Download or read book Measurement of the Higgs Boson Tensor Coupling in H ZZ 4l Decays with the ATLAS Detector written by Katharina Maria Ecker and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Higgs Boson Tensor Coupling in H ZZ 4l Decays with the ATLAS Detector written by Katharina Maria Ecker and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Precision Coupling Measurements of the Higgs Boson Using the H ZZ 4l Decay Channel written by Syed Haider Abidi and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The coupling of the Higgs boson to other particles is probed by measuring the production cross sections at the Large Hadron Collider using the ATLAS detector. The present measurement is performed using the H->ZZ*->4l decay channel, with l= electron or muon and with datasets corresponding to various integrated luminosities. The inclusive production cross section is measured to be 1.34 +/- 0.12 pb, which is in good agreement with the predicted value of 1.33 +/- 0.08 pb. The gluon-gluon fusion, the vector boson fusion, the vector boson associated and the top associated production cross sections are measured to be 1.12 +/- 0.12 pb, 110 +/- 40 fb, 75 +61 -49 fb and 27 +26 -17 fb, respectively. The differential production cross sections are also measured using the Simplified Template cross sections framework. All measurements are in good agreement with the Standard Model predictions. These results are used to measure the Higgs boson coupling to fermions and vector bosons using the kappa-framework and to derive constraints on contributions from beyond the Standard Model physics using an effective field theory approach. No significant deviations from the Standard Model are observed.

Download or read book Measurements of Higgs Boson Production and Couplings in the Four lepton Channel in pp Collisions at Center of mass Energies of 7 and 8 TeV with the ATLAS Detector written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Mass of the Higgs Boson in the H ZZ 4l Channel at the ATLAS Detector written by Thomas Powell and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of the Spin and Parity of the Higgs Boson in Diboson Decays with the ATLAS Detector written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies of the spin, parity and tensor couplings of the Higgs boson in the H→ZZ*→4l, H→WW*→e[nu][mu][nu] and H→[gamma][gamma] decay processes at the LHC are presented. The investigations are based on 25fb-1 of pp collision data collected by the ATLAS experiment at √s=7 TeV and √s=8 TeV. The Standard Model (SM) Higgs boson hypothesis, corresponding to the quantum numbers JP=0+, is tested against several alternative spin scenarios, including non-SM spin-0 and spin-2 models with universal and non-universal couplings to fermions and vector bosons. All tested alternative models are excluded in favour of the SM Higgs boson hypothesis at more than 99.9 % confidence level. Using the H→ZZ*→4l and H→WW*→e[nu][mu][nu] decays, the tensor structure of the interaction between the spin-0 boson and the SM vector bosons is also investigated. The observed distributions of variables sensitive to the non SM tensor couplings are compatible with the SM predictions and constraints on the non SM couplings are derived.

Download or read book ATLAS Measurements of the Higgs Boson Coupling to the Top Quark in the Higgs to Diphoton Decay Channel written by Jennet Elizabeth Dickinson and published by Springer Nature. This book was released on 2021-11-16 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: During Run 2 of the Large Hadron Collider, the ATLAS experiment recorded proton-proton collision events at 13 TeV, the highest energy ever achieved in a collider. Analysis of this dataset has provided new opportunities for precision measurements of the Higgs boson, including its interaction with the top quark. The Higgs-top coupling can be directly probed through the production of a Higgs boson in association with a top-antitop quark pair (ttH). The Higgs to diphoton decay channel is among the most sensitive for ttH measurements due to the excellent diphoton mass resolution of the ATLAS detector and the clean signature of this decay. Event selection criteria were developed using novel Machine Learning techniques to target ttH events, yielding a precise measurement of the ttH cross section in the diphoton channel and a 6.3 $\sigma$ observation of the ttH process in combination with other decay channels, as well as stringent limits on CP violation in the Higgs-top coupling.

Download or read book Measurement of the Higgs boson Coupling to Tau leptons and Combined Measurements of Higgs boson Properties at Sqrt s written by Théo Megy and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The measurement of the Higgs-boson coupling to tau-leptons, based on an integrated luminosity of 36.1 ifb recorded at a centre-of-mass energy of 13 TeV by the ATLAS detector, is presented in this thesis. The analysis considers all combinations of leptonic and hadronic decays of tau-leptons, and targets the main two production modes of the Higgs boson, gluon Fusion and Vector-Boson Fusion. The inclusive cross section of the H->tautau decay channel is measured as 3.77 +1.06-0.95 (+0.60-0.59 (Stat.) +0.87-0.74 (Syst.)) pb, which corresponds to a deviation from the background-only hypothesis with an observed (expected) significance of 4.4 (4.1) standard deviations. In addition, the measurement of cross sections in the framework of Simplified Template Cross Sections is discussed. All measurement are in agreement with predictions of the Standard Model. The combined measurement of Higgs-boson properties is also presented, based on up to 79.8 ifb of data recorded at sqrt(s) = 13 TeV by the ATLAS detector. An observation of the four main production modes (ggF, VBF, VH and ttH+tH) and of four of the five main decay channels (H->gammagamma, H->ZZ, H->WW and H->bb) of the Higgs boson is achieved. In particular, the deviation from the background-only hypothesis with an observed (expected) significance of 6.5 (5.3) standard deviations for the VBF production mode is the first observation of this process by a single experiment. Measurements in the scope of the kappa-framework and of Simplified Template Cross Sections are also discussed. All the performed measurements are compatible with the Standard-Model expectations

Download or read book Measurement of the Brout Englert Higgs Boson Couplings in Its Diphoton Decay Channel with the ATLAS Detector at the LHC written by Estelle Scifo and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: After the Higgs boson discovery in the first LHC data, the focus is now on its properties measurement. Among these properties, its couplings are of particular importance since any deviation from the expected value can be an indication of new physics, beyond the Standard Model. This thesis is oriented towards the Higgs couplings measurements with the ATLAS experiment, using the diphoton decay channel. Selected diphoton events are classified into different categories to disentangle the five Higgs production modes by tagging the objects produced in association with the Higgs boson: two jets for the VBF production mode, lepton and missing transverse energy for the higgsstrahlung (WH and ZH), b-jets for ttH, the remaining events being mostly produced via the dominant production mode ggH. The impact of the Higgs pT modelling in the ggH production mode is also investigated. Theoretical developments provide predictions of the pT shape at NNLO+NNLL accuracy, including top and bottom mass effects in the loop up to NLO+NLL, implemented in the HRes program. A reweighting technique to take into account these latest theoretical improvements is derived, taking into consideration the correlation with the number of jets. Its impact on the final measurement is estimated to be of the order of a few percent. The final couplings results, measured at the Higgs mass obtained by the combination of the H->gamma gamma and H->ZZ*->4l channels in ATLAS (mH = 125.4 +/- 0.4 GeV) do not show any statistically significant deviation from the Standard Model. The observed signal strength mu = sigma^{obs} / sigma^{exp} is found to be: mu = 1.17^{+0.28}_{-0.25} = 1.17 +/- 0.23(stat) ^{+0.10}_{-0.08}(syst) ^{+0.12}_{-0.08}(theory). The ratio of the observed number of events in each production mode to the expected ones are measured at: mu_ggH = 1.32 +/- 0.32(stat.) ^{+0.13}_{-0.09}(syst.) ^{+0.19}_{-0.11}(theory) ; mu_VBF = 0.8 +/- 0.7(stat.) ^{+0.2}_{-0.1}(syst.) ^{+0.2}_{-0.3}(theory) ; mu_WH = 1.0 +/- 1.5(stat.) ^{+0.3}_{-0.1}(syst.) ^{+0.2}_{-0.1}(theory) ; mu_ZH = 0.1 ^{+3.6}_{-0.1}(stat.) ^{+0.7}_{-0.0}(syst.) ^{+0.1}_{-0.0}(theory) ; mu_ttH = 1.6 ^{+2.6}_{-1.8}(stat.) ^{+0.6}_{-0.4}(syst.} ^{+0.5}_{-0.2}(theory).

Download or read book Studies of the Higgs Boson Using the H ZZ 4l Decay Channel with the ATLAS Detector at the LHC written by Francisca Montserrat Garay and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of the Higgs Boson Decay H ZZ 4l and Inner Detector Performance Studies with the ATLAS Experiment written by Karoline Elfriede Selbach and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Discovery and Measurement of the Higgs Boson in the WW Decay Channel written by David Hall and published by Springer. This book was released on 2015-06-15 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes the stand-alone discovery and measurement of the Higgs boson in its decays to two W bosons using the Run-I ATLAS dataset. This is the most precise measurement of gluon-fusion Higgs boson production and is among the most significant results attained at the LHC. The thesis provides an exceptionally clear exposition on a complicated analysis performed by a large team of researchers. Aspects of the analysis performed by the author are explained in detail; these include new methods for evaluating uncertainties on the jet binning used in the analysis and for estimating the background due to associated production of a W boson and an off-shell photon. The thesis also describes a measurement of the WW cross section, an essential background to Higgs boson production. The primary motivation of the LHC was to prove or disprove the existence of the Higgs boson. In 2012, CERN announced this discovery and the resultant ATLAS publication contained three decay channels: gg, ZZ, and WW.

Download or read book Measurement of the Higgs Boson Coupling Structure in Decays to Four Leptons with the ATLAS Detector written by Verena Maria Walbrecht and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Higgs Boson Off shell Coupling to Constrain the Total Width in the H ZZ 4l Channel and Level 1 Track Muon Isolation Performance for the HL LHC with the ATLAS Detector written by Sebastian Andres Olivares and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Higgs Boson in the HZZ 4l Decay Channel with the ATLAS Detector at the LHC written by Antonio Salvucci and published by . This book was released on 2014 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Properties of the Standard Model Higgs Boson in the H ZZ 4l Decay Channel with the ATLAS Experiment at CERN written by Eleonora Benhar Noccioli and published by . This book was released on 2015 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fiducial I Inclusive and Differential Cross Section Measurements of the Higgs Boson in the H ZZ 4l Channel with the ATLAS Detector written by Laurelle Maria Veloce and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: