Готові списки джерел за темами / Double Higgs production

Добірка наукової літератури з теми "Double Higgs production"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Double Higgs production"

1

Ahmed, Ijaz. "Sources of Charged Higgs Pair through Double or Triple Higgs Production at Linear Colliders." Advances in High Energy Physics 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/6139250.

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Анотація:
The production of triple Higgs (H+H-H0), (H+H-h0) and pairwise charged Higgs boson (H+H-) is studied in the context of future linear colliders within the two-Higgs-doublet model (2HDM) type II. The aim is to compare sources of charged Higgs pair through the above processes, that is, double and triple Higgs production. Cross sections are calculated at the leading order in 2HDM type II and Minimal Supersymmetric Standard Model (MSSM). Several orders of magnitude (~104) enhancement are observed in 2HDM compared to MSSM, while no sizable enhancement is seen in muon collider versus electron-positron collider. The analysis is based on a heavy charged Higgs with mass above 500 GeV. It is found that double charged Higgs production cross section (being the same in 2HDM and MSSM) is few femtobarns, while the triple Higgs production cannot exceed a fraction of femtobarn within the parameter space under study.
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2

Arhrib, Abdesslam, Rachid Benbrik, Chuan-Hung Chen, Renato Guedes, and and Rui Santos. "Double neutral Higgs production in the two-Higgs doublet model at the LHC." Journal of High Energy Physics 2009, no. 08 (August 11, 2009): 035. http://dx.doi.org/10.1088/1126-6708/2009/08/035.

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3

Glover, E. W. N., and A. D. Martin. "Double Higgs boson production in Z decay." Physics Letters B 226, no. 3-4 (August 1989): 393–96. http://dx.doi.org/10.1016/0370-2693(89)91217-3.

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4

Hashemi, M., and I. Ahmed. "Observability of triple or double charged Higgs production in two Higgs doublet model type II at an e+e- linear collider." International Journal of Modern Physics A 30, no. 04n05 (February 11, 2015): 1550022. http://dx.doi.org/10.1142/s0217751x15500220.

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Анотація:
In this paper the charged Higgs signal through triple or double Higgs production in a two Higgs doublet model (2HDM) type II is studied. The main production process is e+e- →H+H-H0 followed by the charged Higgs decay to a pair of τν and the neutral Higgs decay to [Formula: see text]. The alternative process H+W-H0 is also included as a source of charged Higgs signal in the analysis. The focus is on a future e+e- linear collider operating at [Formula: see text]. The final state under consideration [Formula: see text] is suitable for electroweak background rejection using the b-tagging tools. It is shown that although the signal cross-section is small, with a reasonable background suppression, high signal significance values are achievable at an integrated luminosity 500 fb-1 depending on the charged Higgs mass, tan β and the CP-odd neutral Higgs mass. Finally results are quoted in terms of the signal significance for charged Higgs in the mass range 160 < mH± < 400 GeV .
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5

Guo, Yu-Chen, Chong-Xing Yue, and Zhi-Cheng Liu. "Double elementary Goldstone Higgs boson production in future linear colliders." International Journal of Modern Physics A 33, no. 08 (March 20, 2018): 1850038. http://dx.doi.org/10.1142/s0217751x18500380.

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Анотація:
The Elementary Goldstone Higgs (EGH) model is a perturbative extension of the Standard Model (SM), which identifies the EGH boson as the observed Higgs boson. In this paper, we study pair production of the EGH boson in future linear electron positron colliders. The cross-sections in the TeV region can be changed to about −27%, 163% and −34% for the [Formula: see text], [Formula: see text] and [Formula: see text] processes with respect to the SM predictions, respectively. According to the expected measurement precisions, such correction effects might be observed in future linear colliders. In addition, we compare the cross-sections of double SM-like Higgs boson production with the predictions in other new physics models.
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6

Petrov, V. A., and R. A. Ryutin. "Exclusive double diffractive Higgs boson production at LHC." European Physical Journal C 36, no. 4 (August 2004): 509–13. http://dx.doi.org/10.1140/epjc/s2004-01972-4.

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7

KEUNG, WAI-YEE. "DOUBLE HIGGS FROM W-W FUSION." Modern Physics Letters A 02, no. 10 (October 1987): 765–70. http://dx.doi.org/10.1142/s0217732387000951.

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Анотація:
We study the double Higgs boson production in pp collider at SSC energy via W-W fusion. The calculation are based on the exact CALKUL method. We also checked the result with the equivalent WLWL approximation.
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8

Han, Jinzhong, Bingfang Yang, Ning Liu, and Jitao Li. "Higgs boson production in the U(1)B−L model at the ILC." International Journal of Modern Physics A 31, no. 17 (June 20, 2016): 1650099. http://dx.doi.org/10.1142/s0217751x16500998.

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Анотація:
In the framework of the minimal [Formula: see text] extension of the Standard Model, we investigate the Higgs boson production processes [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] at the International Linear Collider (ILC). We present the production cross-sections, the relative corrections and compare our results with the expected experimental accuracies for Higgs decay channel [Formula: see text]. In the allowed parameter space, we find that the effects of the three single Higgs boson production processes might approach the observable threshold of the ILC. But the Higgs signal strengths [Formula: see text] of the two double Higgs boson production processes are all out of the observable threshold so that these effects will be difficult to be observed at the ILC.
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9

Casalbuoni, R., and L. Marconi. "The linear BESS model and double Higgs-strahlung production." Journal of Physics G: Nuclear and Particle Physics 29, no. 6 (April 22, 2003): 1053–60. http://dx.doi.org/10.1088/0954-3899/29/6/308.

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10

Godunov, S. I., M. I. Vysotsky, and E. V. Zhemchugov. "Double Higgs boson production in the models with isotriplets." Ядерная физика и инжиниринг 5, no. 9 (2014): 756–59. http://dx.doi.org/10.1134/s2079562914080144.

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Більше джерел

Дисертації з теми "Double Higgs production"

1

Vásquez, Tocora Andrés Felipe. "Enhancement in the double Higgs boson production by e+ e− annihilation and physics beyond the standard model." São Paulo, 2018. http://hdl.handle.net/11449/157221.

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Анотація:
Orientador: Rogério Rosenfeld
Coorientador: Alberto Tonero
Banca: Ricardo D'Elia Matheus
Banca: Enrico Bertuzzo
Abstract: The main goal of this dissertation is to show the enhancement of the cross-section for the double Higgs production through pair annihilation by including effective interactions and through the non-perturbative Sommerfeld effect. Bounds to some Wilson coefficients were obtained from such enhancement, this in the scenarios of the future e+ e− -colliders (FCC-ee, ILC, CLIC). In order to achieve this, some computational tools were implemented: FeynRules, FeynArts, FormCalc, and LoopTools. It is also shown the enhancement of the double Higgs production in 2HDM and MSSM, discussing the general framework of these two models. In addition, it is studied the threshold behavior of the cross-section for the double Higgs production when a hidden sector couples to the Higgs boson, yielding resonances below the threshold energy due to non-perturbative effects. We study the Sommerfeld effect in the double Higgs production in the scenario of e+ e− -colliders. The enhancement is discussed as generated from a hidden sector coupled to the Higgs boson. Below and above threshold enhancements are presented. Such analysis is of importance in the ILC project, which will operate up to the threshold energy √s = 250 GeV. The results has been achieved by the use of computational tools like FeynArts, FormCalc, and LoopTools
Resumo: O objetivo principal dessa dissertação é, mostrar o aprimoramento da seção de choque para a produção em dobro dos bósons de Higgs, por meio de aniquilação de pares, incluindo interações efetivas e através do efeito não perturbativo de Sommerfeld. De tais aprimoramentos, os limites para alguns coeficientes de Wilson foram obtidos, isso nos cenários de futuros aceleradores de e+e- (FCC-ee, ILC, CLIC). Para atingir estes resultados, algumas ferramentas computacionais foram implementadas: FeynRules, FeynArts, FormCalc e LoopTools. Também, é mostrado o aprimoramento da produção em dobro de bósons de Higgs no "2HDM" e "MSSM", discutindo o marco geral desses dois modelos. Além disso, foi estudado o comportamento, perto do limite de produção, da seção de choque da produção em dobro dos bósons de Higgs, quando um setor escondido é acoplado ao Higgs, produzindo ressonâncias abaixo da energia limite de produção, devido à efeitos não perturbativos
Mestre
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2

Di, Domenico Franco Maria Rosaria. "A new neural network to select the b-jet pair from H -> bb in HH -> bbtautau searches at CMS." Doctoral thesis, Università di Siena, 2021. http://hdl.handle.net/11365/1144841.

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Анотація:
This thesis presents the search for non-resonant double Higgs boson (HH) production via gluon-gluon fusion (GGF) and vector boson fusion (VBF) mechanisms. The HH production gives access to two fundamental parameters of the SM: the Higgs boson trilinear self-coupling (λHHH), and the coupling between two Higgs bosons and two vector bosons (λ2V), via the measurement of the GGF and VBF cross sections. These parameters are sensitive to the presence of physics beyond the Standard Model. The investigated final state has one of the Higgs bosons decaying into two b-quarks and the other decaying into two τ leptons (HH → b¯bτ+τ−). This process is studied through the examination of the three decay modes of the τ+τ− system: τhτh, where τh means a τ which decays into hadrons plus a ντ , and τℓτℓ (with ℓ denoting either an electron or a muon). The search uses data from proton-proton collisions at a centerof- mass energy of √s = 13TeV recorded with the Compact Muon Solenoid (CMS) detector at the LHC, corresponding to an integrated luminosity of 137.1 fb−1. The new techniques employed in the analysis allowed for a major improvement of the signal sensitivity compared to the previously published CMS results. Among these new techniques, a novel neural network, HH-Btag, is used to improve the selection of the b-jet pair forming the HH→b¯b with respect to the previous methods. HH-Btag has been designed and optimized for the searches of resonant and non-resonant production of the HH in the aforementioned final state. The performance of the algorithm with respect to their predecessors are evaluated under different hypotheses of mass and of spin in the case of resonant production, and as a function of couplings modifiers in the case of non-resonant production, in order to cover a large phase space of the possible scenario. The internal CMS collaboration review of the analysis started in April 2021 and is still ongoing, thus the statistical analysis of the results is carried out without the inclusion of the observed data (blind analysis), and only expected results from standard model (SM) predictions are reported. The 95% Confidence Level upper limit on the total (GGF + VBF) cross section times branching fraction expected from SM is 10.88 fb (equivalent to 4.55 times the SM value). The study of the VBF process, done for the first time in this analysis, resulted in an exclusion limit on the production cross section expected via VBF of 237.3 fb (137.5 times the SM value).
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3

Zhang, Ruiqi. "Search for the W ± W ± W ∓ production and the doubly charged higgs with the Atlas detector." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0434/document.

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Анотація:
L’expérience ATLAS (A Toroidal LHC Apparatus), collaboration de plus de 3000 scientifiques dans le monde, mène des recherches auprès du grand collisionneur de hadron (LHC). Celui-ci a produit des collisions de faisceaux de protons à une énergie dans le centre de masse de 7 TeV en 2011 et 8 TeV en 2012, période appelée Run1 et représentant 20.3 fb−1 de luminosité intégrée, puis en 2015 et 2016 à 13 TeV pour le Run 2 avec 36.1 fb−1. Le détecteur généraliste ATLAS a un riche potentiel de mesures précises du Modèle Standard (SM) et de recherche de phénomènes de nouvel physique. Deux analyses de physiques sont ici présentées. La première consiste à rechercher dans les données Run 1 la production de tri-bosons, W±W±W∓, se désintégrant totalement ou partiellement en leptons et à étudier le couplage de jauge quartique anormal (aQGC). Le nombre d’événements observés est en accord avec les prédictions du SM. La limite supérieure observée à 95% CL sur la section efficace W±W±W∓ SM est de 730 fb avec une limite attendue de 560 fb en l’absence de production W±W±W∓. La deuxième analyse présentée est la recherche du boson de Higgs doublement chargé effectuée sur les données du Run 2. Ce boson est prédit par un modèle qui prolonge le SM pour permettre des neutrinos massif. Ce modèle introduit plusieurs bosons de Higgs dont l'un est le H±±. Le cas où ce dernier se désintègre en bosons W avec un état final à deux leptons de même charge est plus particulièrement étudié. Le bruit de fond total estimé est en accord avec les données et aucun excès significatif n’est observé. Des limites supérieures sont déduites et le modèle considéré est exclus à 95% CL pour MH±± < 220 GeV
The ATLAS (A Toroidal LHC Apparatus) experiment, a collaboration of more than 3,000 scientists worldwide, is conducting research at the Large Hadron Collider (LHC). It produced proton beam collisions at an energy in the center of mass of 7 TeV in 2011 and 8 TeV in 2012, period called Run1 and representing 20.3 fb-1 of integrated luminosity, then in 2015 and 2016 at 13 TeV for Run 2 with 36.1 fb-1. The ATLAS general purpose detector has a rich potential for accurate Standard Model (SM) measurements and the search for new physics phenomena. Two physics analyzes are presented here. The first is to search the Run 1 data for tri-bosons production, W ± W ± W∓, totally or partially decayed into leptons and to study abnormal quartic gauge coupling (aQGC). The number of observed events is consistent with the SM predictions. The observed upper limit at 95% CL on the W ± W ± W∓ SM cross section is 730 fb with an expected limit of 560 fb in the absence of W ± W ± W∓ production. The second analysis presented is the search for the doubly charged Higgs boson carried out on the Run 2 data. This boson is predicted by a model that extends the SM to allow massive neutrinos. This model introduces several Higgs bosons, one of which is the H ±±. The case where this latter decays in bosons W with a final state with two leptons of the same charge is more particularly studied. The estimated total background is in agreement with the data and no significant excess is observed. Upper limits are deduced and the model considered is excluded at 95% CL for MH ±± <220 GeV
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4

Dumitriu, Ana Elena. "Study of the Higgs production in association with tt quarks." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0295/document.

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Анотація:
Le travail scientifique présenté dans cette thèse s’appuie sur des collisions proton proton, à 13 TeV dans le centre de masse, produite par le grand collisionneur de Hadron (LHC) et enregistrées entre 2015 et 2017 par le détecteur ATLAS. Après une brève introduction sur le programme de physique du LHC, le premier chapitre donne un aperçu complet du contexte et des motivations théorique. Ensuite une description complète du détecteur ATLAS et plus généralement de l’ensemble expérimental est donnée. Le troisième chapitre traite d’une des mesures des performances du calorimètre électromagnétique ATLAS, à savoir l’étude des efficacités identification électronique à l’aide de W se désintégrant en électrons et neutrinos.Dans les chapitres suivants, le coeur de cette thèse, la recherche et l’étude de la production associée de boson de Higgs avec une paire de quark top, appelée production ttH, est traitée dans le schéma du modèle Standard et au-delà. L’observation de la production ttH avec le détecteur ATLAS a été récemment annoncée en 2018 et représente une étape importante pour le domaine de la physique des hautes énergies. Afin d’élargir le spectre de cette analyse tth au-delà du SM, cet état final du canal 4L a aussi été étudié dans le cadre de la recherche de bosons de Higgs doublement chargés se désintégrant en W$^{\pm}$W$^{\pm}$, H$^{\pm \pm} \rightarrow $ W$^{\pm}$W$^{\pm}$. En conclusions, les perspectives sur les futurs résultats scientifiques dans le modèle Standard (SM) ainsi que au-delà de SM (BSM) qui pourraient être atteint en utilisant les statistiques complètes des Run1 et Run2 combinés sont donnés
The scientific work presented in this thesis is based on proton proton collision produced, at 13 TeV in the center of mass, created by the Large Hadron Collider (LHC) and recorded between 2015 and 2017 by the ATLAS detector.After a short introduction on the physics program at LHC, the first chapter gives a comprehensive overview of the theoretical context and motivation. Then a complete description of the ATLAS detector and more generally the experimental setup is given with a highlight on the different physics objects used in this research.The third chapter is dealing with a measure of the performances of the ATLAS electromagnetic calorimeter, namely the study of the electron identification efficiencies using W decaying into electrons and neutrinos events.In the following chapters, the core of this thesis work, the search and study of the associated Higgs boson production with top quark pair, so-called ttH production, within the Standard Model schema and beyond is treated. The observation for ttH production with the ATLAS detector recently announced in 2018 represents a significant milestone for the High-Energy Physics field. In order to broaden the spectrum of this ttH analysis beyond the SM, this 4L channel final states was also studied in the context of the search for doubly charged Higgs boson decaying into W±W±, H±±→W±W±.In conclusions, future prospects in Standard Model (SM) as well as Beyond SM (BSM) scientific results that could be reached using the full Run1 and Run2 combined available statistics are given
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5

Galler, Peter. "Effects of heavy Higgs bosons in the hadronic production of top-quark pairs including QCD corrections." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/18796.

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Анотація:
In dieser Disseratation wird eine mögliche Erweiterung des Standardmodells der Elementarteilchen (SM) im Higgs-Sektor mithilfe von Topquarkpaarproduktion am Large Hadron Collider untersucht. Insbesondere wird dabei auf das sogenannte Zwei-Higgs-Duplettmodell eingegangen. Dieses Modell führt mehrere Spin-0 Bosonen (auch Higgsbosonen genannt) zusätzlich zum SM-Higgsboson ein. Dabei wird in dieser Arbeit von der Annahme ausgegangen, dass diese zusätzlichen Higgsbosonen schwer genug sind um in ein Top-Antitop-Paar zu zerfallen. Somit können die experimentellen Signaturen dieser neuen Teilchen mit Hilfe von Observablen der Topquarkpaarproduktion untersucht werden. Dazu wird die resonante Erzeugung von schweren Higgsbosonen und deren Zerfall in Topquarkpaare bis einschließlich Quantenkorrekturen in der nächst-zu-führenden Ordnung (NLO) in der QCD-Kopplungskonstanten berechnet. Weiterhin wird die volle Spininformation des Top-Antitop-Paares beibehalten, welche die Analyse von spinabhängigen Observablen erlaubt. Diese können, insbesondere in Falle von Top-Antitop-Spinkorrelationen, sehr sensitiv auf Effekte schwerer Higgsbosonen sein. Dies zeigt sich besonders in Vergleich zu spinunabhängigen Observablen. Die Sensitivität von spinabhängigen Observablen kann zudem noch durch entsprechende Schnitte auf den Phasenraum von Top- und Antitopquark verstärkt werden. In dieser Dissertation wird ein Verfahren vorgestellt, mit dessen Hilfe sich die Spinkorrelationen identifizieren lassen, welche die größte Sensitivität auf die Effekte schwerer Higgsbosonen aufweisen. Außerdem wird durch die Berechnung der Beiträge zur NLO u.a. gezeigt, dass diese Beiträge wichtig sind um aussagekräftige und robuste Observablen zu definieren. Die Ergebnisse der NLO, die in dieser Arbeit vorgestellt werden, sind die ersten ihrer Art für die resonante Erzeugung von schweren Higgsbosonen und deren Zerfall in Topquarkpaare.
In this dissertation a possible extension of the standard model of particle physics (SM) in the Higgs sector is investigated using top-quark pair production at the Large Hadron Collider as a probe. In particular, the so-called two-Higgs-doublet model (2HDM) is studied. The 2HDM introduces several spin-0 bosons (which are also called Higgs bosons) in addition to the SM Higgs boson. In this thesis these additional Higgs bosons are assumed to be heavy enough to decay into a top-antitop quark pair. Thus, the experimental signatures of these new particles can be studied through observables of top-quark pair production. To this end the resonant production of heavy neutral Higgs bosons and their decay into top-quark pairs in calculated up to next-to-leading order corrections in the QCD coupling constant retaining the full spin information of the top-antitop pair. This allows to analyse spin dependent observables which can be more sensitive to effects of heavy Higgs bosons than spin independent ones especially in the case of top-antitop spin correlations. The additional application of kinematical cuts on the phase space of top and antitop quarks can enhance the sensitivity further. In this thesis a method is presented that can be used to construct the spin correlation which is most sensitive to the effects of heavy Higgs bosons on top-quark pair production. Furthermore, it is shown that the next-to-leading order corrections are required to construct observables which entail robust predictions. The results for the next-to-leading order in the QCD coupling constant presented in this thesis were the first ones given for resonant heavy Higgs production and decay into top-quark pairs.
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6

Chevallier, Florent. "Mesure de la section efficace de production de quarks top en paires dans le canal lepton+jets à DØ et à ATLAS et interprétation en terme de boson de Higgs chargé dans ATLAS." Université Joseph Fourier (Grenoble), 2007. http://www.theses.fr/2007GRE10054.

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Анотація:
La mise en évidence de nouvelle physique est l'un des enjeux des expériences auprès des grands collisionneurs TeVatron et LHC. Le quark top se place dans ce contexte de recherche. Des mesures de couplages et de propriétés du quark top non conformes aux prédictions théoriques seraient les premiers effets indirects d'une physique non décrite par le Modèle Standard. Le travail décrit dans cette thèse porte sur l'étude de la section efficace de production de quarks top par interaction forte au sein des deux collaborations D0 et ATLAS. Mon travail à D0 a tout d'abord consisté en l'amélioration de la reconstruction des électrons de faible impulsion au sein de jets. Ce nouvel algorithme peut désormais être utilisé pour identifier les jets de quarks b, produits dans les événements top-antitop recherchés. Ce travail s'est poursuivi par une analyse de mesure de la section efficace de production de paires de quarks top, avec 420 pb-1 de données de l'expérience D0. Les résultats de cette analyse sont en accord avec les prédictions du Modèle Standard. Dans l'expérience ATLAS, mon travail a consisté à élaborer une procédure de sélection des événements top-antitop, en adaptant les connaissances et les techniques issues de l'expérience D0 à l'environnement plus exigeant des collisions du LHC. Cette analyse a permis d'identifier les sources d'incertitudes qui auront un impact sur la mesure. Pour une année de fonctionnement du détecteur à basse luminosité, cette section efficace pourrait être mesurée avec une précision de quelques pourcents. Cette sensibilité permettrait de déceler des signes de nouvelle physique. La phénoménologie des événements top-antitop est modifiée par la présence de bosons de Higgs chargés apparaissant dans des modèles standard non minimaux. L'analyse effectuée dans ce nouveau cadre théorique a ainsi montré qu'une découverte serait possible pour certaines régions de l'espace des paramètres
One of the main challenges of the current and future colliders TeVatron and LHC is the discovery of physics beyond the Standard Model. This goal may be accessible through precision measurements in the top quark sector. Deviations from theoretical predictions may bring to light the first indirect signs of new physics. The work exposed in this thesis deals with the production cross-section of top quark pairs via the strong interaction, within both D0 and ATLAS collaborations. Firstly, I've worked at D0 on the improvement of the reconstruction of soft electrons, in order to tag b-jets produced in top-antitop quarks events. Then I focused myself on the measurement of the top quark pair production cross-section with 420 pb-1 of D0 data. The measured cross-section is in agreement with the Standard Model expectations. In the ATLAS experiment, I tried to develop a procedure in ordrer to select top quark pair events, using the knowledge and the techniques from the D0 experiment. This work also highlighted the main systematic sources that can affect the sensitivity of the measurement. After one year of data taking at low luminosity, this preliminary analysis obtains a sensitivity at a few percent level, leading to a good discovery potential of new physic signs, like charged Higgs bosons. These new particles appear in non minimal standard models, and modify the phenomenology of top pair events. This new analysis has shown a good sensitivity for some regions of the parameter space
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7

Chevallier, Florent. "Mesure de la section efficace de production de quarks top en paires dans le canal lepton+jets à D0 et à ATLAS et interprétation en terme de boson de Higgs chargé dans ATLAS." Phd thesis, 2007. http://tel.archives-ouvertes.fr/tel-00181009.

Повний текст джерела
Анотація:
La mise en évidence de nouvelle physique est l'un des enjeux des expériences auprès des grands collisionneurs TeVatron et LHC. Le quark top se place dans ce contexte de recherche. Des mesures de couplages et de propriétés du quark top non conformes aux prédictions théoriques seraient les premiers effets indirects d'une physique non décrite par le Modèle Standard.

Le travail décrit dans cette thèse porte sur l'étude de la section efficace de production de quarks top par interaction forte au sein des deux collaborations D0 et ATLAS.

Mon travail à D0 a tout d'abord consisté en l'amélioration de la reconstruction des électrons de faible impulsion au sein de jets. Ce nouvel algorithme peut désormais être utilisé pour identifier les jets de quarks b, produits dans les événements top-antitop recherchés. Ce travail s'est poursuivi par une analyse de mesure de la section efficace de production de paires de quarks top, avec 420 pb-1 de données de l'expérience D0. Les résultats de cette analyse sont en accord avec les prédictions du Modèle Standard.

Dans l'expérience ATLAS, mon travail a consisté à élaborer une procédure de sélection des événements top-antitop, en adaptant les connaissances et les techniques issues de l'expérience D0 à l'environnement plus exigeant des collisions du LHC. Cette analyse a permis d'identifier les sources d'incertitudes qui auront un impact sur la mesure. Pour une année de fonctionnement du détecteur à basse luminosité, cette section efficace pourrait être mesurée avec une précision de quelques pourcents. Cette sensibilité permettrait de déceler des signes de nouvelle physique. La phénoménologie des événements top-antitop est modifiée par la présence de bosons de Higgs chargés apparaissant dans des modèles standard non minimaux. L'analyse effectuée dans ce nouveau cadre théorique a ainsi montré qu'une découverte serait possible pour certaines régions de l'espace des paramètres.
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Частини книг з теми "Double Higgs production"

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Meadowcroft, James. "Governing the transition to a new energy economy." In Energy... beyond oil. Oxford University Press, 2007. http://dx.doi.org/10.1093/oso/9780199209965.003.0015.

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Анотація:
Over the next two or three decades a new energy economy should begin to take shape in the developed industrial countries. This will not be a post-fossil fuel economy. But it could be an economy in which non-fossil sources play a more important role; where efficiency in the production, distribution, and use of energy is significantly enhanced; where new storage and carrier technologies are being adopted; and where the fossil sector is being transformed by the imperative of carbon sequestration. Such an energy economy would represent a critical staging post in a much longer transition towards a carbon neutral, low-environmental impact, energy system. The extent to which a new energy economy actually materializes will depend on many factors including the pace and orientation of international economic development, the rate and direction of technological innovation and diffusion, as well as patterns of geo-strategic cooperation and conflict. But there is no doubt the trajectory will be significantly influenced by political decisions and government action on the energy file. This is the issue with which this chapter is concerned. At the moment there are two main political drivers for the move to look beyond oil. First, there are supply concerns. Increasing global demand, production bottlenecks, and political instability have pushed oil prices towards historic highs. Although the oil intensity (oil consumption per unit of GDP) of the OECD economies is less than during the oil crises of the 1970s (IMF, 2005), there is no doubt that the long term economic impact of high oil prices would be considerable. There are also critical issues associated with the geographic distribution of reserves. Production from areas opened up following the turbulence of the early 1970s (such as the North Sea) is peaking. In coming years the United States will be more heavily dependent on imported oil, with an increasing percentage of these imports destined to come from politically volatile areas in the Middle East and Asia. And this presents a serious risk of supply disruption.
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Тези доповідей конференцій з теми "Double Higgs production"

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Bury, Florian. "Double Higgs production at CMS." In 41st International Conference on High Energy physics. Trieste, Italy: Sissa Medialab, 2022. http://dx.doi.org/10.22323/1.414.0507.

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Portales, Louis. "Double Higgs production at the LHC." In Particles and Nuclei International Conference 2021. Trieste, Italy: Sissa Medialab, 2022. http://dx.doi.org/10.22323/1.380.0417.

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Arhrib, Abdesslam, Rachid Benbrik, Cheng-Wei Chiang, John Ellis, Salah Nasri, and Ehab Malkawi. "Double Higgs production in the Two Higgs Doublet Model at the linear collider." In HIGH ENERGY PHYSICS AND APPLICATIONS: Proceedings of the UAE-CERN Workshop. AIP, 2008. http://dx.doi.org/10.1063/1.2927595.

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Royon, Christophe. "Inclusive Higgs production via double pomeron exchange." In International Europhysics Conference on High Energy Physics. Trieste, Italy: Sissa Medialab, 2001. http://dx.doi.org/10.22323/1.007.0038.

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Davies, Joshua, Go Mishima, Matthias Steinhauser, and David Wellmann. "Double Higgs Production in the High Energy Limit." In Loops and Legs in Quantum Field Theory. Trieste, Italy: Sissa Medialab, 2018. http://dx.doi.org/10.22323/1.303.0022.

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Hoff, Jens, and Jonathan Grigo. "Mass-corrections to double-Higgs production & TopoID." In Loops and Legs in Quantum Field Theory. Trieste, Italy: Sissa Medialab, 2014. http://dx.doi.org/10.22323/1.211.0030.

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Ahmed, Ijaz, and Majid HASHEMI. "Charged Higgs through Triple or Double Higgs Production in a General Two Higgs Doublet Model at an e+e- Linear Collider." In Prospects for Charged Higgs Discovery at Colliders. Trieste, Italy: Sissa Medialab, 2015. http://dx.doi.org/10.22323/1.209.0031.

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Dib, Claudio O. "Double Higgs Production at the LHC as a Robust Test of Little Higgs Models." In XXV PHYSICS IN COLLISION: Proceedings of the XXV International Conference on Physics in Collision. AIP, 2006. http://dx.doi.org/10.1063/1.2173599.

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Ortona, Giacomo. "Searches for double Higgs production or decay using the CMS detector." In 38th International Conference on High Energy Physics. Trieste, Italy: Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.282.0404.

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Ran, Kunlin. "Constraints on the Higgs boson self-coupling from the combination of single-Higgs and double-Higgs production analyses performed with the ATLAS experiment." In 40th International Conference on High Energy physics. Trieste, Italy: Sissa Medialab, 2020. http://dx.doi.org/10.22323/1.390.0104.

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Звіти організацій з теми "Double Higgs production"

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Tuttle, Joshua P. A Search for Long-Lived Doubly-Charged Higgs Boson Production in anti-p p Collisions at sqrt(s)=1.96 TeV using RunII CDF. Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/948160.

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Zdrazil, Marian. Search for doubly-charged Higgs Boson production in the decay H++ H-- → μ+μ+μ-μ- with the D0 detector at √s = 1.96-TeV. Office of Scientific and Technical Information (OSTI), серпень 2004. http://dx.doi.org/10.2172/879006.

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Kim, Tae Jeong. Search for Doubly-charged Higgs Boson Production in the Decay H++ H--→ μ+μ+μ-μ- with 1.1 fb-1 at D0 Detector. Office of Scientific and Technical Information (OSTI), червень 2007. http://dx.doi.org/10.2172/935243.

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