LEP200, a significant increase of the mass parameter space compared to LEP1 for the discovery of nonminimal Higgs bosons will be possible, while the mass range for the discovery of the minimal Standard Model Higgs boson will increase only marginally. The requirements for a decisive test of the Minimal Supersymmetric extension of the Standard Model (MSSM) at a later stage of LEP200 are discussed. A sensitivity mass range is given for charged Higgs bosons.

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15

Barger, V., and K. Whisnant. "HEAVY Z BOSON DECAYS TO W, Z AND HIGGS BOSONS IN E6 SUPERSTRING MODELS." International Journal of Modern Physics A 02, no. 04 (August 1987): 1171–79. http://dx.doi.org/10.1142/s0217751x87000557.

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We report on the decays of a heavy neutral gauge boson Z2 into W+W−, the Z and a Higgs boson, or two Higgs bosons in superstring-inspired electroweak models with an extra U(1) gauge group, two Higgs doublets and a Higgs singlet. The branching ratios for these processes are generally similar and two boson decay modes of Z2 must exist at the few percent level if kinematically accessible, although the bosonic modes which dominate in any given scenario depend on the U(1) quantum numbers and mixing in the Higgs sector.

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16

Kakizaki, Mitsuru, Shinya Kanemura, Mariko Kikuchi, Toshinori Matsui, and Hiroshi Yokoya. "Indirect reach of heavy MSSM Higgs bosons by precision measurements at future lepton colliders." International Journal of Modern Physics A 30, no. 33 (November 26, 2015): 1550192. http://dx.doi.org/10.1142/s0217751x15501924.

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In the Minimal Supersymmetric Standard Model (MSSM), the bottom Yukawa coupling of the Higgs boson can considerably deviate from its Standard Model prediction due to nondecoupling effects. We point out that the ratio of the Higgs boson decay branching fraction to a bottom quark pair and that to a W-boson pair from the same production channel is particularly sensitive to large additional MSSM Higgs boson mass regions at future electron–positron colliders. Based on this precision measurement, we explicitly show the indirect discovery reach of the additional Higgs bosons according to planned programs of the International Linear Collider.

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17

JAKOBS, KARL, and MARKUS SCHUMACHER. "PROSPECTS FOR HIGGS BOSON SEARCHES AT THE LHC." International Journal of Modern Physics A 23, no. 32 (December 30, 2008): 5093–115. http://dx.doi.org/10.1142/s0217751x08042808.

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The investigation of the dynamics responsible for electroweak symmetry breaking is one of the prime tasks of experiments at the CERN Large Hadron Collider (LHC). The experiments ATLAS and CMS have been designed to be able to discover a Standard Model Higgs boson over the full mass range as well as Higgs bosons in extended models. In this paper, the prospects for Higgs boson searches at the LHC are reviewed. In addition, the potential for the measurement of Higgs boson parameters is discussed.

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18

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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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

HEINEMEYER, S. "MSSM HIGGS PHYSICS AT HIGHER ORDERS." International Journal of Modern Physics A 21, no. 13n14 (June 10, 2006): 2659–772. http://dx.doi.org/10.1142/s0217751x06031028.

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Various aspects of the Higgs boson phenomenology of the Minimal Supersymmetric Standard Model (MSSM) are reviewed. Emphasis is put on the effects of higher-order corrections. The masses and couplings are discussed in the MSSM with real and complex parameters. Higher-order corrections to Higgs boson production channels at a prospective e+e-linear collider are investigated. Corrections to Higgs boson decays to SM fermions and their phenomenological implications for hadron and lepton colliders are explored.

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21

Brost, Elizabeth, and Luca Cadamuro. "Searching for Pairs of Higgs Bosons in the LHC Run 2 Dataset." Symmetry 14, no. 7 (July 18, 2022): 1467. http://dx.doi.org/10.3390/sym14071467.

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The discovery of the Higgs boson confirms the existence of a scalar sector of the standard model, responsible for electroweak symmetry breaking, but the nature and properties of the potential at the origin of this mechanism are still unknown. By studying the production of pairs of Higgs bosons (HH), physicists can directly measure the coupling of the Higgs boson to itself and thus determine the shape of this potential, which has far-reaching implications on the origin and evolution of our Universe. Because of this deep connection to the foundations of electroweak symmetry breaking, HH production is also an ideal place to search for manifestations of yet-unknown physics, such as modifications of the strength of the self-coupling and of the interaction between pairs of vector bosons and Higgs bosons. In this review article, we summarize the current searches for HH production at ATLAS and CMS, using the LHC Run 2 dataset, discuss the implications of our current constraints on physics beyond the standard model, and briefly review prospect for future HH searches.

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FOOT, ROBERT, and ARCHIL KOBAKHIDZE. "ALTERNATIVE IMPLEMENTATION OF THE HIGGS BOSON." Modern Physics Letters A 26, no. 07 (March 7, 2011): 461–67. http://dx.doi.org/10.1142/s0217732311035043.

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We discuss an alternative implementation of the Higgs boson within the Standard Model which is possible if the renormalizability condition is relaxed. Namely, at energy scale Λ the Higgs boson interacts at tree-level only with matter fermions, while the full gauge invariance is still maintained. The interactions with the electroweak gauge bosons are induced at low energies through the radiative corrections. In this scenario the Higgs boson can be arbitrarily heavy, interacting with the Standard Model fields arbitrarily weakly. No violation of unitarity in the scattering of longitudinal electroweak bosons occurs, since they become unphysical degrees of freedom at energies Λ ~ TeV.

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23

Wells, Pippa S. "The upgraded ATLAS and CMS detectors and their physics capabilities." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 373, no. 2032 (January 13, 2015): 20140046. http://dx.doi.org/10.1098/rsta.2014.0046.

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The update of the European Strategy for Particle Physics from 2013 states that Europe's top priority should be the exploitation of the full potential of the LHC, including the high-luminosity upgrade of the machine and detectors with a view to collecting 10 times more data than in the initial design. The plans for upgrading the ATLAS and CMS detectors so as to maintain their performance and meet the challenges of increasing luminosity are presented here. A cornerstone of the physics programme is to measure the properties of the 125 GeV Higgs boson with the highest possible precision, to test its consistency with the Standard Model. The high-luminosity data will allow precise measurements of the dominant production and decay modes, and offer the possibility of observing rare modes including Higgs boson pair production. Direct and indirect searches for additional Higgs bosons beyond the Standard Model will also continue.

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Mariotti, Chiara, and Giampiero Passarino. "Higgs boson couplings: Measurements and theoretical interpretation." International Journal of Modern Physics A 32, no. 04 (February 9, 2017): 1730003. http://dx.doi.org/10.1142/s0217751x17300034.

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This report will review the Higgs boson properties: the mass, the total width and the couplings to fermions and bosons. The measurements have been performed with the data collected in 2011 and 2012 at the LHC accelerator at CERN by the ATLAS and CMS experiments. Theoretical frameworks to search for new physics are also introduced and discussed.

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KONSTANTINIDIS, NIKOS. "ELECTROWEAK PHYSICS." International Journal of Modern Physics A 16, supp01a (October 2001): 15–24. http://dx.doi.org/10.1142/s0217751x01006279.

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The beginning of the new millennium marks the end of an era of high precision electroweak measurements coming from e + e - colliders. Highlights of these measurements are given in this review, with emphasis on recent results. The implications for the last unknown piece of the electroweak theory, the Higgs boson, are discussed. A report on the latest news from the direct search for the Higgs boson at LEP is also included, with some intriguing candidates promising a lot of excitement until the very last days of LEP running. Finally, the prospects after LEP, both for the precision measurements and the direct Higgs search, are outlined.

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BOOS, E. E., S. V. DEMIDOV, and D. S. GORBUNOV. "INVISIBLE HIGGS IN WEAK BOSONS ASSOCIATIVE PRODUCTION WITH HEAVY QUARKS AT LHC: PROBING MASS AND WIDTH." International Journal of Modern Physics A 26, no. 19 (July 30, 2011): 3201–18. http://dx.doi.org/10.1142/s0217751x11053900.

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New physics coupled to the Higgs boson may hide it in the standard decay channels to be investigated at LHC. We consider the models where new invisible dominant decay modes of the Higgs boson are responsible for this hiding. We propose to study at LHC the weak boson production associated with heavy quarks: our analysis revealed that boson pair invariant mass distribution is sensitive to both mass and width of the invisible Higgs boson, if it is not too far from the weak boson pair threshold. We present tree-level results for the most relevant cases of top quarks and of bottom quarks in Standard Model extensions with large b-quark Yukawa coupling. We argue that QCD corrections do not spoil these results allowing for unambiguous extraction of the Higgs boson mass and width from the analysis of large enough amount of data.

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CHENG, HAI-YANG. "ON THE WEINBERG MODEL OF CP VIOLATION." International Journal of Modern Physics A 07, no. 06 (March 10, 1992): 1059–95. http://dx.doi.org/10.1142/s0217751x92000478.

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The Weinberg three-Higgs-doublet model of CP violation and its phenomenological implications are reviewed. CP violation which arises solely from charged-Higgs-boson exchange can be accommodated in the kaon system, but it is not compatible with the constraints inferred from the neutron electric dipole moment dn and from B physics. Therefore, charged-Higgs-boson exchange cannot be the dominant source of CP violation observed in KL decays. Limits on CP violation mediated by neutral-Higgs-boson exchange are derived from the dn induced by the mechanism of Barr and Zee.

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WANG, SONG-MING. "SEARCHES FOR THE STANDARD MODEL HIGGS BOSON AT THE CDF EXPERIMENT." International Journal of Modern Physics A 24, no. 04 (February 10, 2009): 617–56. http://dx.doi.org/10.1142/s0217751x09043298.

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The understanding of the dynamics behind the breaking of the electroweak symmetry is one of the most important goals in the field of high energy physics. In the Standard Model (SM) Higgs mechanism plays a key role in the symmetry breaking, one manifestation of which is spin-0 Higgs boson. Thus the search for the Higgs boson is one of the flag-ship analyses at the Tevatron. Over the past few years the CDF experiment has made significant improvements in its sensitivity on the search for the SM Higgs boson. In this paper we summarize CDF's most recent results on the searches for the SM Higgs boson production at the Tevatron using data samples of integrated luminosities up to 3 fb-1. We also present the Tevatron's latest combined results on the SM Higgs boson search, and discuss the possibility that it could be found at the Tevatron in the near future.

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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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Cirkovic, Predrag. "Higgs Boson Physics at CMS." EPJ Web of Conferences 158 (2017): 01001. http://dx.doi.org/10.1051/epjconf/201715801001.

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BARGER, V., and K. WHISNANT. "HIGGS BOSON PRODUCTION VIA Z, W BOSONS AND TOPONIUM IN THE E6 SUPERSTRING MODEL." International Journal of Modern Physics A 03, no. 08 (August 1988): 1907–41. http://dx.doi.org/10.1142/s0217751x88000801.

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We examine the production of light Higgs bosons associated with electroweak symmetry-breaking in an E6 superstring model in Z→HZ* decays, in e+e− annihilation and in toponium decays. We find that the couplings of the lightest scalar Higgs boson [Formula: see text] in these models are very similar to those of the standard Higgs boson unless the pseudoscalar P0 in the model has mass ≤Mz. Possible new modes for Higgs boson production not found in the standard model include [Formula: see text] or [Formula: see text] and [Formula: see text] or (H+H−), where [Formula: see text] is the second lightest scalar. We give simple analytic expressions for the Higgs boson masses and mixing angles in the limit that the extra Z′ gauge boson is heavy which clearly shows the production mechanisms that are favored for a given set of model parameters. The lower bound on the mass of the charged Higgs boson associated with the electroweak symmetry breaking is 53 GeV, independent of the Z′ boson mass or mixing; this bound is realized only for very small [Formula: see text] and P0 masses. Toponium decays to [Formula: see text] and H+H− may exist at up to the per cent level for some model parameters. The dominant decay mode for [Formula: see text] could be [Formula: see text], if kinematically allowed, while the principal decays for [Formula: see text] could be [Formula: see text] or [Formula: see text] .

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CALMET, XAVIER. "ASYMPTOTICALLY SAFE WEAK INTERACTIONS." Modern Physics Letters A 26, no. 21 (July 10, 2011): 1571–76. http://dx.doi.org/10.1142/s0217732311035900.

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We emphasize that the electroweak interactions without a Higgs boson are very similar to quantum general relativity. The Higgs field could just be a dressing field and might not exist as a propagating particle. In that interpretation, the electroweak interactions without a Higgs boson could be renormalizable at the nonperturbative level because of a nontrivial fixed point. Tree-level unitarity in electroweak bosons scattering is restored by the running of the weak scale.

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Biekötter, T., M. Chakraborti, and S. Heinemeyer. "The “96 GeV excess” at the LHC." International Journal of Modern Physics A 36, no. 22 (July 30, 2021): 2142018. http://dx.doi.org/10.1142/s0217751x21420185.

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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.

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Liu, Guo-Li, and Ping Zhou. "The Contribution of Charged Bosons with Right-Handed Neutrinos to the Muon \({g-2}\) Anomaly in the Twin Higgs Models." Universe 8, no. 12 (December 11, 2022): 654. http://dx.doi.org/10.3390/universe8120654.

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We examine the charged boson and right-handed neutrino contribution to the muon g−2 anomaly in twin Higgs models with joint constraints of Higgs global fit data, precision electroweak data, leptonic flavor-changing decay μ→eγ, and the mass requirement of heavy-gauge bosons. It comes with the conclusion that some parameters, such as the coupling of charged Higgs to the lepton yμ, the top Yukawa yt, and heavy-gauge boson coupling to the lepton Vμ are constrained roughly in the range of 0.12≲yμ≲0.4, 0.4≲yt≲0.9, and 0.47≲Vμ≲1, respectively.

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35

Ramírez-Sánhez, F., A. Gutiérrez-Rodríguez, Alejandro González-Sánchez, and M. A. Hernández-Ruíz. "Z′ and Higgs Boson Production Associated with a Top Quark Pair as a Probe of the U(1)B-L Model at e+e- Colliders." Advances in High Energy Physics 2018 (July 3, 2018): 1–16. http://dx.doi.org/10.1155/2018/8523854.

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We study the production sensitivity of Higgs bosons h and H, in relation to the possible existence of Z′ boson and a top quark pair at the energy scales that will be reached in the near future at projected e+e- linear colliders. We focus on the resonance and no-resonance effects of the annihilation processes e+e-→(γ,Z,Z′)→tt-h and e+e-→(γ,Z,Z′)→tt-H. Furthermore, we develop and present novel analytical formulas to assess the total cross section involved in the production of Higgs bosons. We find that the possibility of performing precision measurements for the Higgs bosons h and H and for the Z′ boson is very promising at future e+e- linear colliders.

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Hashemi, Majid, and Mahbobeh Jafarpour. "Analysis of Top Quark Pair Production Signal from Neutral 2HDM Higgs Bosons at LHC." Advances in High Energy Physics 2018 (November 11, 2018): 1–8. http://dx.doi.org/10.1155/2018/4038243.

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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.

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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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Chen, Ning, Jiayin Gu, Tao Han, Honglei Li, Zhen Liu, Huayang Song, Shufang Su, Wei Su, Yongcheng Wu, and Jin Min Yang. "New physics implication of Higgs precision measurements." International Journal of Modern Physics A 34, no. 13n14 (May 20, 2019): 1940012. http://dx.doi.org/10.1142/s0217751x19400128.

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Studying the properties of the Higgs boson can be an important window to explore the physics beyond the Standard Model (SM). In this work, we present studies on the implications of the Higgs precision measurements at future Higgs Factories. We perform a global fit to various Higgs search channels to obtain the 95% C.L. constraints on the model parameter spaces of two-Higgs Doublet Model (2HDM) and Minimal Supersymmetric Standard Model (MSSM). In the 2HDM, we analyze tree-level effects as well as one-loop contributions from the heavy Higgs bosons. The strong constraints on [Formula: see text], heavy Higgs masses and their mass splitting are complementary to direct search of the LHC as well as possible future [Formula: see text] pole precision measurements. For the MSSM, we study both the Higgs couplings and mass precisions. The constraints on the CP-odd Higgs mass [Formula: see text] and stop mass scale [Formula: see text] can be complementary to the direct search of HL-LHC. We also compare the sensitivity of various future Higgs factories, namely, Circular Electron Positron Collider (CEPC), Future Circular Collider (FCC)-ee and International Linear Collider (ILC).

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ZERWEKH, ALFONSO R. "TWO COMPOSITE HIGGS DOUBLETS: IS IT THE LOW ENERGY LIMIT OF A NATURAL STRONG ELECTROWEAK SYMMETRY BREAKING SECTOR?" Modern Physics Letters A 25, no. 06 (February 28, 2010): 423–29. http://dx.doi.org/10.1142/s0217732310032627.

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In this paper, we propose an effective model scheme that describes the electroweak symmetry breaking sector by means of composite Higgs-like scalars, following the ideas of Minimal Walking Technicolor (MWT). We argue that, because of the general failure of Extended Technicolor (ETC) to explain the mass of the top quark, it is necessary to introduce two composite Higgs bosons: one of them originated by a MWT–ETC sector and the other produced by a Topcolor sector. We focus on the phenomenological differences between the light composite Higgs present in our model and the fundamental Higgs boson predicted by the Standard Model and their production at the LHC. We show that in this scheme the main production channel of the lighter Higgs boson is the associated production with a gauge boson and WW fusion but not the gluon–gluon fusion channel which is substantially suppressed.

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Ky, Nguyen Anh, and Nguyen Thi Hong Van. "Was the Higgs Boson Discovered?" Communications in Physics 25, no. 1 (May 8, 2015): 1. http://dx.doi.org/10.15625/0868-3166/25/1/5941.

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The standard model has postulated the existence of a scalar boson, named the Higgs boson (or the Brout-Englert-Higgs boson, for more complete). This boson plays a central role in a symmetry breaking scheme called the Higgs mechanism making the standard model realistic. However, until recently at least, the 50-year-long-sought Higgs boson had remained the only particle in the standard model not yet discovered experimentally. It is the last but very important missing ingredient of the standard model. Therefore, searching for the Higgs boson is a crucial task and an important mission of particle physics. For this purpose, many theoretical works have been done and dierent experiments have been organized. It may be said in particular that to search for the Higgs boson has been one of the ultimatums of building and running the LHC, the world's largest and most powerful particle accelerator, at CERN, which is a great combination of science and technology. Recently, in the summer of 2012, ATLAS and CMS, the two biggest and general- purpose LHC collaborations, announced the discovery of a new boson with a mass around 125 GeV. Since then, for over two years, ATLAS, CMS and other collaborations have carried out intensive investigations on the newly discovered boson to conrm that this new boson is really the Higgs boson (of the standard model). It is a triumph of science and technology and international cooperation. Here, we will review the main results of these investigations after presenting a brief introduction to the Higgs boson between the theoretical framework of the standard model and Higgs mechanism as well as a theoretical and experimental background of searching for it. This paper may attract interest of not only particle physicists but also a broader audience.

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41

KRIPFGANZ, J., and A. RINGWALD. "LEADING-ORDER FERMION-NUMBER NON-CONSERVATION IN THE (1+1)-DIMENSIONAL ABELIAN HIGGS MODEL." Modern Physics Letters A 05, no. 09 (April 10, 1990): 675–84. http://dx.doi.org/10.1142/s0217732390000767.

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We consider fermion-number violating Green’s functions involving also gauge and Higgs bosons in the axial (1+1)-dimensional Abelian Higgs model. We show that the Fourier transform of the classical vortex solution has (in the unitary gauge) an isolated pole at the position of the Higgs and gauge boson mass. In a certain sense the vortex, an Euclidean pseudoparticle, is capable to describe particles, i.e. physical gauge and Higgs bosons. From that it follows that, in the leading-order semiclassical approximation around the unit winding number vortex solution, the S-matrix elements for the fermion-number violating processes are local and of order [Formula: see text], where ν is the vacuum expectation value and n is the number of external boson legs. This suggests that, at high energy, fermion-number violating processes with associated production of many gauge and Higgs bosons have large probabilities reaching the unitarity limit, and puts the recent observation of a similar phenomenon in the standard electroweak theory on much firmer ground.

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Lu, Wei. "A Clifford algebra approach to chiral symmetry breaking and fermion mass hierarchies." International Journal of Modern Physics A 32, no. 26 (September 20, 2017): 1750159. http://dx.doi.org/10.1142/s0217751x17501597.

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We propose a Clifford algebra approach to chiral symmetry breaking and fermion mass hierarchies in the context of composite Higgs bosons. Standard model fermions are represented by algebraic spinors of six-dimensional binary Clifford algebra, while ternary Clifford algebra-related flavor projection operators control allowable flavor-mixing interactions. There are three composite electroweak Higgs bosons resulted from top quark, tau neutrino, and tau lepton condensations. Each of the three condensations gives rise to masses of four different fermions. The fermion mass hierarchies within these three groups are determined by four-fermion condensations, which break two global chiral symmetries. The four-fermion condensations induce axion-like pseudo-Nambu–Goldstone bosons and can be dark matter candidates. In addition to the 125 GeV Higgs boson observed at the Large Hadron Collider, we anticipate detection of tau neutrino composite Higgs boson via the charm quark decay channel.

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Sepehri, A., M. E. Zomorrodian, A. Moradi Marjaneh, P. Eslami, and S. Shoorvazi. "The effect of Higgs boson radiation from TeV black holes on the hadronic cross section at the LHC." Canadian Journal of Physics 90, no. 1 (January 2012): 25–37. http://dx.doi.org/10.1139/p11-134.

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In curved space–time near TeV black holes many gluons and quarks produced by the Unruh effect interact with each other and create Higgs bosons. We study the Unruh effect and show that, for gluons and quarks, the internal stationary state of a Schwarzschild black hole can be represented by a maximally entangled two-mode squeezed state of outgoing and infalling Hawking radiation. We consider different channels for Higgs boson production near event horizons of mini black holes at the Large Hadron Collider (LHC) and obtain the cross section in each channel. We observe that the cross section of a Higgs boson produced via gluon fusion near a single black hole is much larger for smaller black hole masses. This is because the temperature of the black hole becomes larger as the mass becomes smaller and the thermal radiation of the gluons is enhanced. At lower mass, MBH < 4 TeV, the black hole will not be able to emit Higgs, but will still be able to produce a quark; for MBH < 3 TeV the black hole can only emit massless gluons. We show that as the black hole mass at the LHC increases (4 TeV < MBH < 8 TeV) most of the Higgs boson production is due to the Unruh effect near the event horizon of the black hole. Comparing these Higgs boson cross sections with Higgs boson cross sections in perturbative quantum chromodynamics, we find that micro black holes can be a source of Higgs production at the LHC. Finally, we calculate the effects of Higgs boson radiation due to mini black holes on the hadronic cross section at the LHC. We observe that as the order of perturbation theory increases this effect becomes systematically more significant because at higher orders there exist more channels for Higgs production and, in our calculations, Higgs decay into massive quark–antiquark pairs. At smaller masses, MBH < 2 TeV, the hadronic cross section at leading order is large while the cross sections at next-to-leading order and at next-to-next-to-leading order are rising at MBH ∼ 2 and 3 TeV, respectively, and exhibit a turn-over at moderate values of black hole mass.

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Almarashi, Mosleh M. "Review of a Light NMSSM Pseudoscalar Higgs-State Production at the LHC." Universe 7, no. 11 (October 20, 2021): 392. http://dx.doi.org/10.3390/universe7110392.

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In this paper, we briefly review the LHC discovery potential of a light pseudoscalar Higgs boson of the NMSSM, a1, produced in the gluon fusion gg→a1, bottom-quark fusion bb¯→a1 and bottom-gluon fusion bg→ba1. We also review the LHC discovery potential of the next-to-lightest CP-even Higgs boson h2 being the non-SM-like Higgs, decaying either into two light CP-odd Higgs bosons a1 or into a light a1 and the Z gauge boson through the gluon fusion gg→h2 in the 4τ final state. We find that the light a1 can be detected at the LHC in a variety of production processes including the gluon fusion, bottom-quark fusion and bottom-gluon fusion. The latter two processes require high luminosity of the LHC and large values of tanβ. We also find that the LHC has the potential to discover the non-SM-like Higgs state, h2, decaying into a pair of light CP-odd Higgses a1’s, allowing the distinguishing of the NMSSM Higgs sector from the MSSM one as such a light a1, is impossible in the latter scenario.

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HOSOTANI, YUTAKA. "GAUGE-HIGGS UNIFICATION: STABLE HIGGS BOSONS AS COLD DARK MATTER." International Journal of Modern Physics A 25, no. 27n28 (November 10, 2010): 5068–81. http://dx.doi.org/10.1142/s0217751x1005086x.

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In the gauge-Higgs unification the 4D Higgs field becomes a part of the extra-dimensional component of the gauge potentials. In the SO(5) × U(1) gauge-Higgs unification in the Randall-Sundrum warped spacetime the electroweak symmetry is dynamically broken through the Hosotani mechanism. The Higgs bosons become absolutely stable, and become the dark matter of the universe. The mass of the Higgs boson is determined from the WMAP data to be about 70 GeV.

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Arhrib, Abdesslam, Adil Jueid, and Stefano Moretti. "Searching for heavy charged Higgs bosons through top quark polarization." International Journal of Modern Physics A 35, no. 15n16 (June 4, 2020): 2041011. http://dx.doi.org/10.1142/s0217751x20410110.

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We study the production of a heavy charged Higgs boson at the Large Hadron Collider (LHC) in [Formula: see text] within a 2-Higgs Doublet Model (2HDM). The chiral structure of the [Formula: see text] coupling can trigger a particular spin state of the top quark produced in the decay of a charged Higgs boson and, therefore, is sensitive to the underlying mechanism of the Electroweak Symmetry Breaking (EWSB). Taking two benchmark models (2HDM type-I and 2HDM type-Y) as an example, we show that inclusive rates, differential distributions and forward–backward asymmetries of the top quark’s decay products can be used to search for heavy charged Higgs bosons and also as model discriminators.

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47

Allakhverdieva, A. E., M. V. Dolgopolov, and E. N. Rykova. "Restrictions on Parameters of Minimal Supersymmetric Standard Model." Contemporary Mathematics. Fundamental Directions 64, no. 4 (December 15, 2018): 603–15. http://dx.doi.org/10.22363/2413-3639-2018-64-4-603-615.

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Higgs boson with mass mh = 126 GeV was discovered at Large Hadron Collider in 2012. Its mass corresponds both to Standard Model of elementary-particles physics and to the mass of the most lightweight Higgs boson in the minimal supersymmetric Standard Model. In this paper, we consider the MSSM model not preserving CP-invariance that contain a large number of parameters to be variated. Using the experimental value of the Higgs boson mass, we obtain the restrictions on the parameters of the model, describe phenomenological scenarios, and analyze possible areas of the space of parameters.

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KINNUNEN, RITVA. "SUSY HIGGS SEARCHES AT THE LHC." International Journal of Modern Physics A 22, no. 31 (December 20, 2007): 5935–42. http://dx.doi.org/10.1142/s0217751x07039134.

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Searches for the Higgs bosons of the Minimal Supersymmetric Standard Model are discussed at the LHC in the CMS and ATLAS experiments. Results are presented for the scenario which maximizes the mass of the lighter scalar Higgs boson. Low integrated luminosity is assumed.

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YAMAMOTO, KAZUHIRO. "HIGGS SEARCHES AT THE TEVATRON." International Journal of Modern Physics A 25, no. 27n28 (November 10, 2010): 5097–104. http://dx.doi.org/10.1142/s0217751x10050883.

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We present the latest results on searches for the standard and beyond-the-standard model Higgs bosons in proton-antiproton collisions at [Formula: see text] by the CDF and DØ experiments at the Fermilab Tevatron. No significant excess is observed above the expected background, and the cross section limits for the Higgs bosons are calculated. It is noticed that the standard model Higgs boson in the mass range 163 – 166 GeV/c2 is excluded at the 95% C.L.

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Waiwattana, Jinna, Chayanit Asawatangtrakuldee, Pakorn Saksirimontri, Vichayanun Wachirapusitanand, and Natha Pitakkultorn. "Application of Machine Learning Algorithms for Searching BSM Higgs Bosons Decaying to a Pair of Bottom Quarks." Trends in Sciences 19, no. 19 (October 4, 2022): 5373. http://dx.doi.org/10.48048/tis.2022.5373.

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Although the discovery of the 125 GeV Higgs boson confirms the Higgs mechanism of the Standard Model (SM), many theories beyond the SM have been introduced to address several phenomena yet to be explained by the SM. For instance, the 2-Higgs Doublet Models is the simplest extension of the SM Higgs sector and predicting the existence of additional Higgs bosons at different states. The aim of this study is to search for machine learning (ML) algorithms which have been widely used in High Energy Physics. This will improve the sensitivity of the search for BSM Higgs bosons produced in association with a bottom quark () that then decays into a pair of bottom quarks (); the predominant decay channel of the Higgs boson, though, buried by a large multi-jet background process. In this study, we train 2 different ML algorithms: Tree-based models and Neural Networks, to classify signal and background events collected by the Compact Muon Solenoid detector from proton-proton collisions at 13 TeV. The evaluation metrics are calculated to provide classification efficiencies from different models. The results show that the classification of signal and background processes can be improved using ML techniques. Neural Networks reported the highest AUC score of 0.951 which is comparable with Adaptive Boosting model, while Decision Trees (DTs) and Random Forest models slightly underperformed by 2 - 3 %. We therefore can make use of the trained models as signal vs background classifiers to perform further statistical analysis searches for BSM Higgs bosons. GRAPHICAL ABSTRACT

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