Relevant bibliographies by topics / LHC, CMS, Higgs, WW

Academic literature on the topic 'LHC, CMS, Higgs, WW'

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Published: 9 March 2023
Last updated: 10 March 2023

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Journal articles on the topic "LHC, CMS, Higgs, WW"

1

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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Abdeljalil Habjia. "Synthesis on Heavy Higgs from the Standard Model to 2HDM and Beyond." JOURNAL OF ADVANCES IN PHYSICS 18 (October 13, 2020): 110–42. http://dx.doi.org/10.24297/jap.v18i.8881.

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In the context of particle physics, within the ATLAS and CMS experiments at large hadron collider (LHC), this work presents the discussion of the discovery of a particle compatible with the Higgs boson by the combination of several decay channels, with a mass of the order of 125.5 GeV. With increased statistics, that is the full set of data collected by the ATLAS and CMS experiments at LHC ( s1/2 = 7GeV and s1/2 = 8GeV ), the particle is also discovered individually in the channel h-->γγ with an observed significance of 5.2σ and 4.7σ, respectively. The analysis dedicated to the measurement of the mass mh and signal strength μ which is defined as the ratio of σ(pp --> h) X Br(h-->X) normalized to its Standard Model where X = WW*; ZZ*; γγ ; gg; ff. The combined results in h-->γγ channel gave the measurements: mh = 125:36 ± 0:37Gev, (μ = 1:17 ± 0:3) and the constraint on the width Γ(h) of the Higgs decay of 4.07 MeV at 95%CL. The spin study rejects the hypothesis of spin 2 at 99 %CL. The odd parity (spin parity 0- state) is excluded at more than 98%CL. Within the theoretical and experimental uncertainties accessible at the time of the analysis, all results: channels showing the excess with respect to the background-only hypothesis, measured mass and signal strength, couplings, quantum numbers (JPC), production modes, total and differential cross-sections, are compatible with the Standard Model Higgs boson at 95%CL. Although the Standard Model is one of the theories that have experienced the greatest number of successes to date, it is imperfect. The inability of this model to describe certain phenomena seems to suggest that it is only an approximation of a more general theory. Models beyond the Standard Model, such as 2HDM, MSSM or NMSSM, can compensate some of its limitations and postulate the existence of additional Higgs bosons.
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Dordevic, Milos. "Higgs physics at CMS." EPJ Web of Conferences 222 (2019): 01001. http://dx.doi.org/10.1051/epjconf/201922201001.

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The most recent results of a Higgs boson production and properties from the CMS Collaboration using the LHC Run 1 and Run 2 data are reported. These include analyses of a Higgs boson decaying to a pair of photons, four leptons via Z boson pair decays and the associated production of a Higgs boson with top quark pair, predicted by the Standard Model (SM). The studies of a Higgs boson decays to a pair of bottom quarks, a pair of tau leptons and a charm quark pair are also presented. The Higgs boson production via vector boson fusion (VBF) and decaying to invisible particles is reported here as well. The analysis of a Higgs boson decay to a pair of muons is also presented. The study of a Higgs boson pair production at 13 TeV is performed as well and projections of a Higgs boson self couplings together with the couplings to other particles at the HL-LHC are made.
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Kao, Chung, and Joshua Sayre. "Confirming the LHC Higgs discovery with WW." Physics Letters B 722, no. 4-5 (May 2013): 324–29. http://dx.doi.org/10.1016/j.physletb.2013.04.028.

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Matteo, Leonardo Di. "Search for Higgs decaying to WW at CMS." Journal of Physics: Conference Series 455 (August 6, 2013): 012030. http://dx.doi.org/10.1088/1742-6596/455/1/012030.

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

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Searches for the Higgs bosons of the Minimal Supersymmetric Standard Model are discussed at the LHC in the CMS and ATLAS experiments. Results are presented for the scenario which maximizes the mass of the lighter scalar Higgs boson. Low integrated luminosity is assumed.
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Gonzalez Suarez, Rebeca. "Recent CMS results in top and Higgs physics." Modern Physics Letters A 32, no. 29 (September 12, 2017): 1730026. http://dx.doi.org/10.1142/s0217732317300269.

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After the Higgs boson discovery in 2012, the investigation of its properties and compatibility with the Standard Model predictions is central to the physics program of the LHC experiments. Likewise, the study of the top quark is still relevant at the LHC, more than two decades after its discovery at the Tevatron. Top quarks and Higgs bosons are produced at the LHC on a large scale and share a deep connection based on the large mass of the top quark. Both particles provide an excellent laboratory in which to search for new physics: the measurement of their properties tests the foundations of the Standard Model; and they feature prominently in a variety of exotic signals. The coupling of the Higgs boson to the top quark, a fundamental Standard Model parameter, can only be measured directly in processes where the two particles are produced together. The production of a Higgs boson together with one or two top quarks is also sensitive to several exciting new physics effects. A brief overview of the current experimental status of top quark and Higgs boson physics is presented using results from the CMS Collaboration.
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GUNION, JOHN F. "THE ELUSIVE HIGGS BOSON(S)." International Journal of Modern Physics A 25, no. 22 (September 10, 2010): 4163–77. http://dx.doi.org/10.1142/s0217751x10050512.

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We outline the motivations for having a light Higgs boson with fairly SM-like couplings to WW, ZZ but with unusual decays that elude LEP limits and that will also make its detection at the LHC quite challenging. The Next-to-Minimal Supersymmetric Model provides a very appealing model of this type.
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Strologas, John. "Experimental results from CMS." EPJ Web of Conferences 192 (2018): 00005. http://dx.doi.org/10.1051/epjconf/201819200005.

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We present some of the latest results of the CMS experiment, covering analyses in QCD multijet, top, bottom, Higgs, forward/small-x QCD, heavyion, exotic, and supersymmetry physics utilizing LHC integrated luminosity up to ~80 fb-1.
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Mariotti, Chiara. "The Story of a Discovery: How we found the long-sought-after Higgs Boson." Europhysics News 50, no. 5-6 (September 2019): 24–28. http://dx.doi.org/10.1051/epn/2019502.

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The Higgs boson has been discovered in 2012 by the ATLAS and CMS experiments at the LHC, 50 years after its prediction. The scientific and human adventure of this discovery will be summarized in this article, going back to the search at LEP and to the foundation of the LHC Higgs Cross Section working group.
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Dissertations / Theses on the topic "LHC, CMS, Higgs, WW"

1

MASSIRONI, ANDREA. "Search for a Higgs Boson in the H - > WW - > IvIv channel at CMS." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2013. http://hdl.handle.net/10281/40097.

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In this thesis work, the search for a Higgs boson at CMS in the WW fully leptonic decay channel is presented. Two different production mechanisms have been analysed: the Vector Boson Fusion (VBF) and the Higgs-strahlung (VH). Given the leptonic decays of WW, in order to guarantee a good electron reconstruction and identification, the electromagnetic calorimeter alignment has been studied. In addition, both the VBF and the VH analyses relies on the capability of CMS to reconstruct jets: one of the first measurements of CMS, with data collected during 2010 run, looking at the simultaneous production of one central jet and one forward jet, is described. Higgs search analysis optimization, data driven estimation of the main backgrounds and the results obtained with 7 and 8 TeV collisions are reported. The analysis excludes a Higgs boson with 95% confidence level with a mass between 135 and 200 GeV.
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Benaglia, Andrea Davide. "ECAL calibration studies for H > γγ searches and Higgs boson search in the H > WW > 1vq̄q final state with the CMS detector at the LHC." Palaiseau, Ecole polytechnique, 2012. http://tel.archives-ouvertes.fr/index.php?halsid=fj3plg15k2dvvvvogj7v14vhf7&view_this_doc=pastel-00722897&version=1.

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Cette thèse présente le travail de trois ans effectué dans l'expérience CMS, dans le contexte des premières collisions proton-proton du LHC. L'étude porte en particulier sur la recherche du boson de Higgs. Cette particule, dont l'existence est prévue par le Modèle Standard, n'a encore jamais été observée, mais elle est toujours activement l'objet de recherches auprès de collisionneurs à très hautes énergies. Dans le passé récent, les expériences au LEP et Tevatron ont permis d'exclure l'existence du Higgs dans les domaines de masse < 114 GeV/c2 et [147, 179] GeV/c2, avec un intervalle de confiance de 95%. Au moment où le sujet de cette thèse a été décidé, les domaines de masse très faible et très élevé étaient donc les régions les plus intéressantes. Avec les données de collisions de 2011, je me suis occupé de la question de la stabilité et uniformité de la réponse du calorimètre électromagnétique (ECAL). Des électrons isolés, provenant de la désintégration de boson W en en voie électron-neutrino ont été utilisé pour caractériser la réponse du ECAL (corrections locales d'uniformité, corrections de transparence des cristaux, vieillissement des cellules de lecture). Ceci sert de référence pour l'analyse du Boson du Higgs se désintégrant en deux photons, qui est le canal favori pour des hypothèses de masse faible et qui exige une une résolution en énergie optimale pour mieux profiter de la résonance trés étroite du boson du Higgs pour ces masses. L'analyse de physique effectuée dans cette thèse porte sur la recherche de bosons de Higgs dans l'autre région de masse encore permise par les contraintes expérimentales. En particulier, j'ai étudié le canal de désintégration H > WW > lνqq pour des masses du Higgs mH > 2mW. Ce canal est celui qui offre la plus grande section efficace de production (σ × B) pour le boson de Higgs, même s'il est pénalisé par des bruits de fonds de processus standards importants. Une stratégie d'analyse complète a été définie: j'ai étudié les performances pour la physique de la reconstruction et de l'identification des leptons isolés, fortement contribué à la définition et à la caractérisation du déclenchement (trigger) pour ce canal, et procédé à une analyse détaillée des sources d'incertitudes systématiques affectants l'interprétation statistique des résultats. En absence d'une déviation par rapport à l'attendue des bruits de fonds du modèle standard, des limites supérieures sur la masse du boson de Higgs ont été obtenu, entre 320 et 400 GeV/c2 environ
This thesis presents a three-year work in the CMS experiment, in the context of the first LHC proton-proton collisions. In particular, my studies concentrated on Higgs boson searches. This particle, whose existence is predicted by the Standard Model, has not been observed yet, and constitutes the main Physics target of many high-energy colliders. In the recent past, the LEP and Tevatron experiments allowed to exclude, at 95% confidence level, the existence of the Higgs boson for masses below 114 GeV/c2 and in the [147, 179] GeV/c2 mass range. Therefore, at the moment the subject of this thesis was being decided, the very low and very high mass ranges emerged as the most interesting and promising regions. With collision data collected in 2011 I have studied the response stability and uniformity of the electromagnetic calorimeter (ECAL). Isolated electrons from W boson decays into electron- neutrino pairs have been used to characterize the ECAL response (local uniformity corrections, crystal transparency corrections, ageing of the readout channels). These studies are of great rel- evance for Higgs boson searches in the di-photon decay channel, which is the reference analysis for low-mass Higgs hypotheses and demands a supreme energy resolution to profit from the very narrow Higgs resonance. The other experimentally-allowed Higgs mass range has been tackled with the Physics analysis channel described in this thesis. In particular, I have studied the decay channel H → WW > lνqq, for Higgs mass hypotheses well above the 2mW threshold. This channel has the largest effective cross section (σ × B) for the Higgs boson, although the final state is contaminated by large background events from Standard Model sources. A complete analysis strategy has been defined, optimizing the selections that allow to enhance the signal presence in the final set of events. I have studied the performances of lepton reconstruction and identification and contributed to the development and characterization of a trigger, specifically designed for this channel. Finally, all sources of systematic uncertainties that affect the statistical interpretation of the result have been addressed. With no significant excess observed on the expected background yield, an upper limit on the Higgs boson production cross-section has been settled, for Higgs masses between about 320 and 400 GeV/c2
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Delaere, Christophe. "Study of WW decay of a Higgs boson with the ALEPH and CMS detectors." Université catholique de Louvain, 2005. http://edoc.bib.ucl.ac.be:81/ETD-db/collection/available/BelnUcetd-06022006-185157/.

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The Standard Model is a mathematical description of the very nature of elementary particles and their interactions, now seen as relativistic quantum fields. A key feature of the theory is the Brout-Englert-Higgs mechanism, responsible for the spontaneous symmetry breaking of the underlying gauge symmetry, and which implies the existence of a neutral Higgs particle. Searches for the Higgs boson were conducted at the Large Electron Positron collider until 2000 and are still ongoing at the Tevatron collider, but the particle has not been not observed. In order to better constrain models with an exotic electroweak symmetry breaking sector, a search for a Higgs boson decaying into a W pair is carried out with the ALEPH detector on 453 pb-1 of data collected at center-of-mass energies up to 209 GeV. The analysis is optimized for the many topologies resulting from the six-fermion final state. A lower limit at 105.8 GeV/c² on the Higgs boson mass in a fermiophobic Higgs boson scenario is obtained. The ultimate machine for the Higgs boson discovery is the Large Hadron Collider, which is being built at CERN. In order to evaluate the physics potential of the CMS detector, the WH associated production of a Higgs boson decaying into a W pair is studied. Performances of data acquisition and its sophisticated trigger system, particle identification and event reconstruction are investigated by performing a detailed analysis on simulated data. Three-lepton final states are shown to provide interesting possibilities. For an integrated luminosity of 100 fb-1, a potential signal significance of more than 5ó is obtained in the mass interval between 155 and 178 GeV/c². The corresponding precision on the Higgs boson mass and partial decay width into W pairs are evaluated. This channel also provides one of the very few possible avenues towards the discovery of a fermiophobic Higgs boson below 180 GeV/c². These studies required many original technical developments, that are also presented.
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4

BENAGLIA, ANDREA DAVIDE. "Higgs boson search in the H > WW > lv qq final state with the CMS detector at the LHC." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/35028.

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This thesis presents a three-year work in the CMS experiment, in the context of the first LHC proton-proton collisions. In particular, my studies concentrated on Higgs boson searches. This particle, whose existence is predicted by the Standard Model, has not been observed yet, and constitutes the main Physics target of many high-energy colliders. In the recent past, the LEP and Tevatron experiments allowed to exclude, at 95% confidence level, the existence of the Higgs boson for masses below 114 GeV/c2 and in the [147, 179] GeV/c2 mass range. Therefore, at the moment the subject of this thesis was being decided, the very low and very high mass ranges emerged as the most interesting and promising regions. With collision data collected in 2011 I have studied the response stability and uniformity of the electromagnetic calorimeter (ECAL). Isolated electrons from W boson decays into electron- neutrino pairs have been used to characterize the ECAL response (local uniformity corrections, crystal transparency corrections, ageing of the readout channels). These studies are of great rel- evance for Higgs boson searches in the di-photon decay channel, which is the reference analysis for low-mass Higgs hypotheses and demands a supreme energy resolution to profit from the very narrow Higgs resonance. The other experimentally-allowed Higgs mass range has been tackled with the Physics analysis channel described in this thesis. In particular, I have studied the decay channel H > WW >lv qq, for Higgs mass hypotheses well above the 2mW threshold. This channel has the largest effective cross section for the Higgs boson, although the final state is contaminated by large background events from Standard Model sources. A complete analysis strategy has been defined, optimizing the selections that allow to enhance the signal presence in the final set of events. I have studied the performances of lepton reconstruction and identification and contributed to the development and characterization of a trigger, specifically designed for this channel. Finally, all sources of systematic uncertainties that affect the statistical interpretation of the result have been addressed. With no significant excess observed on the expected background yield, an upper limit on the Higgs boson production cross-section has been settled, for Higgs masses between about 320 and 400 GeV/c2.
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Benaglia, Andrea Davide. "ECAL calibration studies for H > gg searches and Higgs boson search in the H > WW > lvqq final state with the CMS detector at the LHC." Phd thesis, Ecole Polytechnique X, 2012. http://pastel.archives-ouvertes.fr/pastel-00722897.

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Cette thèse présente le travail de trois ans effectué dans l'expérience CMS, dans le contexte des premières collisions proton-proton du LHC. L'étude porte en particulier sur la recherche du boson de Higgs. Cette particule, dont l'existence est prévue par le Modèle Standard, n'a encore jamais été observée, mais elle est toujours activement l'objet de recherches auprès de collisionneurs à très hautes énergies. Dans le passé récent, les expériences au LEP et Tevatron ont permis d'exclure l'existence du Higgs dans les domaines de masse < 114 GeV/c2 et [147, 179] GeV/c2, avec un intervalle de confiance de 95%. Au moment où le sujet de cette thèse a été décidé, les domaines de masse très faible et très élevé étaient donc les régions les plus intéressantes. Avec les données de collisions de 2011, je me suis occupé de la question de la stabilité et uniformité de la réponse du calorimètre électromagnétique (ECAL). Des électrons isolés, provenant de la désintégration de boson W en en voie électron-neutrino ont été utilisé pour caractériser la réponse du ECAL (corrections locales d'uniformité, corrections de transparence des cristaux, vieillissement des cellules de lecture). Ceci sert de référence pour l'analyse du Boson du Higgs se désintégrant en deux photons, qui est le canal favori pour des hypothèses de masse faible et qui exige une une résolution en énergie optimale pour mieux profiter de la résonance trés étroite du boson du Higgs pour ces masses. L'analyse de physique effectuée dans cette thèse porte sur la recherche de bosons de Higgs dans l'autre région de masse encore permise par les contraintes expérimentales. En particulier, j'ai étudié le canal de désintégration H > WW > lνqq pour des masses du Higgs mH > 2mW. Ce canal est celui qui offre la plus grande section efficace de production (σ × B) pour le boson de Higgs, même s'il est pénalisé par des bruits de fonds de processus standards importants. Une stratégie d'analyse complète a été définie: j'ai étudié les performances pour la physique de la reconstruction et de l'identification des leptons isolés, fortement contribué à la définition et à la caractérisation du déclenchement (trigger) pour ce canal, et procédé à une analyse détaillée des sources d'incertitudes systématiques affectants l'interprétation statistique des résultats. En absence d'une déviation par rapport à l'attendue des bruits de fonds du modèle standard, des limites supérieures sur la masse du boson de Higgs ont été obtenu, entre 320 et 400 GeV/c2 environ.
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DI, MATTEO LEONARDO. "CMS ECAL intercalibration with electrons from W and Z decays and Search for the Standard Model Higgs boson in the H > WW > lvqq channel with the CMS detector." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2013. http://hdl.handle.net/10281/41813.

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The usage of isolated electrons from W and Z leptonic decays for the intercalibration of the CMS ECAL single channel response is described. The statistics of 5 fb−1, collected at LHC in 2011 at sqrt(s)=7 TeV, allowed to reach a statistical precision of about 1% in the central part of the ECAL barrel and about 4% in the ECAL endcaps. The results obtained with this method are combined with others, and the impact on the Higgs to di-photon search is shown. Subsequently, the thesis describes the search strategy for the Higgs boson in the H > WW > lvqq final state. The results are based on a data sample corresponding to an integrated luminosity of 17 fb−1 of proton-proton collisions accumulated during the 2011-2012 LHC run. The standard model Higgs boson is excluded at 95% confidence level in the mass ranges [215 − 490] + [525 − 600] GeV.
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Strebler, Thomas. "Probing the Higgs coupling to the top quark at the LHC in the CMS experiment." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX044/document.

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Cette thèse présente une étude de la production associée du boson de Higgs en association avec des quarks tops, suivie d’une désintégration du boson de Higgs en leptons tau, dans des collisions proton-proton (pp) à une énergie dans le centre de masse de sqrt(s) = 13 TeV enregistrées avec le détecteur CMS au Grand collisionneur de hadrons (LHC) du CERN.Ce travail s’inscrit dans le contexte du Run 2 du LHC, marqué par une augmentation de l’énergie dans le centre de masse de 8 à 13 TeV accompagnée d’une augmentation de la luminosité instantanée des collisions par rapport au Run 1. Pour faire face à ces nouvelles conditions de prise de données, CMS a entrepris une amélioration complète du système de déclenchement de niveau 1 accomplie avant 2016. Ce nouveau système et en particulier le nouvel algorithme électron et photon de niveau 1 ont contribué avec succès à un grand nombre de résultats CMS basés sur les données du Run 2. La mise en service de ce nouveau système ainsi que ces performances mesurées dans les premières données collectées par ce nouveau système de déclenchement sont présentées en détails.Une technique d’analyse novatrice basée sur la Méthode des Éléments de Matrice optimisée pour la recherche du processus ttH, H->tautau est également présentée, ainsi que plusieurs outils génériques pouvant âtre utilisés dans une large variété d’analyses H->tautau. Les résultats de l’analyse CMS utilisant cette méthode basés sur 35.9 fb-1 collectés en 2016 sont présentés. L’hypothèse "bruit de fond seul" est défavorisée mais n’est pas encore exclue par cette analyse à elle seule
This thesis reports a study of the Higgs boson production in association with top quarks and decaying into τ leptons in proton-proton (pp) collisions at a center-of-mass energy of sqrt(s) = 13 TeV recorded with the CMS detector at the CERN Large Hadron Collider (LHC).This work has been carried out in the context of the Run 2 of the LHC, marked by an increase in the center-of-mass energy from 8 to 13 TeV together with an increase in the instantaneous luminosity of the collisions with respect to Run 1. To cope with this new data-taking conditions, CMS had initiated a full upgrade of the Level-1 trigger system achieved by 2016. This new system and in particular the new Level-1 electron and photon algorithm have successfully contributed to a large number of CMS results using Run 2 data. The commissioning of this new system and its performance measured with the first data collected with this new trigger are presented in details.A novel analysis technique based on the Matrix Element Method optimized for the search of the ttH, H->tautau process is also presented, including several generic tools which can be used in a large variety of H->tautau analyses. Results of the CMS analysis using this method based on 35.9 fb-1 collected in 2016 are presented. The background-only hypothesis is disfavored but not yet excluded by this analysis alone
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Atteryd, Katarina. "Investigation of the WW excess observed by ATLAS and CMS at the LHC." Thesis, KTH, Fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-174064.

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Bartsch, Valeria. "Simulation von Siliziumdetektoren und Studie des Higgs Zerfalls H ZZ 4u für CMS (LHC) = Simulation of silicon sensors and study of the Higgs decay H ZZ 4u for CMS (LHC) /." [S.l. : s.n.], 2003. http://swbplus.bsz-bw.de/bsz109022173abs.htm.

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Broutin, Clémentine. "Electron Measurements and Search for Higgs Bosons in Multi-Lepton Channels with the CMS Experiment at LHC." Palaiseau, Ecole polytechnique, 2011. http://pastel.archives-ouvertes.fr/docs/00/61/75/14/PDF/these_cbroutin2.pdf.

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Cette thèse présente le travail de trois ans effectué dans l'expérience CMS, dans le contexte des premières collisions du LHC. L'étude porte en particulier sur les électrons, objets essentiels pour les analyses de recherche en canaux multi-leptons, notamment l'analyse H → ZZ(∗) → 4ℓ. Durant les premiers mois de collisions, nous avons pris part à la validation des données enregistrées par le calorimètre électromagnétique. Nous avons mesuré l'efficacité du système de déclenchement de niveau 1 en électrons et photons tout au long de l'année 2010. L'efficacité sur le plateau est de 99. 6 % (resp. 98. 5 %) pour des électrons dans le tonneau (resp. Dans les bouchons) du calorimètre. En vue d'optimiser le potentiel de découverte, nous avons mis au point un nouvel algorithme de mesure de la charge des électrons. Dans CMS, celle-ci est affectée par la grande quantité de matière présente dans le trajectographe. Les performances de cet algorithme ont été mesurées sur les données enregistrées en 2010, sur des électrons issus de désintégrations de bosons Z, passant une sélection standard. La probabilité d'erreur est de 1. 06 % (0. 19 % après une sélection spécifique), en accord avec la simulation. L'analyse de physique effectuée dans cette thèse porte sur la recherche de bosons de Higgs doublement chargés, dans leurs désintégrations en paires de leptons. Avec les données enregistrées en 2010, un événement de bruit de fond est attendu à la fin de la sélection, pour un nombre d'événements de signal qui dépend de l'hypothèse de masse et du modèle considéré. Un événement est observé dans les données, en accord avec le bruit de fond attendu, ce qui permet d'exclure ce signal sur des domaines de masse plus larges que précédemment : la limite varie de 122 GeV à 176 GeV en fonction du modèle
This thesis presents three years of work with the CMS experiment, in the context of the first LHC collisions. Electron objects were studied in particular, as major tools for multi-lepton analyses, in particular the H → ZZ(∗) → 4ℓ analysis. During the first months of collisions, we took part in the validation of data registered by the electromagnetic calorimeter. We also measured the efficiency of the level-1 electron and photon trigger during the whole 2010 year. The plateau efficiency is of 99. 6 % (resp. 98. 5 %) on electrons in the barrel part (resp. In the endcap part) of the calorimeter. In order to optimize the discovery potential, we built a new electron charge measurement algorithm. In CMS, this measurement is affected by the large amount of material present in the inner tracker. The performance of this algorithm was measured on 2010 data, for electrons from Z boson decay passing a standard selection. The probability of charge mis-identification is of 1. 06 % (0. 19 % with a specific selection), in agreement with the simulation. The physics analysis that was built during this PhD searches doubly charged Higgs bosons decaying into lepton pairs. For the amount of data registered in 2010, one background event is expected to pass the selection, while the amount of signal events depends on the mass hypothesis and on the model. One event was found on data, in agreement with the background expectation, hence the signal was excluded on larger mass ranges than previous experiments: a mass limit was set between 122 GeV and 176 GeV, depending on the model
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Books on the topic "LHC, CMS, Higgs, WW"

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Martin Perez, Cristina. Search for the Higgs Boson Produced in Association with Top Quarks with the CMS Detector at the LHC. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-90206-3.

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Perez, Cristina Martin. Search for the Higgs Boson Produced in Association with Top Quarks with the CMS Detector at the LHC. Springer International Publishing AG, 2022.

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Cadamuro, Luca. Search for Higgs Boson Pair Production in the bb̅ τ+ τ- Decay Channel: With the CMS detector at the LHC. Springer, 2018.

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Book chapters on the topic "LHC, CMS, Higgs, WW"

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Petrucciani, Giovanni. "The CMS experiment at the CERN LHC." In The Search for the Higgs Boson at CMS, 15–58. Pisa: Scuola Normale Superiore, 2013. http://dx.doi.org/10.1007/978-88-7642-482-3_2.

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Jenni, Peter, and Tejinder S. Virdee. "The Discovery of the Higgs Boson at the LHC." In Particle Physics Reference Library, 263–309. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38207-0_6.

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AbstractIn July 2012 the ATLAS and CMS experiments announced the discovery of a Higgs boson, confirming the conjecture put forward in the 1960’s. This article briefly traces the history of the Brout-Englert-Higgs mechanism, its impact on the elucidation of the standard model, the design and construction of the ATLAS and CMS experiments, and finally the discovery of the Higgs boson. The article outlines some of the challenges faced during the construction of the Large Hadron Collider and its experiments, and their operation and performance. In particular, recent results relating to the properties and couplings of the Higgs boson will be discussed as well future prospects at the LHC.
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Mehta, Ankita. "Higgs Searches via WW Decay Channel Using the CMS Detector." In XXII DAE High Energy Physics Symposium, 167–70. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73171-1_37.

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Petrucciani, Giovanni. "Search for a Higgs boson in the H → WW → 2ℓ2ν channel." In The Search for the Higgs Boson at CMS, 59–94. Pisa: Scuola Normale Superiore, 2013. http://dx.doi.org/10.1007/978-88-7642-482-3_3.

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Petrucciani, Giovanni. "Searches for a heavy Higgs boson decaying into WW, ZZ in final states with hadronic jets and neutrinos." In The Search for the Higgs Boson at CMS, 147–63. Pisa: Scuola Normale Superiore, 2013. http://dx.doi.org/10.1007/978-88-7642-482-3_7.

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Purohit, Arnab. "Re-discovery of the SM Higgs Boson in Diphoton Channel at $$\sqrt{s} =$$ 13 TeV at CMS in LHC." In XXII DAE High Energy Physics Symposium, 69–72. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73171-1_14.

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Carvalho, Alexandra, Jyothsna Rani Komaragiri, Devdatta Majumder, and Lata Panwar. "Search for Vector Boson Fusion Production of a Massive Resonance Decaying to a Pair of Higgs Bosons in the Four b-Quark Final State at the HL-LHC Using the CMS Phase-2 Detector." In Springer Proceedings in Physics, 221–25. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4408-2_31.

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Virdee, Tejinder Singh. "The Long Journey to the Higgs Boson and Beyond at the LHC Part I: Emphasis on CMS." In Memorial Volume on Abdus Salam's 90th Birthday, 357–86. WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813144873_0020.

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Gross, Alan G. "Lisa Randall: The Technological Sublime." In The Scientific Sublime. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190637774.003.0008.

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In 2008 a rap video by Kate McAlpine went viral (nearly eight million views at present). Not your typical rap video, it takes place in the tunnel of the Large Hadron Collider and on the grounds 100 feet above. During the performance, the computer-generated voice of Stephen Hawking chimes in as part of a periodic call and response. Throughout, the lyrics are replete with technical terms like “protons,” “lead ions,” “antimatter,” “black holes,” “dark matter,” “Higgs boson,” “Standard Model,” “graviton,” “top quark,” and acronyms like “ALICE,” “ATLAS,” and “CMS.” Here is the central refrain: . . . The LHC accelerates the protons and the lead And the things that it discovers will rock you in the head. The Higgs boson, that’s the one that everybody talks about And it’s the one sure thing that this machine will sort out. . . . McAlpine’s was a prophesy that proved right on target. In 2016, François Englert and Peter Higgs won the Nobel Prize in physics for a conjecture they had made over a half century earlier, a mathematically driven leap of faith that became a scientific fact when the Higgs boson was detected—a hitherto mysterious but absolutely central member of the particle zoo. It was a discovery that confirmed the otherwise highly confirmed Standard Model, the explanatory centerpiece of the quantum world. At five billion dollars, the detector of the Higgs, the Large Hadron Collider, is the most expensive scientific apparatus ever built. It is a Mount Everest of machines, the apotheosis of the technological sublime. This form of sublimity is near the center of Lisa Randall’s professional life, the only means by which her deepest conjectures about the universe can be demonstrated. Hers is a flight into the scientific stratosphere tethered to events that she hopes will be observed by two incarnations of the technological sublime: the Large Hadron Collider or the GAIA satellite. When the UK funding for the Large Hadron Collider was still in question, Science Minister William Waldegrave challenged British physicists, telling them “that if anyone could explain what all the fuss was about, in plain English, on one sheet of paper, then he would reward that person with a bottle of vintage champagne.”
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Conference papers on the topic "LHC, CMS, Higgs, WW"

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BIGLIETTI, Michela, and Pietro Govoni. "Higgs \rightarrow WW." In VI Italian workshop on p-p physics at the LHC. Trieste, Italy: Sissa Medialab, 2013. http://dx.doi.org/10.22323/1.188.0004.

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Di Croce, Davide. "Higgs to WW measurements with CMS." In European Physical Society Conference on High Energy Physics. Trieste, Italy: Sissa Medialab, 2020. http://dx.doi.org/10.22323/1.364.0364.

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Kalinowski, A. "Higgs search by CMS." In LHC on the March. Trieste, Italy: Sissa Medialab, 2012. http://dx.doi.org/10.22323/1.168.0023.

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Korytov, Andrey, Pyungwon Ko, and Deog Ki Hong. "Higgs Boson Search at LHC (and LHC∕CMS status)." In SUPERSYMMETRY AND THE UNIFICATION OF FUNDAMENTAL INTERACTIONS. AIP, 2008. http://dx.doi.org/10.1063/1.3051894.

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Kirsanov, Mikhail. "SM Higgs searches by CMS at the LHC." In LHC on the March. Trieste, Italy: Sissa Medialab, 2013. http://dx.doi.org/10.22323/1.186.0038.

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Lloret Iglesias, Lara. "Search for SM Higgs decaying to WW and WW production cross section measurement at CMS." In 36th International Conference on High Energy Physics. Trieste, Italy: Sissa Medialab, 2013. http://dx.doi.org/10.22323/1.174.0055.

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HASHEMI, Majid. "- Higgs search in H\rightarrow WW channel with the CMS detector." In XXth Hadron Collider Physics Symposium. Trieste, Italy: Sissa Medialab, 2010. http://dx.doi.org/10.22323/1.102.0077.

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De Wit, Adinda. "Higgs measurements at the HL-LHC with CMS." In The European Physical Society Conference on High Energy Physics. Trieste, Italy: Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.314.0274.

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PRIMAVERA, Federica. "Search for MSSM Higgs with the CMS detector at LHC." In LHC on the March. Trieste, Italy: Sissa Medialab, 2013. http://dx.doi.org/10.22323/1.186.0035.

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JORDA, Clara. "Higgs search in H\rightarrow WW decay channels with the CMS detector." In European Physical Society Europhysics Conference on High Energy Physics. Trieste, Italy: Sissa Medialab, 2010. http://dx.doi.org/10.22323/1.084.0437.

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