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Journal articles on the topic 'Large Hadron Collider (LHC) - Higgs Boson'

Author: Grafiati

Published: 7 September 2023

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1

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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BHATTACHARYA, SATYAKI. "Higgs Search with the Compact Muon Solenoid(CMS) detector at the Large Hadron Collider(LHC)." International Journal of Modern Physics A 20, no. 15 (June 20, 2005): 3400–3402. http://dx.doi.org/10.1142/s0217751x05026649.

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The Large Hadron Collider(LHC) is a proton proton collider being built at CERN, Geneva which will collide two 7 TeV proton beams giving a center of mass energy of 14 TeV. The Compact Muon Solenoid (CMS) is a multi-purpose detector at the LHC which is designed to discover the Higgs boson over the mass range of 90 to 1000 GeV. Since LEP searches have put a 95% C.L. lower bound on (standard model) Higgs mass of 114.4 GeV and theory excludes mass above about 1 TeV, CMS should discover the Higgs if it exists. In this paper, we will review CMS's Higgs-discovery potential both in the Standard Model and the Minimal Supersymmetric Standard Model for Higgs bosons produced in gluon-gluon fusion and in vector boson fusion mechanisms. Particular emphasis will be placed on discovery in the early years of running with luminosity of about 2 × 1033cm-2/s.

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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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AKKAYA, Gülistan. "Comparison Of Anomalous Higgs Couplings at the Large Hadron Collider and at Proton-Proton Collider with 100 TeV Energy." Bitlis Eren Üniversitesi Fen Bilimleri Dergisi 12, no. 2 (March 29, 2023): 396–401. http://dx.doi.org/10.17798/bitlisfen.1226395.

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Gammap and gammagamma ,called photon induced processes, have been examined in various colliders like Large Hadron Collider (LHC) and proton-proton collider with 100 TeV energy. One of the importance of these processes is that they allow for probing the anomalous Higgs couplings. The anomalous Higgs couplings constitute a testing ground for electroweak symmetry breaking (EWSB) mechanism and mass production system. For measuring anomalous Hgammagamma and HZgamma couplings at the LHC and at proton-proton collider with 100 TeV energy, the potential of the pp pgammap pHqX have been examined. Sensitivity bounds on anomalous Higgs couplings have been obtained at %95 confidence level. The analyses have been done for various integrated luminosities and for different scenarios Then the results of them have been compared. Model-independent effective Lagrangian technique have been used and the Higgs boson couplings to gauge bosons have been examined by dimension-six operators.

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TAYLOR, GEOFFREY N. "LOOKING FORWARD TO THE LARGE HADRON COLLIDER." International Journal of Modern Physics A 22, no. 27 (October 30, 2007): 5039–51. http://dx.doi.org/10.1142/s0217751x07038396.

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In this paper an overview of the Large Hadron Collider program and status is given, including a brief description of the scientific background from which this ambitious program evolved. The emphasis is on the status of the Standard Model Higgs Boson, searches for which are the key component of the LHC program. A description of the ATLAS one of the two large general purpose experiments designed to detect evidence for the Higgs Boson and other data of interest to searches for physics beyond the standard model.

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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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7

Nisati, Aleandro. "The Discovery of a Higgs Particle at the Large Hadron Collider." European Review 23, no. 1 (January 29, 2015): 57–70. http://dx.doi.org/10.1017/s1062798714000544.

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The Large Hadron Collider (LHC) at CERN is the highest energy machine for particle physics research ever built. In the years 2010–2012 this accelerator has collided protons to a centre-mass-energy up to 8 TeV (note that 1 TeV corresponds to the energy of about 1000 protons at rest; the mass of one proton is about 1.67×10–24 g). The events delivered by the LHC have been collected and analysed by four apparatuses placed alongside this machine. The search for the Higgs boson predicted by the Standard Model and the search for new particles and fields beyond this theory represent the most important points of the scientific programme of the LHC. In July 2012, the international collaborations ATLAS and CMS, consisting of more than 3000 physicists, announced the discovery of a new neutral particle with a mass of about 125 GeV, whose physics properties are compatible, within present experimental and theoretical uncertainties, to the Higgs boson predicted by the Standard Model. This discovery represents a major milestone for particle physics, since it indicates that the hypothesized Higgs mechanism seems to be responsible for the masses of elementary particles, in particular W± and Z0 bosons, as well as fermions (leptons and quarks). The 2013 Physics Nobel Prize has been assigned to F. Englert and P. Higgs, ‘for the theoretical discovery of a mechanism that contributes to our understanding of the origin of mass of subatomic particles, and which recently was confirmed through the discovery of the predicted fundamental particle, by the ATLAS and CMS experiments at CERN's Large Hadron Collider’.

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8

Horváth, Dezső. "Twenty years of searching for the Higgs boson: Exclusion at LEP, discovery at LHC." Modern Physics Letters A 29, no. 04 (February 10, 2014): 1430004. http://dx.doi.org/10.1142/s0217732314300043.

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The 40 years old Standard Model, the theory of particle physics, seems to describe all experimental data very well. All of its elementary particles were identified and studied apart from the Higgs boson until 2012. For decades, many experiments were built and operated searching for it, and finally, the two main experiments of the Large Hadron Collider (LHC) at CERN, CMS and ATLAS, in 2012 observed a new particle with properties close to those predicted for the Higgs boson. In this paper, we outline the search story: the exclusion of the Higgs boson at the Large Electron Positron (LEP) collider, and its observation at LHC.

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Dissertori, G. "The pre-LHC Higgs hunt." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 373, no. 2032 (January 13, 2015): 20140039. http://dx.doi.org/10.1098/rsta.2014.0039.

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Enormous efforts at accelerators and experiments all around the world have gone into the search for the long-sought Higgs boson, postulated almost five decades ago. This search has culminated in the discovery of a Higgs-like particle by the ATLAS and CMS experiments at CERN's Large Hadron Collider in 2012. Instead of describing this widely celebrated discovery, in this article I will rather focus on earlier attempts to discover the Higgs boson, or to constrain the range of possible masses by interpreting precise data in the context of the Standard Model of particle physics. In particular, I will focus on the experimental efforts carried out during the last two decades, at the Large Electron Positron collider, CERN, Geneva, Switzerland, and the Tevatron collider, Fermilab, near Chicago, IL, USA.

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Davy, Manyika Kabuswa, Likolo Anabiwa George, and Katongo Judith. "On the synopsis of the Higgs boson." Physics & Astronomy International Journal 7, no. 2 (May 12, 2023): 113–16. http://dx.doi.org/10.15406/paij.2023.07.00294.

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In this paper, we analyze the Standard Model (SM) Higgs boson by computing both the partial width and the amplitude of a number of decay channels that the Higgs Boson can undergo. In our computations, we treat the Higgs boson as a free parameter despite its estimated mass of around 125GeV discovered at the Large Hadron Collider (LHC).

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Banks, Michael. "CERN marks 10th anniversary of Higgs boson discovery." Physics World 35, no. 8 (September 1, 2022): 10i. http://dx.doi.org/10.1088/2058-7058/35/08/13.

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Botta, Valeria. "Measurements of the Higgs H(125) boson at CMS." EPJ Web of Conferences 182 (2018): 02018. http://dx.doi.org/10.1051/epjconf/201818202018.

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The most recent measurements of the Higgs H(125) boson in several final states, including decays to bosons, fermions, and the associated production of a Higgs boson with top quarks, are reviewed. Results have been obtained analysing the protonproton collision data collected with the CMS detector at the Large Hadron Collider (LHC) in 2016, corresponding to an integrated luminosity of 35.9 fb-1 at a centre-of-mass energy of 13 TeV.

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GINGRICH, DOUGLAS M. "SIGNATURES OF SINGLET NEUTRINOS IN LARGE EXTRA DIMENSIONS AT THE LHC." International Journal of Modern Physics A 24, no. 28n29 (November 20, 2009): 5173–215. http://dx.doi.org/10.1142/s0217751x09047636.

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It is a challenge to explain why neutrinos are so light compared to other leptons. Small neutrino masses can be explained if right-handed fermions propagate in large extra dimensions. Fermions propagating in the bulk would have implications on Higgs boson decays. If the Higgs boson is discovered at the Large Hadron Collider (LHC), a detailed analysis may reveal the presence of large extra dimensions. This paper reviews the status of large extra-dimensional models in the context of the current limits on Higgs boson masses and the fundamental Planck scale in extra dimensions.

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Arhrib, Abdesslam, Rachid Benbrik, Mohamed Krab, Bouzid Manaut, Stefano Moretti, Yan Wang, and Qi-Shu Yan. "New Light H± Discovery Channels at the LHC." Symmetry 13, no. 12 (December 4, 2021): 2319. http://dx.doi.org/10.3390/sym13122319.

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A light charged Higgs boson has been searched for at the Large Hadron Collider (LHC) via top (anti)quark decay, i.e., t→bH+, if kinematically allowed. In this contribution, we propose new channels for light charged Higgs boson searches via the pair productions pp→H±h/A and pp→H+H− at the LHC in the context of the Two-Higgs Doublet Model (2HDM) Type-I. By focusing on a case where the heavy H state is the Standard Model (SM)-like one already observed, we investigate the production of the aforementioned charged Higgs bosons and their bosonic decay channels, namely, H±→W±h and/or H±→W±A. We demonstrate that such production and decay channels can yield substantial alternative discovery channels for H± bosons at the LHC. Finally, we propose eight benchmark points (BPs) to motivate the search for such signatures.

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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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16

Rathsman, Johan, and Thomas Rössler. "Closing the Window on Light Charged Higgs Bosons in the NMSSM." Advances in High Energy Physics 2012 (2012): 1–22. http://dx.doi.org/10.1155/2012/853706.

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In the Next-to-Minimal SuperSymmetric Model (NMSSM) the lightest CP-odd Higgs bosons (a1) can be very light. As a consequence, in addition to the standard charged Higgs boson (h±) decays considered in the MSSM for a light charged Higgs (mh±<mt), the branching fraction forh±→a1Wcan be dominant. We investigate how this signal can be searched for intt-production at the Large Hadron Collider (LHC) in the case that (ma1≳2mB) with thea1giving rise to a singlebb--jet and discuss to what extent the LHC experiments are able to discover such a scenario with an integrated luminosity ~20 fb−1. We also discuss the implications of the possible Higgs-signal observed at the LHC.

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SIRINGO, FABIO. "COMPARISON OF LEADING AND NEXT-TO-LEADING LOGARITHMIC ELECTROWEAK CORRECTIONS TO HIGGS PRODUCTION." International Journal of Modern Physics A 28, no. 20 (August 7, 2013): 1350098. http://dx.doi.org/10.1142/s0217751x1350098x.

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Using soft-collinear effective theory, the leading-log radiative electroweak corrections are written in a closed and analytical form for the hadronic cross-section of Higgs production through vector boson fusion, qq → qqH, one of the most promising channels for studying the Higgs boson at Large Hadron Collider (LHC). The simple leading-log resummation is compared with a full next-to-leading-log calculation, and its accuracy is found to be of order 1% up to 10 TeV, i.e. better than the accuracy of parton distribution functions. Corrections are found to be larger than predicted by one-loop fixed-order approximations at LHC energies. The method provides a simple way of incorporating the electroweak corrections in software packages, improving the accuracy of simulations.

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18

Heim, Sarah. "Mass matters: Latest Higgs boson results from the LHC." Europhysics News 52, no. 2 (2021): 28–31. http://dx.doi.org/10.1051/epn/2021205.

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The Higgs boson was discovered at the Large Hadron Collider in 2012. Since then, a comprehensive program has been ongoing to characterize it as precisely as possible. Can this particle help us solve some of the big open questions in physics?

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19

Orestano, Domizia. "Latest Higgs physics results with the ATLAS detector." International Journal of Modern Physics: Conference Series 39 (January 2015): 1560091. http://dx.doi.org/10.1142/s2010194515600915.

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This report presents the investigations on the recently discovered scalar boson by the ATLAS experiment at the CERN Large Hadron Collider. The latest results fully exploit the data collected during LHC Run 1 to measure the properties of the new boson and within the current sensitivity confirm the identification of this particle with the Higgs boson of the Standard Model.

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Çiftçi, R., A. K. Çiftçi, and S. Sultansoy. "Possible Impact of the Fourth-Generation Quarks on Production of a Charged Higgs Boson at the LHC." ISRN High Energy Physics 2012 (January 26, 2012): 1–8. http://dx.doi.org/10.5402/2012/341643.

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We investigate the impact of the fourth-generation quarks on production and decays of the charged Higgs boson at CERN Large Hadron Collider (LHC) with 14 TeV center of mass energy. The signal is the process gg→u4¯u4, followed by u4¯→W−b¯ and u4→h+b decays with subsequent h+→tb̅ and corresponding hermitic conjugates. It is shown that if mu4=400 GeV, then considered process will provide unique opportunity to discover charged Higgs boson with mass range of 200 to 350 GeV at the LHC.

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21

LIU, YAO-BEI, and JIE-FEN SHEN. "ASSOCIATED PRODUCTION OF THE CHARGED HIGGS BOSON AND SINGLE TOP QUARK AT THE LHC." Modern Physics Letters A 24, no. 02 (January 20, 2009): 143–50. http://dx.doi.org/10.1142/s0217732309026711.

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The left–right twin Higgs (LRTH) model predicts the existence of the charged Higgs ϕ±. In this paper, we study the production of the charged Higgs boson ϕ- with single top quark via the process bg → tϕ- at the CERN Large Hadron Collider (LHC). The numerical results show that the production cross-section can reach the level of 10 pb in the reasonable parameter space of the LRTH model. We expect that, as long as it is not too heavy, the possible signatures of the heavy charged Higgs boson ϕ-> might be detected via the decay mode [Formula: see text] at the LHC experiments.

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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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23

CHANG, JUNG, KINGMAN CHEUNG, PO-YAN TSENG, and TZU-CHIANG YUAN. "VARIOUS MODELS MIMICKING THE SM HIGGS BOSON." International Journal of Modern Physics A 27, no. 28 (November 10, 2012): 1230030. http://dx.doi.org/10.1142/s0217751x1230030x.

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The new particle around 125 GeV observed at the Large Hadron Collider (LHC) is almost consistent with the standard model (SM) Higgs boson, except that the diphoton decay mode may be excessive. We summarize a number of possibilities. While at the LHC the dominant production mechanism for the Higgs boson of SM and some other extensions is via the gluon fusion process, the alternative vector-boson fusion (VBF) is more sensitive to electroweak symmetry breaking. Using the well-known dijet-tagging technique to single out the VBF mechanism, we investigate potential of VBF to discriminate a number of models suggested to give an enhanced inclusive diphoton production rate.

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24

de la Torre, Hector, and Trisha Farooque. "Looking beyond the Standard Model with Third Generation Quarks at the LHC." Symmetry 14, no. 3 (February 23, 2022): 444. http://dx.doi.org/10.3390/sym14030444.

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The Large Hadron Collider (LHC) is at the frontier of collider physics today, probing new physics at unprecedented energy scales. Many theories of physics beyond the Standard Model seek to elucidate the underlying mechanism of electroweak symmetry breaking. Given their large Yukawa couplings to the Higgs boson, third generations quarks of the Standard Model, and especially the top quark, play a key role in such theories. Therefore, new particles predicted by these theories often couple preferentially to top and bottom quarks. The favoured coupling to third generation can also be used to explain recently observed flavour physics anomalies in the LHCb, Babar or Belle experiments. This article will review recent searches for new physics performed by the ATLAS and CMS experiments at the LHC, in final states containing top and bottom quarks. In particular, searches for vector-like quarks, leptoquarks, and heavy scalar and gauge bosons will be discussed.

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Virdee, Tejinder S. "The quest for the Higgs boson at the LHC." International Journal of Modern Physics A 29, no. 09 (April 8, 2014): 1430019. http://dx.doi.org/10.1142/s0217751x14300191.

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In July 2012 the ATLAS and CMS experiments announced the discovery of a Higgs boson, confirming the conjecture put forward by Tom Kibble and others in the 1960s. This article will attempt to outline some of the challenges faced during the construction of the Large Hadron Collider and its experiments, their operation and performance, and selected physics results. In particular, results relating to the new heavy boson will be discussed as well as its properties and the future prospects for the LHC programme.

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Aleksa, Martin. "Noble liquid calorimetry at the LHC and prospects of its application in future collider experiments." Europhysics News 52, no. 3 (2021): 28–31. http://dx.doi.org/10.1051/epn/2021306.

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Calorimetry is an important measurement technique in experimental particle physics. Although calorimeters based on liquefied noble gases were first proposed 50 years ago, they continue to play an important role in modern particle physics and have substantially contributed to the discovery of the Higgs boson at the Large Hadron Collider (LHC) at CERN in 2012.

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RAI, SANTOSH KUMAR. "EFFECTS OF UNIVERSAL EXTRA DIMENSIONS ON HIGGS SIGNALS AT LHC." International Journal of Modern Physics A 23, no. 06 (March 10, 2008): 823–34. http://dx.doi.org/10.1142/s0217751x08038548.

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A major focus at the Large Hadron Collider (LHC) will be on Higgs boson studies and it would be an interesting prospect to simultaneously probe for physics beyond the Standard Model in the Higgs signals. In this work we show as to what extent, the effects of universal extra dimension (UED) can be isolated at the LHC through the Higgs signals. By doing a detailed study of the different uncertainties involved in the measurement of the rates for the process pp →h →γγ, we estimate the extent to which these uncertainties can mask the effects of the contributions coming from UED.

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MYERS, STEPHEN. "THE LARGE HADRON COLLIDER 2008–2013." International Journal of Modern Physics A 28, no. 25 (October 8, 2013): 1330035. http://dx.doi.org/10.1142/s0217751x13300354.

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The Large Hadron Collider (LHC) was first suggested (in a documented way) in 1983 (S. Myers and W. Schnell, Preliminary performance estimates for a LEP proton collider, LEP Note 440, April 1983) as a possible future hadron collider to be installed in the 27 km "LEP" tunnel. More than 30 years later the collider has been operated successfully with beam for three years with spectacular performance and has discovered the long-sought-after Higgs boson. The LHC is the world's largest and most energetic particle collider. It took many years to plan and build this large complex machine which promises exciting, new physics results for many years to come. I describe the LHC design objectives, review some of the more relevant beam effects, define the major accelerator components and parameters, and finally give an overview of the commissioning and operational performance since the initial turn on of the collider. The latter will include the major accident which took place in September 2008 and the subsequent repair and redesign of the faulty components. The first attempt to circulate beam in the LHC in September 2008 were initially very successful. However, after only nine days of preliminary beam commissioning, on 19 September 2008, disaster struck: the last octant was being ramped up in preparation for high energy operation when a magnet interconnect failed and the enormous energy stored in the superconducting magnets was released in an uncontrolled way and damaged around 600 m of the LHC installed equipment. The next 14 months were crucial for the machine. A crash programme for the repair of the damaged sector was initiated as well as in depth studies to understand the cause of the failure and make design changes which would ensure that such an accident could never reoccur in the future. In this paper, the story of the four years of the intensive activity since the accident is described starting with the repair of the damaged area and followed by the three very successful years of beam operation.

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CAI, YI-FU, and DAMIEN A. EASSON. "HIGGS BOSON IN RG RUNNING INFLATIONARY COSMOLOGY." International Journal of Modern Physics D 21, no. 14 (December 2012): 1250094. http://dx.doi.org/10.1142/s0218271812500940.

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An intriguing hypothesis is that gravity may be nonperturbatively renormalizable via the notion of asymptotic safety (AS). We show that the Higgs sector of the standard model (SM) minimally coupled to asymptotically safe gravity can generate the observed near scale-invariant spectrum of the Cosmic Microwave Background through the curvaton mechanism. The resulting primordial power spectrum places an upper bound (CMB) on the Higgs mass, which for finely tuned values of the curvaton parameters, is compatible with the recently released Large Hadron Collider (LHC) data.

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ORESTANO, DOMIZIA. "SEARCH FOR THE STANDARD MODEL HIGGS BOSON WITH THE ATLAS DETECTOR." International Journal of Modern Physics D 22, no. 07 (June 2013): 1330015. http://dx.doi.org/10.1142/s0218271813300152.

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This document presents a brief overview of some of the experimental techniques employed by the ATLAS experiment at the CERN Large Hadron Collider (LHC) in the search for the Higgs boson predicted by the standard model (SM) of particle physics. The data and the statistical analyses that allowed in July 2012, only few days before this presentation at the Marcel Grossman Meeting, to firmly establish the observation of a new particle are described. The additional studies needed to check the consistency between the newly discovered particle and the Higgs boson are also discussed.

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Horváth, Dezso. "Higgs and BSM Studies at the LHC." Universe 5, no. 7 (July 2, 2019): 160. http://dx.doi.org/10.3390/universe5070160.

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The discovery and study of the Higgs boson at the Large Hadron Collider of CERN has proven the validity of the Brout–Englert–Higgs mechanism of mass creation in the standard model via spontaneous symmetry breaking. The new results obtained by the ATLAS and CMS Collaborations at the LHC show that all measured cross-sections agree within uncertainties with the predictions of the theory. However, the standard model has obvious difficulties (nonzero neutrino masses, hierarchy problem, existence of dark matter, non-existence of antimatter galaxies, etc.), which point towards more possible violated symmetries. We first summarize the present status of the studies of the Higgs boson, including the latest results at 13 TeV p-p collision energy, then enlist some of the problems with possible solutions and the experimental situation regarding them.

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Moretti, Stefano, and Shoaib Munir. "Two Higgs Bosons near 125 GeV in the Complex NMSSM and the LHC Run I Data." Advances in High Energy Physics 2015 (2015): 1–16. http://dx.doi.org/10.1155/2015/509847.

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We analyse the impact of explicit CP-violation in the Higgs sector of the Next-to-Minimal Supersymmetric Standard Model (NMSSM) on its consistency with the Higgs boson data from the Large Hadron Collider (LHC). Through detailed scans of the parameter space of the complex NMSSM for certain fixed values of one of its CP-violating (CPV) phases, we obtain a large number of points corresponding to five phenomenologically relevant scenarios containing ∼125 GeV Higgs boson(s). We focus, in particular, on the scenarios where the visible peaks in the experimental samples can actually be explained by two nearly mass-degenerate neutral Higgs boson states. We find that some points corresponding to these scenarios give an overall slightly improved fit to the data, more so for nonzero values of the CPV phase, compared to the scenarios containing a single Higgs boson near 125 GeV.

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Jenni, Peter. "The long journey to the Higgs boson and beyond at the LHC: Emphasis on ATLAS." International Journal of Modern Physics A 31, no. 25 (September 8, 2016): 1630041. http://dx.doi.org/10.1142/s0217751x16300416.

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The journey in search for the Higgs boson with the ATLAS and CMS experiments at the Large Hadron Collider (LHC) at CERN started more than two decades ago. But the first discussions motivating the LHC project dream date back even further into the 1980s. This article will recall some of these early historical considerations, mention some of the LHC machine milestones and achievements, focus as an example of a technological challenge on the unique ATLAS superconducting magnet system, and then give an account of the physics results so far, leading to, and featuring particularly, the Higgs boson results, and sketching finally prospects for the future. With its emphasis on the ATLAS experiment it is complementary to the preceding article by Tejinder S. Virdee which focused on the CMS experiment.

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MA, ERNEST. "SUPERSYMMETRIC AXION-NEUTRINO MODEL WITH A HIGGS HYBRID." International Journal of Modern Physics A 27, no. 11 (April 30, 2012): 1250059. http://dx.doi.org/10.1142/s0217751x12500595.

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In 2001, a supersymmetric model was proposed to relate the axion scale to that of neutrino mass seesaw. Whereas this scenario is realistic, the particles associated with this mechanism are either too heavy or too weakly coupled for them to be observed (other than the axion itself or perhaps the axino). A variation of that model is here proposed which allows significant mixing of the Higgs boson with a new singlet related to the saxion (the scalar partner of the pseudoscalar axion), rendering it possible to be observed at the large hadron collider (LHC). With the addition of exotic color superfields, this also becomes a specific realization of how the production of such a Higgs hybrid may be suppressed or enhanced at the LHC, which is very relevant to ongoing experimental efforts to find the Higgs boson.

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Venditti, Rosamaria. "Prospects for Higgs Boson Measurements and Beyond Standard Model Physics at the High-Luminosity LHC with CMS." EPJ Web of Conferences 192 (2018): 00032. http://dx.doi.org/10.1051/epjconf/201819200032.

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The High-Luminosity Large Hadron Collider (HL-LHC) is a major upgrade of the LHC, expected to deliver an integrated luminosity of up to 3000/fb over one decade. The very high instantaneous luminosity will lead to about 200 proton-proton collisions per bunch crossing (pileup) superimposed to each event of interest, therefore providing extremely challenging experimental conditions. The scientific goals of the HL-LHC physics program include precise measurement of the properties of the recently discovered standard model Higgs boson and searches for beyond the standard model physics (heavy vector bosons, SUSY, dark matter and exotic long-lived signatures, to name a few). In this contribution we will present the strategy of the CMS experiment to investigate the feasibility of such search and quantify the increase of sensitivity in the HL-LHC scenario.

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Biswas, Sanjoy, Emidio Gabrielli, and Barbara Mele. "Dark Photon Searches via Higgs Boson Production at the LHC and Beyond." Symmetry 14, no. 8 (July 26, 2022): 1522. http://dx.doi.org/10.3390/sym14081522.

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Many scenarios beyond the standard model, aiming to solve long-standing cosmological and particle physics problems, suggest that dark matter might experience long-distance interactions mediated by an unbroken dark U(1) gauge symmetry, hence foreseeing the existence of a massless dark photon. Contrary to the massive dark photon, a massless dark photon can only couple to the standard model sector by means of effective higher dimensional operators. Massless dark photon production at colliders will then in general be suppressed at low energy by a UV energy scale, which is of the order of the masses of portal (messenger) fields connecting the dark and the observable sectors. A violation of this expectation is provided by dark photon production mediated by the Higgs boson, thanks to the non-decoupling Higgs properties. Higgs boson production at colliders, followed by the Higgs decay into a photon and a dark photon, provides then a very promising production mechanism for the dark photon discovery, being insensitive in particular regimes to the UV scale of the new physics. This decay channel gives rise to a peculiar signature characterized by a monochromatic photon with energy half the Higgs mass (in the Higgs rest frame) plus missing energy. We show how such resonant photon-plus-missing-energy signature can uniquely be connected to a dark photon production. Higgs boson production and decay into a photon and a dark photon as a source of dark photons is reviewed at the Large Hadron Collider, in light of the present bounds on the corresponding signature by the CMS and ATLAS collaborations. Perspectives for the dark photon production in Higgs-mediated processes at future e+e− colliders are also discussed.

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Yang, Zitao. "Introduction to the Decay of Common Particles." Journal of Physics: Conference Series 2381, no. 1 (December 1, 2022): 012078. http://dx.doi.org/10.1088/1742-6596/2381/1/012078.

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Abstract One of the most important scientific research results in decades is the discovery of a boson particle that has the properties of the Higgs boson, which reiterates the importance of studying particle decay. In this paper, an introduction to common particle decays is given. It contains theoretical and experimental information. On the theoretical side, the paper discusses the concept of decay rate and branching fraction and dives into specific particle decays—the decays of the muon, neutral pion, and neutron. The theoretical results are then correspondingly compared with experimental results. The last section on the decay of the Higgs boson takes an experimental perspective, exploring the details of the data produced at the Large Hadron Collider (LHC).

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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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Ressegotti, Martina. "Overview of the CMS Detector Performance at LHC Run 2." Universe 5, no. 1 (January 9, 2019): 18. http://dx.doi.org/10.3390/universe5010018.

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The Compact Muon Solenoid (CMS) detector is one of the two multipurpose experiments at the Large Hadron Collider (LHC). It has successfully collected data during Run 1 (2010–2013) and achieved important physics results, like the discovery of the Higgs boson announced in 2012. Willing to unravel further open questions not yet explained by the standard model, intense activities have been performed to further improve the detector and the trigger before the LHC restart in 2016 (Run 2), in parallel with the upgrade of the LHC. The achieved global performance of the CMS experiment and of several subdetectors will be presented.

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AZATOV, ALEKSANDR, and JAMISON GALLOWAY. "ELECTROWEAK SYMMETRY BREAKING AND THE HIGGS BOSON: CONFRONTING THEORIES AT COLLIDERS." International Journal of Modern Physics A 28, no. 02 (January 20, 2013): 1330004. http://dx.doi.org/10.1142/s0217751x13300044.

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In this review, we discuss methods of parsing direct information from collider experiments regarding the Higgs boson and describe simple ways in which experimental likelihoods can be consistently reconstructed and interfaced with model predictions in pertinent parameter spaces. We review prevalent scenarios for extending the electroweak symmetry breaking sector and emphasize their predictions for nonstandard Higgs phenomenology that could be observed in large hadron collider (LHC) data if naturalness is realized in particular ways. Specifically we identify how measurements of Higgs couplings can be used to imply the existence of new physics at particular scales within various contexts. The most dominant production and decay modes of the Higgs-like state observed in the early data sets have proven to be consistent with predictions of the Higgs boson of the Standard Model, though interesting directions in subdominant channels still exist and will require our careful attention in further experimental tests. Slightly anomalous rates in certain channels at the early LHC have spurred effort in model building and spectra analyses of particular theories, and we discuss these developments in some detail. Finally, we highlight some parameter spaces of interest in order to give examples of how the data surrounding the new state can most effectively be used to constrain specific models of weak scale physics.

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XING, ZHI-ZHONG. "TEV NEUTRINO PHYSICS AT THE LARGE HADRON COLLIDER." International Journal of Modern Physics A 24, no. 18n19 (July 30, 2009): 3286–96. http://dx.doi.org/10.1142/s0217751x09046886.

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I argue that TeV neutrino physics might become an exciting frontier of particle physics in the era of the Large Hadron Collider (LHC). The origin of non-zero but tiny masses of three known neutrinos is probably related to the existence of some heavy degrees of freedom, such as heavy Majorana neutrinos or heavy Higgs bosons, via a TeV-scale seesaw mechanism. I take a few examples to illustrate how to get a balance between theoretical naturalness and experimental testability of TeV seesaws. Besides possible collider signatures at the LHC, new and non-unitary CP-violating effects are also expected to show up in neutrino oscillations for type-I, type-(I+II) and type-III seesaws at the TeV scale.

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POMAROL, ALEX. "STRONGLY INTERACTING ELECTROWEAK THEORIES AND THEIR FIVE-DIMENSIONAL ANALOGS AT THE LHC." International Journal of Modern Physics A 24, no. 01 (January 10, 2009): 61–80. http://dx.doi.org/10.1142/s0217751x09042785.

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Strongly interacting theories of electroweak (EW) symmetry breaking provide an elegant solution to the hierarchy problem. In these models the EW symmetry can either be broken without a Higgs or by means of a composite Higgs boson. These scenarios have been recently investigated in the framework of five-dimensional warped models that, according to the AdS/CFT correspondence, have a four-dimensional holographic interpretation in terms of strongly coupled field theories. We describe the minimal Higgsless and composite Higgs model and show how they can successfully pass all the electroweak precision tests and solve the flavor problems. We explore the implications of these models at the LHC (Large Hadron Collider).

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

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

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44

Auriemma, Giulio. "LHC, Astrophysics and Cosmology." Acta Polytechnica CTU Proceedings 1, no. 1 (December 4, 2014): 42–48. http://dx.doi.org/10.14311/app.2014.01.0042.

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In this paper we discuss the impact on cosmology of recent results obtained by the LHC (Large Hadron Collider) experiments in the 2011-2012 runs, respectively at √<span style="text-decoration: overline;">s</span> = 7 and 8 TeV. The capital achievement of LHC in this period has been the discovery of a spin-0 particle with mass 126 GeV/c<sup>2</sup>, very similar to the Higgs boson of the Standard Model of Particle Physics. Less exciting, but not less important, negative results of searches for Supersymmetric particles or other exotica in direct production or rare decays are discussed in connection with particles and V.H.E. astronomy searches for Dark Matter.

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Mandrik, Petr. "Constraints on anomalous couplings of the Higgs boson from pair production searches." EPJ Web of Conferences 222 (2019): 04003. http://dx.doi.org/10.1051/epjconf/201922204003.

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The study of the anomalous non-resonant HH production is presented from the point of view of effective field theory (EFT) parameterization. The searches for pp → HH → γγWW, pp → HH → γγbb and pp → HH → bbbb processes by ATLAS experiment at the Large Hadron Collider (LHC) are reproduced. The selection efficiencies and exclusion limits on the HH production cross for different Beyond Standard Model (BSM) EFT benchmark models are obtained using the fast Monte-Carlo simulation of the ATLAS detector.

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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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DASKALAKIS, GEORGIOS. "CMS ECAL PERFORMANCE - TESTBEAM RESULTS." International Journal of Modern Physics A 20, no. 16 (June 30, 2005): 3823–25. http://dx.doi.org/10.1142/s0217751x05027722.

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The Compact Muon Solenoid (CMS) experiment is a general-purpose detector designed to explore the physics of proton-proton collisions at a centre-of-mass energy of 14 TeV over the full range of luminosities expected at the Large Hadron Collider (LHC). The Electromagnetic Calorimeter (ECAL) will play an essential role in the study of the electroweak symmetry breaking, particularly through the exploration of the Higgs boson sector. To evaluate its characteristics, an ECAL prototype was placed in an electron testbeam at CERN. Highlights of results obtained during the test beam campaign are presented.

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Ghaffary, Tooraj. "Comparing production cross-sections for QCD matter, Higgs boson, neutrino with dark energy in accelerating universe." International Journal of Geometric Methods in Modern Physics 14, no. 10 (September 13, 2017): 1750139. http://dx.doi.org/10.1142/s0219887817501390.

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In this research, the production cross-sections for quantum chromodynamics (QCD) matter, neutrino and dark energy due to acceleration of Universe are calculated. To obtain these cross-sections, the Universe production cross-section is multiplied by the particle or dark energy distribution in accelerating Universe. Also, missing cross-section for each matter and dark energy due to formation of event horizon is calculated. It is clear that the cross-section of particles produced near event horizon of Universe is much larger for higher acceleration of Universe. This is because as the acceleration of Universe becomes larger, the Unruh temperature becomes larger and the thermal radiations of particles are enhanced. There are different channels for producing Higgs boson in accelerating Universe. Universe may decay to quark and gluons, and then these particles interact with each other and Higgs boson is produced. Also, some Higgs bosons are emitted directly from event horizon of Universe. Comparing Higgs boson cross-sections via different channels, it is observed that at lower acceleration, [Formula: see text], the Universe will not be able to emit Higgs, but is still able to produce a quark and eventually for [Formula: see text] the Universe can only emit massless gluons. As the acceleration of Universe at the large hadron collider (LHC) increases, [Formula: see text], most of Higgs bosons production will be due to Unruh effect near event horizon of Universe. Finally comparing the production cross-section for dark energy with particle cross-sections, it is found that the cross-section for dark energy is dominated by QCD matter, Higgs boson and neutrino. This result is consistent with previous predictions for dark energy cross-section.

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KIDONAKIS, NIKOLAOS. "NEXT-TO-NEXT-TO-LEADING ORDER SOFT AND VIRTUAL CORRECTIONS FOR QCD, HIGGS AND SUSY PROCESSES." Modern Physics Letters A 19, no. 06 (February 28, 2004): 405–19. http://dx.doi.org/10.1142/s0217732304013532.

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We review recent advances in the calculation of higher-order soft-gluon corrections for a variety of QCD, Higgs, and SUSY processes in hadron colliders. A unified approach and master formulas for next-to-next-to-leading order soft and virtual corrections are discussed. We present some applications of the formalism to top quark pair production at the Tevatron and the LHC, top production via anomalous couplings in flavor-changing neutral-current processes, W boson hadroproduction at large transverse momentum, and charged Higgs production at the LHC.

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Virdee, Tejinder Singh. "The long journey to the Higgs boson and beyond at the LHC: Emphasis on CMS." International Journal of Modern Physics A 31, no. 32 (November 14, 2016): 1630058. http://dx.doi.org/10.1142/s0217751x16300581.

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Since 2010 there has been a rich harvest of results on standard model physics by the ATLAS and CMS experiments operating on the Large Hadron Collider. In the summer of 2012, a spectacular discovery was made by these experiments of a new, heavy particle. All the subsequently analysed data point strongly to the properties of this particle as those expected for the Higgs boson associated with the Brout–Englert–Higgs mechanism postulated to explain the spontaneous symmetry breaking in the electroweak sector, thereby explaining how elementary particles acquire mass. This article focuses on the CMS experiment, the technological challenges encountered in its construction, describing some of the physics results obtained so far, including the discovery of the Higgs boson, and searches for the widely anticipated new physics beyond the standard model, and peer into the future involving the high-luminosity phase of the LHC. This article is complementary to the one by Peter Jenni4 that focuses on the ATLAS experiment.

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